system
With the continuous development of cognitive radio networks (CRNs), people have gradually deepened their understanding of its development direction. At present, the development directions of cognitive radio technology mainly focus on the following aspects (see Figure 2 ).
Development directions of CR networks.
With the emergence of the 5G era, conventional wireless communication technologies are no longer adequate to meet future demands. Cognitive network technology is increasingly gaining traction as a dominant force in the future development trend. As an emerging network communication technology, cognitive networks will have a significant impact on the future of communication. The development direction of cognitive radio in the context of 5G communication systems is focused on achieving higher data transmission rates, better coverage, and more flexible and diverse communication modes [ 27 ].
The use of multichannel operations in wireless access for vehicular environments (WAVE) has been proposed in the IEEE 1609.4 standard. The WAVE system employs the 75 MHz spectrum in the 5.9 GHz band, with one control channel and six service channels. However, there is still a scarcity of spectrum which poses a challenge for the WAVE system. The application of cognitive radio technology in WAVE has been studied to address this problem [ 28 , 29 , 30 ]. Some initial work on cognitive radio-enabled vehicular communications has already been conducted. Vehicular wireless sensor networks are becoming a popular network paradigm for collecting monitoring information in urban environments. In this field, CRNs are likely to play a significant role, and protocols for highway safety using CRNs have already been proposed [ 31 , 32 ], although more research is needed in this area.
Delivering multimedia applications, such as on-demand or live video streaming, audio, and still images, over resource-constrained CRNs is a significant challenge due to their high bandwidth requirements. Refs. [ 33 , 34 , 35 ] further discuss the advantages of CRNs in these high-throughput application scenarios. Similarly, other CRN applications, including those used in hospitals, vehicular networks, tracking, and surveillance, have varying data densities and require significant bandwidth, low delay, and high bursts of data. However, because SUs in CRNs can access multiple channels whenever necessary and available, CRNs are well suited for bandwidth-intensive applications.
A wide range of indoor applications, such as intelligent buildings, home monitoring systems, factory automation, and personal entertainment, require a dense CRN environment to ensure an adequate Quality of Service (QoS). However, conventional CRNs face significant challenges in achieving reliable communication in indoor areas due to the extremely crowded industrial, scientific, and medical (ISM) bands [ 36 ]. To overcome these challenges, CRNs offer a promising solution. By using cognitive radio technology, CRNs can mitigate the limitations of traditional indoor CRN applications, thereby improving their efficiency and effectiveness.
Immediate monitoring applications, such as traffic monitoring, biodiversity mapping, habitat monitoring, environmental monitoring, crop and livestock monitoring, irrigation, underwater CRNs, vehicle and inventory tracking, disaster relief operations, as well as bridge and tunnel monitoring require reliable and low-latency communication with minimum channel access. For some real-time surveillance applications, even a small delay can be critical, and they therefore require high reliability. However, in multihop CRNs, a delay can occur due to link failure if the channel condition is poor. In contrast, CR nodes can switch to another channel with a better condition if they find one. To increase the channel bandwidth, CRNs can use channel aggregation and multiple channels concurrently, which can be beneficial for real-time surveillance applications [ 37 , 38 ].
Conventional cognitive radio networks find application in numerous military and public security scenarios. Some of these applications include chemical, biological, radiological, and nuclear (CBRN) attack detection and investigation, command and control operations, gathering information for battle damage evaluation, battlefield surveillance, intelligence assistance, targeting, and more. In hostile regions, adversaries may employ jamming signals to interfere with radio communication channels. In such situations, CRNs can switch to different frequency bands to avoid the band with the jamming signal. Furthermore, certain military applications require large bandwidths, minimal channel access, and low communication delays, making CRNs an optimal choice for these purposes.
Authors have achieved some research results in cognitive wireless networks and cognitive vehicular networks [ 39 , 40 ]. There are also some novel research directions in applying cognitive radio networks in civil aviation such as air–ground communication, cognitive radar, etc.
In general, the future development direction of cognitive radio technology is mainly to achieve more efficient communication and integration with other communication technologies.
The future development direction of cognitive radio mainly includes the following aspects:
Firstly, incorporating artificial intelligence (AI) technology into cognitive radio enables signal adaptation, autonomous sensing, and intelligent modulation, leading to enhanced system performance. Furthermore, integrating predictive, analytical, and reasoning capabilities into the cognitive radio system can augment its intelligence and efficiency.
Secondly, high-speed transmission is crucial. With the introduction and continuous upgrading of various new wireless technologies, the demand for higher transmission rates has surged. Consequently, cognitive radio technology must enable faster data transmission rates while ensuring data accuracy and reliability [ 41 ].
Thirdly, security is a crucial consideration in cognitive radio systems as the number of wireless devices increases. To ensure the stability and reliability of the system, more attention and research are required to strengthen the security protection of cognitive radio systems in the future.
Cognitive radio refers to the use of radio technology to obtain, process, and interpret the information transmitted and processed by electronic equipment and communication systems.
The challenges faced by cognitive radio are as follows:
The limitation of the cognitive radio frequency range is that human cognition and perception are limited by the radio frequency range. In modern communication technology, the use of radio frequencies has become an unavoidable problem, and these frequency ranges have a profound impact on human perception and cognition.
The frequency spectrum of radio waves has a wide range from 3 kHz to 300 GHz, which includes many frequencies required by modern communication technologies, such as Wi-Fi, Bluetooth, mobile data, satellite communication, etc. However, these frequencies impose some limitations on human perception and cognition [ 42 , 43 ].
Firstly, the frequency of radio waves may result in different frequency ranges received by devices exposed to radio waves, which may affect their perception and cognition. For example, the frequency range of Wi-Fi radio waves is between 2.4 GHz and 2.45 GHz, but different Wi-Fi devices may have different frequency ranges, which may lead to different wireless access points (APs) connecting to the network, thereby affecting the perception and cognition of the devices.
Secondly, the frequency of radio waves may also affect the perception and cognition of the eyes and brain. The shorter the wavelength of a radio wave, the better its penetration ability. This means that high-frequency radio waves can penetrate fog and obstacles, while shortwave radio waves are more easily received by radar antennas. However, the wavelength of high-frequency radio waves is relatively short, so the human eye’s perception and cognition of shortwave radio waves may be affected, which may lead to high-frequency radio wave devices being considered ineffective.
Finally, the frequency of radio waves may also affect human cognition and culture. In some cultures, radio waves are considered an important cultural element, such as the radio and television frequency bands in China and some radio frequency bands in other countries, such as the 1.1 GHz and 1.8 GHz frequency bands in the UK, which are considered to have cultural significance. The use of these frequency bands may affect people’s cognition and culture.
Therefore, as human cognition and perception ability are limited by the radio frequency range and different radio frequencies may affect human perception and cognition, so different frequency ranges are required.
Cognitive radio technology, also known as cognitive communication, is a cross field research area involving radio technology and artificial intelligence technology. The development and widespread application of this technology have led to a deeper understanding of communication and computing methods, while also increasing the complexity of radio technology. The development of cognitive radio technology is inseparable from the support of artificial intelligence technology. The application of artificial intelligence technology makes the training of algorithms, data structures, and models more efficient, and also makes the process of machine learning applied to cognitive radio more complex [ 44 , 45 ].
There are papers and patents involving the applications of CR technology in different fields. For example, Ref. [ 46 ] proposed a dual-user relay protocol based on energy harvesting and cognitive radio technology, which achieved energy efficiency via relay communication. Ref. [ 47 ] compared the application potential and performance differences in different CR technologies in the FM broadcast frequency band. Ref. [ 48 ] proposed a novel channel allocation method to improve spectrum utilization efficiency with an OFDM-based CR technology. Ref. [ 49 ] introduced a CR technology utilizing a multiphase downconverter to efficiently receive multiple signals. A research report from Ain Shams University had reported a CR technology utilizing major L-band ranging devices for aviation communication [ 50 ]. These related works provided valuable knowledge and technical solutions for the academic and industrial communities.
The development of cognitive radio has also increased the complexity of radio technology. The development and improvement of radio technology changes with the change in cognitive radio technology. For example, antenna array, modulation mode, demodulation mode, signal power transmission, etc. are closely related to cognitive radio technology [ 51 ].
Finally, cognitive radio technology also needs to identify and understand the signal, which requires compression, quantization, noise removal, reverberation removal, shock removal, and other operations on the signal. These operations require in-depth research and analysis of the signal in order to extract useful information [ 52 ].
To sum up, the development of cognitive radio technology enables people to have a deeper understanding of communication and computing and also increases the complexity of radio technology. The development of cognitive radio technology makes the cross field research between computer and radio technology more complex and efficient [ 53 , 54 , 55 ].
The research of cognitive radio technology needs the cross knowledge of computers, artificial intelligence, radio technology, and other fields. The cross research in these fields not only increases the complexity of technology but also promotes the progress and application of technology [ 56 , 57 ].
In cognitive radio, data storage and processing are very important. Traditional data storage requires a lot of disk space and professional equipment support, which is unrealistic for cognitive radio applications with high real-time requirements. Cognitive radio data storage and processing use efficient algorithms and hardware support, making data storage and processing more efficient [ 58 ].
The high efficiency of cognitive radio data storage is because it uses distributed storage technology to store data on multiple nodes, so as to achieve efficient data storage and processing. Compared with traditional data storage methods, cognitive radio data storage can access and process data faster, while reducing the number and complexity of storage devices [ 59 ].
Cognitive radio data storage also uses adaptive algorithms, which can automatically select suitable storage nodes and storage methods according to the real-time needs, size, and mode of data and other factors. This algorithm can reduce the workload of storage devices and improve their response speed and efficiency [ 60 ].
In conclusion, the efficiency of cognitive radio data storage is the key reason for its wide application in the field of radio communication. By using distributed storage technology, efficient algorithms and hardware support and other technical means, cognitive radio data storage can efficiently store and process data, providing strong technical support for the development and application of cognitive radio communication technology [ 61 , 62 , 63 ].
Cognitive radio is a new radio communication technology, which can use artificial intelligence and machine learning algorithms to design and generate radio signals, so as to achieve extensive radio coverage and low-power wireless sensor networks. In cognitive radio technology, information and data are encoded as radio signals and transmitted through radio waves, which can be received and processed by different devices [ 64 ].
However, the security of cognitive radio also deserves attention. With more and more devices using cognitive radio technology, how to handle and protect the security of these devices becomes particularly important. Among the security issues of cognitive radio, the following are the main issues:
The transmission and reception of cognitive radio signals require low power consumption and short-distance communication, so they are vulnerable to interference and deception. These interferences and deceptions can be caused by the visibility, interference, or deception of other devices, networks, or technologies, as well as specific frequency noise and other interferences. Therefore, when using cognitive radio, it is necessary to ensure that the equipment and network are secure to avoid interference and deception [ 65 , 66 , 67 ].
Cognitive radio devices can receive and transmit data, which may be damaged or tampered with. In order to protect data integrity, data encryption and integrity verification must be implemented. This will ensure that only the correct devices can access and transmit data and prevent data from being tampered with [ 68 , 69 ].
The use of cognitive radio technology involves unknown risks and vulnerabilities, which may pose a threat to the security of equipment. Therefore, it is necessary to test the security of devices and networks and identify and fix vulnerabilities and potential security risks, in order to ensure the security of devices [ 70 ].
At present, cognitive radio technology lacks standardization. This means that devices from different manufacturers may have different safety and functionality, and there is a lack of unified testing and evaluation standards. This may pose a threat to the security and stability of the devices, as well as prevent them from communicating with the network or working properly [ 71 ].
Cognitive radio technology has great potential and broad application prospects, but security issues must be addressed and solved to ensure the safety and correct use of equipment. This includes implementing standardization, testing and verifying the integrity and safety of equipment, as well as developing unified safety standards and testing processes. This will ensure the security of devices and networks and enable a wider range of cognitive radio applications [ 72 , 73 ].
CR standardization is the core issue of the current technical field. Standardization organizations and relevant research units are working closely together to develop unified standards and testing methods to secure the rapidly developing fields of CR technology. In particular, Ref. [ 74 ] pointed out that cognitive radio technology needs to be standardized in multiple aspects, including spectrum management, channel selection, interference detection and management, security, etc. Meanwhile, due to the complexity and diversity of CR technology, the development of standards also should fully consider the differences and special demands of application scenarios.
Cognitive radio is a method of designing, constructing, and testing radio systems using artificial intelligence and machine learning methods. In cognitive radio, the acquisition, processing, and interpretation of signals rely on computer vision and natural language processing technologies. These technologies can enable artificial intelligence systems to recognize, analyze, and interpret human language and signals, so as to better complete the task of cognitive radio [ 75 , 76 ].
Due to the complexity and innovation of cognitive radio systems, standardization is particularly important to ensure that all systems can work in the same environment and meet the needs of users.
At present, the standardization of cognitive radio involves many aspects, such as the layout of radio channels, communication protocols, signal processing algorithms, equipment design, and so on. Although various standardization organizations have already carried out some work, there are still many challenges, such as: different standardization organizations may have different standard definitions, standard testing methods, standard implementation methods, etc., which may lead to inconsistencies between different systems. In addition, the research and development of cognitive radio need a lot of resources, and the workload of standardization organizations will increase accordingly, so more cooperation and support are needed [ 77 ].
Standardization organizations and relevant research units need to work closely together to develop unified standards and test methods to ensure that all systems can work in the same environment, meet user needs, and promote the development of cognitive radio technology. It is also necessary to strengthen relevant research results and experimental work to better guide the practice of standardization work. Only in this way can we truly realize the popularization and development of cognitive radio technology and create more communication and cognitive capabilities for humankind [ 78 , 79 ].
Cognitive radio is a new technology, which involves the conversion of radio signals into cognitive signals so that computers and humans can recognize and understand these signals. This technology has applications in multiple fields, such as medical, military, transportation, and communication. The problem of environmental adaptability of cognitive radio refers to how humans recognize and interpret radio signals in the environment [ 80 ].
Cognitive radio technology requires powerful computers and complex algorithms to analyze and understand radio signals. These computers require sufficient memory to process a large amount of data and high-speed memory to store the parsing results. Algorithms also require strong computing power to process large amounts of data in order to convert complex radio signals into cognitive signals [ 81 ].
The problem of environmental adaptability of cognitive radio is related to human cognitive processes, and it needs to consider how the human brain processes information. When analyzing radio signals, it is necessary to consider factors such as frequency, strength, and phase of the radio signal in order to convert this information into cognitive information. It is necessary to consider how different human brains process information differences in order to achieve consistency in analytical results among different individuals [ 82 ].
The environmental adaptability of cognitive radio needs to consider complex radio signals, which requires strong computing power of analytical algorithms and powerful processing power of computers to process large amounts of data. Humans need to adapt to different radio signals in the cognitive radio environment in order to convert this information into cognitive information and different signal sources are needed in the environment so that different people have different results of analytic signals [ 83 ].
The environmental adaptability of cognitive radio needs to consider how the human brain processes information, and different signal sources and resolution algorithms are needed to achieve consistency of resolution results between different human individuals and switch signal sources in different environments [ 84 ].
In a word, cognitive radio’s environmental adaptability needs to consider complex radio signals, requires humans to adapt to different radio signal sources and resolution algorithms, and requires switching signal sources in different environments. The application of this technology will bring many changes to humanity, including applications in medical, military, transportation, and communication fields, while also bringing more efficient communication and more accurate diagnosis and treatment to humanity [ 85 ].
7.1. applications in civil aviation.
In civil aviation, with proper definition and working principles, CR technology can be applied to monitor and manage radio signals, ensuring the safety of communication and flight operations [ 86 ].
The increase in air traffic leads to the increasing use of radio spectrum for aeronautical communications in civil aviation, which is expected to be more and more congested. Considering the advantages of cognitive radio in resource-constrained situations, researchers have begun to discuss the applications of cognitive radio in civil aviation such as air–ground communication, air–air communication, unmanned aerial systems, etc. [ 87 ]. Furthermore, cognitive radio technology, along with other radio technologies, can be widely used in the following aspects in Figure 3 .
Application scenarios of CR in civil aviation.
The application of CR in civil aviation communication systems refers to the use of new radio technologies and equipment to make it easier and safer for passengers and crew to use communication equipment, including mobile phones, laptops, e-books, etc. In the civil aviation communication system, the application of CR can make flight communication more efficient, safe, and reliable [ 88 ].
With the continuous development of modern communication technology, people’s understanding of radio is also constantly improving. Radio technology plays an increasingly important role in modern communication, with applications including radio beacons, radio measurements, radio reception and transmission, satellite communication, and more. CR technology is based on the improvement of people’s radio awareness and, through the use of new radio technology and equipment, passengers and crew can use communication equipment more easily and safely, including mobile phones, laptops, e-books, etc. [ 89 ].
In civil aviation communication systems, the application of CR can improve communication efficiency and security. The flight communication system needs to handle different types and quantities of communication devices, such as mobile phones, laptops, e-books, etc. CR can make these devices easier to manage and recognize, while providing better security [ 90 ].
Airport wireless beacons are an important component of airport communication systems. They are used for transmitting and receiving wireless network signals, making it easier for passengers and crew members to connect to the airport wireless network and access various applications and resources during flights. CR can replace traditional radio beacons because it uses higher-frequency radio waves, making it easier to connect to wireless networks while providing better signal-to-noise ratio and stability. A radio direction finding system is a type of radio equipment that uses radio waves of a specific frequency to detect and locate radio equipment. In civil aviation communication systems, CR can replace traditional radio direction finding systems by using high-frequency radio waves to detect and locate various communication devices. CR can better detect and locate handheld radio devices, including mobile phones and other communication devices. The airport wireless communication system is an important component of the flight communication system. CR can be used to connect airport wireless communication systems, making it easier for passengers and crew to access flight communication systems, such as flight information, entertainment systems, and flight communication beacons. CR can also provide safer and more efficient communication, enabling passengers and crew members to more effectively access information and maintain flight communication systems [ 91 , 92 ].
The application of CR in civil aviation communication system is an important part of airport communication system and flight communication systems. CR can make it easier and safer for passengers and crew to use communication equipment, improving the efficiency and safety of airport communication systems and flight communication systems [ 93 ].
Cognitive radio is a new type of radio technology. Different from traditional analog signal radio, cognitive radio uses digital signal technology for communication, which can automatically identify and adapt to different communication needs, including voice communication, data communication, and video communication, and can communicate in different wireless communication systems, such as satellite communication, mobile communication, and terrestrial radio communication.
In the field of civil aviation, cognitive radio technology is widely used to ensure the safety and smoothness of flights. The radio systems of civil aviation airports and airlines are usually maintained and upgraded by professional radio engineers who need to be trained and certified in cognitive radio technology in order to master the latest technologies and tools and ensure the reliability and safety of the radio system [ 92 ].
Cognitive radio technology is applied to flight communication, including voice communication, data communication, and video communication. For example, on a flight, communication between the captain and passengers usually uses satellite phones for real-time communication. Since the aircraft will generate noise in flight, the captain’s voice will be interfered with by the noise. Therefore, the captain needs to use cognitive radio technology to record and confirm the call to ensure the quality and safety of the call.
The radio system at the airport is used to monitor the status, flight speed, and dangerous situations encountered by the aircraft, such as the fuel condition, attitude, and altitude of the aircraft. The airport radio system also needs to use cognitive radio technology for monitoring and communication, so that flight and airport management personnel can understand the flight situation in real time.
The application of cognitive radio technology in the radio systems of civil aviation and airports can improve the reliability and security of communication, ensure the safety and smoothness of flights, and ensure the safety and interests of passengers and airport managers.
Cognitive radio is a radio communication technology based on machine learning and cognitive computing. Its goal is to optimize and improve the radio communication system by making use of human cognitive and language abilities to enable radio devices to automatically recognize and receive signals. The application of cognitive radio technology in civil aviation navigation can bring the following advantages:
Traditional GPS navigation uses satellite signals, which are influenced by factors such as the Earth’s curvature and satellite signal attenuation, resulting in navigation errors. Cognitive radio technology uses cognitive computing and machine learning algorithms to identify and correct satellite signals in real time and improve navigation accuracy.
Wireless channels are an important part of communication systems, but they are often affected by interference from other communication signals, which poses a threat to the integrity and accuracy of the signal. Cognitive radio technology can automatically identify and avoid interference and improve the stability and accuracy of radio channels, thus ensuring the accuracy of navigation.
During aircraft flight, navigation equipment must ensure flight safety. Traditional navigation methods require manual signal confirmation and operation, which are susceptible to human errors and fatigue. The cognitive radio technology can be used by the crew to confirm the radio signal through simple operation, so as to reduce the occurrence of human errors and improve flight safety [ 91 ].
A traditional aircraft communication system is mainly composed of a mechanical navigation system and radio navigation system. The mechanical navigation system is vulnerable to bad weather and mechanical failure. The communication of the radio navigation system is vulnerable to signal interference and interruption, resulting in reduced reliability of navigation information. Cognitive radio technology can improve the communication between the aircraft mechanical navigation system and radio navigation system while maintaining the stability of radio signals.
The application of cognitive radio technology in civil aviation navigation can improve navigation accuracy, reduce radio channel interference, improve aircraft safety and improve aircraft communication, and lay a solid foundation for accurate flight, safe flight, and reliable operation of flights.
Airborne computers are the core computer systems used by airlines on aircraft. Cognitive radio technology is used to receive signals needed by airborne computers and convert them into formats that can be processed by computers. For example, airlines can use cognitive radio technology to receive data required by airborne computers, such as flight plans, weather data, etc., so that airborne computers can process these data and execute tasks.
Cognitive radio technology plays a vital role in the field of civil aviation. With the development of computer and digital communication technology, cognitive radio technology is constantly updated to meet the needs of flight communication and improve the quality and efficiency of flight communication.
The application of cognitive radio technology in the field of civil aviation involves communication systems, satellite communications, navigation and airborne computers. With the continuous development of technology, cognitive radio technology is becoming more and more important and influential in the field of civil aviation [ 94 ].
Cognitive radio technology in the field of civil aviation has received extensive attention and research. In the future, this technology will be more widely applied in the field of civil aviation, with the following main development trends:
Cognitive radio technology can improve flight safety by identifying and tracking the surrounding signal environment. In the future, cognitive radio technology will adopt more security mechanisms and adaptive algorithms to improve its reliability in response to unexpected situations such as communication interruption.
In the field of civil aviation, an aircraft must communicate with ground control consoles, other flights, weather stations, and other aircraft simultaneously, thus achieving multimodal communication is necessary. Cognitive radio technology will respond to this demand and support multiple communication modes to improve the utilization of the radio spectrum.
One of the development trends in the future is to improve the spectral efficiency. In the case of scarce spatial spectrum resources, improving the spectral efficiency of cognitive radio technology has become a major goal. Combining OFDM and MIMO technology with cognitive radio technology can achieve more efficient spectrum utilization.
With the improvement of computing power and processing speed, cognitive radio technology can support more complex and advanced algorithms and models to solve some complex problems that have not been solved in the existing technology. For example, machine learning, artificial intelligence, and other technologies will be widely used in cognitive radio technology to improve its performance and accuracy [ 95 ].
Cognitive radio technology will be combined with other technologies to support more applications. For example, combined with aviation control center technology, cognitive radio technology can improve the communication efficiency between different flights and provide more secure and reliable technical support for flight scheduling.
In conclusion, cognitive radio technology will play an important role in the field of civil aviation. With the development of technology and the increase in application scenarios, cognitive radio technology will show a broader and flexible development prospect.
Based on the development trend of cognitive radio technology, we can predict that it will play an important role in the field of civil aviation. First of all, using cognitive radio technology, aircraft communication, navigation, monitoring, control and other systems can achieve autonomous, cooperative, reliable, and efficient operation. Secondly, cognitive radio technology can process the sensing information obtained by the aircraft with high accuracy, efficiency, and speed, so as to realize prediction, control, and intervention operations and improve the performance and safety of the aircraft. At the same time, cognitive radio technology can also effectively reduce congestion, delay, and other problems in the civil aviation field and improve the overall operation efficiency and service quality through intelligent data analysis and optimization.
In the future, the application of cognitive radio technology in the field of civil aviation will be more popular and widespread. First, with the gradual maturity and improvement of related technologies, the performance of cognitive radio systems will be greatly improved, which can better meet the needs of practical applications. Secondly, the application scope of cognitive radio technology will continue to expand, covering more fields and scenarios, including control and command, airport operation, aircraft maintenance, etc. In the future, more application innovations may emerge, continuously improving the overall operational efficiency and safety of the civil aviation system.
However, the application of cognitive radio technology in the field of civil aviation still faces some challenges and problems. First, with the continuous development of civil aviation and the continuous expansion of flight control scale, the channel resource utilization and spectrum coexistence of cognitive radio technology will become more and more complex. Secondly, the application of cognitive radio technology needs to optimize and coordinate the resource allocation and scheduling of different systems and needs to solve many technical problems such as information security, equipment standards, mutual interference, etc.
Therefore, the future direction of development should be to pay more attention to the research and innovation of new technologies and develop more efficient, accurate, and intelligent cognitive radio systems to meet the needs and challenges of flight network operation. While achieving functional upgrades, we also need to develop unified standards and specifications, promote technical coordination and information sharing in the field of civil aviation, integrate and optimize civil aviation resources, and achieve more efficient, safe, and reliable operation of the civil aviation network.
In the future development of cognitive radio, there are many trends and prospects. First of all, research in cognitive radio will pay more attention to the development of intelligence and strive to continuously improve its intelligence level, so that it can more accurately perceive the radio environment and more accurately adjust the use of radio resources. Secondly, research in cognitive radio will seek better technology combinations to improve the utilization and efficiency of its radio spectrum.
In addition, the future development direction of cognitive radio will also involve its application in the field of civil aviation. The civil aviation industry, as a crucial field for air traffic safety, has high requirements for the safety and reliability of radio usage. The future development direction of cognitive radio will be closely combined with the civil aviation field to improve the reliability and safety level of its communication and navigation.
Finally, cognitive radio will continue to face various challenges and problems, such as insufficient spectrum resources, interference, etc. Therefore, in the future development of cognitive radio, it is necessary to constantly strengthen technical research and improve the technical level to meet these challenges and problems. The future development of cognitive radio will pay more attention to technological innovation and intelligent development and use radio in a more efficient, safer, and more reliable way by combining various advanced technologies. At the same time, the future development of cognitive radio also needs to strengthen the solution of existing problems and constantly solve new problems to promote its continuous development and growth.
This work was supported by the National Natural Science Foundation of China (61861018).
Conceptualization, R.Z.; methodology, R.Z.; investigation, X.L.; resources, Y.C.; supervision, Y.C.; funding acquisition, X.L. All authors have read and agreed to the published version of the manuscript.
Not applicable.
Data availability statement, conflicts of interest.
The authors declare no conflict of interest.
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Dr. camilla soravia tells us about the research published in her new proceedings b paper, a study which examined the effect of high temperatures on the cognitive abilities of the southern pied babbler..
The Southern pied babbler is a species of bird that inhabits the Kalahari desert in southern Africa, an area of the world that is experiencing hot, rapidly warming summers. A new study in Proceedings B examined the effect of high temperatures on the cognitive abilities of these birds. Lead author, Dr. Camilla Soravia , from the University of Western Australia, tells us more about this work.
Imagine taking an exam during a hot summer day with no air conditioning on… struggling? You would not be the only one. Research has repeatedly shown that humans can suffer cognitive decline under heat stress, which affects student performance in schools and represents an occupational health hazard worldwide. Surprisingly, until recently, we had not considered that animals in the wild might experience a similar phenomenon. With climate change leading to more frequent and severe heatwaves, it is crucial to understand how high temperatures may affect animal cognition - the way animals process information from the environment. This knowledge is vital because cognition helps animals to navigate environmental challenges, and in some cases, can determine survival and reproductive success in the wild.
One area of the world with hot, and rapidly warming, summers is the Kalahari desert in southern Africa. This region is inhabited by a species of birds called Southern pied babblers. In our study, we decided to test whether high temperatures affect their ability to learn new information, update what they learnt and control counterproductive behaviours. We built cognitive tasks to test each of these abilities and presented them to birds in the wild during mild and hot days. In the associative learning task, individuals had to learn which of two coloured lids hid a food reward. Once completed, we rewarded the other coloured lid to test their ability to reverse the learnt association. Finally, in the inhibitory control task, they had to stop their instinct of pecking at a transparent barrier and instead detour around it to retrieve a food reward.
We found that at 38 °C, pied babblers took twice as long to learn which colour hid the food reward compared to milder temperatures, showing that their ability to learn an association was significantly impaired. We did not find that they took longer to reverse the learnt association at high temperatures, but many individuals failed to complete this test, so we could not definitively establish the impact of temperature on reversal learning. Finally, in the inhibitory control task, we found that females but not males, took longer to refrain their instinct of pecking at the transparent barrier as temperatures increased.
Our work provides some of the first proof of cognitive decline in a wild animal under high temperatures and shows that the extent of this decline depends on the cognitive ability measured and attributes of the individual, such as sex. Cognitive impairment due to high temperatures is concerning, as it may limit animals’ ability to adjust their behaviour to a changing environment. Future research is needed to determine how widespread this effect is across different animal species and its consequences for survival and reproduction in the wild.
The Pied Babbler Research Project , founded by senior author Associate Prof. Amanda Ridley, has provided evidence of multiple negative effects of high temperatures on pied babblers’ lives, including a decline in their ability to catch prey during foraging and to raise young at high temperatures (e.g. Du Plessis et al. 2012, Bourne et al. 2020). On the other hand, recent work on Western Australian magpies lead by co-author Dr. Benjamin Ashton, in collaboration with Associate Prof. Amanda Ridley and Prof. Alex Thornton, has provided one of the first proofs that cognition predicts reproductive success in a wild bird (Ashton et al. 2018), highlighting the importance of cognition for wild animals. We knew from the human literature (e.g. Schmit et al. 2017) that heat stress can cause cognitive impairment, so we merged methodologies from the two research threads and decided to investigate this important knowledge gap - whether high temperatures affected cognitive performance in a wild bird.
Dr. Camilla Soravia is a postdoctoral researcher working at the Centre for Evolutionary Biology of the University of Western Australia. Her research focuses on the effects of rising temperatures on cognition and behaviour in wild birds.
Dr. Benjamin Ashton currently holds a DECRA Fellowship at Macquarie University in Sydney, Australia and is also affiliated with the University of Western Australia and the FitzPatrick Institute of African Ornithology at the University of Cape Town, South Africa. Ben’s research focuses on the causes and consequences of individual variation in cognitive performance.
Prof. Alex Thornton is based at the Centre for Ecology and Conservation of the University of Exeter, UK. One of the main aims of his research is understanding how environmental challenges, including anthropogenic change, shape animal cognition. More broadly, his research investigates cognition, behaviour and cultural evolution.
Associate Prof. Amanda Ridley established and currently leads the long-term Pied Babbler and Western Australian Magpie Research Projects. She is a behavioural ecologist based at the University of Western Australia and is an Honorary Research Associate at the FitzPatrick Institute of African Ornithology at the University of Cape Town, South Africa. Her research focuses on wild animals, often birds, using non-invasive procedures to investigate cooperative breeding, sociality, and cognition, including exploring the relationship between cognition and anthropogenic stressors.
Proceedings B is looking to publish more high-quality research articles and reviews in animal behaviour. If you have an idea for a review, we strongly encourage you to submit a proposal by completing our proposal template and sending it to the journal. More information about the journal and the submission process can be found on our website .
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Image credits:
Hero image: A pied babbler panting while perching. Credit: Nicholas Pattinson.
Image 1: A figure from the paper showing pied babblers interacting with the cognitive tasks in the heat. Credit: Nicholas Pattinson.
Image 2: A photo of lead author Camilla Soravia with the birds. Credit: Nicholas Pattinson.
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Spectrum Sensing (SS) plays an essential role in Cognitive Radio (CR) networks to diagnose the availability of frequency resources. In this paper, we aim to provide an in-depth survey on the most recent advances in SS for CR. We start by explaining the Half-Duplex and Full-Duplex paradigms, while focusing on the operating modes in the Full-Duplex. A thorough discussion of Full-Duplex operation ...
The cognitive radio (CR) prototype intended to scheme the future wireless communication. structures is emerging progressively more trendy, its v arious featur es are utilized within the presently ...
Cognitive radio innovation could be able to alleviate the limitation of accessible radio spectrum by facilitating dynamic spectrum access. Analysts have indeed been focusing on empowering this innovative idea in dealing with the wireless spectrum since its presentation. As a result, rapid progress has been made in this sector of exploration. Reviews and instructional exercise papers are ...
IRE 17004 67 ICONIC RESEARCH AND ENGINEERING JOURNALS 299. Recent Advances in Cognitive Radio. ANILA DHINGRA, MANISHA KUMAWAT, SONAL S HARMA. 1,2,3 Department of Electronic sand Communication ...
Cognitive radio (CR) is a software-defined radio (SDR) and a magical tool to relieve spectrum scarcity and reduce the consumed power for communication. This paper surveys the detection techniques integrated with artificial neural networks (ANN) in heterogeneous networks to address a future work to accelerate the establishment of reconfigurable ...
This paper examines the current state of cognitive radio technology, including ongoing research and development efforts, regulatory issues, and potential challenges to widespread adoption. The potential applications of cognitive radio technology in civil aviation are also explored, including improved spectrum utilization, increased safety and ...
The phrase cognitive radio is elaborated as follows []: "Cognitive radio is an intelligent wireless communication system that is aware of its ambient environment.A cognitive radio transmitter will learn from the environment and adapt its internal states to statistical variations in the existing RF stimuli by adjusting the transmission parameters (e.g., frequency band, modulation mode, and ...
Cognitive radio is a rapidly evolving technology that enables optimization of spectrum utilization via radios that can dynamically adapt their transmission parameters. Research on cognitive radio is of significant importance due to the increasing demand for use of the radio spectrum. This chapter provides an overview of cognitive radio ...
Transmit power control and data rate enhancement in cognitive radio network using computational intelligence International Journal of Electrical and Computer Engineering (IJECE) 10.11591/ijece.v12i2.pp1602-1616
Cognitive radio and mobile computation offer a promising paradigm to address bandwidth allotment challenges in wireless networks. Cognitive radio is a 5G technology, which deals with spectrum insufficiency or bandwidth problems. ... This Special Collection aims to present high-quality research papers that report the latest research advances in ...
The fifth Generation (5G) of wireless communication standards and Cognitive radio (CR) are believed to be the solution for present day data intensive applications. The 5G wireless networks are expected to provide higher data transfer rates, ubiquitous connectivity, low end-to-end latency, much higher system capacity and improved energy efficiency. Cognitive radio network (CRN) offers dynamic ...
About this book. This book provides an overview of the latest research and development of new technologies for cognitive radio, mobile communications, and wireless networks. The contributors discuss the research and requirement analysis and initial standardization work towards 5G cellular systems and the capacity problems it presents.
The concept of Cognitive Radio (CR) appeared as a new paradigm in 1999 as an extension of Software Defined Radio (SDR). It describes the situation where intelligent radio devices and associated ...
Cognitive radio (CR) is the enabling technology for supporting dynamic spectrum access: the policy that addresses the spectrum scarcity problem that is encountered in many countries. Thus, CR is widely regarded as one of the most promising technologies for future wireless communications. To make radios and wireless networks truly cognitive, however, is by no means a simple task, and it ...
A cognitive radio wireless sensor network is one of the candidate areas where cognitive techniques can be used for opportunistic spectrum access. Research in this area is still in its infancy, but it is progressing rapidly. The aim of this study is to classify the existing literature of this fast emerging application area of cognitive radio ...
In wireless communication system and mobile technology, cognitive radio plays an important role better in future. It is used in machine learning and with other fields and technologies as well. In this paper, we presented a survey on cognitive radio, associated research issue, its architecture, and various components related to it.
1 Abstract. Cognitive Radio (CR) is an adaptive, in telligent radio and netw ork technology that can automatically. detect av ailable channels in a wireless spectrum and change transmission ...
This paper provides an overview of cognitive radio technology and its applications in the field of civil aviation. Cognitive radio technology is a relatively new and emerging field that allows for dynamic spectrum access and efficient use of spectrum resources. ... The research of cognitive radio technology needs the cross knowledge of ...
Cognitive Radio (CR) is a promising technology to improve the spectrum utilization efficiency. Due to the increasing demand for wireless communication CR allows better use of the radio spectrum. CR is intelligent network that adapt to the changes in spectrum environment. The main aspect of the cognitive radio is spectrum sensing. It is one of the most challenging issues in cognitive radio ...
The research conducted on the cognitive radio is in its primitive stages. However, the need ... applications of the findings of this paper can be extended to cognitive radio design and implementation. Keywords: Cognitive Radio, Radio Spectrum, Radio ... Working of the Cognitive radio The new technology (cognitive radio) should satisfy the
Ben's research focuses on the causes and consequences of individual variation in cognitive performance. Prof. Alex Thornton is based at the Centre for Ecology and Conservation of the University of Exeter, UK. One of the main aims of his research is understanding how environmental challenges, including anthropogenic change, shape animal cognition.
Cognitive radio technology is a relatively new and emerging field that allows for dynamic spectrum access and efficient use of spectrum resources. In the context of civil aviation, cognitive radio ...
With the rapid deployment of new wireless devices and applications, the last decade has witnessed a growing demand for wireless radio spectrum. However, the fix ... This paper surveys recent advances in research related to cognitive radios. The fundamentals of cognitive radio technology, architecture of a cognitive radio network and its ...
5G and Cognitive Radio (CR) are the two emerging technologies to meet the heavy mobile data traffic of future wireless networks. The new era of communication will be dominated by 5G in future. As the future mobile broadband will be largely driven by ultra high definition video and as the things around us will be always connected, 5G aims to provide higher capacity and a network speed of 10Gbps ...