Abstract: The method of the invention is related to utilizing the convergence patterns of sparse coding for detecting a primary user emulation/signal jamming attack in a cognitive radio setting. The method basically comprises a training stage and a testing stage. Through the method, the hypothesis which shows that there is no primary user but only noise (H0), the hypothesis which shows that there is a legitimate primary user present with a right to use the spectrum and the secondary user should not use the spectrum (H1), and the hypothesis which shows that there is a primary user emulator/signal jammer in the environment (H2) can be distinguished.

Abstract: Disclosed is a secure and adaptive waveforms multiplexing system in advanced-level wireless communication systems (such as 5G and beyond systems).

Abstract: A method based on orthogonal frequency division multiplexing (OFDM) called OFDM-subcarrier gap and index modulation (OFDM-SGIM) is proposed in which the gaps between the active subcarriers are exploited to transmit extra bits alongside the conventional QAM symbols. Thereafter, the index modulation is combined with the new proposed OFDM-based scheme to guarantee a fixed subblock size.

Abstract: A single carrier transmission that minimizes spectral efficiency loss and reduces out of band emission by using adaptive filtering in a block where different filter parameters are used for different symbols within a block.

Abstract: Disclosed are various strategies on general system optimization and selection of user parameters related to waveforms during the usage of multiple waveforms and/or multiple numerology structures in fifth generation (5G) and beyond next generation cellular communication systems.

Abstract: A single carrier transmission that minimizes spectral efficiency loss and reduces out of band emission by using adaptive filtering in a block where different filter parameters are used for different symbols within a block.

Abstract: Disclosed is a method which aims to minimize the effects of inter-numerology interference between users that a base station in 5G and beyond cellular communications systems serves with multiple numerology structures by determining the users at the numerology edges optimally.

Abstract: A system and method for providing confidentiality against eavesdropping and authentication against impersonation attacks for advanced wireless communication systems are disclosed. The method exploits ARQ as a MAC layer mechanism and artificial noise as a physical layer mechanism with maximal ratio combining to achieve secrecy. An artificial noise, not requiring class space in the channel, is designed and added to the data package based on the QoS requirements and channel condition between legitimate parties. Basically, a special AN, which does not require null-space in the channel, is designed based on the QoS requirements and the channel condition between the legitimate parties and injected to the data packet. If the same packet is requested by the legitimate receiver (Bob), an AN cancelling signal is designed and added to the next packet. Then, an AN-free packet is obtained by using MRC process at Bob, while deteriorating the eavesdropper's performance.

Abstract: According to the necessities of users under a service of one base station, the disclosed method decides how many instantaneous numerology structures should be used mostly and selects the most suitable numerologies from the existing numerology set.

Abstract: According to the necessities of users under a service of one base station, the disclosed method decides how many instantaneous numerology structures should be used mostly and selects the most suitable numerologies from the existing numerology set.

Abstract: A system and method for providing confidentiality against eavesdropping and authentication against impersonation attacks for advanced wireless communication systems are disclosed. The method exploits ARQ as a MAC layer mechanism and artificial noise as a physical layer mechanism with maximal ratio combining to achieve secrecy. An artificial noise, not requiring class space in the channel, is designed and added to the data package based on the QoS requirements and channel condition between legitimate parties. Basically, a special AN, which does not require null-space in the channel, is designed based on the QoS requirements and the channel condition between the legitimate parties and injected to the data packet. If the same packet is requested by the legitimate receiver (Bob), an AN cancelling signal is designed and added to the next packet.

Abstract: Disclosed is a secure and adaptive waveforms multiplexing system in advanced-level wireless communication systems (such as 5G and beyond systems).

Abstract: Disclosed is a method which aims to minimize the effects of inter-numerology interference between users that a base station in 5G and beyond cellular communications systems serves with multiple numerology structures by determining the users at the numerology edges optimally.

Abstract: A joint demodulator is configured to generate an estimated first frequency or first frequency error for the first signal and an estimated second frequency or second frequency error for the second signal. A first long-term automatic frequency control is responsive to the estimated first frequency or first frequency error, wherein the joint demodulator is responsive to the first long-term automatic frequency control. A second long-term automatic frequency control is responsive to the estimated second frequency or second frequency error, wherein the joint demodulator is responsive to the second long-term automatic frequency control. First and second local automatic frequency controls also may be included in the joint demodulator, wherein the first long-term automatic frequency control is responsive to the first local automatic frequency control and the second long-term automatic frequency control is responsive to the second local automatic frequency control.

Abstract: A Doppler spread for a communications channel is measured by providing an estimate of the communications channel and generating an autocorrelation function for the estimate of the communications channel. One of a plurality of autocorrelation function hypotheses is selected to approximate the autocorrelation function for the estimate of the communications channel wherein each of the autocorrelation function hypotheses corresponds to a respective Doppler spread estimate hypothesis. One of the Doppler spread estimate hypotheses is selected corresponding to the selected autocorrelation function hypotheses as an estimate of the Doppler spread for the communications channel.

Abstract: A method for receiving a plurality of communications from a respective plurality of transmitters using a common carrier frequency includes receiving a plurality of information signals on a common carrier frequency corresponding to the plurality of communications from the plurality of transmitters, and generating first and second separated signals corresponding to respective first and second ones of the information signals so that the first separated signal includes a primary component corresponding to the first information signal and so that the second separated signal includes a primary component corresponding to the second information signal. The first separated signal is demodulated to provide an estimate of a first information sequence corresponding to the first information signal, and the estimate of the first information sequence is modulated to provide a modulated estimate of the first information sequence.

Abstract: Methods and systems are provided which generate hard and soft values from signal samples of a differentially encoded signal by estimating channel coefficients associated with the received signal and determining metrics for each possible symbol pair which indicate the probability of a possible coherent symbol pair being encoded in the signal samples using the estimated channel coefficients and the signal samples. Soft values associated with differential bits or differential symbols encoded in the samples of the signal are then generated based on the determined metrics.

Abstract: Methods and systems are provided which utilize pilots in an information sequence to periodically retrain a channel estimator. Thus, a channel tracker may be synchronized using a synchronization sequence and then periodically retrained using known pilot symbols. Furthermore, the utilization of pilots may allow for the detection of errors in previous channel estimates. When errors are detected, a new channel estimate may be used based on the retraining using the pilot symbols and, optionally, previous errors in symbol estimation may be corrected. Thus, by retraining based on pilot symbols, the propagation of errors may be reduced.