A new transmit beampattern design method is proposed for the joint radar-communications (JRC) systems with circulating code array. Each array element of the designed JRC system transmits the same basic waveform with d...
详细信息
A new transmit beampattern design method is proposed for the joint radar-communications (JRC) systems with circulating code array. Each array element of the designed JRC system transmits the same basic waveform with different starting time, multiple beams towards the radar targets and the communication receivers are formed. For circulating code array, there is a certain relationship between the spectrum band of the transmitted signal and the coverage of the synthesized beampattern. By implementing spectrum planning according to the desired beampattern, flexible beampattern synthesis can be realized. Phase modulation term is attached to the phase of the transmitted signal in the corresponding communication spectrum band, and it is used to carry communication information. Unlike previous works, benefiting from the use of circulating coed array, multiple wide beams and narrow beams can be synthesized simultaneously in this paper without solving optimization problems. The effectiveness of the designed method is validated by numerical results.(C) 2022 Elsevier Inc. All rights reserved.
To ease the shortage of the spectrum resource, a dual-function radar-communications (DFRC) system based on circulating code array is proposed in this paper. The relationship between the spectrum of the synthesized sig...
详细信息
A dual-function radar-communications (DFRC) system based on circulating code array is designed in this paper. The communication symbols are firstly embedded into the continuous phase modulation (CPM) term and then att...
详细信息
A dual-function radar-communications (DFRC) system based on circulating code array is designed in this paper. The communication symbols are firstly embedded into the continuous phase modulation (CPM) term and then attached to the transmitted basic waveform. The particular configuration of the circulating code array provides a possibility to recover the spectrum of the transmitted basic waveform. According to the relationship between the spectrum of the synthesized signal and the spectrum of the basic waveform, a modified spatial-frequency modulation coefficient (SFMC) is proposed in the demodulation procedure. The proposed technique requires only one waveform to implement a DFRC system with an omnidirectional transmitted beam pattern. The communication function can be realized no matter that the communication direction is within the mainlobe or sidelobe of radar. It is verified that the designed DFRC system can make a balance between radar coherent processing performance and communication bit error rate (BER) performance. The communication information is secure from directions other than the intended ones. Simulation results are presented to validate the performance of the designed DFRC system. (C) 2020 Elsevier Inc. All rights reserved.
This study presents a new signal processing scheme for communication reception in a joint communications and sensing (JC&S) system, employing a linear frequency modulation-continuous phase modulation (LFM-CPM) wav...
详细信息
ISBN:
(纸本)9798350385458;9798350385441
This study presents a new signal processing scheme for communication reception in a joint communications and sensing (JC&S) system, employing a linear frequency modulation-continuous phase modulation (LFM-CPM) waveform based on circulating code array. Most existing studies on JC&S waveforms primarily address the design and theoretical performance of transmitted waveforms, with less attention given to the received model and subsequent signal processing. Recognizing the limitations of traditional maximum likelihood sequence estimation (MLSE) in handling space-frequency modulation-induced signal recovery challenges, this study proposes a communication signal processing scheme employing sliding window correlation detection (SWCD) and convolutional coding with hard decision decoding (HDD). This approach ensures that radar detection adheres to essential criteria while maintaining the bit error rate of communication within acceptable bounds, even under low signal-to-noise conditions, as demonstrated by simulations.
暂无评论