Integrated Signal Technology of Radar-Communication Based on Filter Bank MultiCarrier Interleaved Comb Spectrum
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摘要: 雷达通信一体化是在实现无线通信的同时实现目标探测，以减小电磁干扰，提高频谱利用率。信号设计是雷达通信一体化技术实现的关键。由于常见的基于正交频分复用(OFDM)的雷达通信一体化信号存在频偏敏感和带外辐射过高的问题，不适用于高动态应用场景。考虑到滤波器组多载波(FBMC)信号具有高多普勒容限和低带外泄露的优点，该文在FBMC框架下，通过优化雷达通信子载波时频位置，提出了一种FBMC梳状谱雷达通信一体化信号设计方法。由于FBMC信号载波间与符号间存在固有干扰，因此信道估计不准确且不适应快时变信道，因此该文设计了一种交错梳状辅助导频结构，消除固有干扰的同时实现信道跟踪。此外，一体化信号中雷达复信号会对通信信号引入实干扰，该文提出了一种基于干扰利用的实干扰补偿算法，将实干扰用于通信信号还原。仿真结果表明，在快时变信道下，该文所设计的雷达通信一体化信号在进行高数据率传输过程中具有较低的误码率，且具有较好的雷达探测性能。Abstract: Radar-communication integration can realize both target detection and wireless communication, so as to reduce electromagnetic interference and improve spectrum utilization. The integrated signal design of radar and communication is the key to the realization of integrated technology. The common radar communication integration signals based on Orthogonal Frequency Division Multiplexing (OFDM) have the problems of frequency offset sensitivity and excessive out-of-band radiation, so they are not suitable for high-dynamic applications. Considering the advantages of Filter Bank MultiCarrier (FBMC) signal with high Doppler tolerance and low out-of-band leakage, the time-frequency locations of radar and communication subcarriers are optimized under the framework of FBMC, and a design method of FBMC comb spectrum radar-communication integrated signal is proposed. Since there is inherent interference between FBMC signal carriers and symbols, which leads to inaccurate channel estimation and is not suitable for fast time-varying channels, an interleaved comb-shaped auxiliary pilot structure is designed to eliminate inherent interference and achieve channel tracking. In addition, the radar complex signal in the integrated signal introduces real interference to the communication signal. A real interference compensation algorithm is proposed based on interference utilization, which is used to restore the communication signal. The simulation results show that under the fast time-varying channel, the designed radar-communication integrated signal has a lower bit error rate and better radar detection performance in the process of high data rate transmission.
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表 1 仿真参数
参数 参数值 符号数N/子载波个数M 12/9600 FBMC符号时宽(μs) 80 子载波间隔$ \Delta f $(kHz) 12.5 信号带宽(MHz) 100 抽样频率(MHz) 120 导频间隔$ {N_f}/{N_t} $ 12/6 调制方式 16QAM 
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