Song Ran, He Jing
Opt Lett. 2022 Jun 1;47(11):2931-2934. doi: 10.1364/OL.460188.
In this Letter, an effective integrated waveform generation method where an orthogonal frequency division multiplexing (OFDM)-based non-orthogonal multiple access (NOMA) communication signal combined with a linear frequency modulation (LFM) radar signal is proposed and experimentally demonstrated in a W-band communication and radar detection system. The proposed method can generate communication and radar signals simultaneously. In addition, multiple user communication and multi-target radar detection can be realized. Furthermore, for the OFDM-NOMA signal, discrete Fourier transform (DFT) precoding is used to keep the optimal power ratio consistent on different subcarriers, thus, the communication performance can be effectively improved. The experimental results show that the distance estimation error is 1.2 cm for radar signals. Meanwhile, after transmission over 0.8-m free space, the total aggregate rate for two users with the OFDM-NOMA signal is 3.125 Gb/s under the bit error rate of 8.5 × 10.
在本信函中，提出了一种有效的集成波形生成方法，并在W波段通信和雷达探测系统中进行了实验验证。该方法将基于正交频分复用（OFDM）的非正交多址接入（NOMA）通信信号与线性调频（LFM）雷达信号相结合，能够同时生成通信信号和雷达信号。此外，还可实现多用户通信和多目标雷达探测。再者，对于OFDM-NOMA信号，采用离散傅里叶变换（DFT）预编码来保持不同子载波上的最优功率比一致，从而有效提高通信性能。实验结果表明，雷达信号的距离估计误差为1.2厘米。同时，在0.8米自由空间传输后，OFDM-NOMA信号下两个用户的总聚合速率在误码率为8.5×10时为3.125 Gb/s。
