限幅法降低OFDM雷达通信一体化系统PAPR研究

为解决基于OFDM信号的雷达通信一体化系统峰均功率比较高的问题,分析了雷达与通信信号的特点,根据一体化系统实际,利用直接限幅算法对基于OFDM信号的雷达通信一体化系统PAPR进行抑制,并对不同限幅门限下PAPR抑制性能、系统误码率以及互相关函数进行了计算机仿真。研究表明,只要合理设置限幅门限,直接限幅法能够有效地降低一体化系统PAPR,由于限幅模块位于发射端,因此对雷达分系统目标检测性能影响较小;对于通信分系统,对信号直接限幅后会对误码率带来一定的影响,但是在信噪比较小时,仿真结果表明不论在衰落信道还是AWGN信道,直接限幅对系统的误码率性能影响不大。

Research on Deliberate Clipping for PAPR Reduction of Integrated Radar and Communication Systems Based on OFDM Signals

To deal with the PAPR of integrated radar and communication systems based on OFDM signals, the properties of the signals for the radar and the communication are analyzed. A deliberate clipping algorithm is proposed and applied to restrain the PAPR. The computer simulations of the PAPR performance, bit error ratio and cross correlation function are made at different clipping thresholds. The research indicates that, when the clipping thresholds are set in reason, deliberate clipping can restrain the PAPR effectively. As the deliberate clipping module lies in transmitter, it brings few influence on the target detection of the radar subsystem. As to the communication subsystem, when the clipping threshold reaches more than 4 dB, the computer simulation indicates that no matter in the fading channel or AWGN channel, the deliberate clipping also has few effect on the performance of BER.