无人机高速遥测信道中OFDM峰均比抑制性能研究

Performance analysis of PAPR reduction of OFDM in high-data-rate telemetry channel of UAV

OFDM是无人机高速遥测信道中的主要传输技术之一,但是OFDM系统的主要缺陷之一是具有较高的峰均比。文中研究了一种信道纠错编码与迭代限幅滤波算法(Repeated Clipping and Filtering,RCF)相结合的峰均比抑制方案。仿真结果表明,RCF算法能够实现峰均比的有效抑制,卷积编码和Turbo编码能够有效抑制RCF算法产生的限幅噪声,降低系统误码率。

OFDM is one of the main transmission technologies in high-data-rate telemetry channel of UAV. One of the main drawbacks of OFDM is the high PAPR （Peak to Average Power Ratio）. A scheme with the combination of channel FEC coding and RCF （Repeated Clipping and Filtering） is proposed for the reduction of PAPR. It is shown that RCF algorithm can effectively reduce PAPR, and convolutional coding and turbo coding can significantly reduce the clipping noise and alleviate the bit error rate performance degradation.