基于频域导频PTS-OFDM系统峰平比降低技术

对于无线通信系统而言,OFDM是一种非常有吸引力的传输技术,但是OFDM信号具有较高的峰平比特性.为了减小信号峰平比,本文利用部分传输序列PTS技术,提出了一种适用于基于频域导频OFDM系统的峰平比降低实现方案,给出了其实现算法及系统控制策略;并利用计算机仿真对该系统的峰平比和误码率性能进行了分析,仿真结果表明:PTS技术可以有效地改善OFDM信号的高峰平比特性.本方案采用FPGA实现其相应的硬件电路,经过实际的OFDM系统样机传输测试,证明了所提方法的实用性及其良好的性能.

PAPR reduction technique using partial transmit sequences in OFDM system based on the frequency domain pilots

Orthogonal frequency division multiplexing(OFDM) is an attractive technique for wireless communication applications.However,OFDM signals have a large Peak-to-Average Power Ratio(PAPR).To reduce the PAPR of OFDM signals,a novel PAPR reduction scheme is proposed using partial transmit sequences suitable for the OFDM system based on the frequency domain pilots.The algorithm and the scheme of system control are also presented.It analyses,through computer simulation,the effects of PTS on the performance of OFDM system,including the PAPR and the bit error rate.It is shown from the results that PTS is a promising technique in PAPR reduction for OFDM system.The correspondent FPGA hardware circuit through actual test proves its validity and its efficient performance.