多径信道下基于压缩扩张的OFDM系统PAPR抑制算法

OFDM系统中存在较大的峰均比(Peak-to-Average Power Ratio,PAPR),特别在多径信道中接收的信号严重失真,星座图恶化,严重影响了系统传输性能。针对该问题,对多径信道下OFDM系统PAPR抑制进行研究,采用频域均衡技术,提出了一种多径信道下基于压缩扩张的OFDM系统PAPR抑制算法。仿真结果表明,所提算法在抑制PAPR的同时能消除多径效应影响,避免信号失真和星座图恶化。对比传统算法,所提算法星座图EVM最大降低0.19,抑制PAPR能力提升1 dB。

PAPR Suppression Algorithm for OFDM System based on Compressive Expansion in Multipath Channel

There is a high PAPR(Peak Average Power Ratio)in OFDM(Orthogonal Frequency Division Multiplexing)system,especially the signal received in the multipath channels is seriously distorted,the constellation diagram deteriorated,and the transmission performance of the system severely affected.Aiming at this problem,PAPR suppression of OFDM systems under multipath channel is explored,and by adopting frequency domain equalization technology,a PAPR suppression algorithm for OFDM systems based on compressive expansion in multipath is proposed.Simulation results indicate that the proposed algorithm can eliminate the effects of multipath effects while suppressing PAPR,and avoid signal distortion and constellation deterioration.Compared with the traditional algorithm,the proposed algorithm has a maximum reduction of 0.19 in the constellation EVM and an increase of 1 dB in PAPR suppression.