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针对正交频分复用(orthogonal frequency division multiplexing,OFDM)系统峰值平均功率比(peak average power ratio,PAPR)大的问题,提出了降低PAPR的联合算法。该算法在改进的部分传输序列(part transmission sequences,PTS)算法的基础上,加入压扩技术。联合算法在不增加系统复杂度的情况下,可有效地减小OFDM系统的PAPR。仿真结果表明:当子载波分组数为16、随机分组方式、4倍过采样、内层分组数为4、CCDF(complementary cumulative distribution function)为10-3时,联合算法与传统的PTS算法相比,PAPR减小了4.8 dB。
Aiming at the problem of large peak average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) system, a joint PAPR reduction algorithm is proposed. Based on the improved part transmission sequences (PTS) algorithm, this algorithm adds the compression technique. The joint algorithm can effectively reduce PAPR of OFDM system without increasing system complexity. The simulation results show that when the number of subcarriers is 16, random grouping mode, 4 times oversampling, the number of inner packets is 4 and the CCDF (complementary cumulative distribution function) is 10-3, the joint algorithm compared with the traditional PTS algorithm , PAPR decreased by 4.8 dB.