基于MDPSO-Clipping联合算法降低峰均功率比

Reduction of Peak to Average Power Ratio Based on MDPSO-Clipping Joint Algorithm

针对正交频分复用系统中峰均功率比较高的问题,对传统的部分传输序列法作出改进,以降低信号的峰均功率比。改进的原理是将部分传输序列法中相位因子的选取与改进后的离散粒子群优化算法(modified discrete particle swarm optimization,MDPSO)相结合,得到峰均功率比降低后的信号,再将该信号利用限幅法(Clipping)进行削峰处理以达到进一步降低峰均功率比的效果。实验数据表明,在损失微小的误码率情况下,MDPSO-Clipping算法的峰均功率比优于PTS算法的峰均功率比0.4dB左右,且上述算法的时间复杂度更低。

Aiming at the problem of high peak to average power in orthogonal frequency division multiplexing system,we improved the traditional partial transmit sequence method to reduce the peak to average power ratio of signals.The principle of improvement is to combine the selection of phase factor in partial transmit sequence method with the modified discrete particle swarm optimization algorithm to get the signal that the peak to average power ratio decreases,then,the peak to average power ratio is further reduced by using the Clipping to cut the peak.Simulation data show that the peak to average power ratio of the MDPSO-Clipping is better than the PTS under the small loss rate of bit error rate(0.5 dB),and the time complexity of the MDPSO-Clipping is lower.