基于联合法降低OFDM水声通信峰均比的研究

摘要

高峰均功率比限制了正交频分复用(OFDM)技术的广泛应用,如何选择合适有效的方法来降低高峰均比是这一领域的研究重点.利用压扩方法和限幅方法在性能上的互补性,提出一种联合方法.仿真结果表明,该方法有效地降低了OFDM系统的峰均比,而且简单易于实现.%The high peak-to-average (PAR) power ratio is one of the major problems in orthogonal frequency division multiplexing (OFDM) modulation system, which limits the wide application of OFDM technology. How to choose an appropriate and effective method to reduce the high PAR is the key point in this research. In this paper, a combined method is proposed based on the complementary of the companding transform and clipping. Simulation results show that the proposed scheme can effectively reduce the PAR of OFDM and it is easy to be implemented.