非线性信道下OFDM峰均比抑制算法研究

Research on PAPR Reduction Algorithms for OFDM in Non-linear Channel

针对正交频分复用(OFDM)具有较高的峰值平均功率比(PAPR)问题,对常用的几种典型的OFDM峰均比抑制算法进行了简要介绍,通过建立实际的非线性信道仿真模型,在系统频谱辐射模板约束下对几种算法降低峰均比的能力和对功率放大器输出功率回退的改善性能进行了仿真,同时对各算法的误码率性能进行分析。仿真结果表明限幅法的综合性能较好,易于实现,可在实际系统中进行应用。

Aiming at higher PAPR in OFDM, some typical PAPR reduction algorithms in OFDM are introduced briefly. Then a practical non-linear channel model is established. Under the spectrum mission mask, a simulation is done to analyze the PAPR reduction capability of some algorithms, the performance improvement of output backoff of power amplifier, and BER performance of some algorithms. The simulation results show that the clipping method has better performance and easy implementation, and can be used in practical systems.