OFDM系统峰均比抑制的迭代FFT算法

Reduction the PAPR of OFDM Systems Based on Iterative FFT Algorithm

在正交频分复用(OFDM)系统中,采用快速傅里叶变换(IFFT和FFT)来实现高效的调制和解调。针对OFDM的高峰均比(PAPR)问题,结合限幅法操作简单和选择映射算法(SLM)以及部分传输序列法(PTS)对信号无畸变和效率高的优点,提出了一种基于迭代FFT的峰均比抑制算法。该算法利用系统中已有的IFFT(FFT)调制模块来降低OFDM的PAPR。并通过仿真试验证实该方法可以显著降低OFDM信号的峰均比,具有一定的工程意义。

In the Orthogonal Frequency Division Multiplexing （OFDM） system, the FFT and IFFT are used to realize the high-efficiency modulation and demodulation. In order to solve the PAPA problem of OFDM system, a new method for PAPR reduction was proposed which is called iterative FFT algorithm. The new method combined the simple of clipping and the distortionless and high-efficiency of SLM and PTS. Because the FFT and IFFT module has been used as modulation, so it without need add another module. Through the simulation it is found that the new method can reduce the PAPR of OFDM effectively, which have certain significance of engineering.