使用联合算法来降低OFDM系统的峰均比

在降低OFDM系统峰均比(PAR)的众多方法中，均有其优缺点。在很多情况下，仅使用一种算法并不能够达到想要的降低效果，或者为了达到理想效果，在某一方面的性能损失较大。针对这种情况，鉴于PTS算法与冲激相消法之间的互补性，提出了一种联合算法：PTS Clipping算法。算法先利用PTS算法对OFDM信号进行处理以降低PAR，所得信号再利用冲激相消法进行处理，以进一步降低PAR。只要两种方法对峰均比的降低程度选取得当，就可以在降低峰均比的情况下既减小运算量，又不产生过大的噪声干扰。数据仿真验证了所提方法的有效性。

Reducing the peak-to-average power ratio of OFDM System by union algorithm

Methods of reducing the Peak-to-Average-Power Ratio (PAR) of the Orthogonal Frequency Dixision Multiplexing (OFDM) system have their advantages and disadvantages. In many cases, only using one of them can not achieve the desired effect of reducing or can achieve the desired effect but at the price of large performance loss on certain aspect. In view of such a situation, a joint algorithm named PTS-Clipping algorithm was given based on the complementarity between the PTS and impulse cancellation. Firstly, the algorithm used PTS to process OFDM signal to reduce PAR, then the result was further processed by impulse cancellation to further reduce PAR. As long as the two methods of reducing the PAR level were selected properly, it could reduce PAP and the computational complexity, and not have too much noise. Simulations have proved the validity of the proposed method.