OFDM系统降低峰平比方法的研究

Research on reducing the PAPR of OFDM systems

采用部分传输序列(PTS)降低OFDM系统中的峰平比。虽然PTS法具有不会使信号发生畸变,应用不受载波数限制,频谱损失小等优点,但是其实现起来计算量较大,限制了它在实际中的应用。在充分研究了基于汉明距离的PTS算法后,在其中加入门限值,仿真证明这种方法在不损失PAPR性能的前提下,可以进一步降低复杂度,具有较强的实用性。

This paper proposes a method based on PTS to reduce the PAPR of OFDM. Though, the PTS method possesses the advantages of antidistortion, not being limited by the number of carriers, less loss of frequency spectrum. However, the most serious flaw of PTS is the heavy complexity of computation, which strongly restricts the application of PTS method. This paper had studied Hamming distance in VIS algorithm. By introducing optimum threshold and parameter in Hamming distance PTS algorithm, the improved PTS algorithm can reduce calculation complexity greatly. Simulation shows that the improved method has a better practicability because it can effectively reduce calculation complexity of method and maintain the low PAPR of OFDM system.