一种降低OFDM系统峰均功率比的算法

在对选择映射和分步传输序列算法进行研究的基础上,提出了一种新的降低峰均功率比的算法——分段映射算法,并对其进行了理论推导。分段映射算法首先将原始信号序列分为V个部分,每个部分称为一个子路;通过控制这些子路随机变量的功率方差,从而达到控制信号序列峰均功率比的目的。分段映射算法需要额外付出的代价是对计算得出的映射表进行存储。实际的仿真结果证明:分段映射算法结构简单,相对于选择映射和部分传输序列等扰码算法在降低系统峰均功率比方面具有较好的效果。

A New Algorithm for Reducing the PAPR of OFDM Signals

On the basis of studying the SLM(selected mapping) and PTS(partial transmit sequences) algorithms,a new algorithm named as subsection mapping is proposed and deduced to reduce the PAPR(peak to average power ratio) of OFDM(orthogonal frequency division multiplexing) signals. The main idea of subsection mapping is to divide the signal sequence into several parts which are called subsequences. By controlling the power variance of the subsequences the PAPR of the signal sequence can be restricted. The disadvantage of the subsection mapping is that the mapping table has to be stored in the memory. After the theoretic deduction and numerical simulation, this new algorithm is proved to have better performance for reducing the PAPR of OFDM signals comparing to the SLM and PTS.