基于FFT特性的低复杂度峰均比降低算法  

Low-Complexity PAPR Reduction Algorithm Based on FFT Properties

作　　者：黄玲[1] 安爱民[1] 王强[1] 

机构地区：[1]兰州理工大学电子工程与信息工程学院,甘肃兰州730050

出　　处：《自动化与仪器仪表》2013年第3期164-166,共3页Automation & Instrumentation

基　　金：国家自然基金项目(61064003);国家自然基金项目(51165024)

摘　　要：部分传输序列(PTS)方法是OFDM系统中降低PAPR的一种高效技术,但计算复杂度高。提出一种基于FFT特性的多相循环移位和共轭(PCSC)法,该方法先由一个IFFT运算产生一个时域序列,然后结合FFT的时域循环移位性和共轭性构造出不同的转换,在时域产生更多的备选序列。为进一步降低计算复杂度,PCSC法充分利用天线Tx1而在天线Tx2中未使用IFFT运算。仿真结果表明,在子块数量和相位加权系数相同时,本文所提出的PCSC方法相对于PTS方法具有更加良好的PAPR降低性能。Partial Transmit Sequence （PTS） is a high efficiency technique of reducing the high peak-to-average power ratio （PA- PR） in orthogonal frequency division multiplexing （OFDM） systems. While it＇ s computational complexity is high. A novel scheme, called as the polyphase circular shift and conjugate （PCSC）, is proposed. A time-domain sequence is generated by one IFFT from the proposed method and then it combines with the time-domain circular shift property and conjugate property of FFT to construct different transformations, which can generate more alternative candidate sequences in the time domain. To reduce the computational complexity furtherly, PCSC takes full advantage of the antenna Txl and do not use IFFT in the antenna Tx2 .Simulation results validate that the proposed method can provide good performances compared to PTS in the case of the same number of sub-blocks and phase weighting factors.

关 键 词：峰均比 部分传输序列 多相循环移位 共轭 

分 类 号：TN929.5[电子电信—通信与信息系统]