一种降低OFDM系统PAPR的低复杂度盲SLM方法  

A Blind SLM Scheme for Reducing the PAPR of OFDM Systems with Low Complexity

作　　者：纪金伟 夏玉杰[2] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]洛阳师范学院物理与电子信息学院,河南洛阳471022

出　　处：《无线电工程》2017年第5期27-31,共5页Radio Engineering

基　　金：河北省自然科学基金资助项目(F2014210123)

摘　　要：针对传统选择映射方法复杂度过高和需要传输边信息的问题,提出了低复杂度的盲选择映射方法。该方法巧妙地设计了一组相位旋转矢量,并将一个或几个正交频分复用符号看作一个符号块,使得每个符号块中都有一个符号具有导频符号,利用设计的相位旋转矢量对应的转换矩阵与原信号块的时域相乘运算代替反傅里叶变换运算产生的备选信号块。在接收端通过导频符号估计出包含相位旋转矢量信息的等效信道,从而实现了不需要边信息的盲数据检测。分析与仿真结果表明,与常规选择映射方法相比,提出的方法复杂度大大降低,在不需要传输边信息的情况下可以达到相近的降峰均比性能。To avoid the high computational complexity and transmission of side information in conventional selected mapping （SLM） schemes, a blind SLM scheme with low complexity is proposed. In the proposed scheme, a set of phase rotation vectors is delicately designed.And one or several orthogonal frequency division multiplexing（OFDM） symbols are treated as a processing block where there is one OFDM symbol with pilot subcarriers.The candidate signal blocks are generated by replacing the inverse fast Fourier transform operations（IFFT） by the multiplication operations between the conversion matrices corresponding to the phase rotation vectors and the original signal block.At the receiver, the equivalent channel containing the phase rotation vectors is estimated with the pilot data which enables blind data detection. Analyses and computer simulations show that, as compared with the available SLM schemes, the proposed scheme has much lower computational complexity and can achieve similar peak-to-average power ratio （PAPR） reduction performance without side information.

关 键 词：正交频分复用 峰均比 选择映射 边信息 

分 类 号：TN911.7[电子电信—通信与信息系统]