降低OFDM信号峰均功率比的分段线性压扩变换  

Piecewise-linear companding transform for peak-to-average power ratio reduction of OFDM signals

作　　者：杨品露[1] 胡爱群[1] 

机构地区：[1]东南大学信息科学与工程学院,江苏南京210096

出　　处：《通信学报》2011年第8期1-7,共7页Journal on Communications

基　　金：江苏省产学研联合创新基金资助项目(BY2009149)~~

摘　　要：为了降低OFDM信号的峰均功率比(PAPR),设计了一种分段线性压扩变换。对小幅度通过数乘变换进行线性放大,而对大幅度先利用数乘变换进行线性缩小,再对缩小后的幅度进行等量放大。得到的压扩变换是分段线性且连续的,用低复杂度的线性运算抑制峰均比,同时用分段的方法减小压扩对系统性能的影响。理论分析和仿真表明,通过数乘因子和增量数值的选取,可以在PAPR抑制和系统误码率性能上取得折中。相比于已有的线性和非线性压扩变换,改善了发送信号的功率谱密度特性。In order to reduce the peak-to-average power ratio（PAPR） of orthogonal frequency division multiplexing（OFDM） signals,a piecewise-linear companding transform was proposed.Small amplitudes were multiplied by a scale factor,while large ones were not only multiplied by a scale factor but also added by a shift.The resulting companding transform was piecewise-linear and continuous.It can provide significant PAPR reduction performance with low compu-tational complexity,and has low influence on system performances through piecewise transform.It is shown by theoreti-cal analysis and simulation that,a good trade-off between PAPR reduction and bit-error-rate performances can be achieved by carefully choosing the two scales and the shift.Furthermore,compared with existing linear and nonlinear companding transforms,a better power spectral density performance can be achieved.

关 键 词：正交频分复用 峰均功率比 压扩变换 

分 类 号：TN919.3[电子电信—通信与信息系统] TN929.5[电子电信—信息与通信工程]