一种正交频分复用系统的非线性补偿技术  

Nonlinearity compensation technology for OFDM systems

作　　者：袁红林[1,2] 刘成云[1] 包志华[1] 

机构地区：[1]南通大学电子信息学院,江苏南通226019 [2]肯特大学

出　　处：《电视技术》2016年第1期87-90,94,共5页Video Engineering

基　　金：国家自然科学基金项目(61371111);交通运输部应用基础研究项目(2012-319-813-270);江苏政府留学奖学金(2012)

摘　　要：针对正交频分复用(OFDM)系统在功率放大器(PA)非线性较强时的性能问题,基于一种无线设备非线性与无线信道的联合估计技术,提出了一种基于训练序列的OFDM非线性信道估计与补偿技术。首先基于最小二乘(LS)算法进行发射机非线性与无线信道单位脉冲响应的联合估计,然后依次进行无线信道与发射机非线性的补偿。仿真结果显示,提出方法可逼近不考虑PA非线性时OFDM无线通信系统的完美均衡理论解析值。Aiming at the problem of communication performance of OFDM systems when the power amplifier （PA） nonlinearity is strong, and based on a kind of combined estimation technology for nonlinearity of transmitters and wireless channels, a nonlinear channel estimation and equalization technique of OFDM system is proposed based on training sequences. Firstly, the transmitter nonlinearity and unit impulse response of wireless channel are estimated with least squares （LS） algorithm, then the compensation of wireless channel and transmitter nonlinearity are done successively. Simulation results show that the proposed method may approach the result of OFDM wireless communication systems without nonlinearity under the perfect compensation of wireless channel.

关 键 词：OFDM 非线性信道 信道估计 信道补偿 LS 

分 类 号：TN92[电子电信—通信与信息系统]