固定波形时间保护间隔0FDM系统循环卷积特性研究

Research of Circular Convolution in OFDM System with Fixed Waveform TGI

针对固定波形时间保护间隔OFDM系统接收端OFDM信息符号和信道冲击响应之间不具有循环卷积特性的系统特点,本文提出一种简单有效的信号处理算法对该系统接收端OFDM信息符号和信道冲击响应之间的循环卷积特性进行恢复。理论分析和计算机仿真表明,该算法能够恢复接收端此循环卷积特性;在时延扩展和AWGN信道条件下,系统误符号性能受到的影响微弱。

In this paper, a simple and effective algorithm was proposed for recovering relation of circular convolution between OFDM symbol and channel impulse response in receiver, since in OFDM system with fixed waveform , there doesn't exist relation of circular convolution between OFDM symbol and channel impulse response in receiver. By theoretical analysis and computer simulation, this method can reach the aim of recovering relation of cyclic convolution between OFDM symbol and channel impulse response, and in time-dispersive channel with AWGN, performance of Symbol-Error-Ratio was effected faintly.