OFDM系统中ICI抑制算法研究

Research on ICI Suppression Algorithm in OFDM System

正交频分复用(OFDM)系统中子载波间干扰(ICI)对系统的误码率性能有很大影响。针对该问题,提出一种复数加权的ICI自消除算法。与数据取反自消除算法不同,该算法首先将发送数据进行复数加权,且复数权系数中的参数根据子载波数目而变化。通过选择合适的参数,使接收信号中的有用信号达到最大,从而抑制子载波间干扰。仿真结果表明,复数加权自消除算法可以减小子载波间的干扰,提高系统的误码率性能。

In Orthogonal Frequency Division Multiplexing （OFDM） system,the Inter Carrier Interference （ICI） has great influence on the Bit Error Ratio（BER） performance, to solve this problem, the complex weighted ICI self-cancellation algorithm is proposed. Different from the opposite data self-cancellation, the proposed algorithm weighted the transmission data with complex number,and the parameter of the complex number was different according to the number of subcarriers. By choosing the appropriate parameter, the useful signal of the received signal can reach the maximum, and the inter carrier in- terference was suppressed. The simulation results show that the complex weighted self-cancellation algorithm can reduce the interference between the subcarriers and improve the BER performance of the system.