摘要
OFDM系统中,为去除码元间干扰(ISI)和载波间干扰(ICI)的影响,必须加足够长度的循环前缀(CP),导致带宽效率降低.建立了OFDM系统模型并对ISI和ICI进行了分析,在此基础上提出了一种基于最小均方误差(MSE)准则的判决反馈均衡(DFE)算法,可有效消除ISI和ICI的影响.分析和仿真结果表明:所提出的算法无论在带宽效率还是在误码率方面都要优于传统的OFDM系统.
In OFDM system, cyclic prefix （CP） is necessary to combat inter- symbol interference （ISI） and inter-carrier interference （ICI） , which results in a considerable bandwidth loss. In this paper, the analysis of ISI and ICI in OFDM system is given. And a decision feedback equalization algorithm based on MMSE criteria is proposed to eliminate ISI and ICI. Simulation results show that the proposed scheme has higher bandwidth efficiency and better performance in bit error rate （BER） than conventional OFDM with sufficient CP length.
出处
《上海师范大学学报（自然科学版）》
2008年第3期270-274,共5页
Journal of Shanghai Normal University(Natural Sciences)
基金
上海市教委科研项目(06DZ032)
关键词
OFDM
判决反馈均衡器
串行干扰消除
OFDM
decision feedback equalizer
successive interference cancellation
