OFDM系统中基于软干扰抵消的Turbo均衡算法研究  

Research on Turbo Equalization Based on Soft Interference Cancellation for OFDM Systems

作　　者：白林[1] 张一琼[2] 

机构地区：[1]中国电子科技集团公司第五十四研究所 [2]中国人民解放军61906部队

出　　处：《无线电通信技术》2015年第4期61-63,83,共4页Radio Communications Technology

摘　　要：针对OFDM系统中子载波间干扰带来的性能恶化问题,在最优Turbo均衡的基础上,提出了基于软干扰对消技术的MAP均衡算法。Turbo均衡部分首先利用先验信息进行干扰抵消,然后通过干扰抵消输出结果计算编码比特后验概率;同时对信道矩阵进行带状近似,提出简化算法,运算复杂度进一步降低。通过仿真分析表明,相比于传统turbo均衡算法,该算法在工程应用中更具有可行性。Due to performance deterioration caused by inter-carrier interference （ICI）in OFDM system, a MAP equalization algorithm based on soft interference is presented on the base of optimal turbo equalization. The turbo equalization firstly makes interference cancellation by using prior data, and then calculates the posterior probability after bit coding through interference cancellation output result.Meanwhile,a simplified version of this algorithm is also introduced by considering the band approximation of channel matrix.The simulation analysis result shows that the algorithm is more available in engineering application compared with traditional turbo balance algorithm.

关 键 词：正交频分复用 子载波间干扰 TURBO均衡 软输入串行干扰抵消 

分 类 号：TN915[电子电信—通信与信息系统]