摘要
针对正交频分复用(OFDM)系统中归一化频偏所引起的载频间干扰(ICI)系数分布特点,设计了一种通用的OFDM预编码传输方案。可将ICI系数更好地集中在较少的子载波位置上,使接收端的干扰矩阵成为稀疏的矩阵,简化信号检测。从理论分析与系统仿真这2方面对这一算法进行了研究。与已有的基于均衡的ICI抑制算法相比,所建议的算法具有更低的计算复杂度;与ICI自身干扰抑制算法相比,具有更高的频带利用率。
In view of the inter-carrier interference（ICI） coefficients characteristic caused by the normalized frequency offset in orthogonal frequency division multiplexing（OFDM） systems,a general precoder design scheme was proposed for OFDM mobile systems.The linear precoder at transmitter could make the ICI coefficient to be concentrated on a few subcarriers and be set zero at other subcarriers.The interference matrix at receiver would be replaced by a sparse matrix,and signal detection could be simplified.Both theoretical analysis and simulation results were presented for the proposed scheme.Compared with existing mitigation ICI schemes with equalization,the proposed scheme has lower computational complexity,and compared with self-cancellation scheme,the bandwidth efficiency is improved.
出处
《通信学报》
EI
CSCD
北大核心
2010年第5期122-127,共6页
Journal on Communications
基金
综合业务数字网国家重点实验室课题基金资助项目(ISN-9-07)~~
