分布式发射天线MIMO OFDM的一种低复杂度频偏校正算法  

A Low Complexity Carrier Frequency Offsets Correction Method for MIMO OFDM Systems with Distributed Transmit Antennas

作　　者：孙科[1] 唐友喜[1] 邵士海[1] 邓凯[1] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,四川成都611731

出　　处：《电子学报》2010年第7期1688-1692,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60832007;No.60901018;No.60902027;No.60572090);国家重大科技专项(No.2009ZX03003-008-01);国家高技术研究发展计划(863计划)(No.2009AA01Z236);广东省重大科技专项(No.2008A09030003);华为基金(No.YBWL2008066)

摘　　要：在分布式发射天线MIMO OFDM系统中,各发射天线由于使用独立的晶振导致了每根发射天线到接收机间具有不同的频率偏移.为了降低频偏造成的子载波间干扰,本文提出一种以最大化每根接收天线上子载波的条件平均信干噪比为准则,校正接收信号中频率偏移的算法.利用多项式近似法对条件平均信干噪比作近似处理,获得了低复杂度的频偏校正值解析式.与已有的频率偏移校正算法相比,所提算法的性能略有提升,复杂度降低50%或更多.In multi-input multi-output（MIMO） orthogonal frequency division multiplexing （OFDM） systems with distributed transmit antennas,each transmit antenna has its own oscillator,which leads to different frequency offsets（FOs） between the receiver and each transmit antenna.In order to reduce the inter-carrier interference caused by the FOs,a FOs correction algorithm is proposed,which maximizes the conditional average signal-to-interference-and-noise ratio（SINR） of subcarriers on each receive antenna.By properly exploiting the polynomial approximation method to approximate the conditional average SINR,a computationally efficient expression of the FOs correction value is obtained.Compared with the existing FOs correction algorithm,the proposed algorithm offers slight performance improvement and achieves at least 50% complexity reduction.

关 键 词：分布式发射天线系统 多输入多输出 正交频分复用 频偏校正 

分 类 号：TN914[电子电信—通信与信息系统]