一种基于均匀分布型的MIMO OFDM系统最优导频设计  

An optimal pilot design based on uniformly distributed types for MIMO OFDM systems

作　　者：耿欣[1] 胡捍英[1] 

机构地区：[1]信息工程大学信息工程学院,河南郑州450002

出　　处：《电路与系统学报》2012年第4期70-75,共6页Journal of Circuits and Systems

基　　金：十一五863计划重点项目(20090AA011504);国家重大专项"新一代宽带无线移动通信网"(2009ZX03003-008)

摘　　要：本文提出了一种针对存在虚子载波的MIMO OFDM系统下基于均匀分布型的最优导频设计,该设计通过采用时域最小二乘信道估计(TD-LS-CE),且以数据子载波的频域信道响应的均方误差为准则,在最大化带宽效率的前提下,对各发送天线上均匀分布型的导频子载波进行功率最优化分配,并推导了其闭式解。最后,仿真结果表明该最优导频序列在MSE、BER性能方面均优于传统的移相正交导频序列和等功率分配的交错正交导频序列。In this paper, the optimal pilot design for MIMO OFDM system with virtual carrier based on uniformly distributed types is proposed, which adopts an LS channel estimation scheme of time domain, and the power distribution of pilot tones on each transmit antenna is optimized under the criterion of channel response of frequency domain for data subcarriers and maximizing bandwidth efficiency. A closed-form expression for the optimal power distribution of pilot tones is also concluded. Finally, simulations also show that the optimal pilot sequences derived outperform the phase shift ortbogonal pilot sequences and the disjoint orthogonal pilot sequences of the equal power in the performances of the MSE and BER.

关 键 词：MIMO OFDM系统 虚子载波 时域最小二乘信道估计(TD—LS.CE) 导频设计 频域归一化均方误差 (FD.NMSE) 

分 类 号：TN929.53[电子电信—通信与信息系统]