4天线连续相位调制信道参数估计算法  

Channel state information estimator of MIMO-CPM system with four transmit antennas

作　　者：陈沪东[1] 赵民建[1] 沈文丽[1] 林科[1] 仇佩亮[1] 

机构地区：[1]浙江大学信息与电子工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2009年第2期234-239,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(60602023)

摘　　要：针对准静态瑞利衰落信道提出了一种适用于4天线连续相位调制(CPM)的信道参数估计算法.算法通过改进空时编码算法的辅助矩阵,实现了相位归零的CPM训练序列设计,适用于OSTC-CPM、OSTBC-CPM等4天线CPM系统.提出了采用部分采样点估计和部分矩形(-αREC)成形函数相结合的方法.仿真结果表明,在获得相同性能条件下,"0"采样点估计方法能够有效抵抗1/2采样周期的定时误差;全采样点估计方法可以减少训练序列长度;部分采样点估计和-αREC成形函数结合方法,既可以减少训练序列长度,又可以有效抵抗2倍采样周期的定时误差.在训练序列长度为16编码块、8倍采样率条件下,与理想信道状态信息(CSI)相比,OSTC-CPM、OSTBC-CPM系统的误比特性能差距均小于0.3 dB.This work proposed a channel estimator for the multi-input multi-output continuous phase modulation （MIMO-CPM） system over quasi-static Rayleigh fading channels. The estimation algorithm improves the existing data aided array and designs a training sequence whose phase back to zero within two blocks. The algorithm can be used for the four transmit antennas systems based on CPM, such as orthogonal space time code-CPM （OSTC-CPM） and orthogonal space time block code-CPM （OSTBC-CPM）. An estimator with partial-sampled points and partial rectangle （α-REC） shaping filter were provided. Simula- tion shows that the 0-sampled point method can resist the timing estimate error （TEE） of 1/2 period of sample time, the full-sampled points method can shorten the training sequence, while the partial-sampled points and α-REC shaping filter function can resist 2Ts TEE with shorter training sequence. The bit error rate （BER） loss of the proposed estimator, whose training sequence length is 16 blocks and sample rate is 8, is less than 0.3 dB compared with the ideal channel state information （CSI） over OSTC-CPM and OSTBC-CPM systems.

关 键 词：信道状态信息(CSI) 多输人多输出(MIMO) 连续相位调制(CPM) 正交空时编码(OSTC) 正交空时分组编码(0STBC) 

分 类 号：TN929.5[电子电信—通信与信息系统]