上行OFDMA系统快速盲信道估计  

Fast Blind Channel Estimation for Uplink OFDMA Systems

作　　者：周游[1] 胡捍英[1] 

机构地区：[1]解放军信息工程大学,河南省郑州市450002

出　　处：《信号处理》2014年第1期37-43,共7页Journal of Signal Processing

基　　金：国家高技术研究发展计划(2012AA01A502;2012AA01A505)

摘　　要：信道估计直接影响正交频分多址接入(OFDMA)系统的性能,为了提升多用户盲信道估计精度和收敛速度,提出一种快速盲信道估计算法。该算法通过叠加多个接收天线上的频域数据建立子空间,然后利用子空间之间的正交性完成多用户信道频域响应的盲估计,并通过抽样分段进一步提升算法的估计精度和收敛速度。算法不受多用户子载波分配规则的限制,也不依赖于虚拟子载波,且降低了对多用户定时同步的要求。仿真结果表明,与已有算法相比,该算法具有较好的收敛性能和较快的收敛速度,且对信道阶数具有鲁棒性。Channel estimation has a great impact on the performance of OFDMA systems. In order to improve the accura- cy and accelerate the multi-user＇ s channel estimation, a fast blind channel estimation algorithm is proposed. The received data from multi-antennas in the frequency domain is piled up, and the subspaee is built whose orthogonality is exploited to blindly estimate the frequency channel response. The a~~racy and convergence rate are further improved through a sam- piing method. The algorithm is not limited to the subcarrier allocation scheme, and independent to the virtual subcarriers. Moreover, it has a low requirement on the timing of multi-user. Simulations show that the algorithm effectively improves the convergence rate while keeping a considerable performance compared with that of existed one, and it＇ s insensitive to the channel order.

关 键 词：正交频分多址接入 盲信道估计 子空间 抽样估计 

分 类 号：TN929.5[电子电信—通信与信息系统]