基于最佳屏蔽序列偶的OFDM信道估计  

Channel estimation using PPBSP for OFDM systems

作　　者：施炯[1,2] 蒋挺[1] 周正[1] 

机构地区：[1]北京邮电大学泛网无线通信教育部重点实验室,北京100876 [2]浙江万里学院宁波市DSP重点实验室,宁波315100

出　　处：《高技术通讯》2011年第8期797-802,共6页Chinese High Technology Letters

基　　金：863计划（2009AA012262）;国家自然科学基金（60772021）和国家科技重大专项（2009zX03006-D06,2009ZX03006-009）资助项目.

摘　　要：利用最佳屏蔽二进序列偶（PPBSP）良好的循环自相关特性，提出了一种基于PPBSP的OFDM信道估计方法。该方法在发送端，间隔一定数量的OFDM符号后，插入最佳屏蔽序列偶的原序列作为时域训练序列；在接收端，将屏蔽序列作为本地接收序列，计算归一化互相关函数。通过对信道时域冲激响应（CIR）的估计，得到OFDM各个子信道的频率响应（CFR）估计。算法分析和仿真测试表明，与传统的m序列方式相比，该方法在兼顾系统开销和计算复杂度的情况下，能够更好地提高系统性能。Based on the good auto-correlation property of perfect punctured binary sequence pairs （PPBSP） , a new time- domain channel estimation algorithm for orthogonal frequency division multiplexing （OFDM） systems is proposed. The algorithm inserts the original sequence of PPBSP among OFDM symbols as the time-domain training sequence, and calculates the normalized cross-correlation matrix between the received sequence and the punctured sequence of PPBSP. Using the estimation of channel impulse response （ CIR）, it achieves the estimation of channel frequency response （CFR）. The results of the algorithm＇ s analysis and simulation show that compared with the traditional m- sequence method, the proposed algorithm can improve the system performance more efficiently with the lower over- head and the lower computational complexity.

关 键 词：最佳屏蔽二进序列偶(PPBSP) 信道估计 最小均方误差 正交频分复用(OFDM) 

分 类 号：TN929.533[电子电信—通信与信息系统]