使用接收分集的确定性OFDM盲信道估计算法

Deterministic Blind OFDM Channel Estimation Using Receiver Diversity

本文针对无循环前缀的OFDM系统研究了非数据辅助的信道估计方法.借助于2个接收天线实现的信道分集,提出了一个确定性信道盲估计算法,并给出了信道可辨识性条件.该算法使用1个OFDM块便可在一个标量模糊因子的意义上确定信道冲激响应.算法计算量小,而且对输入信号的星座和统计特性没有约束.仿真结果证实了算法的有效性.

In this paper, we investigate non data-aided channel estimation for orthogonal frequency division multiplexing （OFDM） systems without cyclic prefix. By exploiting channel diversity using only two receive antermas, a blind deterministic algorithm is proposed. [dentifiability conditions are derived that guarantee the channel to be identified up to a scalar ambiguity. This diversitybased algorithm is computationally efficient and does not have any restriction on the input symbols with regard to their constellation or their statistical properties. Simulation results illustrate the performance of the proposed algorithm.