基于EM算法的MIMO-OFDM迭代接收机载波频偏估计

Fifth Annual Conference on Communication Networks and Services Research (CNSR '07) Pub Date : 2007-05-14 DOI:10.1109/CNSR.2007.21

S. Salari, M. Ahmadian, M. Ardebilipour, V. Meghdadi, J. Cances

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引用次数: 7

摘要

在本文中，我们考虑了多输入多输出正交频分复用(OFDM)系统中的载波频偏(CFO)估计问题，该系统在发送端使用低密度奇偶校验(LDPC)码，在接收端使用基于最大后验期望最大化(MAP-EM)解调器和软LDPC解码器的迭代检测。在EM算法的基础上，我们首先提出了一种新的基于傅立叶变换(FFT)的快速实现的导频辅助CFO估计器。然后将该CFO估计器集成到迭代接收器的初始化步骤中。实验结果表明，我们设计的接收机在对抗CFO方面是有效的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Carrier-Frequency Offset Estimation via the EM Algorithm for MIMO-OFDM Iterative Receivers

In this paper, we consider carrier-frequency offset (CFO) estimation issue in a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system using low-density parity-check (LDPC) codes at transmitter and iterative detection based on the maximum a posteriori expectation-maximization (MAP-EM) demodulator and a soft LDPC decoder at receiver. Based on the EM algorithm, we first present a novel pilot-aided CFO estimator that allows fast Fourier-transform (FFT)-based fast implementation. Then this CFO estimator is incorporated into the initialization step of the iterative receiver. Experimental results show the effectiveness of our receiver design in combating CFO.

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Fifth Annual Conference on Communication Networks and Services Research (CNSR '07)

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