Joint Carrier Frequency Offset and Channel Tracking for MU-MIMO-OFDM Uplink Systems

WANG Xu; HE Fan; FENG Hui; YANG Tao; HU Bo

doi:10.3969/j.issn.0372-2112.2014.07.002

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Joint Carrier Frequency Offset and Channel Tracking for MU-MIMO-OFDM Uplink Systems

更新时间：2025-07-16

- Joint Carrier Frequency Offset and Channel Tracking for MU-MIMO-OFDM Uplink Systems
- Acta Electronica Sinica Vol. 42, Issue 7, Pages: 1256-1261(2014)
- 作者机构：
  
  复旦大学,上海,200433
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China (No.60972024);National Science and Technology Major Project (No.2012ZX03001007-003, No.2013ZX03003006-003)
- DOI：10.3969/j.issn.0372-2112.2014.07.002
  CLC： TN911.3
- Published：2014
- 稿件说明：
移动端阅览
WANG Xu, HE Fan, FENG Hui, et al. Joint Carrier Frequency Offset and Channel Tracking for MU-MIMO-OFDM Uplink Systems[J]. Acta Electronica Sinica, 2014, 42(7): 1256-1261.
DOI：

WANG Xu, HE Fan, FENG Hui, et al. Joint Carrier Frequency Offset and Channel Tracking for MU-MIMO-OFDM Uplink Systems[J]. Acta Electronica Sinica, 2014, 42(7): 1256-1261. DOI： 10.3969/j.issn.0372-2112.2014.07.002.

摘要

本文提出了一种在MU-MIMO-OFDM （Multiple-User Multiple-Input-Multiple-Output Orthogonal-Frequency-Division-Multiplexing）上行链路中，联合跟踪残留频偏（Residual Carrier Frequency Offset，RCFO）和信道的算法.本算法采用EM （Expectation Maximization）方法求解该非线性问题，并使用变分推断来近似原来复杂的隐变量的后验概率.在估计RCFO时，考虑了信道估计误差的概率分布，从而降低了信道估计误差对跟踪性能的影响.仿真中，本算法达到了较高的跟踪精度，尤其是在高信噪比时没有误差平台问题.

Abstract

A joint carrier frequency offset (CFO) and channel tracking method for multiple-user multiple-input-multiple-output orthogonal-frequency-division-multiplexing (MU-MIMO-OFDM) uplink systems is proposed in this paper.We use the expectation maximization (EM) algorithm to solve the nonlinear problem

and use variational inference to approximate the posterior distribution of the latent variable.Besides

to reduce the impact of channel estimation deviation

we consider its distribution when estimating the RCFO.Simulation results show that the proposed algorithm obtains high tracking accuracy

and there is no error floor problem in the high SNR region.

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