Channel Estimation for TDD/FDD Massive MIMO Systems With Channel Covariance Computing

In this paper, we propose a new channel estimation scheme for TDD/FDD massive MIMO systems by reconstructing (sometimes also referred to as covariance computing or covariance fitting) uplink/downlink channel covariance matrices (CCMs) with the aid of array signal processing techniques. Specifically,...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2018-06, Vol.17 (6), p.4206-4218
Main Authors: Xie, Hongxiang, Gao, Feifei, Jin, Shi, Fang, Jun, Liang, Ying-Chang
Format: Article
Language:English
Subjects:
angle reciprocity
Antenna arrays
Array signal processing
channel covariance reconstruction
Channel estimation
Downlink
Manganese
Massive MIMO
MIMO communication
PAS reciprocity
Uplink
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Summary:In this paper, we propose a new channel estimation scheme for TDD/FDD massive MIMO systems by reconstructing (sometimes also referred to as covariance computing or covariance fitting) uplink/downlink channel covariance matrices (CCMs) with the aid of array signal processing techniques. Specifically, the angle parameters and power angular spectrum (PAS) of channel are extracted from the instantaneous uplink channel state information (CSI). Then, the uplink CCM is reconstructed and can be used to improve the uplink channel estimation without any additional training cost. By virtue of angle reciprocity as well as PAS reciprocity between uplink and downlink channels, the downlink CCM could also be inferred with a similar approach even for the FDD massive MIMO systems. Then, the downlink instantaneous CSI can be obtained by training toward the dominant eigen-directions of each user. The proposed strategy is applicable to various PAS distributions. Numerical results are provided to demonstrate the superiority of the proposed methods over the existing ones.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2018.2821667