Massive MIMO-OFDM Channel Acquisition with Time-Frequency Phase-Shifted Pilots
Date
2024-11-27
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE Transactions on Communications
Abstract
In this paper, we propose a channel acquisition approach with time-frequency phase-shifted pilots (TFPSPs) for massive multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. We first present a triple-beam (TB) based channel tensor model, allowing for the representation of the space-frequency-time (SFT) domain channel as the product of beam matrices and the TB domain channel tensor. By leveraging the specific characteristics of TB domain channels, we develop TFPSPs, where distinct pilot signals are simultaneously transmitted in the frequency and time domains. Then, we present the optimal TFPSP design and provide the corresponding pilot scheduling algorithm. Further, we propose a tensor-based information geometry approach (IGA) to estimate the TB domain channel tensors. Leveraging the specific structure of beam matrices and the properties of TFPSPs, we propose a low-complexity implementation of the tensor-based IGA. We validate the efficiency of our proposed channel acquisition approach through extensive simulations. Simulation results demonstrate the superior performance of our approach. The proposed approach can effectively suppress inter-UT interference with low complexity and limited pilot overhead, thereby enhancing channel estimation performance. Particularly in scenarios with a large number of UTs, the channel acquisition method outperforms existing approaches by reducing the normalized mean square error (NMSE) by more than 8 dB.
Description
This article was originally published in IEEE Transactions on Communications. The version of record is available at: https://doi.org/10.1109/TCOMM.2024.3506945.
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Keywords
massive MIMO-OFDM, TB-based channel tensor model, time-frequency phase-shifted pilot, pilot scheduling, channel estimation
Citation
J. Tang et al., "Massive MIMO-OFDM Channel Acquisition with Time-Frequency Phase-Shifted Pilots," in IEEE Transactions on Communications, doi: 10.1109/TCOMM.2024.3506945.