A Non-Reciprocal Channel Model for THz Asymmetric Massive MIMO Systems

Non-reciprocal antenna beam patterns are promising to be utilized in asymmetric massive multiple-input multiple-output (MIMO) systems for future sixth-generation communications. The inconsistency of uplink (UL) and downlink (DL) channels makes channel modeling in this scenario challenging. In this p...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2024-07, Vol.23 (7), p.7787-7801
Main Authors: Zhang, Kaien, Zhang, Yan, Wang, Cheng-Xiang, Wu, Xiping, Du, Chuan
Format: Article
Language:English
Subjects:
Algorithms
Antenna arrays
Antennas
Arrays
Asymmetric massive multiple-input multiple-output (MIMO) system
Asymmetry
Beams (radiation)
Channel models
Channels
Correlation
geometry-based stochastic model (GBSM)
Massive MIMO
MIMO communication
Molecular absorption
non-reciprocal beam patterns
Ray tracing
Solid modeling
space-time-frequency non-stationarity
Stochastic models
terahertz (THz) channel modeling
Three-dimensional displays
Wireless communication
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Summary:Non-reciprocal antenna beam patterns are promising to be utilized in asymmetric massive multiple-input multiple-output (MIMO) systems for future sixth-generation communications. The inconsistency of uplink (UL) and downlink (DL) channels makes channel modeling in this scenario challenging. In this paper, a novel geometry-based stochastic model (GBSM) is proposed for non-reciprocal terahertz (THz) channels. A directional effective scatterer generation algorithm is designed to depict the inconsistency of bidirectional propagation conditions. The correlation function between UL and DL is derived and analyzed, which validates the ability to characterize the non-reciprocal channels. To mimic THz propagation features, molecular absorption and diffuse scattering are introduced to the model, which is verified by measured data. In addition, the non-stationarities in space, time, and frequency domains are characterized, respectively. Statistical properties are compared between analytical and simulation results, and good agreements are shown. Finally, the accuracy of the model is verified by comparing with the ray tracing data.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2023.3344794