2026· IEEE Transactions on Wireless Communications· Vol 25, pp. 20639-20650· 0 citations· 38 references
Computer Science
Abstract
In time-division duplex (TDD) massive multiple-input multiple-output (MIMO) systems, users send pilot sequences for channel state estimation in a fixed time interval, which leads to pilot redundancy if users undergo longer coherence time than the prescribed channel estimation interval, and consequently reduces the net sum spectral efficiency of the systems. In this paper, we propose an adaptive channel estimation scheme for TDD massive MIMO systems, where base stations can reuse the aged channel state information (CSI) by exploiting the temporal correlation inherent in channel aging. We introduce a Fisher transformation method for temporal correlation estimation to determine the CSI estimation interval. We also derive the closed-form expressions of the spectral efficiency with channel aging effect and design a threshold to control the channel aging error introduced by CSI reuse. Numerical results demonstrate that our proposed adaptive scheme yields significant performance gains in spectral efficiency across various communication scenarios.
Stable downlink precoding in time-division duplex (TDD) multi-user multi-input multi-output (MU-MIMO) systems critically depends on the reliability of channel state information (CSI) at the transmitter. In mobile environments, Doppler-induced channel variation, estimation noise, and pilot contamination distort the chan...
L. Bharti, Adarsh Ravi, Hamza Bouchebbah et al.· International Conference on...· 0 citations
A unified comparative analysis of three widely used spatially correlated centralized scattering channel models in a multi-cell massive MIMO system suggests that M-MMSE is preferable in strongly correlated environments, while lower-complexity schemes such as RZF provide a favorable trade-off in scenarios with milder spa...
Waleed A. Ali, M. M. Zayed· Wireless networks· 0 citations
A time-evolving RCE model is developed that characterizes the joint effects of residual phase mismatches, residual carrier frequency offsets, and oscillator phase noise, and a Gauss--Legendre quadrature-based weighted minimum mean square error (WMMSE) optimization framework is developed.
Mingjun Sun, Xi-Dong Mu, Shaochuan Wu et al.· 0 citations
Wideband time-division duplexing (TDD) massive multiple-input multiple-output (MIMO) precoding requires channel state information (CSI) that is both frequency-selective and temporally fresh. In practical fifth-generation New Radio networks, uplink sounding reference signal (SRS) resources are often sparsely allocated a...
Ziqiang Ye, Yuan Zhong, Yulan Gao et al.· IEEE Wireless Communications...· 0 citations
In Orthogonal Time Frequency Space (OTFS) systems, in order to support high-speed mobility and multi-user compatibility, and to reconstruct the entire two-dimensional delay-Doppler (DD) channel response from limited observations in strong interference environments, pilot structures with extensive guard intervals are re...
Xiaotian Li, Zitian Zhao, Jiameng Pei et al.· IEEE Open Journal of the Com...· 0 citations
Massive Multiple-Input Multiple-Output (mMIMO) is a key enabling technology for beyond fifth-generation (B5G) and sixth-generation (6G) wireless systems; however, its performance critically depends on accurate channel state information (CSI). Conventional minimum mean square error (MMSE) channel estimators are typicall...
Muhammad Ahsan Shaikh, S. Rehman, Halar Mustafa· Romanian Journal of Informat...· 0 citations
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