Joint Decision-Directed Channel and Noise-Variance Estimation for MIMO OFDM/SDMA Systems Based on Expectation-Conditional Maximization
Joint Decision-Directed Channel and Noise-Variance Estimation for MIMO OFDM/SDMA Systems Based on Expectation-Conditional Maximization
A joint channel impulse response (CIR) and noise-variance estimation scheme is proposed for multiuser multiple-input–multiple-output (MIMO) orthogonal frequency-division multiplexing/space-division multiple access (OFDM/SDMA) systems, which is based on the expectation-conditional maximization (ECM) algorithm. Multiple users communicating over fading channels exhibiting a range of different characteristics are considered in this paper. Channel estimation becomes quite challenging in this scenario since an increased number of independent transmitter–receiver links having different statistical characteristics have to be simultaneously estimated for each subcarrier. To cope with this scenario, we design an ECM-based joint CIR and noise-variance estimator for multiuser MIMO OFDM/SDMA systems, which is capable of simultaneously estimating diverse CIRs and noise variance. Furthermore, we propose a forward error code (FEC)-aided decision-directed channel estimation scheme based on the ECM algorithm, which further improves the ECM algorithm by exploiting the error correction capability of an FEC decoder for iteratively exchanging information between the decoder and the ECM algorithm.
2139-2151
Zhang, Jiankang
6add829f-d955-40ca-8214-27a039defc8a
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Mu, Xiaomin
3d578909-36ba-4b16-b703-2ef63532116c
20 June 2011
Zhang, Jiankang
6add829f-d955-40ca-8214-27a039defc8a
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Mu, Xiaomin
3d578909-36ba-4b16-b703-2ef63532116c
Zhang, Jiankang, Hanzo, Lajos and Mu, Xiaomin
(2011)
Joint Decision-Directed Channel and Noise-Variance Estimation for MIMO OFDM/SDMA Systems Based on Expectation-Conditional Maximization.
IEEE Transactions on Vehicular Technology, 60 (5), .
Abstract
A joint channel impulse response (CIR) and noise-variance estimation scheme is proposed for multiuser multiple-input–multiple-output (MIMO) orthogonal frequency-division multiplexing/space-division multiple access (OFDM/SDMA) systems, which is based on the expectation-conditional maximization (ECM) algorithm. Multiple users communicating over fading channels exhibiting a range of different characteristics are considered in this paper. Channel estimation becomes quite challenging in this scenario since an increased number of independent transmitter–receiver links having different statistical characteristics have to be simultaneously estimated for each subcarrier. To cope with this scenario, we design an ECM-based joint CIR and noise-variance estimator for multiuser MIMO OFDM/SDMA systems, which is capable of simultaneously estimating diverse CIRs and noise variance. Furthermore, we propose a forward error code (FEC)-aided decision-directed channel estimation scheme based on the ECM algorithm, which further improves the ECM algorithm by exploiting the error correction capability of an FEC decoder for iteratively exchanging information between the decoder and the ECM algorithm.
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Published date: 20 June 2011
Organisations:
Southampton Wireless Group
Identifiers
Local EPrints ID: 272510
URI: http://eprints.soton.ac.uk/id/eprint/272510
ISSN: 0018-9545
PURE UUID: ad50bb85-a4ea-4d43-8cb7-c80b426bc0fe
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Date deposited: 23 Jun 2011 10:27
Last modified: 18 Mar 2024 03:14
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Contributors
Author:
Jiankang Zhang
Author:
Lajos Hanzo
Author:
Xiaomin Mu
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