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Decision Directed Channel Estimation Aided OFDM Employing Sample-Spaced and Fractionally-Spaced CIR Estimators

Decision Directed Channel Estimation Aided OFDM Employing Sample-Spaced and Fractionally-Spaced CIR Estimators
Decision Directed Channel Estimation Aided OFDM Employing Sample-Spaced and Fractionally-Spaced CIR Estimators
Abstract—In this letter we characterize the substantial difference between two channel estimation approaches, namely the sample-spaced (SS) and the fractionally-spaced (FS) channel impulse response (CIR) estimators. The achievable performance of decision-directed channel estimation (DDCE) methods employing both the SS- and the FS-CIR estimators is analyzed in the context of an OFDM system. The performance of the two estimation methods is compared and it is shown that the DDCE scheme employing the Projection Approximation Subspace Tracking (PAST)-aided FS-CIR estimator outperforms its SS-CIR estimator-based counterpart. Index Terms—Multiuser OFDM, decision directed channel estimation, impulse response estimation SDMA.
1171-1175
Akhtman, Jos
6f612df7-9c17-4351-8340-5171fd174330
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Akhtman, Jos
6f612df7-9c17-4351-8340-5171fd174330
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Akhtman, Jos and Hanzo, Lajos (2007) Decision Directed Channel Estimation Aided OFDM Employing Sample-Spaced and Fractionally-Spaced CIR Estimators. IEEE Transactions on Wireless Communications, 6 (4), 1171-1175.

Record type: Article

Abstract

Abstract—In this letter we characterize the substantial difference between two channel estimation approaches, namely the sample-spaced (SS) and the fractionally-spaced (FS) channel impulse response (CIR) estimators. The achievable performance of decision-directed channel estimation (DDCE) methods employing both the SS- and the FS-CIR estimators is analyzed in the context of an OFDM system. The performance of the two estimation methods is compared and it is shown that the DDCE scheme employing the Projection Approximation Subspace Tracking (PAST)-aided FS-CIR estimator outperforms its SS-CIR estimator-based counterpart. Index Terms—Multiuser OFDM, decision directed channel estimation, impulse response estimation SDMA.

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Published date: April 2007
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 264039
URI: https://eprints.soton.ac.uk/id/eprint/264039
PURE UUID: 3621ff37-5878-4e0f-af24-909a6c826d64
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 22 May 2007
Last modified: 31 Jul 2019 00:53

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