DFT-based Beamforming Weight-Vector Codebook Design for Spatially Correlated Channels in the Unitary Precoding Aided Multiuser Downlink
DFT-based Beamforming Weight-Vector Codebook Design for Spatially Correlated Channels in the Unitary Precoding Aided Multiuser Downlink
Abstract—The DFT-based beamforming weight-vector code-book is considered as an effective design for spatially correlated channels. In this paper, we demonstrate that when the antenna elements are uniformly spaced as well as linearly arranged, and the channels are spatially correlated, the codewords in a DFT-based beaforming weight-vector codebook approximately match the distribution of the optimal beamforming weight-vectors. As a result, the DFT-based codebook is indeed effective. Furthermore, we also demonstrate that if the antenna elements are uniformly spaced and circulary arranged, the statistical distribution of the optimal beamforming weight-vectors becomes different. We will demonstrate that in this scenario the DFT-based codebook will no longer outperform the Grassmannian codebook, which has not been shown in previous studies. Finally, an algorithm is proposed for constructing the DFT-based precoding matrix, which outperforms the conventional algorithm by ensuring the orthogonality of the precoding matrix.
978-1-4244-6402-9
Yang, Du
1f40de97-726c-44ae-be73-eee65346eb12
Yang, Lie-Liang
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
23 May 2010
Yang, Du
1f40de97-726c-44ae-be73-eee65346eb12
Yang, Lie-Liang
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Yang, Du, Yang, Lie-Liang and Hanzo, Lajos
(2010)
DFT-based Beamforming Weight-Vector Codebook Design for Spatially Correlated Channels in the Unitary Precoding Aided Multiuser Downlink.
ICC 2010, Cape Town, South Africa.
23 - 27 May 2010.
(doi:10.1109/ICC.2010.5502350).
Record type:
Conference or Workshop Item
(Paper)
Abstract
Abstract—The DFT-based beamforming weight-vector code-book is considered as an effective design for spatially correlated channels. In this paper, we demonstrate that when the antenna elements are uniformly spaced as well as linearly arranged, and the channels are spatially correlated, the codewords in a DFT-based beaforming weight-vector codebook approximately match the distribution of the optimal beamforming weight-vectors. As a result, the DFT-based codebook is indeed effective. Furthermore, we also demonstrate that if the antenna elements are uniformly spaced and circulary arranged, the statistical distribution of the optimal beamforming weight-vectors becomes different. We will demonstrate that in this scenario the DFT-based codebook will no longer outperform the Grassmannian codebook, which has not been shown in previous studies. Finally, an algorithm is proposed for constructing the DFT-based precoding matrix, which outperforms the conventional algorithm by ensuring the orthogonality of the precoding matrix.
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Published date: 23 May 2010
Additional Information:
Event Dates: May 23-27, 2010
Venue - Dates:
ICC 2010, Cape Town, South Africa, 2010-05-23 - 2010-05-27
Organisations:
Southampton Wireless Group
Identifiers
Local EPrints ID: 271207
URI: http://eprints.soton.ac.uk/id/eprint/271207
ISBN: 978-1-4244-6402-9
PURE UUID: 626c9197-2afa-49e7-980b-6231d95cc451
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Date deposited: 31 May 2010 18:32
Last modified: 18 Mar 2024 02:49
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Contributors
Author:
Du Yang
Author:
Lie-Liang Yang
Author:
Lajos Hanzo
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