DFT-based Beamforming Weight-Vector Codebook Design for Spatially Correlated Channels in the Unitary Precoding Aided Multiuser Downlink


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. In, ICC 2010, Cape Town, South Africa, 23 - 27 May 2010. (doi:10.1109/ICC.2010.5502350).

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Description/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.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Event Dates: May 23-27, 2010
ISBNs: 9781424464029 (electronic)
ISSNs: 1550-3607 (electronic)
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Comms, Signal Processing & Control
ePrint ID: 271207
Date Deposited: 31 May 2010 18:32
Last Modified: 14 Apr 2014 11:33
Projects:
India-UK advanced technology centre
Funded by: EPSRC (EP/J016640/1)
Led by: Lajos Hanzo
1 January 2012 to 30 June 2014
Further Information:Google Scholar
ISI Citation Count:0
URI: http://eprints.soton.ac.uk/id/eprint/271207

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