Yang, Du, Yang, Lie-Liang and Hanzo, Lajos
DFT-based Beamforming Weight-Vector Codebook Design for Spatially Correlated Channels in the Unitary Precoding Aided Multiuser Downlink
At ICC 2010, South Africa.
23 - 27 May 2010.
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.
Conference or Workshop Item
|Digital Object Identifier (DOI):
||Event Dates: May 23-27, 2010
|Venue - Dates:
||ICC 2010, South Africa, 2010-05-23 - 2010-05-27
||Southampton Wireless Group
|23 May 2010||Published|
||31 May 2010 18:32
||17 Apr 2017 18:20
|Further Information:||Google Scholar|
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