A new approach to alleviate the gain imbalance of parallel subchannels for MIMO systems

Authors:
Feng Liu;Yi Wang;Hui Shen;Bin Li
Affiliations:
Huawei Shanghai Research Institute, Shanghai, China;Huawei Shanghai Research Institute, Shanghai, China;Huawei Shanghai Research Institute, Shanghai, China;Huawei Shanghai Research Institute, Shanghai, China
Venue:
APCC'09 Proceedings of the 15th Asia-Pacific conference on Communications
Year:
2009

Citing 1
Cited 0

On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas

Wireless Personal Communications: An International Journal

Quantified Score

Hi-index	0.00

Visualization

Abstract

Eliminating the interferences among antennas is the first issue for effectively utilizing the spatial degree of freedoms of multiple-input multiple-output (MIMO) systems. Singular value decomposition (SVD) method plays an important role for interference elimination through a joint transceiver way, where the singular vectors are often used for linear unitary precoding (UP). However, directly applying SVD to the channel matrix suffers from subchannel-gain imbalance. In this paper, a new approach is proposed based on the lattice reduction (LR) method to alleviate such an imbalance problem. We apply SVD to the LLL-reduced channel matrix and obtain the new unitary precoding matrix. The additional complexity is negligible for long-block transmission. Numerical results show that the proposed scheme can outperform the conventional one for uncoded systems and coded systems.