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Wireless Networks
Published in: Wireless Networks 2/2013

01-02-2013

Effective channel control random beamforming for single user MIMO systems

Authors: Hojae Lee, Jongrok Park, Hyukmin Son, Sanghoon Lee

Published in: Wireless Networks | Issue 2/2013

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Abstract

In general, it has been demonstrated that the performance of conventional random beamforming (RBF) approaches that of ideal eigen beamforming when the number of users is large in a cell by exploiting multi-user diversity. However, if the number of users decreases, such as femto or pico cell in the 3GPP Long Term Evolution-Advanced standard, the performance degradation occurs in the RBF scheme due to the lack of multi-user diversity. In this paper, we present a novel precoder based on singular value decomposition (SVD) using feedback of weight values in an RBF environment. For achieving performance improvement in the femto cell environment, we generate a precoding matrix appropriate to user channel by controlling the feedback values with an equivalent feedback quantity. In the simulation results, we verify the outstanding performance of the proposed scheme for a small number of users.
previous article Directional routing and scheduling for green vehicular delay tolerant networks
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Appendix
Available only for authorised users
Footnotes
1
To maximize link capacity, we allocate the total power to the first beam. Here, we define this allocation as the MSPA. In general, for a small number of users, such as 3GPP LTE-A, the interference between beamforming vectors of a selected user becomes large. Thus, it has been demonstrated that a better performance can be achieved by allocating the total transmit power to a single beam than other power allocation schemes [4, 7].
 
2
If so many users are taken into account, the tendency would be changed. However, in this paper, the proposed scheme is not designed for such large number of users.
 
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Metadata
Title
Effective channel control random beamforming for single user MIMO systems
Authors
Hojae Lee
Jongrok Park
Hyukmin Son
Sanghoon Lee
Publication date
01-02-2013
Publisher
Springer US
Published in
Wireless Networks / Issue 2/2013
Print ISSN: 1022-0038
Electronic ISSN: 1572-8196
DOI
https://doi.org/10.1007/s11276-012-0458-8

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