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Preceding Scheme for Dual Spatial Multiplexing Systems with Limited Feedback  

Lee, Myoung-Won (Department of Electrical and Electronic Engineering, Yonsei University)
Mun, Cheol (Department of Electronic Communication Engineering, ChungJu National University)
Yook, Jong-Gwan (Department of Electrical and Electronic Engineering, Yonsei University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.17, no.12, 2006 , pp. 1224-1230 More about this Journal
Abstract
In this paper, for spatial multiplexing with limited feedback, a precoding scheme is proposed based on the joint use of minimal instantaneous feedback and long-term feedback of a small number of bits, wherein the long-term feedback is used to convey a selected preceding matrix within a precodercodebook consisting of a number of unitary matrices, and the active column vectors of the selected unitary matrix are conveyed to the transmitter using instantaneous feedback. Focusing on the case of dual multi-input multi-output(MIMO) systems, precoder codebook design for maximizing the average throughput of a spatial multiplexing system with a zero-forcing(ZF) receiver is proposed. It is shown that the proposed scheme provides a considerable throughput enhancement over multi-mode antenna selection and multi-mode basis selection only with the additional long-yterm feedback of a small number of bits. For example, the throughput increases by 11.5 % than antenna selection and 5.1% than basis selection, respectively, when SNR=20 dB.
Keywords
MIMO Systems; Spatial Multiplexing; Linear Preceding; Limited Feedback; Precoder Codebook;
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