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Hermitian Precoding for Distributed MIMO Systems with Individual Channel State Information

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3 Author(s)
Jianwen Zhang ; Department of Electronic Engineering, City University of Hong Kong, Hong Kong SAR, China ; Xiaojun Yuan ; Li Ping

We consider a distributed multiple-input multiple-output (MIMO) system in which multiple transmitters cooperatively serve a common receiver. It is usually very costly to acquire full channel state information at the transmitter (CSIT) in such a scenario, especially for large-scale antenna systems. In this paper, we assume individual CSIT (I-CSIT), i.e., each transmitter has perfect CSI of its own link but only slow fading factors of the others. A linear Hermitian precoding technique is proposed to enhance the system performance. The optimality of the proposed precoding technique is analyzed. Numerical results demonstrate that the performance loss incurred by the I-CSIT assumption is negligible as compared to the full-CSIT case.

Published in:

IEEE Journal on Selected Areas in Communications  (Volume:31 ,  Issue: 2 )