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Hermitian Precoding For Distributed MIMO Systems with Imperfect Channel State Information

E.Sylvia Jeyakumari , V.Kejalakshmi , S.Arivazhagan

A distributive multiple-input multiple output (MIMO) system is taken, in which multiple transmitters co-operatively serve a common receiver under the assumption of imperfect and individual channel state information. Due to practical constraint, in this paper, the individual channel state information is assumed to be imperfect. It leads to performance degradation when compared to a channel with perfect channel knowledge. It is usually very costly to acquire full channel state information at the transmitter (CSIT). In such a case, especially for large-scale antenna systems, it is assumed to have 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 is used for transforming the equivalent channel, including a physical channel and a precoder, into a Hermitian matrix form. The performance analysis and optimization of this Hermitian precoding scheme for an imperfect channel is presented in this paper.