The Impact of Imperfect Channel State Information on QRD-Based Precoded MIMO-OFDM System

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Executive Summary

A new closed-loop precoding method has been proposed for MIMO-OFDM systems with limited feedback by using the QR decomposition to the time-domain channel impulse response matrix. In contrast to the other methods where the receiver has to feed back full precoder index of each subcarrier or reduced index for a group of subcarriers to the transmitter, the GMD-based scheme can substantially reduce the amount of feedback information by returning only one precoder index to the transmitter, regardless of the number of subcarriers and channels.

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