B. S. Thian, H. D. Nguyen and S. Sun, "Statistical Precoding for MIMO Systems With Channel Estimation Errors," in IEEE Wireless Communications Letters, vol. 4, no. 1, pp. 62-65, Feb. 2015. doi: 10.1109/LWC.2014.2368570
Obtaining accurate instantaneous channel state information (CSI) is challenging for multiple-input–multiple-output (MIMO) systems, particularly if the channel ﬂuctuates rapidly. A more practical assumption is statistical CSI as the channel statistics are likely to remain unchanged for a longer period. In this letter, we propose a precoder design, using only statistical CSI, to minimize error probability for practical MIMO systems with channel estimation errors. Our proposed precoder design is shown to achieve a signiﬁcant improvement in error performance when compared with other precoding schemes in literature. For example, for a real 4 × 4 MIMO system with BPSK modulation and at a codeword error rate of 10−3, coding gains of up to 12 dB can be achieved
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