Wu, YongpengWing Kwan Ng, DerrickWen, Chao-KaiSchober, RobertLozano Solsona, Angel2019-04-082019-04-082017Wu Y, Wing Kwan Ng D, Wen CK, Schober R, Lozano A. Low-complexity MIMO precoding for finite-alphabet signals. IEEE Trans Wirel Commun. 2017 Jul;16(7):4571-84. DOI: 10.1109/TWC.2017.27003081536-1276http://hdl.handle.net/10230/37061This paper investigates the design of precoders for single-user multiple-input multiple-output (MIMO) channels, and, in particular, for finite-alphabet signals. Based on an asymptotic expression for the mutual information of channels exhibiting line-of-sight components and rather general antenna correlations, precoding structures that decompose the general channel into a set of parallel subchannel pairs are proposed. Then, a low-complexity iterative algorithm is devised to maximize the sum mutual information of all pairs. The proposed algorithm significantly reduces the computational load of existing approaches with only minimal loss in performance. The complexity savings increase with the number of transmit antennas and with the cardinality of the signal alphabet, making it possible to support values thereof that were unmanageable with existing solutions. Most importantly, the proposed solution does not require instantaneous channel state information (CSI) at the transmitter, but only statistical CSI.application/pdfeng© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. http://dx.doi.org/10.1109/TWC.2017.2700308info:eu-repo/semantics/articlehttp://dx.doi.org/10.1109/TWC.2017.2700308Finite alphabet inputsLinear precodingMultiple-input multiple-outputReplica methodMIMOinfo:eu-repo/semantics/openAccess