Title: Generalized Precoder Design Formulation and Iterative Algorithm for Spatial Modulation in MIMO Systems With CSIT
Authors: Lee, Ming-Chun
Chung, Wei-Ho
Lee, Ta-Sung
Undergraduate Honors Program of Electrical Engineering and Computer Science
Keywords: Spatial modulation;space shift keying;precoding;CSIT;maximum minimum distance problem
Issue Date: 1-Apr-2015
Abstract: In this paper, we propose two generalized precoder designs to enhance the bit error rates for the general category of spatial modulation (SM) in multiple-input multiple-output (MIMO) systems with channel state information at the transmitter (CSIT). We investigate typical SM-MIMO systems and propose two optimization formulations for designing precoders. Our design rationale for the first formulation is to maximize the minimum Euclidean distance among codewords; for the second formulation, it is to minimize the total signal power for the lower-bounded Euclidean distances among codewords. Since both formulations are non-convex and their optimal solutions are generally intractable, we propose an algorithm that acquires effective solutions by iteratively solving the alternative convex problem linearized and approximated from the original non-convex problem. Discussions on complexity analysis, performance comparisons, design challenges, and robustness in imperfect CSIT are then provided. By generalizing the design formulations, the proposed precoder designs can be extended to generalized SM, which completes the investigation for virtually all SM-type systems. Simulation results show that the proposed designs improve the performance of SM-/GSM-MIMO systems and outperform existing precoding methods with a potentially higher complexity cost.
URI: http://dx.doi.org/10.1109/TCOMM.2015.2396521
ISSN: 0090-6778
DOI: 10.1109/TCOMM.2015.2396521
Volume: 63
Begin Page: 1230
End Page: 1244
Appears in Collections:Articles