A Low-Complexity Ordered Sphere Decoding Algorithm for Spatial Modulation

Ping YANG  Yue XIAO  Qian TANG  Bin ZHOU  Shaoqian LI  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.7   pp.2494-2497
Publication Date: 2012/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.2494
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
MF,  MIMO,  OSD,  SM,  

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In this letter, an ordered sphere decoding (OSD) algorithm for spatial modulation (SM) is proposed to reduce receiver complexity. The proposed algorithm relies on a developed matched filter (MF), where the initial solution vector is obtained and the transmit-antenna set is sorted, so as to perform a fast tree search. Furthermore, a threshold parameter is introduced to balance the tradeoff between complexity and performance. Simulation results show that the proposed SM-OSD algorithm achieves considerable complexity reduction compared to the SM-SD, especially in unbalanced multiple-input multiple output (MIMO) channels.