Improved Low-Complexity Sphere Decoding for Generalized Spatial Modulation - 2018


During this letter, two types of improved sphere decoding (SD) algorithms for generalized spatial modulation (GSM), termed the tree search SD (T-SD) and the path search SD (P-SD), are proposed to supply larger complexity reduction compared with the conventional SD algorithms by merging the repeating elements of the vectors. Simulation results show that the proposed T-SD and P-SD can scale back the complexity dramatically while maintaining the optimum bit-error-ratio performance, particularly for top spectral efficiency GSM. Furthermore, P-SD breaks the limitation on the number of transmit antennas and receive antennas.

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