Norm‑based user selection algorithm for single‑RF space modulation techniques with geometric mean decomposition based precoding scheme

摘要

Joint user selection algorithm and fully digital geometric mean decomposition (GMD)-based precoding scheme is consideredin this paper for single radio frequency (RF) space modulation techniques (SMTs), namely, spatial modulation(SM) and space shift keying (SSK) schemes. The objective is to jointly perform the Frobenius norm-based user selectionalgorithm and design GMD-based precoded SMTs with single-RF chain in order to reduce the cost and the power consumptionin multiple input multiple output (MIMO) systems, and to avoid the complicated bit-allocation problem ofsingular value decomposition (SVD)-based precoding technique. Based on these schemes, the GMD-based precodingtransmission carried out in the context of a single-user SMTs can readily be extended to the multi-user (MU) case. Simulationresults demonstrate that single-RF SMTs with GMD-based precoding scheme is capable of outperforming SMTswith SVD-based precoding technique. Meanwhile, MU-SMTs with GMD-based precoding scheme provide significantperformance gains over the conventional SM- and SSK-MIMO counterparts and single-user SMTs with GMD-based precodingalgorithm, which increase the energy efficiency and the reachability using these schemes. Furthermore, bettererror performance in MU-SMTs with fully digital GMD-based precoding technique is obtained by selecting any numberof users. Therefore, MU-SMTs with GMD-based precoding scheme can be effectively used in various 5G wireless networks.