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Phase-shifter-aided Generalized Spatial Modulation with Low-Complexity Detection
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DOI：10.1109/lcomm.2026.3743768.png)
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Abstract
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A phase-shifter-aided generalized spatial modulation (PS-GSM) scheme is proposed, where phase shifters are exploited as an additional dimension to convey information. By jointly utilizing antenna indices and phase-domain symbols, the proposed scheme enhances the effective multiplexing capability without increasing the number of radio frequency (RF) chains. To facilitate practical implementation, a low-complexity linear-assisted maximum likelihood (LA-ML) detector is developed, which reduces the exhaustive search space while maintaining near-optimal performance. Numerical results demonstrate that the proposed PS-GSM scheme significantly outperforms conventional spatial modulation (SM) and related phase-shifteraided spatial multiplexing (PSSM) benchmarks at the same transmission rate, achieving a favorable trade-off between error and complexity.
Keywords:
Generalized spatial modulation (GSM)
phase-shifter-aided spatial multiplexing (PSSM)
multiple-input–multiple-output (MIMO)
low-complexity detector
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