Non-Uniform Activation Aided Distributed Generalized Spatial Modulation for DMIMO Systems
Abstract
This letter investigates a non-uniform activation aided distributed generalized spatial modulation (DGSM) scheme in a downlink distributed multiple-input multiple-output (DMIMO) system formed by geographically separated transmission reception points (TRPs). Unlike conventional uniform-activation DGSM, the proposed scheme assigns adaptive activation probabilities to different TRP subsets, thereby jointly exploiting the data-domain transmission capability and the index-domain information carried by cooperative subset selection. We derive a mutual-information upper bound under non-uniform activation and formulate a joint activation-probability and power allocation problem subject to a long-term average power constraint. To solve this problem, we develop a semi-closed-form joint probability and power optimization (SC-JPPO) algorithm, where the optimal activation probabilities are shown to follow a Softmax function of the effective utilities. Simulation results demonstrate that the proposed scheme improves spectral efficiency under the same activation scale and power budget compared with existing benchmarks.
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BibTeX
@misc{li2026nonuniform,
title = {{Non-Uniform Activation Aided Distributed Generalized Spatial Modulation for DMIMO Systems}},
author = {Haojin Li and Chen Sun and Rang Su and Zhaojian Liu and Wenqi Zhang and Haijun Zhang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.29915},
eprint = {2609.29915},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.29915},
}
RIS
TY - UNPB
TI - Non-Uniform Activation Aided Distributed Generalized Spatial Modulation for DMIMO Systems
AU - Haojin Li
AU - Chen Sun
AU - Rang Su
AU - Zhaojian Liu
AU - Wenqi Zhang
AU - Haijun Zhang
PY - 2026
DA - 2026/09/24
PB - arXiv
DO - 10.48550/arxiv.2609.29915
UR - https://arxiv.org/abs/2609.29915
AB - This letter investigates a non-uniform activation aided distributed generalized spatial modulation (DGSM) scheme in a downlink distributed multiple-input multiple-output (DMIMO) system formed by geographically separated transmission reception points (TRPs). Unlike conventional uniform-activation DGSM, the proposed scheme assigns adaptive activation probabilities to different TRP subsets, thereby jointly exploiting the data-domain transmission capability and the index-domain information carried by cooperative subset selection. We derive a mutual-information upper bound under non-uniform activation and formulate a joint activation-probability and power allocation problem subject to a long-term average power constraint. To solve this problem, we develop a semi-closed-form joint probability and power optimization (SC-JPPO) algorithm, where the optimal activation probabilities are shown to follow a Softmax function of the effective utilities. Simulation results demonstrate that the proposed scheme improves spectral efficiency under the same activation scale and power budget compared with existing benchmarks.
ER -