Journal
IET COMMUNICATIONS
Volume 15, Issue 16, Pages 2046-2053Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/cmu2.12237
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Funding
- National Natural Science Foundation of China [61771202, 62071504, U1809211]
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ESM-GAS is a proposed enhanced spatial modulation method for multiple-input single-output systems, which introduces the concept of equivalent antennas and selects candidate equivalent antennas to achieve flexible active antenna numbers and improved bit error ratio performance.
Here, an enhanced spatial modulation with generalized antenna selection (ESM-GAS) for multiple-input single-output systems is proposed. Unlike the conventional SM systems, in ESM-GAS, the number of active antennas is not fixed, but varies from only one to all. In ESM-GAS, a concept called equivalent antennas is introduced to describe the status of the antennas. Out of all the available equivalent antennas, a subset is selected as the candidate antennas for SM, in which additional information bits are used to determine the indices of the activated equivalent antennas. Two criteria are used to select the candidate equivalent antennas. One is ESM-GAS, where a part of candidate equivalent antennas with larger channel power gains are selected with low computational complexity. To further improve the bit error ratio (BER) performance of ESM-GAS, the other one is a combination scheme of Euclidean distance antenna selection (EDAS) and ESM-GAS (ESM-GAS-EDAS). Simulation results show that ESM-GAS has better BER performance than conventional SM, and ESM-GAS-EDAS outperforms conventional SM, EDAS-based SM, and ESM-GAS, which verifies the effectiveness of the proposed schemes.
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