Abstract
This paper explores the optimal number of antennas within generalized spatial modulation (GSM) scheme with single and multiple radio frequency (RF) chains. The main focus of our work is on the number of total transmit antennas and active transmit antennas as per the GSM transmission, that optimizes the system's power efficiency. Accordingly, the bandwidth efficiency of the transmission and receiver complexity are analytically calculated. The performance of the multiple-RF-chain GSM scheme is compared with SM and GSM. Moreover, Monte Carlo simulations are carried out to analyze and verify the analysis of power efficiency as a function of the number of transmit antennas.
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