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A fixed 4-antenna transmitter architecture is employed to evaluate how varying numbers of receiver antennas impact spatial modulation system performance, with implementation insights for antenna configuration algorithms and performance comparison methodologies.
When achieving 3 bits per symbol (i.e., 3 bit/s/Hz spectral efficiency) in Spatial Modulation (SM) systems, we compare two configurations: 4 transmit antennas with BPSK modulation versus 2 transmit antennas with 4-QAM modulation. This analysis includes implementation considerations such as antenna indexing, constellation mapping, and spectral efficiency calculations.