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Error performance analysis of generalized quadrature spatial modulation using H-8QAM
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Journal Article
Error performance analysis of generalized quadrature spatial modulation using H-8QAM
2022
Overview
Motivated to enhance the error performance (
EP
) of generalised complex quadrature spatial modulation (GCQSM) systems, this study proposes a scheme that builds on GCQSM and uses hexagonal quadrature amplitude modulation (H-QAM) constellations which have the advantages of a maximised Euclidean distance with relatively low peak-to-average power ratio, compared to conventional QAM (C-QAM) systems. This in turn, leads to an enhancement of the
EP
of GCQSM schemes. The proposed scheme utilises a rotated hexagonal 8QAM (H-8QAM) set. Thus, the proposed scheme is herein named; Generalised QSM using H-8QAM (GQSM-H-8QAM). In this study, the
EP
of the proposed GQSM-H-8QAM scheme is investigated over Rayleigh frequency flat-fading channels with additive white Gaussian noise. Additionally, a theoretical average bit error probability (
ABEP
) expression of the GQSM-H-8QAM scheme is formulated and validated using Monte Carlo simulations. Compared to simulation results, the
ABEP
proves to be increasingly tight at high signal-to-noise ratio values. Obtained simulation results also show an improvement in the
EP
of the GQSM-H-8QAM scheme over various SM schemes like GCQSM, C-QSM and conventional-generalized spatial modulation (C-GSM), at the same spectral efficiency (
SE
). An improvement in the
EP
of 0.61 dB with
SE
of 8 bits/s/Hz is seen in
4
×
4
GQSM-H-8QAM over
4
×
4
GCQSM using C-8QAM, 2.58 dB over
4
×
4
C-QSM-C-64QAM and a gain of 4.85 dB over
4
×
4
C-GSM-C-64QAM.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
