Generalized Quaternary Quasi-Orthogonal Sequences Spatial Modulation

Title & Authors
Generalized Quaternary Quasi-Orthogonal Sequences Spatial Modulation
Shang, Yulong; Kim, Hojun; Jung, Taejin;

Abstract
So called quaternary quasi-orthogonal sequence spatial modulation (Q-QOS-SM) has been presented with an advantage of improved throughputs compared to the conventional SM and generalized spatial modulation (GSM) by virtue of a larger set size of QOSs and its minimized correlation value between these QOSs. However the Q-QOS-SM has been originally invented for limited transmit antennas of only powers of two. In this paper, by extending the Q-QOS-SM to any number of transmit antennas, we propose a generalized Q-QOS-SM, referred as G-QO-SM. Unlike the conventional Q-QOS-SM using the Q-QOSs of length of any power of two, the proposed G-QO-SM is constructed based on the Q-QOSs of only the lengths of 2 and 4. The proposed scheme guarantees the transmission of the total $\small{N_t}$ spatial bits with $\small{N_t}$ transmit antennas, and thus achieves greatly higher throughputs than the other existing schemes including the SM, GSM, Q-QOS-SM, Quadrature-SM, and Enhanced-SM. The performance improvements of the proposed G-QO-SM is justified by comparing the analytically derived BER upper bounds and also the exact Monte Carlo simulation results.
Keywords
multiple-input multiple-output;spatial modulation;quaternary quasi-orthogonal sequence;maximum likelihood decoder;Rayleigh fading channel;
Language
English
Cited by
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