Fully-Quadrature Spatial Modulation Over Rician Fading Channels

Abstract

Space modulation techniques (SMTs) are promising multiple-input multiple-output (MIMO) schemes that draw an intriguing attention lately due to their superior performance enhancement in terms of energy efficiency, spectral efficiency, and unpretentious receiver's complexity. In the SMTs, the indices of the building blocks of the communication system are harnessed in an innovative way to embed an additional information. As such, the SMTs use the transmit antenna indices to fulfill higher transmission efficiency than the other MIMO opponents. Although of their appealing advantages, the SMTs suffer from a main disadvantage which is represented in the logarithmic proportion between their achievable data rates and the number of the transmit antennas. Therefore, the authors proposed the fully-quadrature spatial modulation (F -QSM) in order to vanquish the main disadvantage of the SMTs. In the F -QSM, the transmit antenna indices are varied in an innovative way to achieve a linear proportion between the achievable data rate and the number of the transmit antennas. In this paper, the performance of the F-QSM is investigated over Rician fading channel. The average bit error rate performance (ABER) of the F -QSM is assessed and weighted against the ABER of the conventional SMTs under different values of Rician factor. Furthermore, the computational complexity of the F -QSM is obtained as well and weighted against the computational complexity of the conventional SMTs. The conducted Monte-Carlo simulations substantiate the outweighing of the proposed scheme in terms of achievable data rate and ABER performance but at the expense of a slight increase in the computational complexity compared to the conventional SMTs.