Abstract
In this paper, we investigate the performance of a device-to-device (D2D) multiple-input and multiple-output (MIMO) communications using an amplify-and-forward relaying for various energy-efficient modulation schemes. For analysis, transmit antenna selection strategy is employed at the transmitter to select the best transmit antenna which maximizes the received signal power. In the analysis, we optimized the relay location to obtain the lowest outage probability possible and derived the generalized upper-bound average symbol error rate expressions of energy-efficient futuristic modulation schemes such as square quadrature amplitude modulation (QAM), rectangular QAM, cross QAM, and hexagonal QAM for D2D network. Further, we have derived the ergodic capacity expression to calculate the achievable rates. Comparative analysis of different QAM schemes for various constellation orders is also presented. Furthermore, the impact of the relative position of relay, path loss, and the number of antennas are also highlighted. Finally, the derived analytical results are verified through Monte-Carlo simulations.
Highlights
Device-to-device (D2D) communication is considered as a promising solution to enhance the spectral efficiency of the wireless networks by facilitating the physical proximity of nearby active devices [1]
In [31], authors have analyzed the performance of dual-hop cooperative multiple-input and multiple-output (MIMO) relay system by employing transmit antenna selection (TAS) strategies over Nakagami-m channels and the average symbol error rate (ASER) expression of binary phase-shift keying (BPSK) scheme is derived
An indepth analysis of the ASER of the higher-order modulation schemes such as HQAM, rectangular QAM (RQAM), XQAM, and square QAM (SQAM) for MIMO systems along with the system performance metrics like outage probability, ergodic capacity and the system geometric location are conducted for the first time in literature and is primarily novelty of this work
Summary
Device-to-device (D2D) communication is considered as a promising solution to enhance the spectral efficiency of the wireless networks by facilitating the physical proximity of nearby active devices [1]. In [31], authors have analyzed the performance of dual-hop cooperative MIMO relay system by employing TAS strategies over Nakagami-m channels and the average symbol error rate (ASER) expression of BPSK scheme is derived. We have derived closed-form upper-bound (UB) ASER expressions for the general order SQAM, RQAM, and HQAM schemes for spectrally efficient D2D MIMO relay system over Nakagami-m fading channels through the cumulative distribution-based approach. An indepth analysis of the ASER of the higher-order modulation schemes such as HQAM, RQAM, XQAM, and SQAM for MIMO systems along with the system performance metrics like outage probability, ergodic capacity and the system geometric location are conducted for the first time in literature and is primarily novelty of this work.
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