Abstract
Multiple input multiple output (MIMO) based orthogonal frequency division multiplexing (OFDM) has widely been used in a wireless communications system for its robustness to frequency-selective channels and better spectral efficiency. The introduction of full-duplex (FD) and device-to-device (D2D) communications, which are potential candidates of fifth-generation (5G) and beyond, further improve the spectral efficiency of MIMO-OFDM based systems. This paper proposes a novel MIMO-OFDM based FD Cooperative-D2D (C-D2D) communications system wherein a cellular user (CU) acts as an FD relay to facilitate seamless communications between D2D transmitter and receiver. The complete analytical framework is presented to analyze the end-to-end performance of the proposed system. Specifically, the closed-form expression for symbol error rate (SER) of the proposed system is derived in the presence of multipath Rayleigh fading channel and residual self-interference (RSI) due to the FD mode. Further, the performance of the system is analyzed in the presence of a nonlinear high power amplifier (HPA) which introduces the nonlinear distortion. Finally, simulation results are presented to verify the derived expressions. The results show that there is higher SER in the presence of nonlinear HPA due to nonlinear distortion, which can be reduced by increasing input back off (IBO). The presence of RSI also increases the SER at CU, which is further reduced by employing self-interference cancellation (SIC) techniques. A complete end-to-end analytical framework is designed to compare the performance of the proposed system with the conventional system with linear HPA and no RSI.
Highlights
W ITH the rapid proliferation of the internet of everything (IoE) systems [1], [2] connecting billions of machines and millions of mobile devices, the need for ultrahigh data rates have increased by leaps and bounds
CONTRIBUTIONS Motivated by the existing literature, in this paper, we have proposed a Multiple input multiple output (MIMO)-orthogonal frequency division multiplexing (OFDM) based FD C-D2D communications system, where a cellular user (CU) assists D2D transmission
This paper proposed a MIMO-OFDM based FD C-D2D system, where a CU acts as an FD relay (FDR) for D2D transmission
Summary
W ITH the rapid proliferation of the internet of everything (IoE) systems [1], [2] connecting billions of machines and millions of mobile devices, the need for ultrahigh data rates have increased by leaps and bounds. The work in [23], [24] is limited to single carrier transmissions with a maximum of two antennas at CU, and the performance gain due to MIMO-OFDM has not been explored. In [28], authors have proposed a D2D MIMO communications system, wherein a D2D user acts as an amplify-and-forward (AF) relay for the cellular downlink transmission. B. CONTRIBUTIONS Motivated by the existing literature, in this paper, we have proposed a MIMO-OFDM based FD C-D2D communications system, where a CU assists D2D transmission. A complete end-to-end analytical methodology is proposed to obtain the received SDNR and symbol error rate (SER) of the proposed MIMO-OFDM based FD CD2D communications system. Scalars have been denoted by lower case non-bold italic letters
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