Distributed Alamouti full-duplex relaying scheme with direct link

Abstract

In full duplex relaying, the direct link and the decode and forward processing delay are not always negligible. The signal transmitted by the source thus interferes, at the destination, with the delayed signal retransmitted by the relay. This paper presents a novel full duplex transmission scheme based on distributed Alamouti encoding (denoted by FDAE) that eliminates the interference problem and combines efficiently each transmitted signal and its delayed copy at the destination for decode and forward relaying. The performances of FDAE are compared to the full duplex system with interference at the destination (denoted by FDI) and to the conventional half duplex relaying. The simulation results show the harmful effect of the interference problem on the end-to-end achievable data rate and on the bit error rate. They also show that our proposed scheme provides a highest end-to-end achievable data rate and lower bit error rate than FDI due to its ability to take advantage of full duplexing while eliminating interference.Index Terms-Full duplex relaying, direct link, processing delay, distributed Alamouti encoding.

Two-way relaying schemes in full duplex cellular system

“…Thus, the channel conditions can be represented by these three factors, i.e., SNR BR , SNR BM , and SNR MR . With (8), (17), (25), (26), (30), and (31), the sum-capacities of the AF relaying scheme and the four DF relaying modes can be seen as functions of SNR BR , SNR BM , and SNR MR .…”

“…The first one is a relay system consisting of one FD RS and two HD source nodes. This kind of system has been extensively studied in the last decade [28][29][30][31]. For example, two hybrid relaying schemes opportunistically switching between FD and HD relaying modes are proposed in [29] to maximize the instantaneous spectral efficiency, and in [31] to minimize the outage probability, respectively.…”

Multi-User Relay Selection for Full-Duplex Radio

“…However, in FD mode, the relayed received signal at the destination is the previous signal of the source. Unless the source employs a smart strategy, e.g., coding such as spacetime code (STC), or destination employs a smart receiving technique, e.g., buffering, this relayed signal interferes with the direct-link received signal at the same time instance [27]- [30]. In [31], the outage probability is derived for a basic three-node FD relay network with direct link over Rayleigh fading channels under distance-dependent path loss.…”

“…Since u n and v are sum of (K − 1) i.i.d. (27) where γ 1n = min (γ 1n,1 , γ 1n,2 ). Then, the exact and asymptotic (p → ∞) outage probabilities can be derived, respectively, as (28) where…”

Cooperative space‐time block coded full‐duplex relaying over frequency‐selective channel

“…However, in order to send a set of STBC symbols completely, three block periods are required so that transmission rate is limited to two‐thirds. In [19], the full‐duplex relay operating in DF mode is equipped with at least three antennas: one is for receiving the signal from the source, the other two are for transmitting the signal to the destination. Using two transmit antennas at the relay, the self‐interference is mitigated by nulling the transmit signal at the relay out based on using the zero‐forcing beamforming technique.…”