Diversity-Multiplexing Trade-off for Coordinated Direct and Relay Schemes

Thai, Chan Dai Truyen; Popovski, Petar; Carvalho, Edmir Daniel; Sun, Fenggang

doi:10.1109/twc.2013.062713.120711

Cited by 9 publications

(2 citation statements)

References 19 publications

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“…The idea of exploiting overheard messages in the design of communication systems has been widely adopted for various types of network, such as network coding systems [14][15][16][17], cognitive radio systems [18] and cellular networks [19].…”

Section: Introductionmentioning

confidence: 99%

Energy‐efficient transmission for decode‐and‐forward dual‐hop networks with asymmetric traffic demands

et al. 2015

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Two-way relaying systems efficiently accomplish transmissions in both directions within dual-hop, hence, two time slots can be saved compared with one-way relaying. However, the conventional two-way relaying protocol requires the assumption of symmetric traffic demands, that is, each transmitter node has to act as a receiver in latter slot. This assumption restricts applying two-way relay to general and practical scenarios. In this study, the authors release this unpractical constraint by assuming that the transmitter in slot 1 and receiver in slot 2 can be any nodes, which are not necessarily being the same. For this scenario, a novel transmission protocol exploiting the overhearing link to suppress the interference caused by asymmetric traffic, denoted as overhearing transmission, is proposed. With the overhearing transmission protocol, and in the light of green communications, the precoding matrices at the decode-and-forward multi-antenna relay are optimised to improve energy efficiency in both uplink and downlink (DL) transmission directions, where the objective is to minimise the transmit power at the relay while guaranteeing a target transmission rate. The authors transform the original non-convex problem to an equivalent form, which can be readily solved by typical semi-definite relaxation approaches. An efficient algorithm is further proposed to implement the precoding design in practice. Simulation results show that the proposed algorithm is able to minimise the power consumption at the relay, with the minimum rate constraints of both the uplink and DL transmissions being satisfied.

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Section: Introductionmentioning

confidence: 99%

Energy‐efficient transmission for decode‐and‐forward dual‐hop networks with asymmetric traffic demands

et al. 2015

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“…And some other criteria such as maximizing sum rate, minimizing outage probability and maximizing mutual information were proposed in [6]- [8]. Authors in [9] studied the diversity-multiplexing tradeoff for two-way relaying networks with all and partial CSI knowledge.…”

Section: Introductionmentioning

confidence: 99%

Opportunistic Multiple Relay Selection for Two-Way Relay Networks with Outdated Channel State Information

2014

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Outdated Channel State Information (CSI) was proved to have negative effect on performance in two-way relay networks. The diversity order of widely used opportunistic relay selection (ORS) was degraded to unity in networks with outdated CSI. This paper proposed a multiple relay selection scheme for amplify-and-forward (AF) based two-way relay networks (TWRN) with outdated CSI. In this scheme, two sources exchange information through more than one relays. We firstly select N best relays out of all candidate relays with respect to signal-noise ratio (SNR). Then, the ratios of the SNRs on the rest of the candidate relays to that of the Nth highest SNR are tested against a normalized threshold μ∈[0, 1], and only those relays passing this test are selected in addition to the N best relays. Expressions of outage probability, average bit error rate (BER) and ergodic channel capacity were obtained in closed-form for the proposed scheme. Numerical results and Simulations verified our theoretical analyses, and showed that the proposed scheme had significant gains comparing with conventional ORS.

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