A Buffer-Aided Successive Opportunistic Relay Selection Scheme With Power Adaptation and Inter-Relay Interference Cancellation for Cooperative Diversity Systems

Νομικός, Νικόλαος; Charalambous, Themistoklis; Krikidis, Ioannis; Skoutas, Dimitrios N.; Vouyioukas, Demosthenes; Johansson, Mikael

doi:10.1109/tcomm.2015.2416234

Cited by 54 publications

(41 citation statements)

References 41 publications

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“…In each time slot, the source and a relay simultaneously transmit their own data to mimic FD relaying (cf. [22,26,27,23,24]). The transmission powers of the source and the k-th relay are denoted by P S and P T , respectively.…”

Section: System Modelmentioning

confidence: 99%

“…More practical topologies were studied in [23,24,25] where IRI exists and is not always possible to be cancelled. For fixed rate transmission, the proposed min − power solution proposed in [24], combining power adaptation and interference cancellation, provides a performance close to the upper bound of SFD-MMRS. In addition, Kim and Bengtsson [26,27] proposed buffer-aided relay selection and beamforming schemes taking the IRI into consideration; they consider a model which can be regarded as an example of relay-assisted device-to-device (D2D) communications, where the source and destination are low-cost devices with a single antenna and the relays comprise more powerful relays with buffers and multiple antennas.…”

Section: Introductionmentioning

confidence: 99%

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Relay-pair selection in buffer-aided successive opportunistic relaying using a multi-antenna source

et al. 2019

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We study a cooperative network with a buffer-aided multi-antenna source, multiple half-duplex (HD) buffer-aided relays and a single destination. Such a setup could represent a cellular downlink scenario, in which the source can be a more powerful wireless device with a buffer and multiple antennas, while a set of intermediate less powerful devices are used as relays to reach the destination. The main target is to recover the multiplexing loss of the network by having the source and a relay to simultaneously transmit their information to another relay and the destination, respectively. Successive transmissions in such a cooperative network, however, cause inter-relay interference (IRI). First, by assuming global channel state information (CSI), we show that the detrimental effect of IRI can be alleviated by precoding at the source, mitigating or even fully cancelling the interference. A cooperative relaying policy is proposed that employs a joint precoding design and relay-pair selection. Note that both fixed rate and adaptive rate transmissions can be considered. For the case when channel state information is only available at the receiver side (CSIR), we propose a relay selection policy that employs a phase alignment technique to reduce the IRI. The performance of the two proposed relay pair selection policies are evaluated and compared with other state-of-the-art relaying schemes in terms of outage and throughput. The results show that the use of a powerful source can provide considerable performance improvements.

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Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relay-pair selection in buffer-aided successive opportunistic relaying using a multi-antenna source

et al. 2019

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“…In this subsection, we describe the best relay selection algorithm used in conjunction with the DSTC scheme in the SAS configuration. In particular, the best relay selection algorithm is based on the techniques reported in [9] and [26], however, the approach presented here is modified for DSTC schemes and buffer-aided relay systems. In the first hop, the M × 1 modulated signal vector s[j] is broadcast to the relays during M time slots and the M × 1 received symbol vector r SR k [j] is given by…”

Section: B Best Relay Selection With Dstc In Sasmentioning

confidence: 99%

Adaptive Buffer-Aided Distributed Space-Time Coding for Cooperative Wireless Networks

Peng

Lamare

2016

IEEE Trans. Commun.

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his work proposes adaptive buffer-aided distributed space-time coding schemes and algorithms with feedback for wireless networks equipped with buffer-aided relays. The proposed schemes employ a maximum likelihood receiver at the destination and adjustable codes subject to a power constraint with an amplify-and-forward cooperative strategy at the relays. Each relay is equipped with a buffer and is capable of storing blocks of received symbols and forwarding the data to the destination if selected. Different antenna configurations and wireless channels, such as static block fading channels, are considered. The effects of using buffer-aided relays to improve the bit error rate (BER) performance are also studied. Adjustable relay selection and optimization algorithms that exploit the extra degrees of freedom of relays equipped with buffers are developed to improve the BER performance. We also analyze the pairwise error probability and diversity of the system when using the proposed schemes and algorithms in a cooperative network. Simulation results show that the proposed schemes and algorithms obtain performance gains over previously reported techniques.his work proposes adaptive buffer-aided distributed space-time coding schemes and algorithms with feedback for wireless networks equipped with buffer-aided relays. The proposed schemes employ a maximum likelihood receiver at the destination and adjustable codes subject to a power constraint with an amplify-and-forward cooperative strategy at the relays. Each relay is equipped with a buffer and is capable of storing blocks of received symbols and forwarding the data to the destination if selected. Different antenna configurations and wireless channels, such as static block fading channels, are considered. The effects of using buffer-aided relays to improve the bit error rate (BER) performance are also studied. Adjustable relay selection and optimization algorithms that exploit the extra degrees of freedom of relays equipped with buffers are developed to improve the BER performance. We also analyze the pairwise error probability and diversity of the system when using the proposed schemes and algorithms in a cooperative network. Simulation results show that the proposed schemes and algorithms obtain performance gains over previously reported techniques.T

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“…In the future IoT networks, traffic delay requirements are diversified from the upper layers imposing challenges to physical layer design in resource allocation. Thus far, many studies have been carried out on cross-layer design to improve the energy efficiency of the whole system [1], [22]- [24], which is expected to be more appealing and practical for the next generation of wireless networks.…”

Section: Introductionmentioning

confidence: 99%

Energy-Efficient Buffer-Aided Relaying Systems With Opportunistic Spectrum Access

Wang

Chen

et al. 2020

IEEE Trans. on Green Commun. Netw.

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In this paper, an energy-efficient cross-layer design framework is proposed for cooperative relaying networks, which takes into account the influence of spectrum utilization probability. Specifically, random arrival traffic is considered and an adaptive modulation and coding (AMC) scheme is adopted in the cooperative transmission system to improve the system performance. The average packet dropping rate of the relaybuffer is studied at first. With the packet dropping rate and stationary distribution of the system state, the closed-form expression of the delay is derived. Then the energy efficiency for relayassisted transmission is investigated, which takes into account the queueing process of the relay and the source. In this context, an energy efficiency optimization problem is formulated to determine the optimum strategy of power and time allocation for the relay-assisted cooperative system. Finally, the energy efficient switching strategy between the relay assisted transmission and the direct transmission is obtained, where packet transmissions have different delay requirements. In addition, energy efficient transmission policy with AMC is obtained. Numerical results demonstrate the effectiveness of the proposed design improving the energy efficiency.Index Terms-Energy efficiency and delay tradeoff, cross-layer design, opportunistic spectrum access, mode switching.

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A Buffer-Aided Successive Opportunistic Relay Selection Scheme With Power Adaptation and Inter-Relay Interference Cancellation for Cooperative Diversity Systems

Cited by 54 publications

References 41 publications

Relay-pair selection in buffer-aided successive opportunistic relaying using a multi-antenna source

Relay-pair selection in buffer-aided successive opportunistic relaying using a multi-antenna source

Adaptive Buffer-Aided Distributed Space-Time Coding for Cooperative Wireless Networks

Energy-Efficient Buffer-Aided Relaying Systems With Opportunistic Spectrum Access

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