Asimplediamondhalf-duplexrelaynetworkcomposedofasource, two decode-and-forward half-duplexrelays, and a destination is considered, where a direct link between the source and the destination does not exist. For this network, we study the case of buffer-aided relays, where the relays are equipped with buffers. Each relay can receive data from the source, store it in the buffer, and forward it to the destination when the channel conditions are advantageous. Thereby, buffering enables adaptive scheduling of the transmissions and receptions over time, which allows the network to exploit the diversityofferedbythefadingchannels.For the considered half-duplex network, four transmission modes are defined based on whether the relay nodes receive or transmit. In this paper, we derive the optimal scheduling of the transmission modes over time and investigate the achievable average rate when the relays are affected by inter-relay interference. Since the proposed buffer-aided transmission policies introduce un bounded delay, we provide a sub-optimal buffer-aided transmission policy with limited delay. Moreover, for inter-relay interference cancellation, we consider two coding schemes with different complexities. In the first scheme, we employ Dirty Paper Coding (DPC), which entails a high complexity whereas in the second scheme, we adopt a low-complexity interference cancellation technique. Based on numerical results, we show that the proposed protocols, with and without delay constraints, outperform existing protocols for the considered network from the literature.

Buffer-Aided Diamond Relay Network with Block Fading and Inter-Relay Interference / Simoni, Renato; Jamali, Vahid; Zlatanov, Nikola; Schober, Robert; Pierucci, Laura; Fantacci, Romano. - In: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS. - ISSN 1536-1276. - STAMPA. - 15:(2016), pp. 7357-7372. [10.1109/TWC.2016.2601333]

Buffer-Aided Diamond Relay Network with Block Fading and Inter-Relay Interference

SIMONI, RENATO;PIERUCCI, LAURA;FANTACCI, ROMANO
2016

Abstract

Asimplediamondhalf-duplexrelaynetworkcomposedofasource, two decode-and-forward half-duplexrelays, and a destination is considered, where a direct link between the source and the destination does not exist. For this network, we study the case of buffer-aided relays, where the relays are equipped with buffers. Each relay can receive data from the source, store it in the buffer, and forward it to the destination when the channel conditions are advantageous. Thereby, buffering enables adaptive scheduling of the transmissions and receptions over time, which allows the network to exploit the diversityofferedbythefadingchannels.For the considered half-duplex network, four transmission modes are defined based on whether the relay nodes receive or transmit. In this paper, we derive the optimal scheduling of the transmission modes over time and investigate the achievable average rate when the relays are affected by inter-relay interference. Since the proposed buffer-aided transmission policies introduce un bounded delay, we provide a sub-optimal buffer-aided transmission policy with limited delay. Moreover, for inter-relay interference cancellation, we consider two coding schemes with different complexities. In the first scheme, we employ Dirty Paper Coding (DPC), which entails a high complexity whereas in the second scheme, we adopt a low-complexity interference cancellation technique. Based on numerical results, we show that the proposed protocols, with and without delay constraints, outperform existing protocols for the considered network from the literature.
2016
15
7357
7372
Simoni, Renato; Jamali, Vahid; Zlatanov, Nikola; Schober, Robert; Pierucci, Laura; Fantacci, Romano
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1048792
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