Successive relaying is a bandwidth-efficient scheme in cooperative networks. In this study, a noveldistributedspace-timecoding (DSTC) transmissionscheme for a two-path successive relay network is proposed that enj...
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Successive relaying is a bandwidth-efficient scheme in cooperative networks. In this study, a noveldistributedspace-timecoding (DSTC) transmissionscheme for a two-path successive relay network is proposed that enjoys threshold-based selection relaying protocol. A new beamforming method is also employed alongside the proposed DSTC transmissionscheme. Three scenarios are considered in this study. In the first scenario, single-input-single-output (SISO) relays are considered. In the second and third scenarios, multiple-input-multiple-output (MIMO) relays are used, but in the second case a transmissionscheme named as quasi-DSTC scheme alongside employing space-timecoding at each relay is proposed. A closed-form expression for the end-to-end bit error rate (BER) of the system is derived and it is shown that regardless of the fading in inter-relay channel, the proposed scheme achieves full diversity order even when there are decoding errors at the relay nodes. Simulation results show a significant saving in power of about 2.5, 3, and 4dB at BER compared with other conventional methods in the case of using SISO relays, MIMO relays in the second and third scenarios, respectively.
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