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- Title
New beamforming and space-time coding for two-path successive decode and forward relaying.
- Authors
Gilan, Mahsa Shirzadian; Olfat, Ali
- Abstract
Successive relaying is a bandwidth-efficient scheme in cooperative networks. In this study, a novel distributed space-time coding (DSTC) transmission scheme 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 transmission scheme. 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 transmission scheme named as quasi-DSTC scheme alongside employing space-time coding 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 4 dB at BER (10-4) compared with other conventional methods in the case of using SISO relays, MIMO relays in the second and third scenarios, respectively.
- Subjects
BEAMFORMING; SPACE-time codes; RELAY control systems; MIMO systems; BIT error rate
- Publication
IET Communications (Wiley-Blackwell), 2018, Vol 12, Issue 13, p1573
- ISSN
1751-8628
- Publication type
Article
- DOI
10.1049/iet-com.2017.1272