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- W2897067551 abstract "Abstract In this paper, a decode‐and‐forward (DF) cooperative network under Nakagami‐m fading is considered. A threshold‐based selection relaying scheme is used to choose the relays for cooperation and the selected relays then employ distributed space‐time coding (DSTC) to retransmit their detected symbols to destination. When employing DSTC, due to decoding errors at DF relays, intersymbol interference (ISI) would be inevitable in these networks. A new beamforming (BF) method, named as bisector alignment, is proposed for mitigating ISI between symbols of DSTC scheme caused by erroneous detection of symbols at relay. It is demonstrated that this scheme by using a simple maximal ratio combining is more power efficient compared with other existing methods. A closed‐form expression for end‐to‐end bit error rate (BER) of the system is derived and the asymptotic behavior analysis of the system illustrates that the threshold‐based selection relaying scheme by employing proper thresholds derived in this paper achieves full diversity order ( M + 1) m in a network with M relays and Nakagami shape parameter m . Moreover, we can observe an excellent agreement between analytical and simulation results and the proposed BF achieves more than 3‐dB power gain at BER of 10 −3 . Based on our results, it can be seen that our proposed scheme is robust to imperfect channel estimation and quantizations." @default.
- W2897067551 created "2018-10-26" @default.
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- W2897067551 date "2018-10-22" @default.
- W2897067551 modified "2023-09-25" @default.
- W2897067551 title "New beamforming and distributed space‐time coding with selection relaying over Nakagami‐m fading channels" @default.
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- W2897067551 doi "https://doi.org/10.1002/ett.3528" @default.
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