• KSII Transactions on Internet and Information Systems
    Monthly Online Journal (eISSN: 1976-7277)

Soft-Decision for Differential Amplify-and-Forward over Time-Varying Relaying Channel


Abstract

Differential detection schemes do not require any channel estimation, which can be employed under user mobility with low computational complexity. In this work, a soft-input soft-output (SISO) differential detection algorithm is proposed for amplify-and-forward (AF) over time-varying relaying channels based cooperative communications system. Furthermore, maximum-likelihood (ML) detector for M-ary differential Phase-shift keying (DPSK) is derived to calculate a posteriori probabilities (APP) of information bits. In addition, when the SISO is exploited in conjunction with channel decoding, iterative detection and decoding approach by exchanging extrinsic information with outer code is obtained. Finally, simulation results show that the proposed non-coherent approach improves detection performance significantly. In particular, the system can obtain greater performance gain under fast-fading channels.


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Cite this article

[IEEE Style]
Fengyue Gao, Lei Kong and Feihong Dong, "Soft-Decision for Differential Amplify-and-Forward over Time-Varying Relaying Channel," KSII Transactions on Internet and Information Systems, vol. 10, no. 3, pp. 1131-1143, 2016. DOI: 10.3837/tiis.2016.03.010

[ACM Style]
Gao, F., Kong, L., and Dong, F. 2016. Soft-Decision for Differential Amplify-and-Forward over Time-Varying Relaying Channel. KSII Transactions on Internet and Information Systems, 10, 3, (2016), 1131-1143. DOI: 10.3837/tiis.2016.03.010