Relay Selection for Modulation-Adaptive Opportunistic DF Relaying Using Mixed Channel Knowledge

Provided by: Institute of Electrical & Electronic Engineers
Topic: Mobility
Format: PDF
Recently developed adaptive modulation schemes for opportunistic Decode-and-Forward (DF) relaying require knowledge of instantaneous Channel-State-Information (CSI) of all links. This paper aims at reducing signalling overhead of modulation-adaptive opportunistic DF relaying through exploitation of mixed channel knowledge. A novel semi-deterministic approach is proposed for performing joint rate-adaptation and best-relay selection. The selection process employs two criteria using mixed channel knowledge. A new metric namely the Probability of Missing the Best Relay (PMBR) is introduced, as only when the best relay is selected, the full diversity order can be achieved.

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