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Capacity Scaling Law in Opportunistic Amplify-and-Forward Relaying with Selective ID Feedback

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3 Author(s)
Jung-Bin Kim ; Ajou University, Suwon, 443-749, Korea. J. B. Kim is visiting Stanford University, Stanford, CA 94305 USA, as a Postdoctoral Visiting Scholar for the current year ; Jaesung Lim ; John M. Cioffi

This letter investigates the achievable capacity scaling of power-constrained amplify-and-forward (AF) opportunistic relaying (OR) for a large number of relays K with limited feedback. In order to reduce the feedback overhead, this letter adopts a selective ID feedback through contention-based feedback channels. Considering the feedback congestion error, this letter shows that the selective ID feedback closely achieves the capacity growth rate 1/2 log log K, and simultaneously reduces the feedback overhead by a large amount. An appropriate choice for the threshold, which can be calculated distributively at each relay, is also given.

Published in:

IEEE Communications Letters  (Volume:16 ,  Issue: 5 )