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On the Gaussian Fading Broadcast Relay Channel With Causal State Feedback

Abstract : We investigate a typical setup of a heterogeneous network that can be modeled as a fast Rayleigh fading broadcast relay channel with one source (macrocell Base Station), one full-duplex relay (smallcell BS), and two destinations (mobile users). It is assumed that instantaneous channel state information (CSI) is available at the receivers' side, while only a noiseless causal state feedback from the destinations about the source-to-destination channels is available at the relay. We propose a relaying scheme based on a two-stage decode-compress-forward strategy. The essential idea is to let the relay decode the source messages and then forward to the destinations a function of both the decoded messages and the CSI feedback. By characterizing and evaluating the achievable rate region of the proposed relaying scheme, we reveal that non-negligible performance gains over conventional cooperative strategies can be obtained by exploiting CSI feedback at the relay.
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Chao He, Sheng Yang, Pablo Piantanida. On the Gaussian Fading Broadcast Relay Channel With Causal State Feedback. IEEE Transactions on Communications, Institute of Electrical and Electronics Engineers, 2016, 64 (7), pp.2797 - 2807. ⟨10.1109/TCOMM.2016.2562005⟩. ⟨hal-01435507⟩

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