Double-Differential Encoding for Dual-Hop Amplify-and-Forward Relaying in IR-UWB Systems

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In this paper, the authors propose to improve the performance of impulse-radio ultra-wideband (IR-UWB) systems by means of cooperative relaying. With regard to a simple practical realization, they focus on a non-coherent system setup in conjunction with amplify-and-forward (A&F) relaying. In particular, considering a two-hop scenario they propose to employ a double-differential encoding scheme at the source node and single differential decoding at the relay and the destination node, respectively, so as to efficiently limit InterSymbol-Interference (ISI) effects. A thorough performance analysis of the proposed scheme is provided, along with a closed-form optimization of the transmit power allocation between source and relay.