Multiple-differential encoding for multi-hop amplify-and-forward IR-UWB systems
Hamdi M, Mietzner J, Schober R (2011)
Publication Type: Journal article
Publication year: 2011
Journal
Book Volume: 10
Pages Range: 2577-2591
Article Number: 5910115
Journal Issue: 8
DOI: 10.1109/TWC.2011.060811.100582
Abstract
In this paper, we propose a novel multi-hop relaying scheme to improve the performance and coverage of impulse-radio-based ultra-wideband (IR-UWB) systems. With regard to a simple practical realization, we focus on a non-coherent system setup in conjunction with amplify-and-forward (A&F) relaying. In particular, we propose to employ a multiple-differential encoding scheme at the source node and single differential decoding at each relay and at the destination node, respectively, so as to efficiently limit intersymbol- interference effects at the destination node. For a dual-hop system we derive a closedform expression for the signal-to-noise ratio (SNR) at the destination node, and for the general multi-hop case we provide a simple recursive formula for SNR calculation. Based on these SNR results, we obtain a closed-form expression for the optimal transmit power allocation to the source node and the relay for a dual-hop system and a simple recursive suboptimal power allocation scheme for the multi-hop case, which permits a semi-distributed implementation with limited feedback between nodes. Simulation results illustrate the excellent performance of the proposed multiple-differential encoding scheme with A&F relaying for both uncoded and coded transmission compared to various alternative coherent and non-coherent schemes based on A&F relaying and decode-and-forward (D&F) relaying. Furthermore, our simulations confirm the (near-)optimal performance of the proposed power allocation solutions. © 2006 IEEE.
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APA:
Hamdi, M., Mietzner, J., & Schober, R. (2011). Multiple-differential encoding for multi-hop amplify-and-forward IR-UWB systems. IEEE Transactions on Wireless Communications, 10(8), 2577-2591. https://doi.org/10.1109/TWC.2011.060811.100582
MLA:
Hamdi, Maziyar, Jan Mietzner, and Robert Schober. "Multiple-differential encoding for multi-hop amplify-and-forward IR-UWB systems." IEEE Transactions on Wireless Communications 10.8 (2011): 2577-2591.
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