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Performance Analysis of a Cooperative System with Rateless Codes and Buffered Relays

Mehta, NB and Bansal, V and Sharma, G (2011) Performance Analysis of a Cooperative System with Rateless Codes and Buffered Relays. In: IEEE Transactions on Wireless Communications, 10 (4). pp. 1069-1081.

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Abstract

In a cooperative relay-assisted communication system that uses rateless codes, packets get transmitted from a source to a destination at a rate that depends on instantaneous channel states of the wireless links between nodes. When multiple relays are present, the relay with the highest channel gain to the source is the first to successfully decode a packet from the source and forward it to the destination. Thus, the unique properties of rateless codes ensure that both rate adaptation and relay selection occur without the transmitting source or relays acquiring instantaneous channel knowledge. In this paper, we show that in such cooperative systems, buffering packets at relays significantly increases throughput. We develop a novel analysis of these systems that combines the communication-theoretic aspects of cooperation over fading channels with the queuing-theoretic aspects associated with buffering. Closed-form expressions are derived for the throughput and end-to-end delay for the general case in which the channels between various nodes are not statistically identical. Corresponding results are also derived for benchmark systems that either do not exploit spatial diversity or do not buffer packets. Altogether, our results show that buffering - a capability that will be commonly available in practical deployments of relays - amplifies the benefits of cooperation.

Item Type: Journal Article
Additional Information: Copyright 2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Cooperative communications;relay selection;queuing;rateless codes;fading channels;round robin;delay;throughput.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 23 Feb 2012 09:49
Last Modified: 23 Feb 2012 09:49
URI: http://eprints.iisc.ernet.in/id/eprint/43119

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