Outage Capacity of the Fading Relay Channel in the Low-SNR Regime
- 26 March 2007
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Information Theory
- Vol. 53 (4) , 1401-1415
- https://doi.org/10.1109/tit.2007.892773
Abstract
In slow-fading scenarios, cooperation between nodes can increase the amount of diversity for communication. We study the performance limit in such scenarios by analyzing the outage capacity of slow fading relay channels. Our focus is on the low signal-to-noise ratio (SNR) and low outage probability regime, where the adverse impact of fading is greatest but so are the potential gains from cooperation. We showed that while the standard Amplify-Forward protocol performs very poorly in this regime, a modified version we called the Bursty Amplify-Forward protocol is optimal and achieves the outage capacity of the network. Moreover, this performance can be achieved without a priori channel knowledge at the receivers. In contrast, the Decode-Forward protocol is strictly suboptimal in this regime. Our results directly yield the outage capacity per unit energy of fading relay channelsKeywords
All Related Versions
This publication has 10 references indexed in Scilit:
- Bounds on capacity and minimum energy-per-bit for AWGN relay channelsIEEE Transactions on Information Theory, 2006
- On the Achievable Diversity–Multiplexing Tradeoff in Half-Duplex Cooperative ChannelsIEEE Transactions on Information Theory, 2005
- Outage-optimal relaying in the low SNR regimePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Cooperative Diversity in Wireless Networks: Efficient Protocols and Outage BehaviorIEEE Transactions on Information Theory, 2004
- User cooperation diversity-part I: system descriptionIEEE Transactions on Communications, 2003
- Diversity and multiplexing: a fundamental tradeoff in multiple-antenna channelsIEEE Transactions on Information Theory, 2003
- Elements of Information TheoryPublished by Wiley ,2001
- On channel capacity per unit costIEEE Transactions on Information Theory, 1990
- Capacity theorems for the relay channelIEEE Transactions on Information Theory, 1979
- The Distribution of a Quadratic Form of Normal Random VariablesThe Annals of Mathematical Statistics, 1967