Li, James C. F. and Dey, Subhrakanti (2010) Outage minimisation in wireless relay networks with delay constraints and causal channel feedback. European Transactions on Telecommunications, 21. pp. 251-265. ISSN 1124-318X

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Abstract

Motivated by delay‐sensitive information transmission applications, we solve an optimal power allocation problem with a K‐block delay constraint on data transmission using a cooperative relay network assuming a block fading channel model. Channel information is fed back to the transmitter only in a causal fashion, so that the optimal power allocation strategy is only based on the current and past channel gains. We consider the two simplest schemes for information transmission using a three node (a source, a relay and a destination) relay network, namely the amplify and forward (AF) and decode and forward (DF) protocols. We use a dynamic programming (DP) based methodology to solve a (K‐block delay constrained) general expected cost optimisation problem with a short term (over K blocks) sum power (total transmission power of the source and the relay) constraint. By specialising the cost function appropriately, we solve the delay constrained outage minimisation problem in this paper. We also propose a simple but sub‐optimal power allocation scheme based on a high signal to noise ratio (SNR) approximation, which is computationally much less demanding than the DP‐based optimal method. Extensive numerical results are presented for Rayleigh and Rician fading channels, including results demonstrating the performance gain obtained by optimally allocating the (sum of source and relay) power to the different blocks as opposed to equally distributing the total power across all blocks. The accuracy of the high SNR approximation based power allocation scheme is also illustrated.

Item Type:	Article
Additional Information:	Cite as: Li, J.C.F. and Dey, S. (2010), Outage minimisation in wireless relay networks with delay constraints and causal channel feedback. Eur. Trans. Telecomm., 21: 251-265. https://doi.org/10.1002/ett.1376
Keywords:	Cognitive radio; spectrum sharing; fading channels; ergodic capacity; finite-rate feedback;
Academic Unit:	Faculty of Science and Engineering > Electronic Engineering Faculty of Science and Engineering > Research Institutes > Hamilton Institute
Item ID:	14383
Identification Number:	https://doi.org/10.1002/ett.1376
Depositing User:	Subhrakanti Dey
Date Deposited:	26 Apr 2021 15:42
Journal or Publication Title:	European Transactions on Telecommunications
Publisher:	Wiley
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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