Research Article
Channel and Multiuser Diversities in Wireless Systems: Delay-Energy Tradeoff
@INPROCEEDINGS{10.1109/WIOPT.2007.4480088, author={Prasanna Chaporkar and Kimmo Kansanen and Ralf R. Muller}, title={Channel and Multiuser Diversities in Wireless Systems: Delay-Energy Tradeoff}, proceedings={3rd International ICST Workshop on Resource Allocation in Wireless Networks}, publisher={IEEE}, proceedings_a={RAWNET}, year={2008}, month={3}, keywords={Super-position coding delay guarantees multi-access channel opportunistic scheduling rate guarantees stability}, doi={10.1109/WIOPT.2007.4480088} }- Prasanna Chaporkar
Kimmo Kansanen
Ralf R. Muller
Year: 2008
Channel and Multiuser Diversities in Wireless Systems: Delay-Energy Tradeoff
RAWNET
IEEE
DOI: 10.1109/WIOPT.2007.4480088
Abstract
We consider a communication system with multi-access fading channel. Each user in the system requires certain rate guarantee. Our main contribution is to devise a scheduling scheme called "Opportunistic Super-position Coding"that satisfies the users' rate requirements. Using mean-field analysis, i.e., when the number of users go to infinity, we analytically show that the energy required to guarantee the required user rate can be made as small as required at the cost of a higher delay ("delay- energy tradeoff"). We explicitly compute the delay under the proposed scheduling policy and discuss how delay differentiation can be achieved. We extend the results to multi-band multi-access channel. Finally, all the results can be generalized in a straightforward fashion to broadcast channel because of the uplink-downlink duality.
