Research Article
Rate and Power Allocation in Fading Multiple Access Channels
@INPROCEEDINGS{10.4108/ICST.WIOPT2008.3215, author={Ali Parandehgheibi and Atilla Eryilmaz and Asuman Ozdaglar and Muriel Medard}, title={Rate and Power Allocation in Fading Multiple Access Channels}, proceedings={6th International ICST Symposium on Modeling and Optimization}, publisher={IEEE}, proceedings_a={WIOPT}, year={2008}, month={8}, keywords={Fading Laboratories Multiaccess communication Power control Quality of service Resource management Statistics Throughput Transmitters Upper bound}, doi={10.4108/ICST.WIOPT2008.3215} }- Ali Parandehgheibi
Atilla Eryilmaz
Asuman Ozdaglar
Muriel Medard
Year: 2008
Rate and Power Allocation in Fading Multiple Access Channels
WIOPT
IEEE
DOI: 10.4108/ICST.WIOPT2008.3215
Abstract
We consider the problem of rate and power allocation in a fading multiple-access channel. Our objective is to obtain rate and power allocation policies that maximize a utility function defined over average transmission rates. In contrast with the literature, which focuses on the linear case, we present results for general concave utility functions. We consider two cases. In the first case, we assume that power control is possible and channel statistics are known. In this case, we show that the optimal policies can be obtained greedily by maximizing a linear utility function at each channel state. In the second case, we assume that power control is not possible and channel statistics are not available. In this case, we define a greedy rate allocation policy and provide upper bounds on the performance difference between the optimal and the greedy policy. Our bounds highlight the dependence of the performance difference on the channel variations and the structure of the utility function.
