Title :
Joint power and bandwidth allocation for discrete-rate multi-user link adaptation with imperfect channel state information
Author :
Rasool, Jawad ; Øien, Geir E.
Author_Institution :
Dept. of Electron. & Telecommun., Norwegian Univ. of Sci. & Technol. (NTNU), Trondheim, Norway
Abstract :
In practical wireless networks, the available transmission power and bandwidth are limited resources. Therefore, joint bandwidth and power allocation for wireless multi-user networks is essential in order to improve the network performance. Most of the research has focused on continuous rate, power, and bandwidth allocations in the presence of perfect channel knowledge. However, this is not the case with practical systems. In this paper, we therefore consider the issue of discrete power and bandwidth allocation for discrete-rate multi-user link adaptation with imperfect channel state information. To be more specific, we discuss how the system can be designed in such a scenario for i) sum rate maximization and ii) average power minimization in a multi-user setting. The results show that with only a few codes, we can approach the performance of systems that employ continuous (infinite) rates. We have also found that imperfect channel information at the base station affects the performance such that the sum rate is decreased and the average power consumption is increased.
Keywords :
bandwidth allocation; multiuser channels; optimisation; radio networks; average power minimization; bandwidth allocation; discrete power allocation; discrete-rate multiuser link adaptation; imperfect channel state information; joint power allocation; perfect channel knowledge; power consumption; sum rate maximization; wireless multiuser networks; Bandwidth; Base stations; Channel allocation; Fading; Joints; Resource management; Signal to noise ratio;
Conference_Titel :
Personal Indoor and Mobile Radio Communications (PIMRC), 2012 IEEE 23rd International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
978-1-4673-2566-0
Electronic_ISBN :
2166-9570
DOI :
10.1109/PIMRC.2012.6362692