Title :
Proportional resource allocation for multi-user OFDM systems
Author :
Zhao, Xinfeng ; Zheng, Laibo ; Huang, Mingjuan ; Wang, Jintang
Author_Institution :
Sch. of Inf. Sci. & Eng., Shandong Univ., Jinan, China
Abstract :
A novel resource allocation algorithm for multiuser OFDM systems with proportional fairness is presented in this paper. The algorithm aims to maximum the total transmit rate subject to the overall transmit power constraint and proportional user rate constraint with knowledge of the channel information. The proposed algorithm divides the problem into two steps: bit loading and subcarrier allocation. Bit loading algorithm is easily implemented according to Shannon Theorem with uniformly allocated power on each subcarrier of every user. Then in each iteration of subcarrier allocation, user with least normalized transmit rate has the priority to choose the best subcarrier. The computational complexity of the proposed algorithm is analyzed, as well as the fairness performance which is evaluated by a new proportional fairness index. Compared with two typical suboptimal algorithms, the proposed algorithm can achieve a better balance in proportional fairness, complexity and total transmit rate.
Keywords :
OFDM modulation; channel capacity; multiuser channels; resource allocation; bit loading; channel information; multi-user OFDM systems; proportional resource allocation; subcarrier allocation; Adaptation model; Channel capacity; Complexity theory; Loading; OFDM; Resource management; Signal to noise ratio; bit loading; multi-user orthogonal frequency division multiplexing (Multi-user OFDM) systems; proportional fairness(PF); resource allocation; subcarrier allocation;
Conference_Titel :
Information Theory and Information Security (ICITIS), 2010 IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-6942-0
DOI :
10.1109/ICITIS.2010.5689743