Title :
An efficient multiuser loading algorithm for OFDM-based broadband wireless systems
Author :
Yin, Hujun ; Liu, Hui
Author_Institution :
Dept. of Electr. Eng., Washington Univ., Seattle, WA, USA
Abstract :
In this paper we present a novel loading algorithm for OFDM-based multiuser communication system to maximize the total system throughput while satisfying the total power and users´ rate constraints. The new scheme determines the subcarrier, bit, and power allocation by decoupling an NP-hard combinatorial problem into two steps: (1) resource allocation (how much power and how many subcarriers for each user) based on users´ average channel gains and their rate requirements; and (2) subcarrier assignment and bit loading based on users´ channel profiles across all subcarriers. Compared to existing iterative methods, the two-step approach offers comparable capacity gain with much lower complexity
Keywords :
OFDM modulation; broadband networks; computational complexity; multimedia communication; multiuser channels; optimisation; resource allocation; NP-hard combinatorial problem; OFDM-based broadband wireless systems; average channel gains; bit loading; capacity gain; channel profiles; complexity; efficient multiuser loading algorithm; multimedia traffic; multiuser communication system; power allocation; resource allocation; subcarrier assignment; total power; total system throughput; users´ rate constraints; Bit rate; Downlink; Iterative methods; Noise level; OFDM modulation; Radio spectrum management; Resource management; Signal to noise ratio; Throughput; Time division multiple access;
Conference_Titel :
Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-6451-1
DOI :
10.1109/GLOCOM.2000.891705
