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

Volume

1

fYear

2000

fDate

2000

Firstpage

103

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE

Conference_Location

San Francisco, CA

Print_ISBN

0-7803-6451-1

Type

conf

DOI

10.1109/GLOCOM.2000.891705

Filename

891705