A distributed algorithm for dynamic sub-channel assignment in a multiuser OFDM communication system

Author

Seyedi, Alireza ; Saulnier, Gary J.

Author_Institution

Dept. of Electr. Comput. & Syst. Eng., Rensselaer Polytech. Inst., Troy, NY, USA

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

397

Lastpage

400

Abstract

We propose and study a sub-channel selective OFDM spread spectrum system and a distributed algorithm for sub-channel allocation. The proposed system is a combination of OFDMA and OFDM-CDMA systems. For each user the maximal ratio combining weights of the sub-channels are used as channel information. The algorithm implements a simple but sub-optimal version of the water filling power allocation, thus increasing the transmitter power efficiency and decreasing the interference generated for other users. This algorithm also provides the ability to offer different quality of service (QoS) levels for different users. The convergence of the algorithm and its performance have been studied through simulation. The proposed system has significant advantage in BER performance, over the conventional OFDM-SS system

Keywords

OFDM modulation; channel allocation; code division multiple access; distributed algorithms; error statistics; frequency division multiple access; multiuser channels; quality of service; radiofrequency interference; spread spectrum communication; BER performance; OFDM-CDMA; OFDM-SS system; OFDMA; QoS levels; algorithm convergence; channel information; distributed algorithm; dynamic sub-channel assignment; interference; maximal ratio combining weights; multiuser OFDM communication system; quality of service; simulation; sub-channel allocation; sub-channel selective OFDM spread spectrum system; transmitter power efficiency; water filling power allocation; Convergence; Distributed algorithms; Diversity reception; Filling; Interference; OFDM; Power generation; Quality of service; Spread spectrum communication; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Statistical Signal Processing, 2001. Proceedings of the 11th IEEE Signal Processing Workshop on

Print_ISBN

0-7803-7011-2

Type

conf

DOI

10.1109/SSP.2001.955306

Filename

955306