Bit allocation algorithm for multi-user adaptive OFDM system with adaptive trellis coded MQAM

Author

Song, Shenghui ; Hou, Chunping ; Cao, Dazhong

Author_Institution

Sch. of Electron. Inf. Eng., Tianjin Univ., China

Volume

3

fYear

2002

fDate

2002

Firstpage

1300

Abstract

In this paper, a multiuser adaptive OFDM (orthogonal frequency-division multiplexing) transmission system is simulated. A bit allocation algorithm is considered in this system We propose a DCA-DBA-DCA algorithm using the adaptive trellis coded modulation (ATCM) and compare its performance with fixed OFDM and other adaptive algorithms. The simulation shows that DCA can increase system performance by 5∼6 dB and our system can greatly reduce the computational cost while maintain a fairly good QoS. By changing the interval between two DCA (dynamic channel allocations) our system can be used in various environments.

Keywords

OFDM modulation; adaptive modulation; channel allocation; mobile radio; multiuser channels; quadrature amplitude modulation; quality of service; trellis coded modulation; ATCM; DCA-DBA-DCA algorithm; MQAM; QoS; adaptive trellis coded modulation; bit allocation algorithm; computational cost reduction; dynamic channel allocation; mobile communications; multiuser adaptive OFDM; orthogonal frequency-division multiplexing; simulation; system performance; Adaptive algorithm; Adaptive systems; Bit rate; Channel allocation; Computational efficiency; Computational modeling; Frequency division multiplexing; Modulation coding; OFDM modulation; System performance;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 2002. IEEE CCECE 2002. Canadian Conference on

ISSN

0840-7789

Print_ISBN

0-7803-7514-9

Type

conf

DOI

10.1109/CCECE.2002.1012938

Filename

1012938