An adaptive modulation and power-allocation algorithm in OFDM system

Author

Ying Li ; Guangchuan Su

Author_Institution

Dept. of Electron. Eng., Univ. of Beijing Inst. of Technol., China

Volume

1

fYear

2004

Firstpage

339

Abstract

Orthogonal frequency division multiplexing (OFDM) modulation scheme is adopted by more and more wireless communication systems to help achieve reliable and high-rate data transmission. Wideband wireless systems based on OFDM are limited in their performance by the dips in the frequency spectrum of the multipath fading channel. The performance of an OFDM-based system can be augmented by the adaptive loading and power-allocation of the subcarriers. Several algorithms have been developed, most of them based on high-complexity iteration. We develop a low-complexity and fast converging algorithm that guarantees integer bit rate. Simulation shows that the proposed adaptive algorithm improves the system performance considerably, more than 5 dB for BER under 10^-2.

Keywords

OFDM modulation; adaptive modulation; broadband networks; computational complexity; data communication; error statistics; fading channels; multipath channels; power control; radio networks; OFDM system; adaptive algorithm; adaptive loading; adaptive modulation; adaptive power-allocation algorithm; data transmission; fast converging algorithm; frequency spectrum; low-complexity algorithm; multipath channel; multipath fading channel; orthogonal frequency division multiplexing; wideband wireless systems; Adaptive algorithm; Bit error rate; Bit rate; Data communication; Fading; OFDM modulation; Power system reliability; System performance; Wideband; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems, 2004. ICCCAS 2004. 2004 International Conference on

Conference_Location

Chengdu

Print_ISBN

0-7803-8647-7

Type

conf

DOI

10.1109/ICCCAS.2004.1346086

Filename

1346086