Performance evaluation of adaptive OFDM systems in time-varying channels

Author

Haixia Zhang ; Dongfeng Yuan ; Ci Song ; Xinying Gao

Author_Institution

Sch. of Inf. Sci. & Eng., Shandong Univ., China

Volume

1

fYear

2004

Firstpage

322

Abstract

One of advantages of the OFDM transmission technique is that it has the inherent flexibility to adapt the modulation scheme on each subcarrier according to the signal-to-noise ratio (SNR) on the subcarrier, leading to an adaptive OFDM (AOFDM) system. We proposed a coded AOFDM system in a time-varying channel. By choosing an optimal M-QAM modulation scheme used by a subcarrier on the instantaneous channel knowledge, we extensively investigate the bit-error-rate (BER) performances of AOFDM systems with different vehicle speeds, modulation schemes and bit rates under Rayleigh fading channels.

Keywords

OFDM modulation; Rayleigh channels; adaptive modulation; error statistics; mobile radio; modulation coding; quadrature amplitude modulation; time-varying channels; BER; M-QAM modulation scheme; Rayleigh fading channels; SNR; bit-and-power allocation; bit-error-rate; coded adaptive OFDM systems; instantaneous channel knowledge; signal-to-noise ratio; time-varying channels; vehicle speed; Adaptive systems; Bit error rate; Bit rate; Channel capacity; Fading; Intersymbol interference; OFDM modulation; Signal to noise ratio; Time-varying channels; Vehicles;

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.2004.1346080

Filename

1346080