Etude et Simulation de FS-AMTuC pour le système de transmission OFDM

Abstract

work relates to the study of a new adaptive technique, Adaptive modulation and Turbo-coding ( AMTuC) under the context of wireless communication, by using the system of Orthogonal Frequency-Division Multiplexing (OFDM) over a Rayleigh channel. This strategy is based on the Fixed sub-channeling (FS), which exploits the wireless channel coherence band. Indeed, the method AMTuC uses multiples chemes of turbo-coded modulation, in order to adapt immediately the spectral efficiency to the variations of signalto-noise ratio (SNR) of the channel. The estimation of this last, for each frame, compared to a

set of obtained threshold, insures a binary error rate (BER) below a predefined threshold. The

associated modulation to every threshold is sent back to the transmitter, so that the adaptation

can be achieved.