Open Access

Layered Video Transmission on Adaptive OFDM Wireless Systems

EURASIP Journal on Advances in Signal Processing20042004:968950

Received: 28 February 2003

Published: 7 September 2004


Future wireless video transmission systems will consider orthogonal frequency division multiplexing (OFDM) as the basic modulation technique due to its robustness and low complexity implementation in the presence of frequency-selective channels. Recently, adaptive bit loading techniques have been applied to OFDM showing good performance gains in cable transmission systems. In this paper a multilayer bit loading technique, based on the so called "ordered subcarrier selection algorithm," is proposed and applied to a Hiperlan2-like wireless system at 5 GHz for efficient layered multimedia transmission. Different schemes realizing unequal error protection both at coding and modulation levels are compared. The strong impact of this technique in terms of video quality is evaluated for MPEG- video transmission.

Keywords and phrases

OFDMadaptive modulationbit loadingUEPMPEG-4

Authors’ Affiliations

IEIIT-BO/CNR, CNIT, DEIS, University of Bologna


© Dardari et al. 2004

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.