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-4 video transmission.
Layered Video Transmission on Adaptive OFDM Wireless Systems / D. Dardari; M. G. Martini; M. Mazzotti; M. Chiani. - In: EURASIP JOURNAL ON APPLIED SIGNAL PROCESSING. - ISSN 1110-8657. - STAMPA. - 10:(2004), pp. 1557-1567. [10.1155/S1110865704403102]
Layered Video Transmission on Adaptive OFDM Wireless Systems
DARDARI, DAVIDE;MARTINI, MARIA GIUSEPPINA;MAZZOTTI, MATTEO;CHIANI, MARCO
2004
Abstract
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-4 video transmission.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
