Characteristics of Video Communication System in Mobile Radio Channel

Naoto MATOBA  Yasushi KONDO  Masaki YAMASHINA  Toshiaki TANAKA  

IEICE TRANSACTIONS on Communications   Vol.E80-B   No.8   pp.1175-1181
Publication Date: 1997/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Mobile Computing)
mobile communication,  video transmission,  H.263,  ARQ,  fading channel,  

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This paper describes the performance of a video communication system over mobile radio channels. Mobile channel quality changes rapidly due to various factors. When compressed video data is transmitted through these channels, it is indispensable to employ an error control scheme because reconstructed video quality is seriously degraded by channel error. To control this error, an automatic repeat request (ARQ) scheme is often employed, however, this incurs a cost. The benefit of a non-degraded reconstructed video sequence is offset by the transmission delay due to ARQ retransmission. We apply to a video communication system a selective-repeat ARQ which is combined with the coding control scheme to reduce the transmission delay. We evaluate the quality of the reconstructed video sequence and transmission delay using computer simulations and make clear its applicability over Rayleigh and Nakagami-Rican fading channels and intersymbol interference.