CHARACTERISTICS OF VIDEO COMMUNICATION-SYSTEM IN MOBILE RADIO CHANNEL

This paper describes the performance of a video communication system o ver 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 e rror. To control this error, an automatic repeat request (ARQ) scheme is often employed, however, this incurs a cost. The benefit of a non-d egraded reconstructed video sequence is offset by the transmission del ay due to ARQ retransmission. We apply to a video communication system a selective-repeat ARQ which is combined with the coding control sche me to reduce the transmission delay. We evaluate the quality of the re constructed video sequence and transmission delay using computer simul ations and make clear its applicability over Rayleigh and Nakagami-Ric an fading channels and intersymbol interference.