کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
525219 | 868901 | 2012 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Robust train-to-wayside video communications in tunnels using H.264 error-resilient video encoding combined with multiple antenna systems Robust train-to-wayside video communications in tunnels using H.264 error-resilient video encoding combined with multiple antenna systems](/preview/png/525219.png)
With the development of driverless metro systems, the demand for high data rate train-to-wayside wireless transmission is increasing drastically in order to satisfy operational needs such as maintenance, video surveillance of the inside of the trains and passenger information. Thus, the association of new transmission techniques such as new video coding techniques, multi antennas at transmission and reception sides and recent precoders provides technically and economically efficient solutions to improve existing systems. This paper presents and evaluates two novel strategies to enhance train-to-wayside wireless video transmissions in tunnels using realistic channel models obtained with ray tracing previously experimentally validated. Multiple Description Coding (MDC) or Region Of Interest (ROI) coding, using the new Flexible Macroblock Ordering (FMO) technique, is combined with appropriate Multiple Input Multiple Output (MIMO) schemes, namely, spatial multiplexing (SM), orthogonal spatial multiplexing (OSM) and precoded orthogonal spatial multiplexing (P-OSM) depending if full channel state information at transmitter side (CSI-T) is available or not. For each strategy, both video encoding process and MIMO algorithm are combined in an efficient way to provide the best video quality at the receiver with no increase of the number of radio access points along the infrastructure.
► We enhance the quality of wireless video transmissions for metro in tunnels.
► We compare two video coding strategies associated with MIMO and precoding techniques.
► The MIMO sub-channels are exploited depending on the availability of full CSI-T.
► MDC and ROI combined with MIMO provide good performance in high correlated channels.
► The POSM is a good trade-off between complexity of implementation and computing time.
Journal: Transportation Research Part C: Emerging Technologies - Volume 25, December 2012, Pages 168–180