A Wimax Solution for Real-time Video Surveillance in Public Transport

Video surveillance is a highly useful tool to the public transport authorities, which is now widely used as a measure to ensure passenger safety and security. While video surveillance application in static environments like airports, shopping malls, train stations has been a huge success, real-time video surveillance in moving public transport experiences serious technological challenges mainly due to low data rates at vehicular speeds offered by existing communication technologies. Success of live video surveillance in public transport depends on future communication technologies. WiMAX has emerged as an exciting technology with promises to offer high throughput, a key requirement for video surveillance in public transport. WiMAX, however, offers limited throughput at high vehicular speeds mainly because of multipath fading that causes high bit error rate at the receiver. In this paper, we propose a forward error control (FEC) scheme for WiMAX that proactively and dynamically adjusts the size of extra parity bits of error correcting codes for real-time applications like video surveillance based on the estimated bit error probability at various vehicular speeds. We further propose a model to improve the utility gain of a live video surveillance system in public transport that uses WiMAX technology. Simulation results confirm that the proposed scheme significantly improves the throughput and utility of the video surveillance system in public transport.