Effect of error distribution in channel coding failure on MPEG wireless transmission

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Abstract
This paper examines the interaction between digital video and channel coding in a wireless communication system. Digital video is a high-bandwidth, computationally intensive application. The recent allocation of large tracks of spectrum by the FCC has made possible the design and implementation of personal wireless digital video devices for several applications, from personal communications to surveillance. A simulation tool was developed to explore the video/channel coding relationship. This tool simulates a packet-based digital wireless transmission in various noise and interference environments. The basic communications system models the DAVIC (Digital Audio-Visual Council) layout for the LMDS (Local Multipoint Distribution Service) system and includes several error control algorithms and a packetizing algorithm that is MPEG-compliant. The Bit-Error-Rate (BER) is a basic metric used in digital communications system design. This work presents simulation results that prove that BER is not a sufficient metric to predict video quality based on channel parameters. Evidence will be presented to show that the relative positioning of bit errors, regardless of absolute positioning and the relative occurrence of these bit error bursts are the main factors that must be observed in a physical layer to design a digital video wireless system.

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