Distributed and Adaptive Analog Coding for Video Broadcast in Wireless Cooperative System

Recently, some analog joint source-channel coding (AJSCC) schemes have been proposed to deal with cliff effect in wireless video broadcasting system. And wireless video broadcast with user cooperation tends to be a promising way to improve broadcast video quality in the near future. In this paper, we introduce a distributed and adaptive analog coding scheme called ACVC (adaptive cooperative video coding) based on AJSCC and with the concept of coset coding in distributed source coding, to improve the overall video broadcast quality in wireless cooperative system. Particularly, an adaptive packet discarding module is introduced to the framework to avoid video quality deterioration under severe channel conditions. And a model for quantization step selection of coset coding is built to minimize the redundancy in the cooperative signal and improve the anti-noise ability of the video. The experimental results show that, ACVC has stronger adaptability and thus obtains higher quality of broadcasted video than existing wireless cooperative schemes in the literature under different channel conditions.