Abstract: A new multiple description video coding system for wireless ad hoc networks is proposed. When fast motion of
video contents is detected, a reference frame will be inserted into the descript
ion selection array adaptively in the proposed scheme, which improves the coding
efficiency of motion estimation and protects the bit stream from error propagat
ion. The multiple description layered coding method based on the proposed adapti
ve reference insertion (called ARIMDLC) is described in detail, which generate
s the base layer and enhancement layers for each description, making the video b
it stream more robust and suitable to the drastic network bandwidth fluctuation.
According to the characteristics of the ad hoc multihop network, a multipat
h transmitting strategy is designed for the ARIMDLC data packets, and three st
ates Markov process is used to model the wireless channel. Simulation results sh
ow that the proposed scheme can obviously improve the performance and offer an a
verage gain of 1.6dB in PSNR.

Key words: MDC, LC, adaptive reference insert, MDLC, Ad hoc