Rate allocation for joint source channel coding of the image over a wireless channel
Wu Cheng · Jounal of Xidian University · 2002
The influence of the source and channel coding rate on image quality is analyzed, and a rate allocation scheme for joint source channel coding of the progressive image over a wireless channel is proposed. In the scheme, a math model for the rate allocation of the progressive image is established, the solution of which is simplified, with the optimum allocation of the rate being realized by the Lagrange multipliers method on the condition that a certain constraint is satisfied. Simulations in the Rayleigh and GilbertElliot channel show that the scheme can obviously improve the performance when the SNR is low and offer a gain of about 02?dB when the SNR is high compared with the fix rate allocation scheme.