Improved joint source-channel coding based on SPIHT

This paper presents a joint source-channel coding scheme of improved SPIHT algorithm combined with unequal error protection. Source coding to improve the SPIHT algorithm, the L set materiality judgment, using Z scanning sequence, highlights the low frequency information, important degree, preferred to scan frequency; channel coding by irregular quasi-cyclic, using different code rate and the number of iterations code, the full implementation of unequal error protection of important information, secondary information and other important information, have extremely strong error control. Simulation results show that, the united coding algorithm with quality performance in low SNR, at high SNR, and can realize and performance error protection is basically the same, the SNR curve, the effect is quite prominent.