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A joint source-channel coding scheme (JSCC) for robust image transmission over wireless communication channel is proposed in this paper. In the proposed scheme, the set partitioning hierarchical trees (SPIHT) coder is modified to generate four different groups of bit stream relative to its significances. Moreover, an optimal unequal error protection (UEP) is suggested for data groups based on the channel distortion. The Low-Density Parity-Check (LDPC) is employed and analyzed in the proposed scheme as a channel coder. The idea of the proposed algorithm can be used with any scalable source coding technique. To demonstrate the efficiency of the proposed scheme, the simulation results are presented based on bit error rate (BER) and the Peak-signal-to-noise ratio (PSNR). Based on the simulation results, the proposed structure provides a significant improvement in bit error rate (BER) and PSNR performances.