Map Decoding Of Arithmetic Codes With A Forbidden Symbol
Marco Grangetto, Pamela C. Cosman · 2002
In this paper, a novel maximum a posteriori (MAP) technique for the decoding of arithmetic codes in the presence of transmission errors is presented. Arithmetic codes with a forbidden symbol and trellis search techniques are employed in order to estimate the best transmitted codeword. The viability of the proposed approach is demonstrated in the binary symmetric channel case in terms of both performance and decoding complexity. The results are compared with a traditional separated approach based on rate compatible convolutional codes. The MAP decoding is applied to the progressive transmission of SPIHT compressed images and competitive results in terms of average decoded quality are reported.