This paper addresses the issue of robust and joint source-channel decoding of quasi-arithmetic codes. Quasi-arithmetic coding is a reduced precision and complexity implementation of arithmetic coding. This paper provides rst a state model of a quasi-arithmetic decoder for binary and M-ary sources. The design of an error-resilient s o f t decoding algorithm follows quite naturally. The compression e ciency of quasi-arithmetic codes allows to add extra redundancy in the form of markers designed

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... eci cally to prevent de-synchronization. The algorithm is directly amenable for iterative source-channel decoding in the spirit of serial turbo codes. The coding and decoding algorithms have been tested for a wide range of channel signal-to-noise ratios. Experimental results reveal improved SER and SNR performances against Hu man and optimal arithmetic codes.