  This paper presents the comparison of compression algorithms for voice
transferring method over SMS in satellite communication. Voice transferring
method over SMS is useful in situations when signal strength is low and due to
poor signal strength voice call connection is not possible to initiate or
signal dropped during voice call. This method has one serious flaw that it
produces large number of SMS while converting voice into SMS. Such issue is
catered to some extend by employing any compression algorithm. In this paper
our major aim is to find best compression scheme for said method, for that
purpose we compare 6 different types of compression algorithms which are; LZW
(Lempel-Ziv-Welch), Huffman coding, PPM (Prediction by partial matching),
Arithmetic Coding (AC), BWT (Burrows-Wheeler-Transform), LZMA
(Lempel-Ziv-Markov chain). This comparison shows that PPM compression method
offers better compression ratio and produce small number of SMS. For
experimentation we use Thuraya SG-2520 satellite phone. Moreover, we develop an
application using J2ME platform[Ref:a]. We tested that application more than
100 times and then we compare the result in terms of compression ratio of each
algorithm and number of connected SMS produce after each compression method.
The result of this study will help developers to choose better compression
scheme for their respective applications.
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