SIMPLIFIED VITERBI PROCESSORS FOR THE GSM PAN-EUROPEAN CELLULAR COMMUNICATION-SYSTEM

The GSM cellular system provides the European countries with a common digital mobile radio structure for overland communications. This paper illustrates an implementation of a GSM receiver in which two reduced complexity Viterbi processors are used: the first one for the demodula tion of the GMSK signal and the second one for the decoding operations . The performance of the receiver is evaluated through a channel simul ator for mobile communications. The results show that in many cases th e proposed receiver allows the significant reduction of the computatio n complexity with respect to the classical Viterbi processor. In parti cular, for mean and high signal-to-noise ratios, a reduction of four t imes in the computational burden is obtained.