High performance coder: a possible candidate for the GSM half-rate system

Abstract

the results from a In this paper we describe our contribution to the ETSI effort for a definition of a GSM (Group Special Mobile) standard half-rate coding system for the pan-European digital mobile cellular radio system. The system consists of a speech coder and a channel coder. An overview of the speech coding algonthm is given. The results from a study of the different versions of the speech coder are described. A two-stage channel coding scheme as presented. The performance test results are shown. A brief overview of the DSP implementation, computational requirements and memory wage is also presented.For the GSM channel coding algorithm which of the coder with a typical mobfie-radio by both random and burst errors.A subjective listening test was pe performance of the candidate coder. presented in section 5. A real-time implementat on the AT&T DSP32C is overview o f t h e comPutati and DSP implementation