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Digital Portable Transceiver Using GMSK Modem and ADM Codec

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3 Author(s)
Suzuki, H. ; Radio Commun. Lab., NTT Public Corp, Kanagawa, Japan ; Momma, K. ; Yamao, Y.

Digital mobile radio transmission techniques and integrated circuit devices have been developed for application to a digital portable transceiver utilizing narrow-band GMSK modulation and ADM voice coding. Design and performance of a quadrature type GMSK modulator and a single-chip coherent demodulator as the GMSK modem are described. To overcome slow fading, encountered in portable applications, switching diversity using a jitter detection type sensor is Proposed and shown to be effective. An experimental Portable transceiver, developed to demonstrate hardware feasibility, is also described.

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Selected Areas in Communications, IEEE Journal on  (Volume:2 ,  Issue: 4 )