Analysis and design of mobile terminal transmitters for mixed voice and data packets in the 800 MHz frequency band / prepared by S.A. Mahmoud, D. Falconer, M. El-Tanany, J. Wight. : Co22-652/1981E-PDF

"The implementation of an integrated voice/data communications system over mobile radio channels require the availability of two essential mobile terminal components: (1) a spectrum efficient modem with fast carrier and clock recovery circuits, and (2) an efficient low cost speech detector to suppress the RF carrier when no speech signal is generated at the audio input of the terminal. This report presents the design, implementation and testing results of fast clock and carrier recovery circuits to be used with a Tamed Frequency Modulator (TFM). The report also presents an approach for implementing a speech detector. The detector is simulated first using software algorithms run in real time with recorded mobile speech. The detector will then be implemented using the recently introduced signal processors on LSI chips (e.g. Intel 2920). An experimental RF subsystem is set up as a test bed for measuring the BER performance of the TFM system"--Abstract.

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