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Digital frequency synthesizer/modulator for continuous phase modulations with slow frequency hopping

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1 Author(s)
Vankka, J. ; Lab. of Signal Process. & Comput. Technol., Helsinki Univ. of Technol., Espoo, Finland

This paper gives a description of a modulator for burst-by-burst carrier frequency hopping in TDMA systems. The architecture consists of a digital frequency synthesizer/modulator for a broad class of continuous phase modulations (CPMs) and a fast frequency settling RF synthesizer consisting of one phase-locked-loop (PLL). The performance of the digital frequency synthesizer/CPM modulator has been analyzed theoretically and simulated by a computer program. The analyses show that the proposed digital frequency synthesizer/CPM modulator achieves lower power consumption and spurious levels than the fast frequency hopping systems synthesizing digitally a full frequency band. In the computer simulations the effect of the digital frequency synthesizer/CPM modulator parameters on the power spectrum and the phase error is investigated

Published in:

Personal, Indoor and Mobile Radio Communications, 1996. PIMRC'96., Seventh IEEE International Symposium on  (Volume:3 )

Date of Conference:

15-18 Oct 1996

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