Title :
Efficient implementation of an I-Q GMSK modulator
Author :
Linz, Alfredo ; Hendrickson, Alan
Author_Institution :
Commun. Products Div., Adv. Micro Devices Inc., Austin, TX, USA
fDate :
1/1/1996 12:00:00 AM
Abstract :
An efficient implementation of GMSK modulators achieved by taking advantage of symmetry properties of the premodulation filter is described. The design bypasses typical processing steps such as modulating waveform ROM lookup, integration, and sine/cosine ROM lookup, and therefore does not introduce the related errors. A design for a cordless telephony IC with a bit rate of 72 kbps and 64 samples per symbol was implemented using only simple logic and 128×6 bits of ROM plus 2 simple 6b+sign DACs
Keywords :
Gaussian channels; cordless telephone systems; minimum shift keying; mobile radio; modulators; 72 kbit/s; DACs; I-Q GMSK modulator; bit rate; cordless telephony IC; premodulation filter; symmetry properties; Baseband; Bit rate; Digital modulation; Filters; Frequency modulation; Frequency shift keying; Phase modulation; Read only memory; Signal generators; Telephony;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
