Pulse or digital communications – Transceivers – Modems
Patent
1996-03-08
1998-09-01
Ghebretinsae, Temesghen
Pulse or digital communications
Transceivers
Modems
375305, H04B 138
Patent
active
058021043
ABSTRACT:
A communications system includes a vector modulator controller receiving a data stream and developing a vector modulator control signal by GMSK waveform synthesis and a transmitter having a vector portion controlled by the vector modulator control signal. The vector modulator controller includes: (1) ROM memory storing a plurality of waveform maps including an alternating map, a constant map, a monotonic sine map, and a monotonic cosine map; (2) a counter coupled to the ROM memory and capable of developing a sequence of ROM addresses; (3) a temporal bit generator responsive to a data stream, the temporal bit generator developing a next bit Nb, a current bit Cb, and a past bit Pb from the data stream; (4) control circuitry to develop a digital waveform signal from selected waveform maps in the ROM memory; and (5) a pair of DACs responsive to the digital waveform signal and operative to output a vector modulator control signal that encodes the data stream. A method for providing a modulated control includes: (1) storing a plurality of waveform maps; (2) generating a plurality of temporal bits including a next bit Nb, a current bit Cb, and a past bit Pb from a data stream; (3) developing a series of addresses; (4) developing a digital waveform utilizing the Nb, Cb, and Pb bits and the sequence of digital outputs of the memory; and (5) converting the digital waveform signal to an analog vector modulator control signal that encodes the data stream.
REFERENCES:
patent: 4843351 (1989-06-01), Edwards et al.
Ghebretinsae Temesghen
VLSI Technology Inc.
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