Digital radio modulator

Details Digital radio modulator Digital radio modulator

1992-11-23

1995-06-13

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

375310, 375329, 332103, 329304, H04L 2718, H04L 2720, H04L 2722

Patent

active

054250552

ABSTRACT:
A radio modulator/demodulator particularly suitable for TDMA mobile telephone use employs digital techniques for GMSK phase modulation. Phase numbers representative respectively of an intermediate frequency carrier and modulation symbols are combined digitally to combination phase numbers which are subjected to a single folded cosine table to produce a digital trignometric sequence of numbers for modulating the transmitter. Economy of components and memory is achieved and some of the modulator components are used in demodulation which is effected by the single look-up table used in sine and cosine mode alternately.

REFERENCES:
patent: 4100369 (1978-07-01), Stenstrom et al.
patent: 4134072 (1979-01-01), Bolger
patent: 4550292 (1985-10-01), Smith
patent: 4584541 (1986-04-01), Nossen
patent: 4680556 (1987-07-01), Nakamura et al.
patent: 4962510 (1990-10-01), McDavid et al.
Patent Abstracts of Japan, vol. 5, No. 19, 4 Feb. 1981 & JP-A-55147060 (Nippon Denki) 15 Nov. 1980.
11th Annual IEEE Gallium Arsenide Integrated Circuit Symposium, 22-25 Oct. 1989, San Diego, Calif., pp. 49-52, La Macchia M.P. et al. "Flight GaAs Numerically Controlled Oscillator".

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