Digital radio modulator

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United States of America Patent

PATENT NO 5425055
SERIAL NO

07980541

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddress
NOKIA MOBILE PHONES (U K ) LIMITEDCAMBERLEY

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Blaker, David M Philadelphia, PA 22 921

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