Digital radio modulator
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United States of America Patent
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Jun 13, 1995
Grant Date -
N/A
app pub date -
Nov 23, 1992
filing date -
Nov 30, 1991
priority date (Note) -
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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.
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