Method and apparatus for generating plural quadrature modulated

Details Method and apparatus for generating plural quadrature modulated Method and apparatus for generating plural quadrature modulated

1995-01-31

1997-06-10

Chin, Stephen

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

375308, 455102, 332103, H04L 2736

Patent

active

056384017

ABSTRACT:
A transmitter includes a combiner for combining plural data signal sets into a single set of data signals. An I/Q modulator modulates the single sets of data signals onto for example an intermediate frequency (IF) carrier signal. A frequency upconverter converts the frequency of the IF signal to a radio frequency signal which, when amplified in a power amplifier, is transmitted via antenna. Using the present invention, plural sets of quadrature modulated signals separated in frequency are transmitted on a single RF carrier rather than on two carriers.

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IEEE, USA, pp. 420-424, vol. 1, XP000488585, Yamada et al., "A digitized group modulator using simple fractional sampling".

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