Multiplex communications – Phase modulation
Reexamination Certificate
2005-01-18
2005-01-18
Ho, Duc (Department: 2665)
Multiplex communications
Phase modulation
C370S252000, C455S112000, C455S114200, C455S216000
Reexamination Certificate
active
06845083
ABSTRACT:
A transmitter108converts a digital baseband signal input150for transmission by an antenna114to support multiple communication standards. An over-deviation phase multiplier130increases signal phase deviation by a factor of M. A digital phase modulator176applies trigonometric lookup tables. A digital intermediate frequency up-converter132up-shifts frequencies of desired signal content. First and second digital-to-analog converters (DACs)134and136use relatively low-bit operations, which add DAC noise212. First and second low pass filters138and140apply rejection above frequencies of desired signal content. An analog I/Q modulator142converts from complex to real signals, adding an unwanted signal spaced from the desired signal content by an intermediate frequency multiple. A limiter144reduces amplitude modulated noise. An over-deviation phase divider146divides signal phase deviation by 1/M to reduce phase modulated noise.
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Mollenkopf Steven M.
See Puay Hoe Andrew
Walker Brett C.
Bachand Richard
Brown Charles
Ho Duc
Nguyen Phuongchau Ba
Qualcomm Incorporated
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