Method and apparatus for generating constant envelope modulation using a quadrature transmitter
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United States of America Patent
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Jan 4, 2011
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app pub date -
Dec 30, 2006
filing date -
Dec 30, 2006
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Abstract
A multi-mode communication device (100) uses a quadrature transmitter (102) for transmitting both amplitude and constant envelope angle-modulated signals. For angle modulation, a separate feedback path is used from that used for amplitude modulated signal transmission. An FM receiver (136) is used to produce error signals (214, 216) used in correcting the I and Q quadrature signals (206, 208).
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