Demodulator for CDMA spread spectrum communication using multiple pn codes
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United States of America Patent
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Sep 22, 1998
Grant Date -
N/A
app pub date -
Feb 19, 1997
filing date -
Feb 19, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The demodulator has a plurality of matched filters in parallel. Each matched filter has a different binary PN code, a plurality of sample holders, a plurality of multipliers, an adder, and a controller. The sample holders has a common input, a switch, a first capacitor, a first inverse amplifier with an output and an input connected to the common input through the switch and the capacitor, and a first feedback capacitor for feeding the output of the first inverse amplifier back to the input. Each multiplier has a first and second sub-multiplexers, one of sub-multiplexer selecting corresponding sample holder output and another sub-multiplexer selecting a reference voltage.
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