Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-03-07
2006-03-07
Fan, Chieh M. (Department: 2638)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S150000, C375S343000
Reexamination Certificate
active
07010024
ABSTRACT:
A matched filter for implementing the correlation of an input signal and a reference signal. The matched filter comprises N parallel M-sample long shift registers for receiving an equal number of input signals at the sampling frequency of the input signal, wherein N2. The matched filter also stores K reference signals, wherein K2, and then multiplexes one of the input signals and one of the reference signals at a time to calculation logic by applying alternately at least one combination of the input signals and the reference signals to the calculation logic. The calculation logic may then calculate the correlation time-dividedly for each combination of an input signal and a reference signal so that correlation results calculated from different signals appear at the output of the calculation means as a sequence.
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Bert Gyselinckx et al. “A 4★2.5Mchip/s Direct Sequence Spread Spectrum Receiver with Digital IF and Integrated ARM6 CORE.” IN:IEEE 1997 Custom Integrated Circuites Conference, pp. 461-464.
Eerola Ville
Ritoniemi Tapani
Fan Chieh M.
u-Nav Microelectronics Corporation
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