Multiplex communications – Communication over free space – Repeater
Patent
1996-04-10
1999-09-07
Nguyen, Chau
Multiplex communications
Communication over free space
Repeater
370344, 370484, 375200, H04B 7208
Patent
active
059497670
ABSTRACT:
A reception unit for receiving a frequency division multi-accessed signal based on not more than n (n is an integer) spread signals derived from spreading a carrier includes a conversion device for converting a received signal into a quantizable intermediate frequency band signal. Also included is a device for converting the intermediate frequency band signal into a digital signal and outputting a digital intermediate frequency band signal, n units of frequency converters respectively corresponded with n spread signals one by one for frequency converting the digital intermediate frequency band signal so that a center frequency of a corresponding spread signal among the n spread signals becomes 0 Hz, and n units of FIR filters respectively corresponding with the n spread signals one by one for passing only a corresponding spread signal among the frequency converted digital intermediate frequency band signals. A selector is provided for selecting and outputting signals outputted from the n units of FIR filters, a controller is provided for controlling frequency conversion conducted by the n units of frequency converters and filtering conducted by the n units of FIR filters, and a device is provided for inverse-spreading an output signal of the selector.
REFERENCES:
patent: 5136612 (1992-08-01), Bi
patent: 5278837 (1994-01-01), Kelley
patent: 5323391 (1994-06-01), Harrison
patent: 5396489 (1995-03-01), Harrison
patent: 5490173 (1996-02-01), Whikehart et al.
patent: 5715235 (1998-02-01), Sawahashi et al.
NEC Corporation
Nguyen Chau
LandOfFree
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