Pulse or digital communications – Repeaters – Testing
Patent
1996-06-11
2000-08-15
Pham, Chi H.
Pulse or digital communications
Repeaters
Testing
375340, H04B 1500
Patent
active
061047481
ABSTRACT:
A receiving apparatus in a spread spectrum system includes a quadrature-demodulating section for demodulating a received signal in accordance with a clock signal to generate first and second quadrature components of an information signal and first and second quadrature components of a pilot signal and a spreading code generating section for generating a spreading code sequence which is the same as used on a transmission side, for each of the information signal first and second quadrature components and pilot signal first and second quadrature components in response to the clock signal. A despreading section despreads each of the information signal first and second quadrature components and pilot signal first and second quadrature components by use of the corresponding generated spreading code sequence. A clock signal generating section generates the clock signal in accordance with a frequency control signal to supply the clock signal to the quadrature-demodulating section and the spreading code generating section. A frequency control signal generating section generates the frequency control signal from the despread pilot signal first and second quadrature components.
REFERENCES:
patent: 5093841 (1992-03-01), Vancraeynest
patent: 5574754 (1996-11-01), Kurihara et al.
patent: 5666352 (1997-09-01), Ohgoshi et al.
patent: 5712869 (1998-01-01), Lee et al.
patent: 5745531 (1998-04-01), Sawahasi et al.
patent: 5768306 (1998-06-01), Sawahashi et al.
Bayard Emmanuel
NEC Corporation
Pham Chi H.
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