Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2007-09-11
2007-09-11
Tran, Khai (Department: 2611)
Pulse or digital communications
Spread spectrum
Frequency hopping
Reexamination Certificate
active
10386273
ABSTRACT:
A frequency hopping communication device has a memory memorizing modulation coefficients related to hopping frequencies of a carrier wave. Whenever a following hopping frequency is decided, a CPU reads out one of the modulation coefficients on the basis of the following hopping frequency from the memory and supplies it to a Gaussian filter. The Gaussian filter stores the read out modulation coefficient in a register and multiplies transmission data signal supplied thereto by the read out modulation coefficient stored in the register to produce a modulation signal. Thus, the modulation signal has voltage amplitude depending on the carrier frequency. A voltage controlled oscillator modulates the carrier wave having the following hopping frequency by the use of the modulation signal from the Gaussian filter and produces a transmission signal. Therefore, the transmission signal has an approximately uniform frequency deviation regardless of the carrier frequency.
REFERENCES:
patent: 6731101 (2004-05-01), Miyagawa et al.
patent: 6763055 (2004-07-01), Fry
patent: 1-243730 (1989-09-01), None
patent: 9-139694 (1997-05-01), None
patent: 11-274951 (1999-10-01), None
NEC Corporation
Scully , Scott, Murphy & Presser, P.C.
Tran Khai
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