Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2005-05-10
2005-05-10
Le, Amanda T. (Department: 2634)
Pulse or digital communications
Receivers
Automatic frequency control
C375S226000, C375S326000
Reexamination Certificate
active
06891908
ABSTRACT:
A portable radio system, a portable radio equipment to be used in the same and a frequency error prediction method can be adapted to large frequency error by making tap number smaller and frequency error smaller. The portable radio system employs an automatic frequency control for detecting a frequency shift of an internal oscillator of a portable radio equipment with reference to a received wave transmitted from a base station having higher precision of frequency and adjusting the frequency of the internal oscillator by feeding back the frequency shift to the internal oscillator. Coordinate rotation digital computation (CORDIC) is employed for calculation of arctangent in the automatic frequency control.
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Matsu Moto Mariko
Ono Shigeru
Le Amanda T.
NEC Corporation
Ware Cicely
LandOfFree
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