Communication apparatus

Details Communication apparatus Communication apparatus

1996-12-11

2000-06-20

Vu, Huy D.

Multiplex communications

Communication over free space

Combining or distributing information via time channels

370503, 375344, 375362, 4551922, 455231, 331 34, 329318, H04J 306, H04B 118, H04B 106, H04B 700

Patent

active

060785780

ABSTRACT:
There are a receiving unit for receiving a TDMA signal which is FSK (FM) modulated by a signal containing known information, and a demodulating unit 103 for demodulating received data. The demodulating unit 103 outputs a demodulated signal in a direct connection to a C-coupling. A C-coupling demodulation signal is inputted to a synchronization detecting unit 105, and a directly connected demodulation signal is inputted to an AFCBU 106. After a power supply is turned on, the C-coupling demodulation signal is inputted to the synchronization detecting unit 105. The demodulation signal whose synchronization state is being detected is inputted to the AFC unit 106 in a parallel condition and in a direct connection condition. After the synchronization signal is detected, a frequency offset correction is applied to thereby change a frequency offset of the frequency-converted signal by a carrier wave frequency converting section 10. After that, the demodulation signal is inputted to a data processing unit in a direct connection condition.

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patent: 4887050 (1989-12-01), Borth et al.
patent: 5027352 (1991-06-01), Goode
patent: 5287388 (1994-02-01), Ogura et al.
patent: 5450442 (1995-09-01), Umemoto et al.
patent: 5724653 (1998-03-01), Baker et al.

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