Digital communication apparatus

Details Digital communication apparatus Digital communication apparatus

1996-12-11

1998-11-10

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375202, 375275, 375303, 370344, 370479, H04B 1500

Patent

active

058355294

ABSTRACT:
A highly reliable and high-speed data transmission is made by using an FH or MFSK mode as suitably selected according to the usage of channels. When a reception signal is entered into a receiver through a transmission line, (i) a signal processing unit supplies the spectrum intensity values of carrier frequencies, (ii) a channel detection unit controls the phase of a time slot based on the spectrum intensity values, selects the MFSK or FH modulation mode, and supplies reception code data corresponding to detected carrier frequencies, and (iii) a decoder supplies reception information data based on the reception code data. When transmission information data are entered into a transmitter, (i) a coding unit supplies, according to the selected modulation mode, transmission code data based on the transmission information data, (ii) a channel generation unit supplies, based on the transmission code data, carrier frequencies to be used and (iii) a waveform generation unit supplies a transmission signal to a transmission line.

REFERENCES:
patent: 4271524 (1981-06-01), Goodman et al.
patent: 4320514 (1982-03-01), Haskell
patent: 4392231 (1983-07-01), Henry
patent: 5166953 (1992-11-01), Hershey et al.
patent: 5410538 (1995-04-01), Roche et al.
patent: 5442660 (1995-08-01), Kuo et al.
G. Einarsson, "Address Assignment for a Time-Frequency-Coded, Spread-Spectrum System", Bell Systems Technical Journal, vol.59, No.7, pp. 1241-1255, Sep. 1980.
D. J. Goodman et al., "Frequency-Hopped Multilevel FSK for Mobile Radio", Bell Systems Technical Journal, vol.59, No.7, pp. 1257-1275 Sep. 1980.

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