Transmitting circuit and receiving circuit

Details Transmitting circuit and receiving circuit Transmitting circuit and receiving circuit

1993-09-27

1994-11-15

Swann, Tod R.

Pulse or digital communications

Repeaters

Testing

380 34, H04K 100

Patent

active

053655435

ABSTRACT:
In a first direct-sequence spread spectrum communication system having a transmission circuit where a data signal to be transmitted is coded by a first chip code signal and a receiving circuit for decoding the transmitted data signal with a second chip code signal, the synchronization between the said first and second chip code signals is performed when an asynchronous condition of said first and second chip code signals is detected over a predetermined interval. In a second direct-sequence spread spectrum communication system having a transmission circuit where a data signal having a variable data rate V to be transmitted is coded by a first chip signal having a data rate C and coded by a reference code signal having a data rate R, C>V, R>V. A receiving circuit receives the data signal from the above-mentioned transmission circuit decoded by a second chip signal and a second reference code signal. This receiving circuit has a lowpass filter and it is unnecessary to change the lowpass filter if the data rate V is lower than R. A third system combines these techniques.

REFERENCES:
patent: 4037159 (1977-07-01), Martin
patent: 4639932 (1987-01-01), Schiff
patent: 5111478 (1992-05-01), McDonald
patent: 5189683 (1993-02-01), Cowart
patent: 5245612 (1993-09-01), Kachi et al.
patent: 5299229 (1994-03-01), Zscheile, Jr. et al.

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