Spread spectrum communication system

Details Spread spectrum communication system Spread spectrum communication system

1991-07-25

1992-08-04

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 375115, 375119, 375120, H04L 2730

Patent

active

051366142

ABSTRACT:
A spread spectrum communictdion system includes a transmitter and a receiver, and an on-off keying signal is inputted to the transmitter. A carrier signal is modulated by the on-off keying signal, and a spread spectrum signal is produced by multiplying a modulated signal by a first PN code which is repetition of 3-bit data. The spread spectrum signal is transmitted through a transmission antenna. In the receiver, a second PN code which is repetition of 4-bit data larger than the first PN code by 1 bit is generated. Therefore, a phase of the second PN code becomes coincident with a phase of the first PN code every 12 bits. Then, a spread spectrum demodulation is performed by multiplying a received spread spectrum signal by the second PN code to reproduce the carrier signal being modulated by the on-off keying signal. The on-off keying signal is restored by envelope-detecting a reproduced carrier signal.

REFERENCES:
patent: 3878527 (1975-04-01), Rensin et al.

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