Spread spectrum communication device

Details Spread spectrum communication device Spread spectrum communication device

1991-06-11

1994-03-01

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 33, 380 34, 370 18, H04L 2730

Patent

active

052915158

ABSTRACT:
On the transmitter side, data to be transmitted are converted into a plurality of parallel data sets by a serial-parallel converter 101 and spread spectrum modulation is effected by means of PN code generators 105 and selectors 102. Each of the modulated outputs is delayed by a delaying circuit 103 with reference to a sounder channel and the phase thereof. The output thus delayed and the output of the sounder channel are added by an adder 104 to be multiplexed and transmitted.
On the receiver side, correlation between a received signal and a reference signal is formed by a correlator 201 to obtain a correlation pulse from the correlation output thus obtained. Data demodulation is effected by means of a sounder detecting circuit 209, a sampling pulse generating circuit 210 and an information detecting circuit 211, starting from this correlation pulse.
According to the structure described above, in SS communication, data demodulation can be effected with a high efficiency by using a single correlator.

REFERENCES:
patent: 4037159 (1977-07-01), Martin
patent: 4225935 (1980-09-01), Zscheile, Jr. et al.
patent: 4730340 (1988-03-01), Frazier, Jr.
patent: 5081643 (1992-01-01), Schilling
patent: 5093839 (1992-03-01), Kohno et al.

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