Spread-spectrum communication system

Details Spread-spectrum communication system Spread-spectrum communication system

1991-03-04

1993-01-05

Cain, David

Pulse or digital communications

Repeaters

Testing

380 48, H04L 900

Patent

active

051777673

ABSTRACT:
In order to eliminate the need for spread-spectrum code synchronization, a code divided into a suitable number of digits is applied to a transmitter and a receiver. The transmitter multiplies an original signal by each subdivision of the code to produce n-number of new baseband signals. Carrier waves having n-types of frequencies are modulated by these signals and the modulated signals are added to obtain an ultra-wide band signal, which is then transmitted to the receiver. The receiver separates the received signal into the narrow band components which prevailed prior to the adding operation in the transmitter, and then demodulates each component into a baseband signal. Each of these demodulated signals is multiplied by a code the same as that on the transmitting side, whereby n-number of original signals are obtained. Original signals obtained from a signal spread by a code different from that of the receiver are not n in number. Thus, spread-spectrum communication can be realized without requiring spread-spectrum code synchronization.

REFERENCES:
patent: 4071692 (1978-01-01), Weir et al.
patent: 4837823 (1989-06-01), Ham et al.
patent: 4941150 (1990-07-01), Iwasaki

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