Demodulation system for spread spectrum communication

Details Demodulation system for spread spectrum communication Demodulation system for spread spectrum communication

1991-12-27

1993-08-24

Cain, David

Pulse or digital communications

Repeaters

Testing

H04K 100

Patent

active

052395561

ABSTRACT:
A demodulation system for spread spectrum communication includes a first low pass filter for processing an input spread spectrum signal including a product of an information signal and a first spread code. A second spread code is generated which is equivalent to the first spread code. A second low pass filter processes the second spread code and has a transfer function substantially equal to a transfer function of the first low pass filter. An absolute value circuit derives an absolute value of an output signal from the second low pass filter. A division circuit derives a reciprocal of an output signal from the absolute value circuit. A delay circuit delays the second spread code by a predetermined time. A first multiplier multiplies an output signal from the division circuit and an output signal from the delay circuit, and generates a third spread code in response to the output signals from the division circuit and the delay circuit. A second multiplier multiplies an output signal from the first low pass filter and the third spread code, despreading the output signal from the first low pass filter with the third spread code and recovering the information signal from the output signal of the first low pass filter.

REFERENCES:
patent: 4532635 (1985-07-01), Mangulis
patent: 4587661 (1986-05-01), Schiff
patent: 4617674 (1986-01-01), Mangulis et al.
patent: 4804938 (1989-02-01), Rouse et al.
patent: 5128957 (1992-07-01), Nakagawa

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