Spread spectrum communication receiver with synchronizing circui

Details Spread spectrum communication receiver with synchronizing circui Spread spectrum communication receiver with synchronizing circui

1995-09-12

1998-12-15

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375208, H04B 1707

Patent

active

058504141

ABSTRACT:
A spread spectrum communication receiver includes an inverse spread demodulation circuit and a primary demodulation circuit. The inverse spread demodulation circuit has an image PN code generation circuit for generating an image PN code having an image relationship with a PN code which was used in spread modulation of a spread spectrum signal to be received and demodulated, an SS reference signal generation circuit for generating a spread spectrum reference signal having an image relationship with the spread spectrum signal to be demodulated using the image PN code, and a surface acoustic wave device for taking a correlation between the received spread spectrum signal and the spread spectrum reference signal. The primary demodulation circuit has a detection circuit for generating a convolution output by detecting the correlation output from said inverse spread demodulation circuit, and a waveform shaping circuit for shaping the convolution output. The receiver further includes a synchronization circuit for synchronizing a repetition period of the image PN code with the convolution output.

REFERENCES:
patent: 5038362 (1991-08-01), Takeuchi et al.
patent: 5038363 (1991-08-01), Mitsutsuka
patent: 5208830 (1993-05-01), Cornec et al.
patent: 5278864 (1994-01-01), Mori et al.
patent: 5668829 (1997-09-01), Saito

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