Quang Q Vo

US Patent:

57990344, Aug 25, 1998

Filed:

Dec 6, 1995

Appl. No.:

8/568058

Inventors:

John S. Walley - Lake Forest CA
Quang D. Vo - San Dimas CA

Assignee:

Rockwell International Corporation - Newport Beach CA

International Classification:

H04B 1500
H04K 100
H04L 2730

US Classification:

375206

Abstract:

A frequency acquisition and compensation device and method for direct sequence spread spectrum communications systems has an identification (ID) sequence in an acquisition frame which is received by a receiving station and an ID sequence stored in an ID register. A received acquisition frame is demodulated using dot product and cross product demodulation. An ID detector detects the ID sequence in the demodulated dot product, cross product, or inverse cross product acquisition frame. When the ID is detected by the dot product demodulator, the receive frame timing is adjusted to coincide with a time interval when the ID was detected. Also, when the ID sequence stored in the ID register matches either the dot product, cross product or inverted cross product of the received ID sequence, the system microcontroller updates the automatic frequency control value.

US Patent:

62228749, Apr 24, 2001

Filed:

Jul 10, 1998

Appl. No.:

9/447538

Inventors:

John S. Walley - Lake Forest CA
Quang D. Vo - San Dimas CA

Assignee:

Conexant Systems, Inc. - Newport Beach CA

International Classification:

H04B 1707

US Classification:

375149

Abstract:

A frequency acquisition and compensation device and method for direct sequence spread spectrum communications systems has an identification (ID) sequence in an acquisition frame which is received by a receiving station and an ID sequence stored in an ID register. A received acquisition frame is demodulated using dot product and cross product demodulation. An ID detector detects the ID sequence in the demodulated dot product, cross product, or inverse cross product acquisition frame. When the ID is detected by the dot product demodulator, the receive frame timing is adjusted to coincide with a time interval when the ID was detected. Also, when the ID sequence stored in the ID register matches either the dot product, cross product or inverted cross product of the received ID sequence, the system microcontroller updates the automatic frequency control value.