Pulse or digital communications – Repeaters – Testing
Patent
1998-05-13
1999-08-17
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375208, 375326, 375332, 375359, 375360, 375371, 375373, H04B 1500, H04K 100, H04L 2730, H04L 2714
Patent
active
059404353
ABSTRACT:
A method for configuring the receiver with an IF delay value that indicates the timing of symbol transitions in a received signal processed by the receiver. The receiver recovers a timing that has the same period as the symbol period, but which is out of phase with the received symbols. The received symbols are members of a constellation with elements that have purely I or purely Q components. A symbol-quality signal is generated by constructing the quantity .vertline..vertline.I.vertline.-.vertline.Q.vertline..vertline.. This quantity is a maximum when the detected symbols are aligned with the expected points in the symbol constellation, and decreases if the detected symbols are rotated away from these constellation points. The method determines an optimal delay value by which the symbol clock should be shifted from the recovered timing by using the symbol-quality signal to evaluate test delays and to successively refine them until the optimal delay value is found.
REFERENCES:
patent: 5680414 (1997-10-01), Durrant et al.
patent: 5689525 (1997-11-01), Takeishi et al.
patent: 5761239 (1998-06-01), Gold et al.
patent: 5844935 (1998-12-01), Shoji
Sklar, "Digital Communications: Fundamentals and Applications," P T R Prentice Hall, Englewood Cliffs, New Jersey, 1988, pp. 453-460.
Bharucha Cyrus F.
Chin Stephen
DSP Group Inc.
Hood Jeffrey C.
Maddox Michael W.
LandOfFree
Method for compensating filtering delays in a spread-spectrum re does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for compensating filtering delays in a spread-spectrum re, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for compensating filtering delays in a spread-spectrum re will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-322281