Method of, and receiver for, detecting the presence of data

Details Method of, and receiver for, detecting the presence of data Method of, and receiver for, detecting the presence of data

2005-06-07

2005-06-07

Corrielus, Jean B. (Department: 2637)

Pulse or digital communications

Receivers

Reexamination Certificate

active

06904102

ABSTRACT:
A method of, and a receiver for, detecting the presence of digitally modulated data signals in which the receiver is periodically energised to detect the presence of the signals. The received signals
oise are converted using a quadrature frequency translation stage (16, 17, 18) into a complex signal which after differential decoding (28) contain n samples for each transmitted bit. A running sum of successive groups of m samples, where m<n, is obtained and an absolute value (Xi) of each group is derived. A weighting value (Wi) is selected by comparing each absolute value with predetermined statistics of expected values and the weighting value selected is multiplied by the associated absolute value to produce a product (S). The product is compared in a comparator (56) with a further threshold level (58) to derive an indication of the presence of data in the received signals. If the indication is negative the receiver is powered down to save power.

REFERENCES:
patent: 5757845 (1998-05-01), Fukawa et al.
patent: 5838742 (1998-11-01), Abu-Dayya
patent: 5917794 (1999-06-01), Honma
patent: 5991273 (1999-11-01), Abu-Dayya
patent: 6069912 (2000-05-01), Sawahashi et al.
patent: 6081548 (2000-06-01), Saito
patent: 6363084 (2002-03-01), Dejonghe
patent: 6577686 (2003-06-01), Koga et al.

Affiliated with

Also associated with

Rating

Method of, and receiver for, detecting the presence of data 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 of, and receiver for, detecting the presence of data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of, and receiver for, detecting the presence of data will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3486268