Pilot signal detection system using band reject filter

Details Pilot signal detection system using band reject filter Pilot signal detection system using band reject filter

1998-12-21

1999-11-16

Pascal, Robert

Amplifiers

With pilot frequency control means

330151, H03F 366, H03F 100

Patent

active

059864990

ABSTRACT:
A pilot signal detection system uses a band reject filter to reject the frequency band of at least one carrier signal to improve pilot signal detection. For example, in a feed forward distortion reduction system, the carrier signal(s) is on a main signal path along with a pilot signal which is injected into the main signal path at a frequency adjacent to the frequency band of the carrier signal(s). The carrier signal(s) and the pilot signal are amplified on the main signal path, resulting in distortion on the main signal path. To reduce the distortion from the main signal path, the feed forward distortion reduction system detects and reduces the pilot signal. To improve detection of the pilot signal, the pilot signal detection system provides a signal representative of the carrier signal(s) and the pilot signal with distortion from the main signal path onto a pilot detection path. A band reject filter on the pilot detection path rejects the frequency band of the carrier signal(s) while allowing the frequency of the pilot signal to pass through to pilot detect circuitry. Without the presence of the carrier signal(s), the pilot detect circuitry can more accurately detect the pilot signal on the pilot detection path. In response to the detected pilot signal, the pilot detect circuitry can provide control signal(s) to improve the reduction of the pilot signal by changing the relative phase and/or gain between the signals on the main signal path and the feed forward path. Thus, by improving the detection of the pilot signal, the pilot detection system improves the reduction of the pilot signal and thereby of the distortion.

REFERENCES:
patent: 4580105 (1986-04-01), Myer
patent: 4583049 (1986-04-01), Powell
patent: 4885551 (1989-12-01), Myer
patent: 4926136 (1990-05-01), Olver
patent: 5012490 (1991-04-01), Myer
patent: 5304945 (1994-04-01), Myer
patent: 5430893 (1995-04-01), Myer
patent: 5619168 (1997-04-01), Myer
patent: 5796304 (1998-08-01), Gentzler
patent: 5847603 (1998-12-01), Myer

Affiliated with

Also associated with

Rating

Pilot signal detection system using band reject filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pilot signal detection system using band reject filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pilot signal detection system using band reject filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1329304