Telecommunications – Receiver or analog modulated signal frequency converter – Modulation distortion or cross talk correction or elimination
Patent
1982-09-09
1984-10-23
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Modulation distortion or cross talk correction or elimination
343361, 455 60, 455305, H04B 112
Patent
active
044792581
ABSTRACT:
A cross-polarization crosstalk canceller is equipped to receive two polarized waves which are orthogonally crossing each other. The cross-polarization interference is eliminated by multiplying the signal received on one side by a compensating coefficient and adding the resulting product to the signal received on the other side. A discrimination error represents the difference between the reception signal after compensation and the identified value thereof. An adder and a subtractor supplies the sum and the difference between the real part and the imaginary part of the discrimination error. A discriminator detects equality between the absolute values of the real part and the imaginary part of the signal received on the interfering polarized wave side and supplies a control signal depending on the quadrant to which the signal belongs. A switch combines and varies a combination of the signs of the outputs of the adder and subtractor in response to the control signal supplied by the discriminator. A low-pass filter smooths the output of the switching in order to give the compensation coefficient.
REFERENCES:
patent: 3646448 (1972-02-01), Harmon, Jr. et al.
patent: 3986123 (1976-10-01), Tirro et al.
A Simple Adaptive Equalizer for Efficient Data Transmission, by: Donald Hirsch and W. J. Wolf, IEEE Transactions on Communication Technology, vol. Com. 18, No. 1, Feb., 1970.
Adaptive Receiver for Cross-Polarized Digital Transmission, by: Junji Namiki and Shigeru Takahara, International Conference on Communications, Jun. 14-18, 1981.
New Automatic Polarization Cancelling Control for Multiple-Station Satellite Communication Systems, by: Lin-shan Lee, Ph.D, International Conference on Communications, Jun. 4-7, 1978.
Bookbinder Marc E.
Nippon Electric Co. Ltd.
LandOfFree
Cross-polarization crosstalk canceller does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cross-polarization crosstalk canceller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cross-polarization crosstalk canceller will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1602994