Interference canceller

Details Interference canceller Interference canceller

1990-07-17

1991-02-12

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including polarized signal communication transmitter or...

455295, 455296, H01Q 2106, H01Q 2124, H04B 710

Patent

active

049927981

ABSTRACT:
In a digital radio transmission system for transmitting independent dual data by using cross polarization, an interference canceller detects cross polarization interference either directly or indirectly. An interference compensating signal is generated and applied to the main signal to cancel the interference element. In a case where no interference element is present, deterioration of cross polarization discrimination from an interference cancelling circuit is prevented by first determining whether an interference element actually exists and applying the interference compensating signal only when it does exist. The interference compensating signal can be attenuated based on the value of interference element so as to prevent undo deterioration of the cross polarization discrimination when the interference element is minimal.

REFERENCES:
patent: 4293945 (1981-10-01), Atia et al.
patent: 4321705 (1982-03-01), Namiki
patent: 4575862 (1986-03-01), Tahara et al.
patent: 4644562 (1987-02-01), Kavehrad et al.
IEEE Global Telecommunications Conference, Houston, Dec. 1-4, 1986, vol. 1, "Cross Polarization Interference Canceller for QAM Digital Radio Systems with Asynchronous Clock and Carrier Signals", by B. Lankl, pp. 523-529.
Patent Abstracts of Japan, vol. 10, No. 145 (E-407)[2202], May 28, 1986, and JP-A-61 5642 (Nippon Denki K.K.), 11-01-86.
Patent Abstracts of Japan, vol. 8, No. 231 (E-274)[1668], Oct. 24, 1984, and JP-A-59 112 738 (Nippon Denshin Denwa Kosha), 29-06-1984.

Affiliated with

Also associated with

Rating

Interference 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 Interference canceller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interference canceller will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-23004