Automatic gain control for reducing effects of jamming

Details Automatic gain control for reducing effects of jamming Automatic gain control for reducing effects of jamming

1991-11-01

1995-01-03

Eisenzopf, Reinhard J.

Telecommunications

Carrier wave repeater or relay system

Portable or mobile repeater

342 16, 342353, 455 331, 4552351, 455303, 455311, 455341, 327331, 327551, H04B 116

Patent

active

053794451

ABSTRACT:
Improved automatic gain control for an amplifier is obtained by controlling the size of a null zone in a drive signal for the amplifier. The size of the null zone is controlled by estimating strength of an interference signal, and dynamically varying the size of the null zone based on the estimated strength of the interference signal. As a result, the amplifier rarely saturates, regardless of signal strength. The invention is useful to reduce the harmful effects of jamming or interference.

REFERENCES:
patent: 3916406 (1975-10-01), Miller et al.
patent: 4250458 (1981-02-01), Richmond et al.
patent: 4355414 (1982-10-01), Inoue
patent: 4418363 (1983-11-01), Kelleher
patent: 4590600 (1986-05-01), Beeman et al.
patent: 4710723 (1987-12-01), Pelchat et al.
patent: 4739518 (1988-04-01), Bickley et al.
patent: 4907293 (1990-03-01), Ueno
patent: 4947256 (1990-08-01), Wood et al.
patent: 4955077 (1990-09-01), Sugayama
Nelson M. Blachman, "Bandpass nonlinearities," IEEE Trans. on Information Theory, vol. IT-10, Apr. 1964, pp. 162-164.
Donald S. Arnstein, "Power Division in Spread Spectrum Systems with Limiting," IEEE Transactions on Communications, vol. Com-27, No. 3, 1979.
P. W. Baier and K. J. Friederichs, "A Nonlinear Deivce to Suppress Strong Interfering Signals with Arbitrary Angle Modulation in Spread-Spectrum Receivers," IEEE Transactions on Communications, vol. Com-33, No. 3, Mar. 1985.
Laurence B. Milstein, "Interference Rejection Techniques in Spread Spectrum Communications," Proceedings of the IEEE, vol. 76, No. 6, Jun. 1988.
Ryuji Kohno et al., "Combination of an Adaptive Array Antenna and a Canceller of Interference for Direct-Sequence Spread-Spectrum Multiple-Access System," IEEE Journal on Selcted Areas in Communications, vol. 8, No. 4, May 1990.
Ye Hua and Wu Bo-Xiu, "A Robust Adaptive Filtering Algorithm with Variable Step Size," MILCOM '89 Session on Interference Suppression, Bedford, Mass. (Oct. 1989).
Young Kil Kwag, "An Adaptive Clutter and Interference Suppression with a Minimum Residue Noise Power," MILCOM '89 Session on Interference Suppression, Bedford, Mass. (Oct. 1989).
A. Gosser and M. Sust, "Adaptive Interference Rejection in a Digital Direct Sequence Spread Spectrum Receiver," MILCOM '89 Session on Interference Suppression, Bedford, Mass. (Oct. 1989).
Ralph F. Guertin, "Narrowband Interference Suppression in a Spread-Spectrum System Using Vector Space Methods," MILCOM '89 Session on Interference Suppression, Bedford, Mass. (Oct. 1989).
Eric D. Adler and Michael S. Patterson, "Adaptive Interference Rejection for Wide-Band Systems, " MILCOM '89 Session on Interference Suppression, Bedford, Mass. (Oct. 1989).
George J. Bloor and Robert P. Higgins, "Transient Response and Design Methodology of an Applebaum Adaptive Filter,"MILCOM '89 Session Interference Suppression, Bedford, Mass. (Oct. 1989).
R. Mendoza, J. H. Reed and T. C. Hsia, "Interference Rejection Using a Hybrid of a Constant Modulus Algorithm and the Spectral Correlation Discriminator," MILCOM'89 Session on Interference Suppression, Bedford, Mass. (Oct. 1989).
Bong Woon Lee and Dr. Joseph E. Essman, "On Interference Suppression using Complementary Filters in DS-SSS," MILCOM '89 Session on Interference Suppression, Bedford, Mass. (Oct. 1989).
Rajiv Vijayan and H. Vincent Poor, "Nonlinear Techniques for Interference Suppression in Spread-Spectrum Systems", IEEE Transaction on Communications, vol. 38, No. 7, Jul. 1990.
Nelson M. Blachman, "Detectors, Bandpass Nonlinearities, and Their Optimization: Inversion of the Chebyshev Transform", IEEE Transactions on Information Theory, vol. IT-17, No. 4, Jul. 19, 1971.

Affiliated with

Also associated with

Rating

Automatic gain control for reducing effects of jamming does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic gain control for reducing effects of jamming, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic gain control for reducing effects of jamming will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2218487