Adaptive cancellation of fixed interferers

An interference cancellation system for use in conjunction with a communication station having a main antenna for receiving signals from other communication stations wherein n interference sources are known, where n is an integer greater than 1, comprising:

• first through nth directional antennas, each having four (4) coplanar feeds, mounted proximate to said main antenna, wherein said directional antennas are each directed toward a respective first through nth known interference source, with said coplanar feeds being located one quarter to one half wavelength apart from each other;
• and
• an adaptive canceler coupled to said coplanar feeds and to said main antenna for producing an output signal substantially free from interference generated by the first through nth known interference sources, wherein said adaptive canceler includes:
• an output for coupling to an RF receiver of the communication station,
• a cancellation unit for producing a cancellation signal by weighting the signals received by said coplanar feeds and summing said weighted signals using a least mean square (LMS) algorithm;
• and
• a summer for summing said cancellation signal with signals received from said main antenna to produce said output signal.

A communication system including an interference cancellation system for use in conjunction with a communication station having a main antenna for receiving signals from other communication stations where at least one interference source is known comprising:

• a first directional antenna, having four (4) coplanar feeds, mounted proximate to said main antenna, wherein said directional antenna is directed toward a first known interference source, with said coplanar feeds being located one quarter to one half wavelength apart from each other;
• and
• an adaptive canceler coupled to said coplanar feeds and to said main antenna for producing an output signal substantially free from interference generated by the first known interference source, wherein said adaptive canceler includes:
• an output for coupling to an RF receiver of the communication station,
• a cancellation unit for producing a cancellation signal by weighting the signals received by said coplanar feeds and summing said weighted signals using a least mean square (LMS) algorithm;
• and
• a summer for summing said cancellation signal with signals received from said main antenna to produce said output signal.

A communication system including an interference cancellation system for use in conjunction with a communication station having a main antenna for receiving signals from other communication stations wherein n interference sources are known, where n is an integer greater than 1, comprising:

• first through nth directional antennas, each having four (4) coplanar feeds, mounted proximate to said main antenna, wherein said directional antennas are each directed toward a respective first through nth known interference source, with said coplanar feeds being located one quarter to one half wavelength apart from each other;
• and
• an adaptive canceler coupled to said coplanar feeds and to said main antenna for producing an output signal substantially free from interference generated by the first through nth known interference sources, wherein said adaptive canceler includes:
• an output for coupling to an RF receiver of the communication station,
• a canceller for producing a cancellation signal by weighting the signals received by said coplanar feeds and summing said weighted signals using a least mean square (LMS) algorithm;
• and
• a summer for summing said cancellation signal with signals received from said main antenna.