Adaptive cross-polarization interference cancellation arrangements

An adaptive cross-polarization interference cancellation arrangement comprising:

• an antenna (100) capable of receiving a signal which may include a first desired signal (102) polarized in a first direction and a second interfering signal (104) polarized in a second direction orthogonal to the first direction and comprising cross-polarization components thereof;
• means (105) coupled to the antenna capable of separating the received signal into third and fourth signals comprising only components of the received signal including the first and the second polarization directions, respectively, and transmitting the third and fourth signals along respective first (106) and second (107) paths;
• means (114) capable of adjusting the phase and amplitude of the fourth signal in the second path in response to control signals;
• means (110) capable of combining the third and the adjusted fourth signals to generate an output signal which primarily includes the first desired signal;
• and
• means (124) capable of generating the appropriate control signals to the adjusting means to appropriately adjust the amplitude and phase of the fourth signal
• characterized in that
• the generating means (124) comprises:
• means (120, FIG. 1;
• 172, 179, 180, FIG. 5) coupled to the output of the combining means capable of extracting a sample of the cross-polarization components of the second interfering signal remaining in the output signal from the combining means;
• power detection means (123, FIG. 1;
• 181, FIG. 5) capable of generating an output signal representative of the power envelope of the output signal of said extracting means;
• and
• a processor (124) capable of generating the appropriate control signals, in response to the output signal from said power detection means, for transmission to the adjusting means for appropriately adjusting the phase and amplitude of the fourth signal to achieve maximum cancellation of cross-polarization components of the second interfering signal in the third signal at the output of the combining means.