Cross-polarization interference cancellation arrangement for digital radio channels
First Claim
1. A cross-polarization interference cancellation arrangement comprising:
- a first and a second input terminal capable of receiving a first and a second orthogonally polarized baseband digital input signal, respectively;
a first and a second output terminal;
canceller means connected to the first and second input terminals and responsive to a received first and second orthogonally polarized baseband input signal for determining therefrom a first and a second estimate, respectively, of a main lobe of a pulse response of the respective first and second input signals, and for generating from the first and second estimates a respective first and second cancellation output signal of a proper phase and amplitude which is introduced into the second and first orthogonally polarized input signals, respectively, to generate respective second and first canceller means output signals wherein the main lobe of an interfering orthogonally polarized signal is substantially cancelled; and
equalizer means responsive to the first and second canceller means output signals for substantially equalizing therein any intersymbol and cross-rail interference components for providing a resultant first and second equalizer means output signal to the first and second output terminals, respectively.
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Abstract
The present invention relates to a cross-polarization cancellation arrangement for digital radio channels wherein the cancellation arrangement comprises a canceller section and an equalizer section in cascade which operate at baseband. The canceller section includes both a main lobe estimator and detection circuits. The estimator provides a preliminary estimate of the main lobe of the pulse response in each of the two received orthogonally polarized signals. The detection circuits take each of the estimator means output signals, relating to each received polarized signal, and generates therefrom error control signals for adaptively updating the main lobe estimate signals from the estimator and also to provide an output signal which is used to cancel the interferer main lobe in the received oppositely polarized signal. The equalizer section then mitigates intersymbol and cross-rail interference in each of the orthogonally received signals.
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Citations
6 Claims
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1. A cross-polarization interference cancellation arrangement comprising:
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a first and a second input terminal capable of receiving a first and a second orthogonally polarized baseband digital input signal, respectively; a first and a second output terminal; canceller means connected to the first and second input terminals and responsive to a received first and second orthogonally polarized baseband input signal for determining therefrom a first and a second estimate, respectively, of a main lobe of a pulse response of the respective first and second input signals, and for generating from the first and second estimates a respective first and second cancellation output signal of a proper phase and amplitude which is introduced into the second and first orthogonally polarized input signals, respectively, to generate respective second and first canceller means output signals wherein the main lobe of an interfering orthogonally polarized signal is substantially cancelled; and equalizer means responsive to the first and second canceller means output signals for substantially equalizing therein any intersymbol and cross-rail interference components for providing a resultant first and second equalizer means output signal to the first and second output terminals, respectively. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification