H - Electricity – 04 – B
Patent
H - Electricity
04
B
329/2
H04B 15/00 (2006.01) H04B 7/00 (2006.01)
Patent
CA 1282126
ABSTRACT In a digital signal demodulation system in a dual polarization radio system, having a first demodulator and a first A/D converter for a main signal, a second demodulator and a second A/D converter for an interference signal (cross polarization signal), a transversal filter for providing a compensation signal for cancelling an interference component in the main signal depending upon the demodulated interference component. The second A/D converter for providing the interference component in digital form is operated with a clock signal regenerated in the main signal branch so that the system operates correctly even when the main signal and cross polarization signal are in an asynchronous condition. The A/D converter is provided with an attenuator for compressing the amplitude of an input signal to avoid saturation of the circuit in case of fading and/or distortion, and a ROM table for correcting digitalized output after equalization and/or cancellation. Tap coefficients of the transversal filter are obtained by a control through a ZF (zero-forcing) method when inter-symbol interference is small, and a MLE (maximum level error) method when inter-symbol interference is large. Further, an integration constant for the tap coefficients is adaptive depending upon inter-symbol interference.
537424
Matsue Hideaki
Murase Takehiro
Ohtsuka Hiroyuki
Shirato Tadashi
Borden Ladner Gervais Llp
Nippon Telegraph And Telephone Corporation
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