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Dual-polarization-transmission-system

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Dual polarization transmission system

Details

Inventors: Koizumi, Yutaka; Maeda, Shigeki;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Blum; Theodore M.
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn Macpeak & Seas

A dual polarization transmission system for transmitting digital modulated signal each having a particular bandwidth by use of two polarized waves which have the same center frequency and are orthogonal to each other. The receiver side of the system demodulates radio frequency signals sent by a horizontally and a vertically polarized wave and coming in through a receiving antenna into IF signals. From the received signal of one polarization, an interference component of the other polarization generated on the basis of the cross-polar IF signal or demodulated signal is removed.

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a dual polarization transmission system capable of transmitting digital modulated signals having different bandwidths by different radio waves having the same center frequency, while surely cancelling cross polarization interference components.
According to the invention, there is provided a dual polarization transmission system transmitting digital modulated signals having two different bandwidths by two orthogonal radio waves which have the same center frequency and are orthogonal in polarization, the system comprising, at a receiver side, interference cancelling means for removing interference components leaked from a cross-polar wave from a co-polar received signal.

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