CROSS-POLAR INTERFERENCE CANCELLATION SYSTEM, WIRELESS STATION DEVICE, WIRELESS COMMUNICATION METHOD

摘要

A wireless station device determines whether a carrier to noise ratio of a vertical polarization wave is lower than a first threshold value, determines that a present modulation method for the vertical polarization wave is to be changed to another modulation method having a small multilevel number when the carrier to noise ratio of the vertical polarization wave is lower than the first threshold value, and transmits modulation method information to the facing wireless station device. Further, the facing wireless station device transmits a radio signal to the wireless station device using the modulation method indicated by the received modulation method information for the vertical polarization wave.

主权项

1. A cross-polar interference cancellation system including a wireless station device which performs a transmission and reception process with a facing wireless station device in two channels using both of a vertical polarization wave and a horizontal polarization wave of a radio signal at the same frequency, wherein:
the wireless station device determines whether a carrier to noise ratio of any one of the vertical polarization wave and the horizontal polarization wave is lower than a first threshold value, determines that a present modulation method for any one of the vertical polarization wave and the horizontal polarization wave determined to be lower than the first threshold value is to be changed to another modulation method having a small multilevel number when the carrier to noise ratio of any one of the vertical polarization wave and the horizontal polarization wave is lower than the first threshold value, generates modulation method information indicating the other modulation method with a small multilevel number, and transmits the modulation method information indicating the other modulation method with a small multilevel number to the facing wireless station device, and the facing wireless station device receives the modulation method information indicating the other modulation method with a small multilevel number, and transmits a radio signal to the wireless station device using the modulation method indicated by the received modulation method information for the vertical polarization wave or the horizontal polarization wave determined to be lower than the first threshold value in the wireless station device.