An experiment on cross-polarization

fading and space diversity was conducted at 7.6 GHz over 29.07km path and the radiosonde was made in the mid-path. The experimental results show that the multipath fading and depolarization are serious in the central plains of China

the effect of depolarization on system performance is much more important than fading of signal level for double polarization frequency reuse communication system

the deep fading and depolurization in clear-air are caused by multipath due to atmospheric layer without the surface reflection

the high correlation and linear relaton with slope not to equal to-1 exist between the cross-polar discrimination XPD and Co-polar attenuation CPA

a significant improvement for deterioration of XPD and CPA can be obtained by space diversity .The experimental results agree well with the theoretical calculations on probability distribution of XPD and CPA.