Crosspolarization coupling measured for 800 MHz radio transmission in and around houses and large buildings

The scatter and reflectors that produce multipath propagation in the portable radiotelephone environment also scatter energy from the transmitted polarization into the orthogonal polarization. This crosspolarization coupling improves the signal quality on portable radio links by mitigating the effects of random antenna orientation and by providing an additional signal path for diversity combining. Measurements were made of crosspolarization coupling at 800 MHz within and around eight suburban houses and within two commercial buildings. Nearly complete coupling between polarization was seen for all propagation paths except for a few residential paths having high copolarized was seen for all propagation paths except for a few residential paths having high copolarized signal levels. Because of the high crosspolarization coupling, random orientation of portable radio sets will not cause significant degradation of signal quality.