Evaluation of a mobile radio multiple channel diversity receiver using pre-detection combining

An attempt to reduce multipath fading in UHF mobile radio communication by the use of a space diversity receiver has been made. A multiple channel 836 MHz predetection diversity combining receiver using phase equalization by multiple heterodyning has been built and evaluated. The fading range in the combined signal is greatly reduced over that in an individual signal and there is a significant difference in its statistical nature. In addition an improvement in receiver threshold with four channels combined was observed.