Equivalence relations between angle diversity and other diversity methods. Analytical model and practical results

Diversity reception is an efficient means to improve signal quality or to reduce outage time in radio-relay systems. Already well known from application in analogue and digital systems are space diversity (SD) and frequency diversity (FD). Also, angle diversity (AD) has found increasing interest for radio-relay due to its main advantages: need of one Rx-antenna only, and no waste of frequency band. Practical use of any countermeasure however depends on reliable planning tools which allow prediction of system performance and outage. One approach to make the efficiency of diversity predictable is to analyze correlation between main path and diversity path and to describe it by a correlation coefficient (CC). Analogies are developed between both FD and AD and SD and AD. Based on these analogies equivalence relations are derived analytically which allow one to compute the CC of AD from the better known and experimentally verified CCs of SD and FD