Experimental studies on fading reduction by four‐direction antenna pattern diversity reception with variable multithreshold switching strategy
Tsutomu T. Takeuchi, Fumio Ikegami, Susumu Yoshida · Electronics and Communications in Japan (Part I Communications) · 1990
Abstract An antenna pattern diversity reception system was constructed experimentally as a means to cope with multipath fading in mobile communication, where the four‐direction antenna is used as the diversity branches, which themselves have the fading reduction effect. The variable threshold switching method is employed as the output scheme from the diversity branches. The switching algorithm for the four‐branch multithreshold reception is discussed. From the computer simulation based on the actually measured fading data, the optimal values for the parameters of the branch switching control algorithm are determined. A field experiment is made using the experimental system, and it is verified that the short‐term fading is improved in the actual multipath environment with the value close to the theoretical value, for the selection switching by four receivers using uncorrelated branches with Rayleigh distribution.