A double phase sweeping system for diversity reception in mobile radio: A.M. and F.M. analysis

Fading due to multipath propagation is a serious problem in mobile radio communications. Consideration is given to the theory of an effective means for combining the signals from a twin antennae space diversity arrangement using phase sweeping in opposite directions for the two antennae. An analysis is presented for various modulation methods. A mathematical model is also used to obtain results for practically realizable receiver characteristics. The resulting system should be compatible with existing receivers. Some experimental results for a commercial V.H.F./A.M. system are included.