The book focuses on, firstly, the relevance and advantages of using a highly elliptical orbit (VEO) for satellite communications, including mobile, in geographical conditions of Russia, and secondly, diversity methods under the influence of interference and various kinds of fading: spatial - using adaptive antenna arrays, as well as transmission through several repeaters (satellite or terrestrial), and time (frequency-time) - based on repetition, packet coding, deep signal interleaving.