The term radio physics is defined as follows: this is the field of physics in which the physical foundations of radio engineering and contiguous divisions of engineering are studied. Since all practical applications of radio involve the use of electromagnetic oscillations and radio waves, the subject of radio physicsis the study of the processes involved in the excitation and transformation of electromagnetic oscillations,radiation and reception of radio waves and their propagation in various media. Radio-physics methods ofinvestigation find the widest application in various fields of science.These applications have facilitated the development of a series of fields which are sometimes veryfar from radio physics. As an example, let us indicate the investigation of the high layers of the atmosphere.Probing the earth’s atmosphere by means of radio waves provides information on the state of the ionosphereand on certain processes that occur in it. A new field of science — radio astronomy — has developedon the boundary between radio physics and astronomy. The use of radio-physics methods of investigationin studying the structure of matter has led to the development of radio-spectroscopy. As a result of theapplication of radio-physics methods to a study of the troposphere, radiometeorology has developed.Finally, the term radio electronics combines an aggregate of many fields of knowledge that has derived from radio engineering and electronics. Radio electronics includes radio communication in all itsforms, radio broadcasting, television, radio navigation, infrared signaling, radio astronomy, radiometeorology, radiospectroscopy, radio remote control, industrial electronics, electronics vacuum technology,semiconductor engineering, and much, much more.From the three def’mitions presented above it is evident that radio electronics is the broadest termoverlapping many divisions of radio engineering and radio physics, but it is simultaneously also less precise; this is all the more true because aside from the enumerated fields of radio engineering, radio physicsand radio electronics are becoming more and more distinguishable on the basis of their broad and deeppenetration into such fields of the newest science and engineering as atomic physics, astronautics, automarion and the application of new technological production and control processes, statistics, medicine,agriculture, and much more.Modern investigation of the macroworld and distant worlds and galaxies, as well as of the microworld of elementary particles, the structure of the atomic nucleus, and a number of new modern divisionsof physics would be completely impossible without the development of the experimental divisions of radiophysics, radio engineering, and radio electronics. As an example, we indicate the field of charged-particle acceleration in modern accelerators, the use of so-called synchrotron radiation that provides thepossibility of obtain~g the widest range of wavelengths from I to 1000 A for purposes of biology, solidstate physics, etc

Variance based OFDM frame synchronization
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