A METHOD FOR INFORMATION MODULATION AND DEMODULATION OF HIGH FREQUENCY BAND USAGE

摘要

A method for information modulation and demodulation of high frequency band usage is a method used as information modulation and demodulation of digital communication. This method uses binary information symbol to directly change a wave symmetry parameter of sine carrier wave, to make a very minimum of the wave difference between the modulated signal and sine signal, whose information transmission speed is equal to carrier wave frequency. The wave modulated by logic "0" is g(t,tau), while the wave modulated by g(t, T-tau) is logic "1": Formula (1). Herein T is cycle of signal wave and also is sign width and symbol width of information; however M/T is frequency of signal wave, and is equal to transmission speed of symbol on numerical value; such information speed may be equal to carrier wave frequency, while transmission signal is similar to sine wave. So the energy of frequency spectrum is concentrated highly, and used band width is very narrow, therefore frequency band usage is very high to realize high-speed data transmission of ultra narrow band.