超窄带技术UNB

melody

【文件名】:0673@52RD_Ultra Narrow Band Modulation.rar
【格　式】:rar
【大　小】:369K
【简　介】:The critics of Ultra Narrow Band Modulation methods ( those who say "you cannot do that") have all taken a fast look at the waveform, or spectrum, and said immediately that this is impossible. The critics are so numerous that a few of the Ultra Narrow Band investigators will not even answer their complaining E-Mail any more. UNB methods do work, and in some cases work very well. UNB hardware is in production for a number of uses.
【目　录】:无目录

melody

【文件名】:0673@52RD_3PRK.rar
【格　式】:rar
【大　小】:268K
【简　介】:A little known characteristic of abrupt digital phase modulation makes it possible to create a transmitted signal having no Bessel sideband products. The method enables the use of special ultra narrow bandpass filters, which have a bandpass less than 1/100 of the normally required Nyquist bandwidth. The C/N for a given BER compares favorably to that for BPSK modulation. The method is presently in use on a microwave link and with
experimental Cordless phones.
【目　录】:无目录