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August 2011 [Systems & Subsystems] Sidebands Are Not Necessary Traditional communications systems rely on sidebands as the means of transmitting modulated signals. But this is not necessarily true for ultranarrowband (UNB) modulation methods. In fact, it can be shown by means of amplitude-modulated (AM) pulse testing that the sidebands are not essential for transmission or reception of AM pulse-modulated signals. In pulsed radar systems, sidebands at the transmitter are necessary because available filters cannot remove them. But ... December 2003 [Communications] Understanding Ultra Narrowband Modulation Modulation advances have fueled more efficient use of bandwidth, although conventional modulation formats still require allowance for upper and lower sidebands around the carrier frequency. Ultra narrowband modulation, however, is an efficient form... |
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