May 2010
Beginner to intermediate
264 pages
7h 26m
English
Content preview from Digital Signal Processing 101Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CHAPTER 11Digital Upconversion and Downconversion
Previously, we discussed complex modulation and baseband signals. The whole point of this discussion is to create a signal that can be used to carry the information bits from one location to another, whether over copper wire, a fiber-optic cable, or electromagnetically through the air. In nearly all cases, the signal needs to ride on a carrier frequency to be efficiently sent from one location to another. To do this, the signal frequency spectrum needs to be able to be moved up and down the frequency axis at will. This is a process of (frequency) upconversion and downconversion. All early methods used analog circuits to accomplish this task. In the past couple of decades, digital circuits, particularly ...
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