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Robert Lacoste's The Darker Side by Robert Lacoste

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Chapter 13 Digital Modulations Demystified

Note: This chapter is a reprint of the article “The darker side: High-speed signal transmission—Digital modulations demystified,” Circuit Cellar, no. 233, December 2009.

Digital transmissions aren’t new. When I hooked my first 300-bps modem to my Apple II back in 1979, I spent hours just actually listening to the bits coming out of the phone and looking at the blinking LEDs, impressed to discover a new way of exchanging software and data without having to physically meet and swap floppy disks! Now I use roughly the same phone line but at a speed of 12 Mbps, thanks to my ADSL triple-play box. Similarly, on the wireless side we are now able to send more than 100 Mbps through a very-low-cost Wi-Fi link, ...

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