From the course: Wireless Networking Essential Training

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Frequency Division Multiplexing (FDM)

Frequency Division Multiplexing (FDM)

From the course: Wireless Networking Essential Training

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Frequency Division Multiplexing (FDM)

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- [Instructor] With direct sequence spread spectrum that we talked about in our previous video, we used the entire 22 megahertz frequency range of a channel to send a single bit, and there was a lot of overhead due to that Barker 11 coding scheme. A more efficient way to carry this data is to use frequency division multiplexing, or FDM. With FDM, our single channel is divided into non-overlapping sub-channels. In fact, we don't even use the entire 22 megahertz channel width. We only use a 20 megahertz channel width. And each of these sub-channels, they carry a different signal. This is really similar to how a cable TV system works, it carries different television shows over the same cable. Each show is on its own channel, in other words, each show has its own range or frequencies. However, there is a concern. Even though these frequencies are technically non-overlapping, they're right next to each other, and even…

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