From the course: Wireless Networking Essential Training

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Quadrature Amplitude Modulation (QAM)

Quadrature Amplitude Modulation (QAM)

From the course: Wireless Networking Essential Training

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Quadrature Amplitude Modulation (QAM)

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- [Narrator] We mentioned in the previous vide0 that we could reduce interference between adjacent sub-channels, by sending those sub-channels at right angles to one another. And in antenna theory, that's something that we can control. The angle of a transmission. Something else we can control is the amplitude, or the power, the height of a waveform. So let's say we created a grid, and for simplicity, let's just identify 16 points on this grid. Then, we could angle a waveform and adjust its amplitude, or its height, such that the top of a waveform would hit one of these 16 dots. Now, consider that number of 16. How many binary bits does it take to give us 16 different combinations? The answer's four. That means we could assign a unique four bit pattern to each of these dots. And that means, if we angle a waveform and adjust its amplitude to intersect with one of those dots, that single waveform could represent four…

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