From the course: Wireless Networking Essential Training

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Direct-Sequence Spread Spectrum (DSSS)

Direct-Sequence Spread Spectrum (DSSS)

From the course: Wireless Networking Essential Training

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Direct-Sequence Spread Spectrum (DSSS)

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- [Instructor] In WiFi networks, we might send one bit of data using a frequency range that spans two megahertz. However, we might run into interference because somebody else has a device like a Bluetooth game controller, or maybe a baby monitor that's running on the same frequency. And to help combat that potential interference, which could corrupt the binary bit we're trying to send, we could use an auto-correcting coding scheme called Barker 11 coding. Specifically, we're going to be using a wider range of frequencies. A 22 megahertz frequency range, and we're going to be sending 10 extra bits, meaning that we're sending a total of 11 bits. And those extra bits are called chips. And if there is interference, hopefully there will be enough surviving chips to allow the series of bits to be correctly interpreted as the original bit that we were transmitting. In this sequence of 11 bits that we're sending, each of which…

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