From the course: Cisco Networking Foundations: Wireless Networks, Services, Security, and Virtualization

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WLAN transmission methods

WLAN transmission methods

From the course: Cisco Networking Foundations: Wireless Networks, Services, Security, and Virtualization

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WLAN transmission methods

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- [Instructor] In this video let's discuss some of the transmission methods used in modern wireless LAN standards. Specifically we want to consider OFDM and OFDMA. To understand OFDM let's first consider FDM, frequency-division multiplexing. What we're doing here is using a channel width of 20 megahertz instead of the 22 megahertz channel width we saw with the 2.4 gig band, we're only using a 20 megahertz channel width, and the interesting thing is we can carry a binary bit, a one or zero, using two megahertz, so what we can do is take this 20 megahertz channel width and divide it into 10 different subchannels, and each subchannel can carry a binary bit, one bit for 10 different conversations, and theoretically, these subchannels should not interfere with one another because they're not overlapping in their frequencies, but it's really, really close, they're right next to each other. So to avoid any potential interference,…

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