How does the 802.11ac standard increase data rates through its use of channels and modulation?
What will be an ideal response?
The 802.11ac amendment increases data rates through the use of 80 and 160 MHz channels. In addition to using the same channel widths and subcarriers as 802.11n, 802.11ac includes 80 MHz channels divided into 242 subcarriers with 8 pilot subcarriers and 234 usable for data. A 160 MHz channel is divided into 484 subcarriers with 16 pilots and 468 usable. The amendment also specifies the use of 256-QAM modulation, although this requires an extra 5 dB of SNR to ensure reliable communications. However, it does away with the unequal modulation MCSs specified in 802.11n. With these channel configurations and 256-QAM modulation, 802.11ac can increase the data rates from 433 Mbps to roughly 6.9 Gbps, in addition to those data rates that can be achieved with 802.11n.
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