Pushing capacity and performance improvements.
IEEE 802.11ac is the next evolution of Wi-Fi—to push capacity
into Gigabits-per-second in order to meet the 1000x challenge. 11ac mandates operation in the 5 GHz
band where there is relatively less interference and more channels are
available, compared to the 2.4 GHz band used by previous 11 a/b/g/n standards.
11ac uses wider bandwidth and up to eight spatial streams to achieve a maximum
of 6.93 Gigabits-per-second theoretical throughput. 11ac also enables new use
cases such as multiple HD video streams throughout the home by improving
spectral efficiency.
With an ever-increasing number of Wi-Fi-enabled devices present
in enterprise and home (i.e., higher attach rates) 11ac is the ideal evolution
in the Wi-Fi standard, using advanced techniques that leverage spectral
efficiency and higher bandwidth, ultimately providing needed capacity and
performance gains. Qualcomm VIVE includes an entire ecosystem of 11ac
solutions that will accelerate the transition to next-generation of Wi-Fi.
11ac is
fully backward compatible with 802.11n. It operates in the 5 GHz band and uses
up to 160 MHz bandwidth. In addition, it uses spatial division multiple access
(SDMA) techniques to enable multi-user MIMO or MU-MIMO. Operating in 5 GHz band
reduces interference and antenna size requirement, allowing for smaller antenna
sizes for portable devices, leveraging wider bandwidths (20, 40, 80, and
optional 160 MHz) and increases in data rates.
We have
demonstrated MU-MIMO PHY operation running on a prototype 11n module with a
MU-MIMO software overlay. Results showed a 3x improvement in PHY rates compared
to 11n. This is shown in this video (link).
All of the above features have been standardized in IEEE under
11ac which are explained in this white paper (link). Qualcomm Research, along
with other participants, lead the standardization efforts for these features.
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