New 802.11ac WiFi chips will include multi-user MIMO to support more devices, faster speeds, and more efficient use of unlicensed spectrum.

Sarah Thomas, Director, Women in Comms

April 3, 2014

3 Min Read
Qualcomm Advances WiFi With MIMO

Qualcomm is the latest company to advance WiFi networking capabilities by announcing its support for the emerging 802.11ac standard with multi-user MIMO (MU-MIMO) antenna technology in a range of chips for routers/gateways and end-user devices.

Commonly referred to as "Gigabit WiFi," 802.11ac is the latest WiFi standard, approved in January this year, and operates in the 5GHz frequency band. It has been developed to enable faster connections than the 802.11n standard, which is already widely deployed, and is seen as a way to deliver HD video over wireless connections.

With its 802.11ac portfolio, Qualcomm Inc. (Nasdaq: QCOM) is borrowing a technology from the cellular world.

MIMO -- or multiple-input multiple-output -- involves the use of multiple transmitters and receivers to transfer more data simultaneously, thus accommodating more users at the same time. The introduction of MU-MIMO into the WiFi domain, which currently sends and receives data to only one device at a time, will enable access points (public, enterprise, or even in the home) handle more devices at once, doubling or even tripling their capacity, and optimizing the wireless connections. (See Holy HetNets! It’s Super Macros & Massive MIMO and Ready or Not, Here Comes 5G.)

According to Todd Antes, VP of product management at Qualcomm's Atheros division, typical access points have to subdivide their capacity for each new device that wants to connect. With MU-MIMO, access points can compute and form up to three separate beams talking to three clients at the same time, so delivering much greater capacity to end users.

"For service providers that have WiFi hotspots in public areas or enterprises that have WiFi in-building, this is very compelling," Antes says of MU-MIMO. "This is the most important feature in [802.11]ac for them. It allows them, in their network with an existing set of frequencies, to serve more clients or serve the same number with better throughput, and it leverages the assets they have in a better way, so they can make more money."

MU-MIMO is one of several features from release 2 of the Wi-Fi Alliance 's standard specifications for 802.11ac. Qualcomm Atheros division has been testing versions of the MU-MIMO spec for seven years, Antes says, but it wanted to be able to officially announce it with an ecosystem of partners. (See Wi-Fi Alliance Begins Certifying 802.11ac.)

That's because to take advantage of MU-MIMO, it has to be supported by devices and access points. For the most part, that will require new devices coming to market, but Antes says Qualcomm has been including MU-MIMO support in its devices with the Snapdragon 805 and 801 mobile processor, so that it will be able to turn it on with a software upgrade when needed.

At launch, Qualcomm's ecosystem includes chips for networking products (routers, gateways, and enterprise access points), smartphones, tablets, computers, consumer electronics, TVs, set-top boxes, and automobiles. Most will begin sampling in the second quarter. The chipmaker has also developed its own algorithms to manage the simultaneous connections, enabling WiFi networks to adapt on the fly to channel conditions, device movement, and application requirements.

This is only one of several WiFi advancements that have resulted in service providers taking the use of unlicensed spectrum a lot more seriously. Hotspot 2.0 developments are set to improve authentication on WiFi networks -- an important consideration if users are to be able to connect quickly and easily -- while, for its part, Qualcomm is also working on a technology to improve handoff, CnE, as well as a new innovation, LTE-U, that bonds WiFi with LTE for extra capacity bursts. (See Qualcomm Chips Away at Carrier Wi-Fi, Qualcomm Unveils WiFi Chip for Home Appliances, Jury Still Out on LTE-Unlicensed, Boingo Expands Hotspot 2.0 Trial to 23 Airports , and Hotspot 2.0 Makes Slow & Steady Progress.)

— Sarah Reedy, Senior Editor, Light Reading

About the Author(s)

Sarah Thomas

Director, Women in Comms

Sarah Thomas's love affair with communications began in 2003 when she bought her first cellphone, a pink RAZR, which she duly "bedazzled" with the help of superglue and her dad.

She joined the editorial staff at Light Reading in 2010 and has been covering mobile technologies ever since. Sarah got her start covering telecom in 2007 at Telephony, later Connected Planet, may it rest in peace. Her non-telecom work experience includes a brief foray into public relations at Fleishman-Hillard (her cussin' upset the clients) and a hodge-podge of internships, including spells at Ingram's (Kansas City's business magazine), American Spa magazine (where she was Chief Hot-Tub Correspondent), and the tweens' quiz bible, QuizFest, in NYC.

As Editorial Operations Director, a role she took on in January 2015, Sarah is responsible for the day-to-day management of the non-news content elements on Light Reading.

Sarah received her Bachelor's in Journalism from the University of Missouri-Columbia. She lives in Chicago with her 3DTV, her iPad and a drawer full of smartphone cords.

Away from the world of telecom journalism, Sarah likes to dabble in monster truck racing, becoming part of Team Bigfoot in 2009.

Subscribe and receive the latest news from the industry.
Join 62,000+ members. Yes it's completely free.

You May Also Like