Startup builds on Wi-Fi chips for cheaper 'last mile' to home broadband

The technology from Mimosa Networks would send data from an access point on a tower or neighboring building to a small antenna on the customer's home. That could mean a much cheaper connection than running fiber or copper wires to each residence, an attractive proposition for service providers that want to compete with cable companies and carriers or get people in less developed countries online for the first time.

Wireless ISPs have used Wi-Fi for home broadband for years, but mostly in rural areas, partly because of interference issues in more dense neighborhoods. Mimosa took mass-produced, relatively low-cost chips built for Wi-Fi and modified them with its own protocol, which lets many users share time on a single channel, said Jaime Fink, founder and chief product officer at Mimosa, based in Campbell, California.

The Mimosa gear uses that protocol along with beam-forming features to point radio signals at individual homes. That lets it cover a whole neighborhood with transmitters placed one per kilometer or so, Fink said. In a typical setting, such a network could offer service of about 500Mbps (bits per second) both down to subscribers and back up to the Internet, he said. Mimosa has met with service providers in the U.S. and other countries and expects networks built with its technology to launch in the middle of next year.

Mimosa's system uses the same unlicensed 5GHz band as Wi-Fi for the main connections between access points and homes. That band offers many channels the network can use based on what other frequencies are in use nearby, and operating at rooftop level also helps to avoid interference. The special time-sharing protocol helps multiple customers use the same channel, because it's more reliable than the standard Wi-Fi method of handling spectrum, he said.

In an urban setting, the network could serve about 250 customers on one city block. Where needed, service providers could deploy a smaller access point on a customer's roof to avoid using another tower, offering that customer free access in return, Fink said.