A 96-Antenna System Tests the Next Generation of Wireless

Even as the world’s carriers build out the latest wireless infrastructure, known as 4G LTE, a new apparatus bristling with 96 antennas taking shape at a Rice University lab in Texas could help define the next generation of wireless technology.

The Rice rig, known as Argos, represents the largest such array yet built and will serve as a test bed for a concept known as “Massive MIMO.” MIMO, or “multiple-input, multiple-output,” is a wireless networking technique aimed at transferring data more efficiently by having several antennas work together to exploit a natural phenomenon that occurs when signals are reflected en route to a receiver. The phenomenon, known as multipath, can cause interference, but MIMO alters the timing of data transmissions in order to increase throughput using the reflected signals. Using scores or even hundreds of antennas increases capacity further by effectively focusing signals on individual users, allowing numerous signals to be sent over the same frequency at once. “If you have more antennas, you can serve more users,” says Lin Zhong, associate professor of computer science at Rice and the project’s co-leader. And the architecture allows it to easily scale to hundreds or even thousands of antennas, he says.