Matthew James Fischer

Improved MU-MIMO performance for future 802.11 systems using differential feedback

Multiuser MIMO (MU-MIMO) is a new technology adopted in IEEE 802.11ac for enhancing downlink throughput. 802.11ac has an explicit feedback mechanism that enables very high quality channel feedback to be provided to the transmitter, but the overhead can be quite substantial. We propose a differential feedback method that significantly reduces this overhead by using a simple lossless, variable-length compression technique that exploits the slowly time varying wireless channel.

A 2×2 MIMO baseband for high-throughput wireless local-area networking (802.11n)

This article consists of a collection of slides from the authors conference presentation on a 2X2 MIMO basedband system for high throughput wireless local area networking. Some of the specific topics discussed include: the demand for wireless LAN, 2000-2011; schemas of multipath channels; exploiting multipath processing for high rates and the impact on energy capacity planning; system architecture for MIMO-ODFM; system processing capabilities and performance summaries; the need for flexible transceivers; and block diagrams and system topologies.