MIMO DMT Testbed

1
Mitigation of Radio Frequency Interference (RFI)
Generated by the Computation Platform
Kapil Gulati, Marcel Nassar, Arvind K. Sujeeth,
Navid Aghasadeghi and Prof. Brian L. Evans
Goal Develop offline/online algorithms to reduce
RFI from clocks and busses in laptop embedded
wireless transceivers
Standard Carrier (GHz) Wireless Networking Example Interfering Clocks and Busses
Bluetooth 2.4 Personal Area Network Gigabit Ethernet, PCI Express Bus, LCD Clock Harmonics
IEEE 802.11b/g 2.4 Wireless LAN (Wi-Fi) Gigabit Ethernet, PCI Express Bus, LCD Clock Harmonics
IEEE 802.11n 2.4 High-SpeedWireless LAN Gigabit Ethernet, PCI Express Bus, LCD Clock Harmonics
IEEE 802.16e 2.52.69 3.33.8 5.7255.85 Mobile Broadband(Wi-Max) PCI Express Bus, LCD Clock Harmonics
IEEE 802.11a 5.2 Wireless LAN (Wi-Fi) PCI Express Bus, LCD Clock Harmonics

• Problem Statement
• Interference from clocks and busses is
  near-field, non-Gaussian and impulsive
• Potential Impact
• Improved bit rates and extended range of
  receivers embedded in laptops, PDAs, etc.

• Approaches Used
• Noise Modelling
• Middleton Class A, B and C models
• Alpha Stable Models
• Parameter Estimation
• Expectation Maximization for Class A
• Extreme Order Statistics for Alpha Stable
• Filtering and Detection
• Optimum Bayesian Detectors
• Myriad Filtering
• Particle Filtering (future work)

Communication Performance (Class A)
Communication Performance (Alpha Stable)
RFI Mitigation Simulation Toolbox available at
http//www.ece.utexas.edu/bevans/projects/rfi/sof
tware/