PPT-Understanding and Mitigating the Impact of RF Interference

Ramakrishna Gummadi ucs David Wetherall Intel Research Ben Greenstein University of Washington Srinivasan Seshan cmu Presented by Andrew Keating Murad Kaplan 1 outline Introduction. 2. Introduction to . Problem Structure. Three Types of Claims. and Inferences. Normative claims: . Claims about how the world SHOULD be. Descriptive claims / inferences: . Claims about how the world IS. Shyamnath. . Gollakota. Fadel. . Adib. Dina . Katabi. Srinivasan. . Seshan. . ISM Band Is Increasingly Crowded. Most problems are from . cross-technology high-power interferers. Responsible for more than 50% . David . Tse. Wireless Foundations . Dept. of EECS . U.C. Berkeley. CWIT . May 20. , . 2011. TexPoint fonts used in EMF. . Read the TexPoint manual before you delete this box.: . A. A. A. A. A. A. A. A. Wave Optics. The wave nature of light is needed to explain various phenomena. Interference. Diffraction. The . particle nature of light was the basis for ray (geometric) . optics. Light waves interfere with each other much like mechanical waves do. Shyamnath. . Gollakota. Fadel. . Adib. Dina . Katabi. Srinivasan. . Seshan. . ISM Band Is Increasingly Crowded. Most problems are from . cross-technology high-power interferers. Responsible for more than 50% . Swarun Kumar. Fadel. . Adib. , . Omid. Aryan, . Shyamnath. . Gollakota. . and Dina Katabi . Major Advances in MIMO. E.g. Interference Alignment. . Significant gains in throughput. Single-Antenna Devices. and the. Doppler Effect. Lecture 9. Pre-reading. : . §16.6–16.7. Wave Interference. Two or more traveling waves passing through same space at same time (identical frequencies). Use principle of superposition. Shyamnath. . Gollakota. Fadel. . Adib. Dina . Katabi. Srinivasan. . Seshan. . ISM Band Is Increasingly Crowded. Most problems are from . cross-technology high-power interferers. Responsible for more than 50% . Copyright © 2014 John Wiley & Sons, Inc. All rights reserved.. 35-1. Light as a Wave. 35.01 . Using a sketch, explain Huygens’ principle. . 35.02 . With a few simple sketches, explain refraction in terms of the gradual change in the speed of a wavefront as it passes through an interface at an angle to the normal. . Dr. Quantum. 27.1 . The Principle of Linear Superposition. When two or more light waves pass through a given point, their electric. fields combine according to the principle of superposition.. The waves emitted by the sources start out in phase and arrive at . © 2015 Pearson Education, Inc.. Interference Along a Line. If . d. 1. and . d. 2. are the distances from the loudspeakers to the observer, their difference is called the . path-length difference.. TD-LTE . & . WLAN around 2.4GHz Band. Date:. 2014-09-15. Slide . 1. Authors:. Name. Affiliation. Address. Email. Meng. Yang. CATR. yangmeng1@catr.cn. Bo Sun. ZTE. sun.bo1@zte.com.cn. Dapeng Liu. Physics . 2212. Light. Light has Wave properties. Light can Diffract. Light can Interfere. Constructively. Destructively. Wave Fronts. Lines that are perpendicular to the motion of the wave, indicate the location of the crests in the waves that are traveling together.. TD-LTE . & . WLAN around 2.4GHz Band. Date:. 2014-09-15. Slide . 1. Authors:. Name. Affiliation. Address. Email. Meng. Yang. CATR. yangmeng1@catr.cn. Bo Sun. ZTE. sun.bo1@zte.com.cn. Dapeng Liu.