Applications to (B)3G and 4G Systems ─ Introduction © J. Ylitalo & M. Juntti‚ University of Oulu‚ Dept. Electrical and Inform. Eng.‚ Centre for Wireless Communications (CWC) 1 Introduction • Short historical note • Advantages of multi-antenna techniques • Adaptive antennas – - Beamforming: spatial focusing of correlated signals – - Rx/Tx diversity: combining of decorrelated signals – - MIMO: increasing spectral efficiency/ data rates • Simple example: SINR improvement • Definition of MIMO • Spatial
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1. What command can you enter in the Search box to launch Device Manager? Devmgmt.msc 2. Which is faster‚ an eSATA-600 port or a FireWire 800 port? eSATA-600r 3. What is the speed for Hi-Speed USB? 480 Mbps 4. How many times faster is a Hi-Speed USB port than an Original USB port running at 12 Mbps? 468Mbps 5. Which is faster‚ USB 3.0 or eSATA 600? eSATA 600 6. Which is faster‚ Wi-Fi 802.11n or Bluetooth? Wi-Fi 802.111n 7. How many pins does a FireWire 800 port have? 9-pin 8.
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types of antennas. There are mainly two types of antennas: omnidirectional‚ and directional. Omnidirectional antennas are installed on most WLANS with AP’s that have them. Omnidirectional antennas do just what they sound like‚ which is transmit data in all directions at the same time. The signal can go horizontally and vertically; and up and down. However‚ there can be a dead spot in a minute area directly above the antenna which has no signal. One common example of this type of antenna is the dipole
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types of antennas. - omnidirectional antennas: the antenna transmits in all directions simultaneously. One common omnidirectional antenna is the dipole antenna (nicknamed the “rubber duck” because of its flexibility); omnidirectional antennas transmit in all directions‚ both horizontally and vertically. The signal goes in all directions‚ as well as up and down‚ although there is often a small dead spot with no signal that is a very small area directly above the antenna. - directional antenna: As the
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Engineering‚ Pune Email id-shaurya.cherry@gmail.com [A]ABSTRACT The Conventional method of Wireless Transmission uses a Single Antenna each at the source and at the Destination giving rise to problems of Multipath Propagation. Multipath is the propagation phenomenon where transmitted information collides with ceilings‚ walls and other objects‚ which reaches the receiving antenna multiple times via different angles and at slightly different times causing a reduction in data speed and an increase in the
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wireless communication using omnidirectional antennas communication is made in directions not pointing towards the recipient resulting in energy waste‚ and producing traffic collisions and reducing the battery life. One way of reducing this problem is to use of smart antenna that uses selectable radiation patterns depending on the situations. These antennas provide the ability to sense the direction of incoming signals. Smart antennas are the antenna arrays with smart signal processing algorithms
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DIRECTIONAL PATCH ANTENNA ARRAY DESIGN FOR DESKTOP WIRELESS INTERNET by Noah Snyder Senior Project ELECTRICAL ENGINEERING DEPARTMENT California Polytechnic State University San Luis Obispo 2010 2 Table of Contents List of Figures ................................................................................................................................................ 3 List of Tables .............................................................................................
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two or more receiving antennas. While Equalization is used to counter the effects of ISI‚ Diversity is usually employed to reduce the depth and duration of the fades experienced by a receiver in a flat fading channel. These techniques can be employed at both base station and mobile receivers. Spatial Diversity is the most widely used diversity technique. In this technique multiple antennas are strategically spaced and connected to common receiving system. While one antenna sees a signal null‚
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imaginable results on your network. 2. Setting a MAC filter is a good way to filter who has access to your network. 6.4 6.4.1 An omnidirectional antenna radiates transmissions out and receives transmissions in from all directions‚ although not equally in all directions. Most of the antennas in this category are thin rods or long flat sticks. A directional antenna is one that has a wide dispersion of more than 80 degrees and less than 120 degrees. A highly
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example) occurs; most often associated with urban places. 2 [edit]Communications Diversity scheme‚ a method for improving reliability of a message signal by using multiple communications channels Antenna diversity or space diversity‚ a method of wireless communication that use two or more antennas to improve reliability Transmit diversity‚ wireless
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