- published: 26 Mar 2015
- views: 1659
Smart antennas (also known as adaptive array antennas, multiple antennas and, recently, MIMO) are antenna arrays with smart signal processing algorithms used to identify spatial signal signature such as the direction of arrival (DOA) of the signal, and use it to calculate beamforming vectors, to track and locate the antenna beam on the mobile/target. Smart antennas should not be confused with reconfigurable antennas, which have similar capabilities but are single element antennas and not antenna arrays.
Smart antenna techniques are used notably in acoustic signal processing, track and scan radar, radio astronomy and radio telescopes, and mostly in cellular systems like W-CDMA, UMTS, and LTE.
Smart antennas have two main functions: DOA estimation and Beamforming.
The smart antenna system estimates the direction of arrival of the signal, using techniques such as MUSIC (Multiple Signal Classification), estimation of signal parameters via rotational invariance techniques (ESPRIT) algorithms, Matrix Pencil method or one of their derivatives. They involve finding a spatial spectrum of the antenna/sensor array, and calculating the DOA from the peaks of this spectrum. These calculations are computationally intensive.
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With the Smart Antenna Hirschmann Car Communication presents a technology that intelligently combines transceiver, tuner and antenna in one unit. The Smart Antenna perfectly fulfils the requirements of new system infotainment architectures. It links a range of services including radio, GNSS, mobile communication, eCall, TV and Car-to-X at one central point.
the concept of smart antennas (also known as adaptive antennas) is not new. However, until recent years, their cost has prevented their use in commercial systems. Smart antennas are antenna arrays with smart signal processing algorithms used to identify spatial signal signature. Smart antenna techniques are used notably in acoustic signal processing, radar, radio telescopes, and cellular systems.In this videos showed that frequency change and reuse of frequency in the same cell. As both of Mohamed and Koriem using frequency 2 in the same cell but when they start to be close to each other BTS change one frequency of them to be 5 to avoid interference.
Animation of a smart antenna system. The goal is to put nulls in the radiation pattern in the directions of the interferers and maximums in the desired direction Depending on the position of the interferers and the position of the signal of interest we calculate the complex weights applied to each antenna of the array antenna (8 isotropic antennas in our case) We show the value of this eight complex weights, the signal to interference ratio (SIR) and the ratio between the power in the direction of interest and the power in the direction of maximum radiation We suppose that the signal of interest and the interference signals have the same power, so the SIR doesn't change with the transmitted power It is very remarkable that when we have the interferers close to the signal of interest we are...
Smart Antenna Technologies - Applications
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This is the presentation of Smart Antenna focused on the project"Performance Analysis of Smart Antenna Technology",