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Smart antennas (also known as adaptive array antennas, digital antenna arrays, multiple antennas and, recently, MIMO) are antenna arrays with smart signal processing algorithms used to identify spatial signal signatures such as the direction of arrival (DOA) of the signal, and use them to calculate beamforming vectors which are used to track and locate the antenna beam on the mobile/target.
CEA-909 is the ANSI standard for 8VSB/ATSC smart antennas.The basic concept is that the smart antenna either physically rotates toward the signal, or is stationary, but has elements pointed in different directions and uses only those elements that maximize the received signal.
A rooftop 1 watt Wi-Fi amp, feeding a simple vertical antenna on the left. Another way of adding range uses a power amplifier. Commonly known as "range extender amplifiers" these small devices usually supply around 1 ⁄ 2 watt of power to the antenna. Such amplifiers may give more than five times the range to an existing network.
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Digital antenna array (receiver segment) Digital antenna array (transmitter part) Digital antenna array (DAA) is a smart antenna with multi channels digital beamforming, usually by using fast Fourier transform (FFT). The development and practical realization of digital antenna arrays theory started in 1962 under the guidance of Vladimir Varyukhin .
MIMO is an advanced smart antenna system which has multiple transmit antennas at the transmitter and multiple receive antennas at the receiver. An array of transmitters and receivers used to illustrate the multiple signal paths from a transmitter to a receiver.
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