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antenna diversity

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antenna diversity
Using two or more receiving antennas on a wireless device to eliminate multipath signal distortion. Typically, the signal from the antenna with the least noise (best SNR) is chosen, and the other antenna is ignored. However, there are also methods that use incoming signals from both antennas. It is quite common to see two antennas on 802.11 wireless LAN access points and PC cards. See MIMO, beamforming, signal-to-noise ratio and multipath.

Antenna Diversity for 802.11
Note the dual antennas on the 802.11b access point (top left) and PC card (bottom) from Alvarion. Antenna diversity is an important feature of the 802.11 specification. (Image courtesy of Alvarion Ltd., www.alvarion.com)
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The receive antenna diversity significantly improves the system performance as expected.
Performance of block space-time code in wireless channel dynamics by Jang, Won Mee; Jung, Jong Hak / International Journal of Communications, Network and Systems Sciences (IJCNS)
When used with Motorola's dual antenna Diversity Access Point (DAP) /Wireless Access Point (WAP) 400 Series, both uplink and downlink performance are significantly enhanced.
MOTOROLA DEBUTS FIRST WIMAX USB ADAPTOR FOR LAPTOPS by Modem User News
69GHz Bandwidth: 5MHz, 10MHz Wireless Access Method: 512/1024 FFT OFDMA Modulation method: 64QAM(**1), 16QAM, QPSK(**2) Antenna: 2x2 STC/MIMO (supports MatrixA & MatrixB) Antenna Impedance: 50 Ohm Diversity: Antenna Diversity Transmission Standard: IEEE 802.
Fujitsu Launches World's Smallest RF Module for Mobile WiMAX Devices; ... by JCN Newswires
 
 
 
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