Tsunami
®
800 and 8000 Series - Hardware Installation Guide 13
1.2 Multiple-Input-Multiple-Output (MIMO)
Proxim’s Point-to-point and Point-to-multipoint devices support Multiple-Input-Multiple-Output (MIMO) antenna technology
that uses multiple antennas at both the transmitter and receiver to improve communication performance. The underlying
technology of Proxim’s product radios are based on a combination of MIMO and OFDM (Orthogonal Frequency Division
Multiplexing). MIMO-OFDM combination radios solve interference, fading and multi-path problems. On the receiver side,
having multiple receivers increases the amount of received power and also reduces multi-path problems by combining the
received signals for each frequency component separately. Hence, MIMO significantly improves the overall gain.
MIMO also uses Spatial multiplexing transmission technique to transmit independent and separately encoded data signals
from each of the multiple transmit antennas while reusing or multiplexing in the space dimension. These independent data
signals are called Spatial streams. The transmitting antenna uses multiple radio Tx chains and signal paths to simultaneously
transmit different data streams, whereas the receiver combines the Rx signals resulting in higher throughput.
By increasing the number of receiving and transmitting antennas, the throughput of the channel increases linearly resulting in
high spectral efficiency.
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