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Every transmitter is equipped with multiple antennas, so is the receiver.
All nodes are assumed to be equipped with multiple antennas so as to afford simultaneous transmission of multiple data streams.
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Spatial multiplexing is a MIMO transmission technique that transmits multiple independent data streams concurrently from multiple antenna elements so that each antenna element can be logically treated as a separate channel.
Whereas, spatial diversity is a MIMO transmission technique that transmits the same data stream from multiple antenna elements so that they could be processed for correctly decoding the desired information.
Emerging standards for fourth generation cellular systems include both multihop relaying and multiple antenna techniques, so it is necessary to study how these two work jointly in a realistic cellular system.
The combination of multiple antenna techniques (so-called MIMO) with multicarrier transmission schemes such as orthogonal frequency division multiplexing (OFDM), the so-called MIMO-OFDM architecture, is now at the heart of most state-of-the-art wireless systems and future standards [1 3].
These products don't use the multiple antennas that make 802.11n so fast and far-reaching.
Furthermore, more and more techniques rely on adaptive and/or multiple antenna signal processing, so that the dynamic and spatial behaviors of the propagation channel should be covered as well.
As many as two dozen other companies have appeared with alternative approaches to Vivato's, many of them involving so-called mesh networks that use multiple antennas to pass data around like a bucket brigade.
This technology uses computer processors to take the signals from multiple antennas at each location and sorts the various signals out so they don't interfere with each other.
The researchers claim their equipment can work with up to five people in the vicinity of the router so long as it it is fitted with multiple antennas.
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