Spatial Multiplexing (SM)
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Spatial Multiplexing (SM)
Transmit and receive diversity techniques:
- Sending multiple independent streams of unique data using spatial diversity is often also referred to as spatial multiplexing (SM) or spatial diversity multiplexing (SDM).
- Transmitting multiple streams of data with a method called spatial multiplexing (SM) provides for greater throughput and takes advantage of multipath.
- MIMO systems can also use multiple antennas to provide for better transmit and receive diversity, which can increase range and reliability.
Transmit and receive diversity techniques:
- Space-time block coding (STBC)
- Cyclic shift diversity (CSD)
- A MIMO radio also has the ability to send independent unique data streams. Each independent data stream is known as a spatial stream, and each unique stream can contain data that is different from the other streams transmitted by one or more of the other radio chains.
- Each stream will also travel a different path, because there is at least a half-wavelength of space between the multiple transmitting antennas.
- The fact that the multiple streams follow different paths to the receiver because of the space between the transmitting antennas is known as spatial diversity.
Reference:
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.
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