Radio chains
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Radio chains

Switched Diversity

• A radio chain is defined as a single radio and all of its supporting architecture, including mixers, amplifiers, and analog/ digital converters.
  
• A MIMO system consists of multiple radio chains, with each radio chain having its own antenna.
• A MIMO system is characterized by the number of transmitters and receivers used by the multiple radio chains.
• For example, a 2 × 3 MIMO system would consist of three radio chains with two transmitters and three receivers.
• A 3 × 3 MIMO system would use three radio chains with three transmitters and three receivers.
• In a MIMO system:
  
  • the first number always references the transmitters (TX)
    
  • the second number references the receivers (RX)
    

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Reference:
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.