42935
The protocol is designed to be implemented with smart antenna array techniques ( called MIMO for multiple-input multiple-output ) to substantially improve the radio frequency ( RF ) coverage , capacity and performance for the system .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None