How the frequency hopping block works in MB OFDM UWB?

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cambyzhu

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Currently I am trying to simulate a very basic MB OFDM UWB system which base on the Matlab center "Fix point UWB OFDM system". But I do not understand how the system change it's fc to each sub-band. Can anybody tell me why and how the frquency hopping block works and explain what are the basic block I can left if I just want to simplify the system?
The system is on this website
**broken link removed**
 

MB OFDM UWB

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