How exactly are diversity combining and multiplexing different?
My current understanding is that, in certain types of diversity combining such as maximal ratio combining, the same message is sent over different frequencies and then all the messages are collected and based on information of the SNR they are weighted and used as additional info to decode the message.
This seems to be the same concept involved in multiplexing. I am not quite understanding what is happening differently in multiplexing. Can someone please clarify?