I was trying to understand what exactly happens when you try to modulate an ofdm symbol in the downlink in LTE for multi-user case.
When we modulate, usually we allocate different sets of RBs for different users. Since an RB is 12 subcarriers in frequency, a given ofdm symbol (say 2048 SCs in a 20 MHz case) can contain data from different users. And we do take IFFT of this 2048 sized data vector comprising of different user data. Is that right?. OR do we append 2048-12 zeros to a specific user data and then take IFFT?
Thanks in advance.