For OFDM multicarrier system carries data. The system uses 16 QAM with input data rate of 56 KBps (into the 16QAM). For the reciever to perform the FFT, a symbol timing synchonization is needed to detect the starting point of each OFDM symbol. What is the OFDM symbol time? What are the main difficulties of the given OFDM system, consider 64QAM instead of 16QAM.