WiMAX Question: Download WiMAX PDF
What is the difference between OFDM and OFDMA in WiMAX?
Answer:
OFDM and OFDMA differ in the way resources are allocated to the subscribers. Also in OFDM FFT size is fixed to 256 subcarriers. In OFDMA FFT size is variable and it can take any value from 128, 512, 1024 and 2048. Frame structure is also different. There is also difference in the physical layer modules.