WiMAX Question:
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Explain the functions of modules used in WiMAX OFDM physical layer?
Answer:
The most commonly employed in wimax devices are OFDM (Orthogonal Frequency Division Multiplexing) and OFDMA (Orthogonal Frequency Division Multiple Access). OFDM and OFDMA differ in the way data is mapped onto the resource. In OFDM all the 256 subcarriers are utilized by the subscribers (SSs) and they have been shared based on time interval between SSs. In OFDMA there are different FFT sizes supported. In case of 1024 point FFT, SSs are allocated few of the subcarriers and further shared based on time between them.
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