WiMAX: SOFDMA Basic Quiz. Did you learn something?

1. Which parameter is kept constant in SOFDMA?

Channel bandwidth
Sub-carrier frequency spacing
Number of sub-carriers
FFT size

2. Benefits of using SOFDMA in Mobile WiMAX:
(Select all that apply.)

Complying with various frequency regulations
Reducing guardband
Supporting different operators' requirements
Introducing channel bandwidth scalability

3. Mobile WiMAX supports channel bandwidths from MHz to MHz.

4. In WiMAX Tx/Rx chain, FFT (Fast Fourier Transform) is used in _________ process.

modulation
demodulation
filtering
digital to analog conversion

5. Referring to the following picture of WiMAX OFDM symbol structure, which part represents data sub-carriers?
OFDM Symbol Structure - subcarriers

A B C D

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