1) Types of equalizers. Problems with zero-forcing equalizer. Why is MMSE equalizer better than the former? 2) Asked me about a wireless channel measurement project that I had done. Based on that, tested me on the concepts of coherence time, inter symbol interference, multipath fading. 3) Asked about basic concepts in OFDM. What problem does it solve? Can we keep increasing the number of subcarriers? Will there be any issues if we do that? 4) How many numbers can you represent by a unsigned and signed n-bit binary number.
