OFDM, modulation, SNR, BER, fading
Wireless Systems Engineer Interview Questions
66 wireless systems engineer interview questions shared by candidates
lower layer wireless questions
1. Compare bit rate among BPSK, QPSK, and QAM
First of all, he asked about the project you have done. Then he asked me two problems related to probability and static. One is to calculate the pdf of the random variable which is function of a set of iid random variables, the other is to derive the MAP for given random variable with specific distribution.
1) Tell us about your project 2) What are the challenges of MAC in the project? How did you overcome it? 3) Do you make the channel yourself or call someone else's code in your simulation?
Questions about FFT, DFT, modulation, QAM, BER.
Describe the difference between coaxial line and microstrip line
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.
Questions about matrices, covariance, FFTs.
Questions about DSP, Linear Algebra and modulation concepts.
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