Wireless systems engineer Interview Questions
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Wireless Systems Engineer interview questions shared by candidates
You have access to two ports on the RF circuit of a mobile device, one port is at the antenna one at a 50 ohm resistor. Which port will you connect to test the circuit. why describe the advantage and disadvantage of each case.
2 Answers↳
We connect the testing circuit to the antenna. Resistor is the load
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We connect the testing circuit to the antenna. Resistor is the load
Several questions on statistics, signal processing, communications. Mostly fundamental knowledge, not specific to any standard. Example... need to build a Gaussian random number generator, but the chip only supports uniform distribution. How do I solve this?
2 AnswersWhen you get higher throughput: while going at 5mph and while going at 50 mph? And Why?
2 Answers↳
high mobility communication is more difficult.
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You will get higher a throughput while going at 5mph. Higher speeds indicates that the RF channel conditions such as delay and Doppler spread are changing at fast rate and its a fast fading channel. It is difficult to achieve equalization in such situation. Hence the modulation scheme can be shot down to, say QPSK(2 bits/symbol) from maybe 16QAM(4 bits/symbol) to provide a more robust transmission. This brings down the user throughput. Less
onisite : 1st round Basic python scripting. 2 coding question,, Test case, SQL,(RDBMS), UI testing (Which idint know selenium). 2nd round: All basic network protocols, and some senario based questions. interviewer was good.
1 Answers↳
coding was not up to mark, Networking part was good
Tell me about your projects.
1 Answers↳
Told them about current projects I am working on and my past projects.
Where do you want to be in 5 years.
1 Answers↳
Sitting on your side of the desk or taking on a director role.
Most of the questions and cross-questions were asked from the resume. drawbacks of OFDM, etc.
1 Answers↳
I answered them all.
What is the purpose of pulse shaping?
1 Answers↳
maximize spectral efficiency, while maintaining minimal ISI