Qualcomm Modem Systems Test Engineer Interview Questions | Glassdoor

Qualcomm Modem Systems Test Engineer Interview Questions

Interviews at Qualcomm

18 Interview Reviews

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Helpful (15)  

Modem Systems Test Engineer Interview

Anonymous Employee in San Diego, CA
Accepted Offer
Positive Experience
Difficult Interview

Application

I applied online. The process took 2+ months. I interviewed at Qualcomm (San Diego, CA).

Interview

I applied for the position in mid August and got the invitation for the phone interview after a month. The phone interview lasted around 45 minutes. It was purely technical, covering all aspects of MIMO and OFDM. Make sure you know what you are taking about because they cover the concepts well in depth and throwing out buzz words might land you in trouble.
The interviewer was very nice and explained about the position after the technical round.
He offered me to come on site straightway. One important tip is to make sure you ask good questions about the position at the end.

On site interview process is very exhaustive and in depth. I had 8 rounds, one HR and 7 technical. All the interviewers were very nice, professional and supportive. The interview process covered all the basics of wireless communications including fading, modulation techniques, interleaving, source coding/channel coding, MIMO equalizers, fundamentals of TCP/IP, digital communications, signal processing and C programming (particularly pointers and linked lists)
In between the interviews, they take you out for lunch. Make you you strike an intelligent conversation during that time and ask relevant questions.
Also make sure you are very thorough with your resume as they can ask about any experience mentioned their.

Interview Questions

  • Take a random sequence of bits and perform source coding using Huffman code.
    Write an optimization function for a 4 way traffic intersection, where vehicles are coming in from all directions. [Hint: Think cars as client in need of service arriving at an arrival rate and traffic light as the server process with a service rate]
    Drive the bit error rate of BPSK.
    Write a regular expression in Perl to search for a string pattern.( this was unexpected since I had told them I did not know perl )
    How would you test a Modem if you get complaints from field about cell phones not working. Describe the test cases.   Answer Question

Other Interview Reviews for Qualcomm

  1. Helpful (2)  

    Modem Systems Test Engineer Interview

    Anonymous Interview Candidate
    No Offer

    Interview

    Phone Interview:

    Asked Questions on : CDMA basics operation, OFDM basic principle, Importance of orthogonaility in OFDM, How is Orthogonality achieved, Cyclic prefix in OFDM,
    MIMO basics, Antenna Diversity concept.

    Most of the phone interviews are usually based on Resume. So be clear with all your projects mentioned.

    Interview Questions


  2.  

    Modem Systems Test Engineer Interview

    Anonymous Employee in San Diego, CA
    Accepted Offer
    Positive Experience
    Difficult Interview

    Application

    I applied online. The process took 2+ weeks. I interviewed at Qualcomm (San Diego, CA) in December 2011.

    Interview

    A phone interview that lasted 45 mins. The interview was on the basics of communication systems/DSP.

    I was then called for an onsite interview that lasted an entire day. Over 6 interviews were held and most questions were centered on fundamentals of Signal Processing/Communication with a minor focus on programming. A lot of questions were on my projects

    Interview Questions

    • I had a project on MIMO OFDM phase noise compensation. The question was how I could have implemented the same for a CDMA based system   Answer Question
  3.  

    Modem Systems Test Engineer Interview

    Anonymous Employee
    Accepted Offer
    Positive Experience
    Average Interview

    Application

    The process took 5 days. I interviewed at Qualcomm in March 2014.

    Interview

    Onsite interview basic programming question and networking questions. It was contract position so they directly called for onsite interview. Onsite interview was with team lead and was for 90 minutes. He basically asked basic C and perl programming questions and TCP header format and other TCP and UDP questions.

    Interview Questions

    • C programming questions and TCP UDP protocols questions.   Answer Question

  4.  

    Modem Systems Test Engineer Interview

    Anonymous Interview Candidate in San Diego, CA
    No Offer
    Negative Experience
    Average Interview

    Application

    I applied online. The process took 1 day. I interviewed at Qualcomm (San Diego, CA) in March 2016.

    Interview

    The interview spanned the whole day. It consisted of one on one interviews with 4 different members of the team. The interviewers had varying fields of technical expertise. Each interview lasted 45 minutes. The interviews were in the engineer's cubicle and often had me working out the problem on a whiteboard.

    Interview Questions

    • Explain the hardware design a polyphase filter and the number of MACs required.   Answer Question

  5. Helpful (1)  

    Modem Systems Test Engineer Interview

    Anonymous Employee in San Diego, CA
    Accepted Offer
    Positive Experience
    Average Interview

    Application

    I applied through a recruiter. The process took 1 day. I interviewed at Qualcomm (San Diego, CA) in December 2015.

    Interview

    Round1 - 30min
    Round2 - 35min
    Need to know all that you have mentioned in resume. Very friendly. 3 people interviewed. Since the time was less, the interviewer expected straightforward answers. Better know the concepts well. Otherwise might have been difficult and uncomfortable.

    Interview Questions

    • All about resume, why SCFDMA in uplink, PHFICH channel frequencies, what happens in MRC, LTE call procedure.   1 Answer

  6. Helpful (6)  

    Modem Systems Test Engineer Interview

    Anonymous Employee
    Accepted Offer
    Positive Experience
    Difficult Interview

    Application

    I applied online. The process took 3 weeks. I interviewed at Qualcomm.

    Interview

    2 phone interviews. One day long on-site interview in San Diego. Everything was organized, not to mentioned everything was paid by Qualcomm. Onsite can be 1:1 or 1:2 or 1:3. or even 1:many

    Interview Questions

    • Basics of Digital Communication, C/C++, RF, Probability, Statistics   Answer Question

  7.  

    Modem Systems Test Engineer Interview

    Anonymous Interview Candidate
    No Offer
    Positive Experience
    Average Interview

    Application

    I applied online. I interviewed at Qualcomm in June 2018.

    Interview

    Professional. clear and response quick than I thought. Firstly, talk about my research experience, discuss the details. Then half an hour for the screening question. I enjoyed talking with him. But got rejected after phone interview.

    Interview Questions

    • How to improve the throughput in a point to point communication( could cover many things. information theory, mcs, mimo, mac layer)   Answer Question
  8.  

    Modem Systems Test Engineer Interview

    Anonymous Employee in San Diego, CA
    Accepted Offer
    Positive Experience
    Difficult Interview

    Application

    I applied in-person. I interviewed at Qualcomm (San Diego, CA) in December 2014.

    Interview

    I was working as a consultant in the same team. I had applied online for the opening (didn't know it would be in the same team), there were five 1:1 interviews with Senior Staff and above.
    I got the feedback in 20 days.

    Interview Questions

    • 1. Basics of 3G (WCDMA/HSPA) technology.
      2. Basics of Digital Communication & Wireless Communication.
      3. Roles and Responsibility in the current position.
      4. What did you learn in the contract role.   Answer Question

  9.  

    Modem Systems Test Engineer Interview

    Anonymous Interview Candidate in Boulder, CO
    No Offer
    Positive Experience
    Average Interview

    Application

    I applied online. I interviewed at Qualcomm (Boulder, CO) in March 2017.

    Interview

    I applied for Modem Systems Test Engineer in Boulder, Colorado. After 2 days I received e-mail to schedule phone interview. Interview lasted60 minutes. Two days after phone interview I received another e-mail to schedule on site visit.

    Interview Questions

    • 1. OFDM
      2. Cycle Prefix
      3. Resume details
      4. Source and channel coding
      5. Ideas for low throughput   Answer Question

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