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Questions were related to Wireless communications and Programming. Wireless Communications--- Shannon's rule, SNR, Bandwidth, Throughput, Difference between GSM, CDMA and LTE, Convolution concepts, call flow in LTE, L1-L2 layers, Modulation schemes. Programming--- C++, Python, bit manipulation, linked list, multiple inheritance, find out missing number in incoming random integers, test case plan, big picture for test cases etc.
avatar

Systems Test Engineer

Interviewed at Qualcomm

3.8★
Jun 26, 2016

Questions were related to Wireless communications and Programming. Wireless Communications--- Shannon's rule, SNR, Bandwidth, Throughput, Difference between GSM, CDMA and LTE, Convolution concepts, call flow in LTE, L1-L2 layers, Modulation schemes. Programming--- C++, Python, bit manipulation, linked list, multiple inheritance, find out missing number in incoming random integers, test case plan, big picture for test cases etc.

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.
avatar

Modem Systems Test Engineer

Interviewed at Qualcomm

3.8★
Oct 25, 2012

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.

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