Qualcomm Modems Systems Test Engineer interview questions

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

First, I had a phone screen which lasted for an hour. It was basically on the wireless communication concepts like LTE, OFDM, channel access methods, Error correction and detection, fading concepts and digital communication concepts. Then I was called for an onsite interview which had 7 rounds including HR.