Qualcomm interview questions

I first had a telephonic interview with engineering staff/manager, it went for about 45 minutes. He asked my recent job experience, wireless protocol related questions, my graduate projects and all. After 1 week on telephonic interview I got an onsite call, there were 8 people for interview panel, each for 40-45 min in person, 4 of them were Engineering manager, 3 of them were senior/staff engineers and 1 HR. In interviews they asked me bunch of wireless protocol related questions, projects, net working concepts, digital communication concepts etc. After around 3 weeks of my onsite Interview, I got an offer from QC.

I applied to Embedded S/W position in QCT via Online. After applying the position, I got a contact e-mail from HR to arrange Phone Interview. I had a Phone Interview with a senior-level engineer and was invited to their site after 3 weeks. Then, I had several 1:1 interviews including HR. After 1 week, I got reject e-mail.