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.