The process took 1 day. I interviewed at Clearwire (Atlanta, GA) in May 2010
Interview
The gave me a quiz with multiple questions about fundamentals of wireless communications, RF engineering. After the quiz, I interviewed with a panel of senior engineers and they asked me questions about my experience, what I hoped to get out of the internship and what I could offer to the team. i received the offer two days after the interview.
Interview questions [1]
Question 1
IQ constellations, smith charts, antenna and EM propagation fundamentals, modulation schemes.