Qualcomm Software Engineer interview questions

First Round (Telephonic) : Basics of LTE and LTE TDD , RTOS concepts , a question on C programming, Q format conversions. In person Round 1 : RTOS concepts, LTE L1 system architecture, embedded C questions mainly on bit operations,priority inversion, WDT,Paging concepts,Reentrant functions,Hard and Soft real time systems and wireless domain specific questions. The c questions were: 1. To set 'N' bits in a number efficiently , N is a variable. 2. Find the number of SET bits (1s) in a given number. 3. Q format conversion. 4. Bit field structures. 5. How to find whether a DSP is Little endian or big endian? In person Round 2 : Fempto cell systems since I worked on it. In person Round 3: Wireless communication basics and LTE basics , mainly from 3GPP specifications. HR Round : Was a formality and I was told feedback would be given after a week .