Qualcomm Engineer interview questions

Telephone interview for 30 mins and then onsite interview of about 5 rounds Questions: srns relocation procedure what are the ranges of uplink and downlink frequencies in gsm? which is higher and which is lower? reasons why higher? why Qpsk is used in cdma? why gmsk is used in gsm? waveform of gmsk? properties of gmsk? how to generate gmsk dpcm and delta modulation differences Authentication procedures between Ms sgsn and hlr ofdm basics - why ofdm? interleaving? disadvantages and advantages of ofdm. PAPR reduction techniques sampling theorem related questions - nyquist rate result of convolution of two sine waves of different frequencies quantization related questions Rayleigh and ricean fading differences Maximum number of pdp contexts per subscriber Integration and cyphering keys usage Explain Paging of MS functions of rnc fields in ms network capability part in gmm attach message messages involved in basic attach procedure reversing a singly linked list using one temporary variable without recursion easy way to multiply a number by 7 given x, program to count number of set bits in all number upto x count number of set bits in a number write a program for binary search tree write a program to sort numbers using selection sort questions related to malloc and calloc how to delete a particular node in a singly linked list if the address of the node to be deleted is the only thing we know what is memory leak what is dangling pointer difference between enum and costant data type of enum static and global variables related questions difference between local static and global static variables what is deadlock? causes? ways to avoid page replacement in memory mutex semaphore concepts process control block related questions scheduling a process scheduling algorithms what is message passing and how to synchonize concurrently running processes cache memory/virtual memory related questions how to cut a random piece of cake into two equal halves building with n floor. find the floor of least height where a pane of glass breaks when dropped, in minimum number of attempts derive the formula to find volume of a pyramid,cylinder what is probability? sample size? probability related mathematical question circuits related - draw and gate,or gate, xor gate 2s compliment of a number bcd addition related

Hiring process was quite good and communication was very effective with no delays. There was telephonic round for a half an hour. F2F was for almost all day which includes 5 to 6 rounds followed by the HR round. This was again followed by another telephonic round after which the offer was made