11. What is rake receiver in CDMA? 13. Assuming a shift register of 15 for short code and 64 bit per chip, what would be the maximum number of PN codes to identify access points in CDMA systems? 15. What are approximate power allocation of AP to different channels such as pilot, paging and traffic channels? Solution It is a radio receiver designed to counter the results of multipath fading. It does this by several sub-receivers named fingers, that is, several correlates each assigned to a dissimilar multipath component..