RESOURCE ALLOCATION IN CDMA WIRELESS COMMUNICATION SYSTEMS

摘要

PROBLEM TO BE SOLVED: To make the dynamic assignment of the spreading codes of a user in a CDMA system carried out based on the multipath channel conditions of that user. SOLUTION: The spread codes are assigned such that multipath signal energies are coherently integrated at the antenna of the receiver to ensure that the multipath components are summed constructively and that a signal gain is obtained. The method is applicable to any CDMA system which uses spreading codes over a multipath channel. A specific algorithm is provided for selecting the codes based on channel parameters and auto-correlation functions of the spreading codes.