New UPA scheme for turbo codes in cdma2000 system

Abstract

Turbo codes are part of the standardization for the 3G wireless communication system. They have been chosen for their error correcting ability to approach the Shannon limit. In a standard turbo coding system, all bits are transmitted with equal energy. This strategy does not guarantee optimum allocation. UPA ( unequal power allocation) been adopted to optimize the power allocation for each bit stream. Using new modified technique for UPA, the performance of turbo codes is studied.