DS-CDMA Descrambling and Despreading with the Cell Broadband Engine

This paper presents an investigation of the challengesin efficient programming of a DS-CDMA descrambling anddespreading application for the Cell Broadband Engine(CBE) architecture. A signal model of the DS-CDMA de-scrambling and despreading operations, exploitable by theCBE, is proposed. Based on the signal model partition-ing and extraction of parallelism is conducted and imple-mented. The tests show that the initial implementation isable to demodulate a 10 ms communication burst in 84.2ms with a utilization of 10.3% of the theoretical maximal76.8 GFLOPS. We identify that the rather low utilization isdue to the initial problem partitioning and propose a moreefficient partitionning solution.