DS-CDMA Descrambling and Despreading with the Cell Broadband Engine

Author

Kristensen, Jes Toft ; Simonsen, Peter August ; Popp, Andreas ; Koch, Peter ; Moullec, Yannick Le

Author_Institution

Dept. of Electron. Syst., Aalborg Univ., Aalborg, Denmark

fYear

2009

fDate

3-5 April 2009

Firstpage

128

Lastpage

133

Abstract

This paper presents an investigation of the challenges in efficient programming of a DS-CDMA descrambling and despreading application for the Cell Broadband Engine(CBE) architecture. A signal model of the DS-CDMA de-scrambling and despreading operations, exploitable by the CBE, is proposed. Based on the signal model partitioning and extraction of parallelism is conducted and implemented. The tests show that the initial implementation is able to demodulate a 10 ms communication burst in 84.2 ms with a utilization of 10.3% of the theoretical maximal 76.8 GFLOPS. We identify that the rather low utilization is due to the initial problem partitioning and propose a more efficient partitioning solution.

Keywords

code division multiple access; demodulation; microprocessor chips; spread spectrum communication; CBE architecture; DS-CDMA descrambling; cell broadband engine; demodulation; despreading application; signal model partitioning; Clocks; Delay; Engines; Frequency; Multiaccess communication; Pipelines; Processor scheduling; Random access memory; Signal processing; Testing; Cell BE; DS-CDMA; Descrambling; Despreading;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Acquisition and Processing, 2009. ICSAP 2009. International Conference on

Conference_Location

Kuala Lumpur

Print_ISBN

978-0-7695-3594-4

Type

conf

DOI

10.1109/ICSAP.2009.21

Filename

5163840