Reducing dynamic power consumption in next generation DS-CDMA mobile communication receivers
International Journal of Embedded Systems
Reducing dynamic power consumption in next generation DS-CDMA mobile communication receivers by Vikram Chandrasekhar Reduction of the power consumption in portable wireless receivers is an important consideration for next-generation cellular systems specified by standards such as the UMTS, IMT2000. This thesis explores the design-space for reducing the dynamic power dissipation in a RAKE receiver for the Direct Sequence Code Division Multiple Access (DS-CDMA) downlink. Starting with a reference
... ng with a reference implementation of the DS-CDMA RAKE receiver, we demonstrate design methodologies for achieving significant power reduction, while highlighting the corresponding performance trade-offs. At the algorithm level, we investigate the impact of reduced precision and arithmetic complexity on the performance of the DS-CDMA RAKE receiver. We then present architectures for implementing the reference and reduced complexity DS-CDMA RAKE receivers, and analyze these architectures with respect to their dynamic power dissipation. Finally, we analyze clock-gating techniques for reducing the activity rate in both the architectures to achieve further power reduction. Sir Issac Newton Personally, this thesis represents the culmination of a voyage of discovery in the exciting world of wireless communications system design. The work has made me understand and appreciate the amount of constraints and practical difficulties that are part and parcel of a System-on-chip (SoC) design. My work would be incomplete without expressing my appreciation to all the people whose guidance and help made this thesis possible. I'd specially like to thank Frank Livingston for his boundless enthusiasm and willingness for spending those countless hours with me, discussing interesting ideas which formed the core behind my research. My sincere thanks to Dr. Aazhang, Ashu, Krishna Kiran and Sridhar, for answering even the most simple queries and providing me with sound technical advice. No amount of words would sufficiently convey my gratitude to my friends at Rice like Soups, Abha, Arnab, Vaya, Nasir, Aditya whose friendship added so much fun at work.