An Overview of High-speed Packet Data Transport in CDMA Systems

Abstract

Rapid growth of data services in wireless communication systems requires an efficient means for high speed data transport. Modern CDMA systems have evolved to support this need. This paper presents an overview of the key techniques for improving high speed data transport in the following standards: 1xEV-DO (IS-856 Rev A), 1xEV-DV (cdma2000 Rev D), and HSDPA & EUL (WCDMA FDD Release 6). The emphasis is on identifying the common themes for high speed data transport in all these systems: adaptive modulation and coding, incremental redundancy and hybrid ARQ, smart scheduling to exploit channel variations, limited downlink macro-diversity aided by fast sector switching, and the use of shared channels to improve perceived latency.

Additional information

Notes on contributors

Parvathanathan Subrahmanya

P Subrahmanya received his BTech degree in Electronics and Communication Engineering from IIT Madras in 1991 and his MS and PhD degrees in Electrical Engineering from Cornell University in 1994 and 1997 respectively. He is currently with Qualcomm Inc., where he leads the system design effort on one of Qualcomm's ASICs implementing HSDPA. His interests include terrestrial and satellite wireless communication systems, VLSI signal processing for communications, and cross-layer system design.

Rajesh Sundaresan

Rajesh Sundaresan received the B. Tech, degree in electronics and communication engineering from Indian Institute of Technology, Madras, in 1994, the MA degree in electrical engineering from Princeton University, Princeton, New Jersey, in 1996, and then PhD degree, also from Princeton University, in 1999. Since 1999, he has been with the CDMA technologies division of Qualcomm Inc., Campbell, California. His current interests include wireless communication systems and networks, signal processing, information theory, and statistics.

Da-Shan Shiu

Da-shan Shiu received the BSEE degree from National Taiwan University, Taipei, Taiwan, ROC in 1993, and the PhD degree in Electrical Engineering and Computer Sciences from the University of California at Berkeley in 1999. From 1999 to 2004, he was with Qualcomm Incorporated, where he was involved in the development of signal processing algorithms for WCDMA/HSDPA products. In August 2004, he joined the Graduate Institute of Communication Engineering of National Taiwan University as an Assistant Professor. His current research interests include MIMO space-time wireless communication techniques, next generation LAN, cellular, and wireless broadcast systems, wireless multimedia applications, information theory, and wireless optical communications.