Brian K. Butler
Qualcomm
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Publication
Featured researches published by Brian K. Butler.
vehicular technology conference | 1994
Roberto Padovani; Brian K. Butler; Robert Wright Boesel
This paper presents results from field tests of the CDMA system developed by Qualcomm, Incorporated. The CDMA system, now EIA/TIA digital standard IS-95, has undergone extensive field tests since its early inception. The latest series of technical tests was conducted in San Diego, California by Qualcomm in cooperation with several cellular carriers and equipment manufacturers during the month of August 1993. The goals of the tests were to provide an accurate measure of the capacity of the system, to validate the standard with compliant equipment, and finally to aid service providers in understanding the tradeoff of system parameters as large CDMA cellular networks begin to be deployed.<<ETX>>
IEEE Transactions on Vehicular Technology | 2001
Sandip Sarkar; Brian K. Butler; Edward G. Tiedemann
cdma2000 is one of the proposals currently being reviewed for the 3G systems. This paper addresses one of the areas of improvement of cdma2000 over the IS-95based systems-the standby time of the phone. This paper proposes a novel scheme for the paging channel by splitting it into three parts. It analyzes the design of the quick paging channel (QPCH) and characterizes its performance for various conditions. This paper also looks at a way to put this common channel in soft handoff, thereby improving the reliability and leading to a better standby time for the cdma2000 phones. Both the physical layer and network implications are analyzed in detail.
military communications conference | 2006
Brian K. Butler
The bit error rate performance of superorthogonal convolutional codes is examined for the AWGN channel with an emphasis on graphical error rate curves. The little-noticed generalization of the class of superorthogonal codes that allows for more parameter combinations is examined and found to have error rate performance than is primarily a function of constraint length and not code rate. Symbol puncturing of the codes is also briefly examined
radio frequency integrated circuits symposium | 2002
Brian K. Butler; King-Chung Lai; Keith Saints; B. W. Meagher
The MSM5100 ASIC forms the heart of a high-featured cdma2000 3G handset that is gpsOne position location capable. The gpsOne technology meets the accuracy requirements set by the FCC for E911 Phase II. This ASIC performs baseband processing for the spectrum of air interfaces supported: IS-2000 Release 0, IS-95A/B, AMPS, GPS, and Bluetooth 1.1. The ASIC itself is both a merging effort of two previous ASIC designs, MSM3300 and MSM5000, and the addition of new functionality. The new functionality includes USB speed enhancements and increased IS-2000 physical layer support. Also, several new VLSI challenges were met in creating this product, including our product in the 0.18 um process and integrated voltage regulators. Altogether, the MSM5100 makes a significant leap forward in 3G handset functionality.
Archive | 1993
Roberto Padovani; Edward G. Tiedemann; Lindsay A. Weaver; Brian K. Butler
Archive | 1994
Daniel Ray Kindred; Brian K. Butler; Ephraim Zehavi; Jack K. Wolf
Archive | 2001
Alessandro Vanelli Coralli; Henry D. Pfister; Jilei Hou; John Edward Smee; Roberto Padovani; Brian K. Butler; Jeffrey A. Levin; Thomas B. Wilborn; Paul E. Bender
Archive | 2002
Tao Chen; Jun Wang; Ragulan Sinnarajah; Brian K. Butler; Edward G. Tiedemann
Archive | 1994
Brian K. Butler; Roberto Padovani; Ephraim Zehavi
Archive | 2008
Peter H. Rauber; Matthew S. Grob; Baaziz Achour; Brian K. Butler; Peter Carson; Sanjay K. Jha