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Dive into the research topics where Brian K. Butler is active.

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Featured researches published by Brian K. Butler.


vehicular technology conference | 1994

CDMA digital cellular: field test results

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

Phone standby time in cdma2000: the quick paging channel in soft handoff

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

AWGN Performance of Superorthogonal Convolutional Codes

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

The MSM5100/sup TM/ cdma2000 + AMPS + gpsOne/sup TM/ + Bluetooth multimode ASIC for 3G handsets

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

Method and apparatus for the formatting of data for transmission

Roberto Padovani; Edward G. Tiedemann; Lindsay A. Weaver; Brian K. Butler


Archive | 1994

Multirate serial viterbi decoder for code division multiple access system applications

Daniel Ray Kindred; Brian K. Butler; Ephraim Zehavi; Jack K. Wolf


Archive | 2001

Method and apparatus for canceling pilot interference in a wireless communication system

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

Method and system for a handoff in a broadcast communication system

Tao Chen; Jun Wang; Ragulan Sinnarajah; Brian K. Butler; Edward G. Tiedemann


Archive | 1994

Method and apparatus for determining data rate of transmitted variable rate data in a communications receiver

Brian K. Butler; Roberto Padovani; Ephraim Zehavi


Archive | 2008

Access point for improved content delivery system

Peter H. Rauber; Matthew S. Grob; Baaziz Achour; Brian K. Butler; Peter Carson; Sanjay K. Jha

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