兹腥湁敤获獯愠獤-MultiuserDetectionforCDMA.pptVIP

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兹腥湁敤获獯愠獤-MultiuserDetectionforCDMA.ppt

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兹腥湁敤获獯愠獤-MultiuserDetectionforCDMA

Multiuser Detection for CDMA Anders H?st-Madsen (with contributions from Yu Jaechon, Ph.D student) TRLabs University of Calgary Overview Introduction Communications Signal Processing CDMA 3G CDMA Multiuser Detection (MUD) Basics Blind MUD Group-blind MUD Performance Some Impression ofa Changing Korea Compared with 2 years ago A lot has changed, fast Internet 90% of subway ads about internet All ads have internet address Cell phones Everyman’s Fashion item Small! The Demands “The future of the internet is wireless,” Steve Balmer, CEO Microsoft Now Internet through telephone Wireless voice phones Emerging High-speed internet (ADSL, cable, satellite, fixed wireless) Some wireless terminals (Nokia 9000, Palm VII, RIM Blackberry) Web on wireless phones Future Wireless everything Internet terminals LAN, home networks Devices (Bluetooth) Wireless video phones? More webphones than wired internet connections in 2004 (Ericsson, Nokia, Motorola) All wireless phones web enabled from 2001 (Nokia) The Constraints Limited spectrum Limited power Complex channels Multipath, shading Interference: Other users, other electronics Solutions Efficient compression Coding Channel signal processing Efficient, cost-controlled media access Software radio New standards for mobile communications 3rd generation systems W-CDMA cdma2000 4th generation by year 2010 The Communication Channel Channel Dispersion (Low pass) filter effect (wireline filters, frequency selective fading) Intersymbol Interference (ISI) Non-linear distortions (power amplifiers) The Wireless Channel DS/CDMA? Principle Users share frequency and time Distinguished by unique code Separated by correlation with code Applications US IS-95 standard Korean cellular system IMT-2000 (wide band (WB) CDMA) Part of future European Frames standards 3G CDMA cdma2000 North America, Korea? Compatible with IS-95 Promoted by Qualcomm Long codes, synchronous Wideband CDMA (WCDMA) Europe, Japan Compatible with GSM Promoted by Nokia, Ericsson