WCDMA Introduction Code Division Multiple Access

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Presentation transcript:

WCDMA Introduction Code Division Multiple Access Chia-Chi Yu 2004.7.23

Outline History Multiple Access Technique Why CDMA? Spread Spectrum How CDMA work? (simulation) Problems in a CDMA system (simulation)

History 1949 C. Shannon develop basic ideas of CDMA 1991 First GSM network 1991 Development of IMT2000 and UMTS standards 1995 Commercial operation of CDMA system (IS-95) in Hong Kong/Korea 1998 The first meetings of the 3GPP release 4 5 6 7…. 2005 UMTS service will be world wide (?)

Introduction Applications Need Multiple Access! Wireless communication is the way of the future Applications Mobile phones Wireless LAN Global positioning system Need Multiple Access!

Multiple Access Techniques TDMA Time Division Multiple Access FDMA Frequency Division Multiple Access CDMA Code Division Multiple Access SDMA Space Division Multiple Access

Why CDMA ? Frequency limited Bandwidth Efficiency Voice Activity ~40% Variable Spreading Factor

Spread Spectrum FHSS Frequency Hopping Spread Spectrum THSS Trequency Hopping Spread Spectrum DSSS Direct Sequence Spread Spectrum

DSSS Data is spread by multiplying a high rate spreading code Receiver is de-spread by using the same code

Spectrum

Spectrum

Problems in a CDMA Channel Near-Far Problem

CDMA system needs Power Control

Reference http://www.umtsworld.com http://www.3gpp.org K. Riyyol,S-72.238 WCDMA system Qualcomm, Fundamentals of Wireless Communications & CDMA A. J. Viterbi,Ed.,CDMA. Addison-Wesley 1995 S. G. Glisic Ed.,Adipative WCDMA. Wiley 2002