lecture26

lecture26 - EEE455/591 EEE455/591 2.5G and 3G C llular S m...

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EEE455/591 EEE455/591 2.5G and 3G Cellular Systems 2.5G and 3G Cellular Systems Reading: Focus on this PowerPoint Reading: Focus on this PowerPoint Read pp 770-774 again Read pp 770-774 again Review: IS-95 Forward and Reverse Channels Review: IS-95 Forward and Reverse Channels What Defines 1G, 2G, 2.5G, and 3G? What Defines 1G, 2G, 2.5G, and 3G? 2.5G Networks 2.5G Networks 3G: Networks WCDMA and CDMA-2000 3G: Networks WCDMA and CDMA-2000 Data Networking (GPRS and EVDO) Data Networking (GPRS and EVDO)
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Review: IS-95 Forward Channel (Base to Mobile) For down link, we send multiple signals to different users. The transmission of these signals is synchronized (both bit and chip levels) Users assigned one of 64 Hadamard sequence (length =64) Signals are orthogonal by the use of Hadamard sequence.
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Due to lower power, rate 1/3 code used instead of ½. 6 bits of data mapped into one of 64 Hadamard sequences. Each sequence is 64 chips, mapping 28.8 ksym/s onto 28.8 x64/6 = 307.2 ksym/s. Further spreading by 4 by user specific sequence at 1.2288 Mchips/s (307.2k x
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This note was uploaded on 11/01/2009 for the course EEE 455 taught by Professor Hui during the Spring '09 term at ASU.

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lecture26 - EEE455/591 EEE455/591 2.5G and 3G C llular S m...

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