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Home > Communications > Telecommunications > General Telecom
CDMA Technologies and Applications
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- 1 Introduction..
- 1.1 Why Wireless?.
- 1.1.1 Types of Transmission Mediums.
- 1.1.2 Advantages of Wireless Communication Systems.
- 1.1.3 Low & High Frequencies.
- 1.1.4 CDMA Modulation Techniques.
- 1.1.5 Effects in Radio Communication.
- 1.1.5.1 Path Loss.
- 1.1.5.2 Signal Attenuation.
- 1.1.5.3 Signal Fading.
- 1.2 Wireless Challenges.
- 1.2.1 Multiple Access Techniques.
- 1.2.1.1 FDMA.
- 1.2.1.2 TDMA.
- 1.2.1.3 TDMA vs. CDMA.
- 1.2.1.4 CDMA and TDMA Trends.
- 1.2.1.5 CDMA.
- 1.2.1.6 Advantages of Multiple Accesses.
- 1.2.1.7 Coverage Area.
- 1.2.1.7.1 Line Configuration.
- 1.2.1.7.2 Ring Configuration.
- 1.2.1.7.3 Star Configuration.
- 1.3 CDMA Principles.
- 1.3.1 FHSS (Frequency Hopping Spread Spectrum)
- 1.3.2 DSSS (Direct Sequence Spread Spectrum)
- 1.3.3 Advantages of Spread Spectrum..
- 1.3.3.1 Reduced Crosstalk Interference.
- 1.3.3.2 Better Voice Quality/Data Integrity and Less Static Noise.
- 1.3.3.3 Lowered Susceptibility to Multipath Fading.
- 1.3.3.4 Inherent Security.
- 1.3.3.5 Co-Existence.
- 1.3.3.6 Longer Operating Distances.
- 1.3.3.7 Hard to Detect
- 1.3.3.8 Hard to Intercept or Demodulate.
- 1.3.3.9 Harder to Jam..
- 1.4 CDMA Advantages.
- 1.5 CDMA and GSM Networks.
- 1.5.1 Advantages of CDMA over Other Systems.
- 1.6 CDMA History.
- 1.7 OFDM...
- 1.7.1 The General Usage of OFDM...
- 2 CDMA Discrimination Codes.
- 2.1 Walsh Code.
- 2.1.1 Overview..
- 2.1.2 Walsh Code Creation.
- 2.2 Short Code.
- 2.3 Long Code.
- 2.4 Rake Receiver.
- 3 Power control.
- 3.1 Why Power Control?.
- 3.2 CDMA Power Control.
- 3.2.1 Reverse Open Loop Power Control
- 3.2.2 Reverse Closed Loop Power Control
- 3.2.3 Reverse Outer Loop Power Control
- 3.2.4 Forward Traffic Channel Power Control
- 4 4G new standards.
- 4.1 Objectives of the Fourth Generation.
- 4.2 The Shift from 3G toward 4G..
- 4.3 Spread Spectrum as a 4G Standard.
- 4.4 OFDMA as 4G Standard.
- 4.5 802.11n as 4G Standard.
- 4.6 802.16 As 4G Standard.
- 4.6.1 WiMAX Applications.
- 4.6.2 How WiMAX Works.
- 4.6.3 WiMAX Modulation Schemes.
- 4.6.3.1 Scalable OFDMA (SOFDMA)
- 4.6.3.2 Turbo coding.
- 4.6.3.3 Low density Party Check.
- 4.6.4 Adaptive Antenna Systems (AAS)
- 5 The future of CDMA and spread spectrum...
- 5.1 What is the CDMA Replacement?.
- 6 The Future of Mobile Vendors.
- 6.1 Meeting Market Growth.
- 6.2 Wireless Systems Future.
- 6.3 Increased Competition in the New Standards.
- 7 References.
- Table of Figures
- Figure 1 - Signal Reflection and Fading.
- Figure 2 - FDMA Power, Frequency and Time.
- Figure 3 - FDMA Frequency Response.
- Figure 4 - TDMA Time Frame.
- Figure 5 - TDMA Power, Frequency and Time.
- Figure 6 - CDMA Power, Frequency and Time.
- Figure 7 - Multiple Access Management System..
- Figure 10 - Frequency Hopping in CDMA..
- Figure 11 - Desired Signal Hope in CDMA..
- Figure 12 - Transmitter Interference.
- Figure 13 - OFDM Wireless LAN Receiver.
- Figure 14 - Mobile Unit Transmitter.
- Figure 15 - How WiMAX Works.
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