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This book explains the basic components, technologies used, and operation of IS-95 CDMA systems. You will discover why mobile telephone service providers have upgraded from 1st generation analog systems to more efficient and feature rich 2nd generation systems. You will also discover how 2nd generation systems are gradually evolving into 3rd generation broadband multimedia more....
There are more than 21 explanatory diagrams in this book
Code Division Multiplexing
This figure shows how a single direct sequence spread spectrum communication channel can have several channels. In this example, there are 3 different code patterns that are used for communication channels. When a receiver uses the reference code, a direct sequence spread spectrum system can build a mask as shown in this figure for each conversation allowing only that information which falls within the mask to be transmitted or received.
Open Loop Power Control
This diagram shows how open loop RF power control can be used in a mobile telephone system to provide approximately the same level of RF signal received by the base station from the mobile telephone regardless of the distance the mobile telephone is located from the base station. This diagram shows that the mobile telephone's coarse (open loop) RF amplifier adjustment is controlled by feedback from its receiver section. The mobile telephone continuously measures the radio signal strength received from the base station to estimate the signal strength loss between the base station and mobile telephone. This diagram shows that as the mobile telephone moves away from the base station, the received signal level decreases. When the received signal is stronger, the mobile telephone reduces its own RF signal output; conversely, when the mobile received signal level is weaker, the mobile telephone increases the amplification of its own RF signal output. The end result is that the signal received at the base station from the mobile telephone remains at about at the same power level regardless of the mobile telephone's distance.
This figure shows an overview of a CDMA2000 radio system. This diagram shows that there are several types of devices that can be used in the CDMA2000 system. These include CDMA2000 multiple bandwidth radios and IS-95 CDMA compatible mobile telephones. The CDMA2000 mobile telephone devices are usually capable of operating as IS-95 CDMA and CDMA2000 mobile radios. This diagram also shows that the CDMA2000 system can mix and combine standard 1.25 MHz wide IS-95 channels into the 3.75 MHz CDMA2000 channels.
Table of Contents
CODE DIVISION MULTIPLE ACCESS (CDMA)
CDMA2000 SYSTEM OVERVIEW
IS-95 CDMA Core System
IS-95 CDMA SYSTEM
Spreading (Walsh) Codes in IS-95 CDMA
Channel Coding and Modulation
CDMA Coded Channels
IS-95 CDMA System Attributes and Features
CDMA2000 Radio Channels
Radio Configurations (RC)
Physical Radio Carriers (Channels)
About the Author
Mr. Lawrence Harte has over 29 years of experience in the electronics industry including company leadership, product management, development, marketing, design, and testing of telecommunications (cellular), radar, and microwave systems. He has been issued patents relating to cellular technology. He has authored over 75 articles on related subjects and has been a speaker and panel moderator at industry trade events. Mr. Harte earned executive MBA at Wake Forest University and received his Bachelors degree from University of the State of New York. During the TDMA digital cellular standard development process, Mr. Harte served as an editor and voting company representative for the Telecommunications Industries Association (TIA) TR45.3, digital cellular standards committee. As of 2003, Mr. Harte had authored and co-authored over 20 books relating to telecommunications technology. He has served as a consultant and expert witness for leading companies including Ericsson, Siemens, VLSI, AMD, Casio, Samsung, Sony, ATT, Nokia, Hughes and many others.
This book explains the basic components, technologies used, and operation of IS-95 CDMA systems. You will discover why mobile telephone service providers have upgraded from 1st generation analog systems to more efficient and feature rich 2nd generation systems. You will also discover how 2nd generation systems are gradually evolving into 3rd generation broadband multimedia systems.
This book starts with the system components and basic services that the IS-95 CDMA system can provide. You will learn that the key types of CDMA devices include external radio modems, wireless PCMCIA cards, embedded radio modules, single mode and dual mode mobile telephones. You will then discover the different types of available services such as multiple types of voice services, data services, messaging services, and position location services.
Explained are the physical and logical radio channel structures of the CDMA systems along with the basic frame and slot structures. Described are the fundamental capabilities and operation of the CDMA radio channel including channel coding, modulation types, variable speech coding, precise power control, and soft handoff. You will learn how each CDMA radio channel has 64 channel codes and that some of these are used for signaling (control channels) and others are used for user traffic (voice and data). Because the needs of voice and data communication are different, you will discover that the CDMA system essentially separates circuit switched (primarily voice) and packet switched (primarily data) services.
Described are key functional sections of a CDMA network components and how they communicate with each other. You will learn how and why IS-95 CDMA is evolving into 3rd generation broadband systems including EVDO, EVDV, and CDMA2000. Some of the most important topics featured in this book are:
• How CDMA systems operate
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• CDMA voice, data, and multimedia services
• The types of CDMA products and their uses
• The CDMA radio channel structure
• The different types of physical and logical channels
• CDMA network components
• Speech coding, power control, and soft handoff
• Network components and their connections
• How CDMA technology is evolving into EVDO, EVDV, and CDMA2000