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SECTION III: TECHNOLOGY


11	Audio Techniques
11.1	Speech Coding
11.1.1		Pulse Code Modulation
11.1.2		Adaptive Differential PCM (G.721, G.726)
11.1.3		Delta Modulation
11.1.4		Linear Predictive Coding 
11.1.5		Algebraic Code-Excited Linear Prediction (G.729)
11.1.6		Enhanced Full-Rate (EFR) Vocoder
11.1.7		Low-Delay Code-Excited Linear Prediction (G.728)
11.1.8		Speech Quality
11.1.9		Codec Suitability
11.1.10		Channel Coding
11.2	Voice Transmission Plan
11.2.1		Definitions
11.2.2		Transmission Plan for a Digital Cordless Telephone System 
11.2.3		Transmission Plans for Specific Systems
11.3	Delay and Echo Control
11.3.1		Criteria for Acceptable Echoes
11.3.2		Echo Control at International Gateways
11.3.3		Echo Control for Non-International Circuits
11.3.4		Requirements and Solutions for Specific Systems
11.4	Voice Security and Speech Encryption
11.5	Summary

12	The Radio Channel
12.1		Choice of Operating Frequency
12.1.1		Spectrum Allocation
12.1.2		Constraints on Spectrum Choice
12.2		Spectrum Requirements
12.2.1		Traffic Density
12.2.2		Spectrum Re-Use Principles
12.2.3		An Analytical Estimate of Spectrum Needs
12.3		In-Building Radio Coverage
12.3.1		In-Building Coverage using Basestation Antennas
12.3.2		In-Building Coverage using Leaky Feeders
12.4		The Dispersive Channel
12.4.1		Time and Frequency Dispersion
12.4.2		The Impact of Delay Spread 
12.5		System Capacity and Grade of Service
12.5.1		Automatic Channel Assignment Strategies
12.5.2		Approaches to System Capacity Modelling
12.6		Usage of the Radio Channel
12.6.1		Duplex Transmission
12.6.2		Multiple Access Techniques
12.6.3		Dynamic Channel Assignment
12.7		Modulation Schemes
12.7.1		Digital Modulation Requirements
12.7.2		Phase Shift Keying
12.7.3		Frequency Shift Keying
12.7.4		Minimum Shift Keying
12.7.5		Gaussian filtered MSK
12.8		Error Correction and Detection
12.9		Protocol Layers
12.10	Summary

13	Cordless Access Neworks
13.1	Types of Cordless Networks
13.1.1		Domestic Systems
13.1.2		Business Systems
13.1.3		Public Access Networks
13.2	Network Functionality
13.2.1		Call Control
13.2.2		Mobility Management
13.2.3		Supplementary Services
13.2.4		Traffic Interworking
13.3	Summary

14	Cordless Data and Multimedia
14.1 	Benefits of Cordless Data 
14.2	Data Services and Attributes
14.2.1		Voice
14.2.2		Facsimile
14.2.3		VDU and Keyboard Terminal
14.2.4		Wideband Services
14.3  	Applications 
14.4	Architectures
14.5	Transmission Media
14.5.1 		Infrared Systems
14.5.2 		Radio Systems
14.6	Cordless LAN Standards Activities
14.6.1		The IEEE 802.11 Standard
14.6.2		The DECT Data Standards
14.6.3		The HIPERLAN Standard
14.7	DECT Cordless LAN Technology 
14.7.1		The DECT Architecture
14.7.2		Topology 
14.7.3		Performance 
14.8	Cordless Multimedia 
14.8.1		Cordless Modems
14.8.2		Cordless Video
14.9	Summary 

15	Architectures and Implementation 
15.1	System Architecture
15.2	Baseband Design
15.2.1		Baseband Controller
15.2.2 		System Software
15.2.3		Program Memory
15.2.4		Non-Volatile Memory
15.2.5		Microphone Interface
15.2.6		Ear Piece
15.2.7		Alerting Element
15.2.8		Keypad
15.2.9		Supply Regulation
15.2.10 	Battery Monitoring
15.2.11 	Low Battery Supervision
15.2.12 	Shut-Down Timer
15.2.13 	Batteries
15.2.14 	Mechanical Considerations
15.2.15		Acoustic Considerations
15.3	Radio Receiver Architecture and Design
15.3.1		Superheterodyne Receiver
15.3.2		Filter Technology
15.3.3		Direct Conversion Receivers
15.3.4		Demodulation
15.4	Radio Transmitter Architecture and Design
15.4.1		Local Oscillator
15.4.2		Modulation
15.4.3		Direct Modulation
15.4.4		I/Q Modulation
15.4.5		Transmit Power Amplifier
15.5 	Antenna Diversity
15.6	Analogue Cordless Implementation
15.6.1		UK CT0 Technology
15.6.2		CEPT CT1/CT1+ Technology
15.7	Digital Cordless Implementation
15.7.1 		ADPCM
15.7.2  	FDMA vs TDMA
15.7.3		CT2 Technology
15.7.4		DECT Technology
15.7.5 		System Software Development 
15.7.6 		Electromagnetic Compatibility 
15.8 	Future Trends
15.9	Summary

16	Future Evolution of Cordless Systems
16.1	Drivers & Enablers
16.1.1		Digital Cellular Radio
16.1.2		Mobility as a Basic Service
16.1.3		Telecommunications Liberalisation
16.1.4		Fixed and Mobile Service Integration
16.1.5		Increasing Market Segmentation
16.1.6		Growth in Data Access
16.1.7		Wireless Access in Developing Countries
16.1.8		Global Competition
16.2	Digital Cordless in Public Networks
16.2.1		The Operator's View
16.2.2		Cordless and Cellular
16.2.3		Cordless and Fixed Networks
16.3	Near Term Evolution
16.3.1		Technology Development
16.3.2		Dual Mode Handsets
16.3.3		Infrastructure Evolution
16.4	Summary

 

 

 
 
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