CONTENTS
xvii
17.6
Two-Way CATV Systems
448
17.6.1
Introduction
448
17.6.2
Impairments Peculiar to Upstream Service
451
17.7
Two-Way Voice and Data over CATV Systems Based on
the DOCSIS 2.0 Specification
451
17.7.1
General
451
17.7.2
Layer 1--Physical Layer
452
17.7.3
Layer 2--Data-Link Layer
453
17.7.4
Layer 3 and Above
454
17.8
Subsplit/Extended Subsplit Frequency Plan
454
17.9
Other General Information
454
17.9.1
Frequency Reuse
454
17.9.2
Cable Distance Limitations
454
Review Exercises
454
References
455
Chapter 18
Cellular and PCS Radio Systems
457
18.1
Introduction
457
18.1.1
Background
457
18.1.2
Scope and Objective
458
18.2
Basic Concepts of Cellular Radio
458
18.3
Radio Propagation in the Mobile Environment
462
18.3.1
The Propagation Problem
462
18.3.2
Propagation Models
463
18.4
Impairments: Fading in the Mobile Environment
464
18.4.1
Introduction
464
18.4.2
Diversity: A Technique to Mitigate the Effects
of Fading and Dispersion
465
18.4.3
Cellular Radio Path Calculations
467
18.5
The Cellular Radio Bandwidth Dilemma
468
18.5.1
Background and Objectives
468
18.5.2
Bit Rate Reduction of the Digital Voice Channel
468
18.6
Network Access Techniques
468
18.6.1
Introduction
468
18.6.2
Frequency Division Multiple Access (FDMA)
469
18.6.3
Time Division Multiple Access (TDMA)
469
18.6.4
Code Division Multiple Access (CDMA)
472
18.7
Frequency Reuse
476
18.8
Personal Communications Services (PCS)
478
18.8.1
Defining Personal Communications
478
18.8.2
Narrowband Microcell Propagation at PCS
Distances
478
18.9
Cordless Telephone Technology
481
18.9.1
Background
481
18.9.2
North American Cordless Telephones
481
18.9.3
European Cordless Telephones
481
18.10
Wireless LANs
483