OFDM for wireless communications systems / Ramjee Prasad.

Format:

Book

Author/Creator:

Prasad, Ramjee.

Series:

Artech House universal personal communications series

Language:

English

Subjects (All):

Wireless communication systems.

Multiplexing.

Orthogonalization methods.

Physical Description:

xv, 272 pages : illustrations ; 27 cm.

Place of Publication:

Boston : Artech House, [2004]

Summary:

Written by a leading authority, this timely new work offers today's wireless professionals a complete understanding of OFDM technology and applications in wireless communications systems, placing emphasis on wireless LANs (local area networks) and PANs (personal area networks).

Contents:

1.1 Wireless Technology in the Future 1

1.1.1 WWANs 3

1.1.2 WLANs 4

1.1.3 WPANs 5

1.1.4 WB-PANs 6

1.1.5 The Next Generation 7

1.2 Orthogonal Frequency-Division Multiplexing 11

1.2.1 History of OFDM 11

Chapter 2 WLANs 19

2.1.2 IEEE 802.11, HIPERLAN/2, and MMAC WLAN Standards 23

2.2 MAC in WLAN Standards 27

2.2.1 IEEE 802.11 27

2.2.2 HIPERLAN/2 31

2.3 QoS over WLANs 33

2.3.1 IEEE 802.11e 33

2.3.2 Interframe Spacing 35

2.3.3 Other QoS-Related Developments 36

2.4 Security in IEEE 802.11 36

2.4.1 Current IEEE 802.11 36

2.4.2 IEEE 802.11i and IEEE 802.11f 39

Appendix 2A ISM Bands 46

Appendix 2B Comparison of WLAN and WPAN Standards 47

Chapter 3 WPANs 49

3.1.1 Emergence of Personal Area Networking (The Person-Centered Concept) 49

3.2 Technical Challenges of a WPAN Technology 54

3.2.1 Ad Hoc Connectivity 55

3.2.2 Service Discovery and Resource Selection 56

3.3 Enabling Technologies 57

3.3.1 Comparison of Short-Range Wireless Technologies 60

3.4 Ongoing Research 60

3.4.1 Architecture and Middleware Issues 60

3.5 Research Issues for Future WPAN Technology 73

Chapter 4 Appropriate Channel Model for OFDM Systems 83

4.2 Characterization of the Mobile Radio Channel 84

4.2.1 Components of a Multipath Channel Model 84

4.2.3 Variation of Channel Parameters Due to Bandwidth Limitation 90

4.3 FD Channel Modeling 90

4.3.1 The WSSUS Channel Model 91

4.3.2 Channel Description 94

4.3.3 Relation to (Physical) Channel Parameters 95

4.4 FD Channel Simulation 97

4.4.1 Model Description 98

4.4.2 Implementation of the Simulation Scheme 99

4.4.3 FD Simulation Results 100

4.4.4 Differences from Time-Domain Simulation Schemes 104

4.5 Application to Millimeter-Wave Radio Channels 104

4.5.1 Discussion of Measurement Results 105

4.5.2 Discussion of Channel Parameters 106

4.5.3 Overview of Channel Models 110

4.5.4 Applicability of the FD Model 111

Chapter 5 Basics of OFDM and Synchronization 117

5.2 OFDM Introduction and System Model 117

5.2.1 OFDM Introduction and Block Diagram 118

5.2.2 Design of the OFDM Signal 120

5.2.3 OFDM System Model 123

5.2.4 Synchronization Errors 128

5.3 Performance of an Uncoded OFDM System 133

5.3.1 Mathematical Modeling 133

5.3.2 Analytical Evaluation of the BER 134

5.3.3 Performance Results 141

Chapter 6 The Peak Power Problem 149

6.2 Distribution of the PAP Ratio 150

6.3 Clipping and Peak Windowing 152

6.3.1 Required Backoff with a Nonideal Power Amplifier 155

6.3.2 Coding and Scrambling 158

6.4 Peak Cancellation 160

6.5 PAP Reduction Codes 166

6.5.1 Generating Complementary Codes 167

6.5.2 Minimum Distance of Complementary Codes 171

6.5.3 Maximum-Likelihood Decoding of Complementary Codes 172

6.5.4 Suboptimal Decoding of Complementary Codes 174

6.5.5 Large Code Lengths 177

6.6 Symbol Scrambling 177

Chapter 7 A Novel Hybrid OFDM Concept 183

7.2 Detailed Structure of Various Multiple-Access Schemes 184

7.2.1 Overview of Various Modulation Schemes 184

7.2.2 DS-CDMA 187

7.2.3 SFH Interface 188

7.2.4 OFDM/CDMA/SFH System Description 191

7.3 Comparison to MC-CDMA 197

7.3.3 The Hybrid System 201

7.3.4 Comments on the MC-CDMA Technique 202

7.4 Analytical Performance in Fading Channels and Simulation in AWGN Channels 206

7.4.1 Comparison of DS-CDMA and DS-CDMA-SFH (DS-SFH) Systems 206

7.4.2 Noncoherent Class of Signals (DS-CDMA) 206

7.4.3 DS-CDMA-SFH 208

7.4.4 Coherent Class of Signals 211

7.4.5 OFDM-CDMA-SFH (Hybrid) 211

7.4.6 Simulations 213

7.5 Performance in Fading Channels with Perfect Estimation 215

7.5.1 FD Modeling 215

7.5.2 Analytical Evaluation of the BER 216

7.5.3 Coherent Detection with Perfect Channel Estimation 218

7.5.4 Calculation of the Parameters 219

7.5.5 Simulations with Perfect Channel Estimation 220

7.6 Performance in Fading Channels with Realistic Estimation 229

7.6.1 Baseband Model 230

7.6.2 Channel Estimation with TDP Method 231

7.6.3 Simulated OFDM System Parameters 235

7.6.4 Simulation Results for QPSK/16-QAM 235

Chapter 8 A Practical OFDM System: Fixed Broadband Wireless Access (FBWA) 243

8.2 Motivation 243

8.2.1 Cell-Based Infrastructure 244

8.2.2 Mesh Topology-Based Infrastructure 245

8.3 Proposed FBWA 245

8.4 Systems Requirements 248

8.4.1 Parameter Selection 249

8.4.2 Communications Protocol 249

8.4.3 Duplex Schemes 250

8.4.4 Downlink Transmission 250

8.4.5 Uplink Transmission 252

8.4.6 Frame Structure 253

8.4.7 MAC Consideration and Conformance 254

8.4.8 Adaptability of the Proposed Kernel Architecture to BWAS 256

8.5 Ubiquitous Connectivity 256.

Notes:

Includes bibliographical references and index.

ISBN:

1580537960

OCLC:

55729868