This book provides an excellent mix of theory and practice. Starting with information theory and classical coding theory, the text covers the message passing concept that forms the basis of modern coding techniques, including turbo codes and Low Density Parity Check (LDPe codes, and then discusses a large number of turbo code combinations - including industry standards such as DVB-RCS, 3GPP, and CDMA2000. Numerous implementation issues and examples of commercially available turbo codes and products are explored in detail. This comprehensive treatment of the topic will enable the reader to select, evaluate, and implement the turbo code suitable for their application. Programs for the simulation of several turbo coding schemes, including those in DVB-RCS and 3GPP standards, are included in the accompanying CD-ROM. These C programs can be easily used for simulation and performance evaluation and serve as a starting point for a design effort. FPGA, ASIC, and DSP sample implementations are also presented. Source files, instead of executables, are included so that the reader can modify the programs and tailor them to his/her needs. Practising engineers involved in the design of communication circuits and systems and graduate students conducting research in the area of digital communications will benefit from this balanced and insightful treatment. The coverage of different system level concepts, various wireless and satellite communications standards, and the available turbo code products makes this work a valuable reference for engineering managers.

6. 5 137 7 Performance of BTCs and 139 their Applications 7. 1 Introduction 139 7. 2 Some Results from the Literatures 139 7. 3 Applications of Block Turbo Codes. 142 7. 3. 1 Broadband Wireless Access Standard 144 7. 3. 2 Advanced Hardware Architectures (AHA) 145 7. 3. 3 COMTECH EF DATA 147 7. 3. 4 Turbo Concept 149 7. 3. 5 Paradise Data Com 150 Summary 7. 4 151 8 Implementation Issues 153 8. 1 Fixed-point Implementation of Turbo Decoder 153 8. 1. 1 Input Data Quantization for DVB-RCS Turbo Codes 155 8. 1. 2 Input Data Quantization for BTC 157 8. 2 The Effect of Correction Term in Max-Log-MAP Algorithm 159 8. 3 Effect of Channel Impairment on Turbo Codes 163 8. 3. 1 System Model for the Investigation of Channel Impairments 163 8. 3. 2 Channel SNR Mismatch 164 8. 3. 2. 1 Simulation Results 165 8. 3. 3 Carrier Phase Recovery 170 8. 3. 3. 1 The Effect of Phase Offset on the Performance of RM Turbo Codes 170 8. 3. 3. 2 The Effect of Preamble Size on the Performance of RM Turbo Codes 170 8. 3. 3. 3 Simulation Results 170 8. 4 Hardware Implementation of Turbo Codes 171 8. 5 Summary 175 9 177 Low Density Parity Check Codes 9. 1 Gallager Codes: Regular Binary LDPC Codes 177 9. 2 Random Block Codes 178 9. 2. 1 Generator Matrix 179 9. 2.