Digital Communications with Emphasis on Data Modems

PREFACE

The material in this book contains sufficient mathematical background to challenge the graduate student and to allow the experienced communication systems engineer to analyze, specify, and select optimum solutions for a variety of applications. Furthermore, it is hoped that the many performance plots, tables, and design concepts will prove beneficial to system design engineers who are less inclined to delve into the mathematical rigors. The importance of communication systems performance simulations cannot be overstated as a developmental tool prior to the software and hardware designs. Computer simulations allow the designer to predict the system performance beyond the assumptions leading to mathematical models. In nearly every chapter to follow, the results presented have been verified using computer simulations and found to be in agreement with the theoretical results.

Although the material presented in this book focuses on the modulator and demodulator (modem) subsystems, the transmitter and receiver (transceiver) subsystems and the corresponding antenna subsystems must be considered in order to evaluate the overall communication link performance. Furthermore, the design of these subsystems is influenced by the communication channels that are broadly characterized as wireline and wireless or radio frequency (RF) channels.

The modulator, transmitter, and transmitter antenna subsystems function together with inputs from an information source. Similarly, the receiver ...