TABLE OF CONTENTS This chapter introduces the basic design approach for anti-jam communications and presents two simple idealized examples of such systems, specifically coherent direct-sequence spread, binary phase-shift-keying (DS/ BPSK), and non-coherent frequency-hopped binary frequency-shift-keying (FH/BFSK) systems opposed by various jammer waveforms. Ideal signal parameter acquisition and synchronization is assumed throughout this chapter. Ground rules for system performance analysis are specified by stating assumptions regarding jammers and anti-jam systems along with definitions of the fundamental system parameters used throughout this three-volume work. Because coding and interleaving are extremely important in anti-jam system design, the impact of these techniques is illustrated with examples. The purpose of this chapter is to exemplify basic concepts with simple examples which serve as an introduction to the more advanced material in Part 1 , Chapter 4 , and Part 2 , Chapters 1 and 2 . The material in this and the previously mentioned chapters is based in part on the works of Jacobs and Viterbi [1 ], Houston [2 ], Scholtz [3 ], Viterbi [4 ], Clark and Cain [5 ], and Pickholtz et al. [6 ].
How can a receiver overcome the effects of intentional jamming, particularly when the jammer has much more power than the transmitted signal? Classical communication theoretic investigations of the additive white Gaussian noise channel suggest the answer. White Gaussian noise is a mathematical model which has infinite power, spread uniformly over all frequencies.
