TABLE OF CONTENTS This book discusses digital signal processing schemes that are potentially applicable to electronic warfare (EW) receivers. These receivers must have very wide instantaneous input bandwidth (about 1 GHz) to fulfill their operational requirements. This means any signal within the input bandwidth will be received all the time without tuning the receiver. On the contrary, a communication receiver has very narrow bandwidth. For example [1], television channels are allotted 6 MHz, frequency modulated (FM) radio channels are allotted about 200 kHz, and amplitude modulation (AM) stations are allotted only 10 kHz. If one turns on ten television sets simultaneously and each one is receiving a different channel, the instantaneous bandwidth of such an arrangement can be considered as 60 MHz (ten 6-MHz channels).
However, communication bandwidth is increasing because the wider the bandwidth, the more information per unit time can be transmitted from one point to another. Some anticipated communication systems would require 1 GHz of instantaneous bandwidth with 100 10-MHz channels [2]. If this trend continues, the difference between an EW receiver and a communication receiver will diminish. Further discussion with communication engineers reveals that many of the hardware considerations and digital signal processing approaches primarily designed for EW receivers are equally applicable to communication receivers. That is the reason for selecting the name of this book. The primary emphasis of this book would still be on EW receivers rather than on communication receivers. Most examples used in this book are from EW receivers.
