ineering, Englewood Cliffs, NJ: Prentice-Hall, 1973, chapter 5. M.K. Simon and J. .G. Smith, "Carrier synchronization and detection of QASK signal sets," IEEE Trans. Commun., COM-22, no. 2, February 1974. [4] M. K. Simon and A. Polydoros, "Coherent detection of frequency-hopped quadrature modulations in the presence of jamming; Part I: QPSK and QASK modulations," IEEE Trans. Commun., COM-29, no. 11, pp. 1644-1660, November 1981. [5] M. K. Simon, "Coherent detection of frequency-hopped quadrature modula- tions in the presence of jamming; Part II: QPR Class I modulation," IEEE Trans. Commun., COM-29, no. 11, pp. 1660-1668, November 1981. [6] N. E. Bekir, "Bounds on the Distribution of Partial Correlation for PN and Gold Sequences," Ph.D. Dissertation, Electrical Engineering Department, University of Southern California, January 1978. Coherent Modulation Techniques [7] R. W. Lucky, J. Salz and E. J. Weldon, Jr., Principles of Data Communications, New York: McGraw-Hill, pp. 85-86, 1968. [8] A. Lender, "The duobinary technique for high-speed data transmission," AIEE Trans. Commun. Electr., vol. 82, pp. 214-218, May 1963. [9] E. R. Kretzmer, "Generalization of a technique for binary data communica- tion," IEEE Trans. Commun. Syst., COM-14, pp. 67-68, February 1966. P. Kabal and S. Pasupathy, "Partial Response Signaling," IEEE Trans. Commun., COM-23, pp. 921-935, September 1975. Chapter Chapter 2 DIFFERENTIALLY COHERENT MODULATION TECHNIQUES Traditionally coherent modulations such as multiple phase-shift-keying (MPSK) and quadrature amplitude-shift-keying (QASK) can also be detected using differentially coherent techniques. These techniques are use- ful in applications where the receiver is unable to provide an exact carrier reference phase for demodulating each data symbol but is capable of estab- lishing a phase reference to within an arbitrary number of radians, say of the exact phase. By differentially encoding the transmitted phase infor- mation and using a form of phase difference detection, the phase ambi- guity 