Communication Systems and Techniques Volume 747 || Appendix A. The Q Function and Related IntegralsThis Appendix is largely adapted from S. Stein, The QFunction and Related Integrals, Research Report 467, Applied Research Laboratory, Sylvania Electronic Systems, July, 1965.The Q function was introduced in: J. I. Marcum, A Statistical Theory of Target Detection by Pulsed Radar, IRE Trans. Inform. Theory, vol. IT6, pp. 59267, April, 1960; earlier Rand Corp. Res. Memos RM753, July, 1948 and RM754, December, 1947; J. I. Marcum, Tables of the Qfunction, Rand Corp. Res. Memo RM399, January, 1950.Examples of literature on machine computation of the Q function are: A. R. DiDonato and M. P. Jarnagin, A Method for Computing the Circular Coverage Function, Mathematics of Computation, vol. 16, pp. 347355, July, 1962; D. E. Johansen, New Techniques for Machine Computation of the Qfunctions, Truncated Normal Deviates, and Matrix Eigenvalues, Applied Research Laboratory, Sylvania Electronic Systems, AFCRL556, July, 1961.