H/DPSK-16, have been superimposed on Figure 2.14. We note that, asymp- totically, FH/DQASK-16 outperforms FH/DPSK-16 by 3.283 dB for worst case tone jamming and 3.55 dB for worst case noise jamming. 2.6 REFERENCES [1] S. W. Houston, "Modulation techniques for communication, Part I: Tone and noise jamming performance of spread spectrum M-ary FSK and 2, 4-ary DPSK waveforms," NAECON '75 Record, pp. 51-58. [2] M.K. Simon, G. K. Huth, and A. Polydoros, "Differently coherent detection of QASK for frequency-hopping systems; Part I: Performance in the presence of a Gaussian noise background," IEEE Trans. Commun., COM-30, no. 1, pp. 158- 164, January 1982. [3] M. K. Simon, "Differentially coherent detection of QASK for frequency- hopping systems; Part II: Performance in the presence of jamming," IEEE Trans. Commun., COM-30, no. 1, pp. 164-172, January 1982. M.K. Simon, "The Performance of M-ary DPSK/FH in the Presence of Partial- Band Multitone Jamming, " IEEE Trans. Commun., Special Issue on Spread Spectrum Communications, COM-30, no. 5, pp. 953-958, May 1982. [5] W. C. Lindsey and M. K. Simon, Telecommunication Systems Engineering, Englewood Cliffs, NJ: Prentice-Hall, 1973, Chapter 5. [6] J. T. Fleck and E. A. Trabka, "Error Probabilities of Multiple-State Differentially Coherent Phase Shift Keyed Systems in the Presence of White, Gaussian Noise," Detect Memo No. 2A in Investigation of Digital Data Communication Systems, Report No. UA-1420-S-1, J. G. Lawton, ed., Cornell Aeronautical Laboratory, Inc., Buffalo, NY, January 1961. Available as ASTIA Document No. AD 256 584. [7] J. H. Roberts, S. O. Rice, and R. F. Pawula, "Distribution of the phase angle between two vectors perturbed by Gaussian noise," IEEE Trans. Commun., COM-30, no. 8, pp. 1828-1841, August 1982. [8] M.K. Simon and J.G. Smith, "Carrier synchronization and detection of QASK signal sets," IEEE Trans. Commun., COM-22, no. 2, pp. 98-106, February 1974. This Page Intentionally Blank Chapter Part 4 SYNCHRONIZATION OF SPREAD-SPECTRUM SYSTEMS This Page Intenti