I, that this distance is two for all sequences with length greater Poisson rate parameter is assumed to be constant under H , than two. This implies that the optimum observation interval and H 1 over the entire observation interval (0, T),' then is 2 T. REFERENCES[ 1 ] R. de Buda, "Coherent demodulation of frequency-shift keying with low deviation ratio,'> IEEE nuns, commun., vel. COM-20, where the threshold A is now a function of the known conpp. 429-435, June 1972. stant received signal and noise through the parameters ho and of PCM/FM with random waveforms,*' IEEE T~~~~. space ~l~~-hl ; ho(t) = XO and AI ( t ) = A I . This statistic can also be obtron. Telem., vol. SET-10, pp. 39-44, Mar. 1964. tained [ 11 by considering immediately the distribution of the [31 v. A. Kotel'nikov, The Theory of Optimum Noise Immunity. photocounts per bit time to be a Poisson random variable K New York: McGraw-Hill, 1959, p. 40. [ 2 ] M. G. Pelchat, "The autocorrelation function and power spectrum under the hypotheses H I and Ho, and applying the maximum likelihood decision strategy "decide H I if the likelihood ratio R ( k ) satisfies Optical Communication System Performance with Tracking Error Induced Signal Fading M. TYCZ, M. W. FITZMAURICE, AND D. A. PREMOAbsfrucf-System performance is determined for an optical communication system using noncoherent detection in the presence of tracking error induced signal fading assuming I) binary on-off modulation (OOK) with both fixed and adaptive threshold receivers, and 2) binary polarization modulation (BPM). BPM is shown to maintain its inherent 2-3 dB advantage over OOK when adaptive thresholding is used, and to have a substantially greater advantage when the OOK system is restricted to a fixed decision threshold.
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