Theoretical and experimental investigations of FSK data transmission in the noise and interference environment of broadband two-way cable television systems Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5t34sp12k

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  • Two-way transmission of data on broadband community cable television systems is considered in this thesis. A discussion of the data transmission environment is presented which attempts to characterize the channel noise and interference which degrades data transmission performance. The analysis considers channel degradation resulting from additive gaussian noise and various amplitudes and frequencies of sinewave interference which simulate the noise and interference environment likely to be found on cable systems. To assess the impact of the channel noise and interference, noncoherent binary frequency shift keying (FSK) using frequency discriminator detection was chosen as the basis for a theoretical and experimental investigation. To simplify the analysis, a linear model of frequency discriminator detection is presented which provides useful results in situations where the signal-to-noise ratio is high. The model was tested against laboratory experiments using an idealized FSK data transmission channel with controlled amounts of noise and interference. A comparison of theoretical and experimental results show reasonably good agreement, thus validating the model for certain noise and interference circumstances which are applicable to data transmission on two-way cable television systems. The results show that with an FSK carrier-to-sinewave interference ratio of 6 dB, an increase in carrier-to-noise ratio of approximately 5 dB is required to achieve the same 1 X 10⁻⁹ error rate. The usefulness of the study results for predicting FSK data transmission performance can be improved by incorporating empirical statistical data on interference ingress in the return path of the cable system.
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