A correction scheme for measurement accuracy improvement in multichannel CATV systems
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AbstractMany commercially-available oscilloscopes offer the FFT-based spectral analysis capability and it is one of the most economical ways to perform spectral measurement. However, the measurement accuracy is always degraded by the incomplete-cycle sampling present in FFT. Such degradation in the FFT-based measurement of multichannel CATV systems is investigated. It severely degrades the spectral amplitude accuracy as well as the frequency resolution, both of which are important in deriving the system parameters such as CTB, CSO, and CNR. The undesirable effect is formulated mathematically for multichannel systems and the result is useful to obtain more accurate spectral values. Windowing and a proposed correction method are used to alleviate such detrimental effects, and an improvement of 3-5 dB in CTB measurement is achieved with the proposed correction scheme. A procedure to achieve better spectrum analysis for multichannel CATV systems is also presented. The analysis and the proposed schemes can improve the accuracy in the FFT-based measurements of multichannel CATV systems than the traditional windowing method.
All Author(s) ListChan CK, Chen LK
Journal nameIEEE Transactions on Broadcasting
Volume Number42
Issue Number2
Pages122 - 129
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesEngineering; Engineering, Electrical & Electronic; ENGINEERING, ELECTRICAL & ELECTRONIC; Telecommunications; TELECOMMUNICATIONS

Last updated on 2020-03-04 at 23:09