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Signals in a non cooperative communication environment such as in the high frequency (HF) spectrum are generally unknown in nature. There is a need for true spectrum monitoring where the information of the signal is made known as in spectrum management and intelligence gathering. In the spectrum surveillance system, the features that are estimated are: the measurement of signal strength and carrier...
This paper evaluates at the various modulation and coding techniques suitable for adaptive data communication system. The techniques evaluated are applicable to HF spectrum. Examples of modulation and coding scheme that are evaluated include PACTOR I, PACTOR II, PACTOR III, GTOR and STANAG 4285. Analysis of system performance is made in the presence of AWGN with future extension for multipath fading...
In this paper, we compare the performance of spectrogram and a new variation of multi-window (MW) spectrogram for various digital modulated signals. The windows used in the MW spectrogram are combination of Slepian sequences instead of using all the sequences. The comparison in the time-frequency representation is made in terms of main-lobe width (MLW) and peak to side-lobe ratio (PSLR) of the signals...
A non cooperative communication environment such as in the HF (high frequency) spectrum is when the signals present are unknown in nature. This is essentially true spectrum monitoring that is an activity in spectrum management and intelligence gathering. An instrument that is used for this purpose is a spectrum surveillance system whose features are: the measurement of signal strength and carrier...
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