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This paper describes problems of multi-level classification of real M-PSK modulated signal frames by using methods based on constellation shapes. Modulation classifiers which automatically recognise the type of modulation in HF band have been developed. One of the oldest of modulation recogniser uses a bank of demodulators. Each of demodulaters is recognized only one type of modulation.
Multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) is known as a high capacity system for data transmission over broadband wireless communication channels. However, the time-varying fading and Doppler effect of the underwater acoustic channel can destroy the orthogonality of subcarriers, causing intercarrier interference (ICI). In this paper, we proposed a combined...
Perspective method for the monitoring and on-line modulation analysis in the HF band is presented in this paper. The workplace for the on-line analysis of analog and digital modulations consists from the digital receiver IZ225 and a PC with adequate SW. The original program for the on-line modulation signal analysis was designed in the programming environment CipherCAD. The type of modulation, its...
This paper deals with perspective methods of radar pulses classification. Ability to classify pulses is required by ELINT in order to deinterleave signals and unambiguously identify the source of analyzed signal. Experiments has shown that the best classification methods are based on auto-correlation, cross-correlation, and frequency spectrum analysis. Some other pulse feature are incorporated for...
This paper describes perspective methods for the modulation recognition in HF and VHF bands. Automatic modulation recognition is rapidly evolving signal analysis area. The modern systems of signal processing can utilize cyclostationary feature detection. This paper provides the brief description of time domain key descriptor — cyclic autocorrelation function and frequency domain key descriptor — spectral...
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