tailieunhanh - báo cáo hóa học: " Robustness of digitally modulated signal features against variation in HF noise model"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Robustness of digitally modulated signal features against variation in HF noise model | Hazza et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 24 EURASIP Journal on . http content 2011 1 24 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Robustness of digitally modulated signal features against variation in HF noise model Alharbi Hazza 1 Mobien Shoaib2 Alshebeili Saleh1 2 and Alturki Fahd1 Abstract High frequency HF band has both military and civilian uses. It can be used either as a primary or backup communication link. Automatic modulation classification AMC is of an utmost importance in this band for the purpose of communications monitoring . signal intelligence and spectrum management. A widely used method for AMC is based on pattern recognition PR . Such a method has two main steps feature extraction and classification. The first step is generally performed in the presence of channel noise. Recent studies show that HF noise could be modeled by Gaussian or bi-kappa distributions depending on day-time. Therefore it is anticipated that change in noise model will have impact on features extraction stage. In this article we investigate the robustness of well known digitally modulated signal features against variation in HF noise. Specifically we consider temporal time domain TTD features higher order cumulants HOC and wavelet based features. In addition we propose new features extracted from the constellation diagram and evaluate their robustness against the change in noise model. This study is targeting 2PSK 4PSK 8PSK 16QAM 32QAM and 64QAM modulations as they are commonly used in HF communications. Keywords Digital modulation features temporal time domain features higher order cumulants wavelet decomposition constellation diagram bi-kappa noise HF band Introduction Automatic modulation classification AMC is the process of identifying modulation type of a detected signal without prior information. This technique has both military and civilian applications and is .

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