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Continuous phase modulation (CPM) is a widely used modulation scheme in communication systems. However, difficulties arise with the design of CPM receivers, due to the nonlinear nature of CPM. One popular solution to this problem is to linearize CPM with pulse amplitude modulation (PAM) representation. In this paper, a reduced-complexity superbaud timing recovery method is proposed for PAM-based multi-h...
In this letter, a clock-aided and data-aided frequency recovery method for shaped offset quadrature phase shift keying (SOQPSK) signals is proposed. Based on the pulse amplitude modulation (PAM) representation of continuous phase modulation (CPM), we eliminate the modulation of the SOQPSK signals and thus the problem turns to be the frequency estimation of a complex sinusoid in complex noise. It is...
A climatology of extratropical cyclones (ECs) over East Asia (20°−75°N, 60°−160°E) is analyzed by applying an improved objective detection and tracking algorithm to the 4-time daily sea level pressure fields from the European Centre for Medium-range Weather Forecasts (ECMWF) reanalysis data. A total of 12914 EC processes for the period of 1958–2001 are identified, with an EC database integrated and...
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