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Analog shortwave radio on bands up to 30 MHz has typically been limited in applicability for long-distance broadcast applications requiring high signal fidelity. This is because of the vulnerability of analog modulation schemes to atmospheric dispersion; however, the Digital Radio Mondiale (DRM) standard, introduced in 2001, is a promising solution for shortwave radio. DRM provides various audio and...
Radio communications possessing high signal quality and long-distance propagation have traditionally been difficult to achieve reliably over shortwave bands (up to 30 MHz). This is due to the analog modulation schemes in use and the vulnerability of shortwave radio to atmospheric disturbances. The development of the Digital Radio Mondiale (DRM) standard in 2001 provided digital coding methods, audio...
This paper proposes a dual-channel receiver, which consists of a frequency downconverter, analog to digital converter and digital demodulator, suitable for 3G power amplifiers characterization and digital predistortion. The active mixer based frequency downconverter is designed with a flexible and balanced architecture, which can provide superior performance including low intermodulation distortion,...
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