The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a development of a RF system for the application specific message 2.0 (ASM2.0) which is a new maritime communication service in the VHF band. It contains a specification determination related to a RF system, some design points to support a complex modulation scheme for high-data-rate, and the implementation results. And, performances linked with a baseband (BB) system are also...
A generation method of a driving signal for a dual-mode supply modulator (DMSM) that supplies dual dc supply voltages to a power amplifier (PA) in a 3-level envelope delta-sigma modulator (EDSM) transmitter is proposed and confirmed by simulation and measurement. This method is feasible in terms that it generates a DMSM driving signal of trackable speed by the DMSM through a real-time operation in...
An advanced class-S transmitter architecture using a tri-level envelope encoding is presented. With tri-level encoding based on a delta-sigma modulator (DSM), a coding efficiency is improved compared to the two-level case, and sampling frequency is lowered to 522.24 MHz, which leads to an enhanced system efficiency. An analog/RF interface block is designed to control the propagation delay of the envelope...
A new signal processing method that partially encodes the envelope signal using a delta sigma modulator (EDSM) into a bi-level signal according to the magnitude of the envelope, has been introduced to utilize a high efficiency class-C amplifier for linear amplification. The RF signal is synthesized through the proposed envelope waveform, which is encoded into a pulse signal in the lower power region...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.