Search for dissertations about: "back-off"
Showing result 16 - 20 of 22 swedish dissertations containing the word back-off.
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16. Signal Shaping and Sampling-based Measurement Techniques for Improved Radio Frequency Systems
Abstract : Wireless communication systems are omnipresent in our day-to-day life, with high expectations regarding capacity, reliability and power efficiency. In order to satisfy the capacity and reliability expectations, today's wireless systems are adopting sophisticated modulation schemes, such as orthogonal frequency division multiplexing (OFDM), which shape today's wireless signals with large bandwidths and high crest factors. READ MORE
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17. Advanced Transmitter Architectures Based on Switch Mode Power Amplifiers
Abstract : Nowadays the main driving parameters for the research in radio transmitters in wireless infrastructure are energy efficiency, frequency agility, and integration.This thesis presents new solutions at the device waveform-, circuit-, and transmitter level which exploit the inherent high efficiency potential of switch-mode power amplifiers (SMPAs) for realization of energy efficient, wide-band, highly integrated transmitters for wireless communication applications. READ MORE
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18. High-efficiency Power Amplification Techniques for Wireless Transmitters
Abstract : The low efficiency of existing power amplifiers (PAs) is causing excessive energy consumption in wireless systems. Improving the PA efficiency is therefore of great environmental and economical importance. READ MORE
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19. Wide Bandgap Semiconductor (SiC & GaN) Power Amplifiers in Different Classes
Abstract : SiC MESFETs and GaN HEMTs have an enormous potential in high-power amplifiers at microwave frequencies due to their wide bandgap features of high electric breakdown field strength, high electron saturation velocity and high operating temperature. The high power density combined with the comparably high impedance attainable by these devices also offers new possibilities for wideband power microwave systems. READ MORE
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20. The Zipper duplex method in very high-speed digital subscriber lines
Abstract : This thesis deals with different aspects of digital subscriber lines (DSL). Over the years several DSL techniques for high-speed communication on the telephone access network have evolved that gradually have allowed higher data rates. READ MORE