Sökning: "non-linear distortion"

Visar resultat 1 - 5 av 23 avhandlingar innehållade orden non-linear distortion.

1. 1. Multi-Gigabaud Solutions for Millimeter-wave Communication

   Författare :Sining An; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Millimeter-wave communication; power amplifier; mobile network; power combining; outphasing; high order modulation; DQPSK; modem; pilot; 16-QAM; non-linear distortion; E-band; high data rate; carrier recovery;

   Sammanfattning : With the growing number of mobile network and internet services subscriptions, faster communication will provide a better experience for users. In the next generation mobile network, the fifth generation (5G), communication data rate will achieve several Gigabits per second with ultra-low latency. LÄS MER

3. 2. Three-Dimensional Load-Deformation Relationships of Arbitrarily Loaded Coiled Springs

   Författare :Lars Lindkvist; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; extended stiffness model; helical spring; non-linear deformation; stiffness matrix; coiled spring; arbitrary load; large deformation; three-dimensional;

   Sammanfattning : This paper reports the development of a computer based tool that can be used to predict the three-dimensional load-deformation relationships of arbitrarily loaded coiled springs. The non-linear deformation of the spring is calculated by dividing the spring into small elements for which the load-deformation relationships can be considered to be linear. LÄS MER

4. 3. Optimization of LDMOS Transistor in Power Amplifiers for Communication Systems

   Författare :Ahsan-Ullah Kashif; Qamar-ul Wahab; Christer Svensson; Joachim Wurfl; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; RF-LDMOS; power amplifiers; technology CAD; load-pull; non-linear analysis; and switching analysis; Semiconductor physics; Halvledarfysik;

   Sammanfattning : The emergence of new communication standards has put a key challenge for semiconductor industry to develop RF devices that can handle high power and high data rates simultaneously. The RF devices play a key role in the design of power amplifiers (PAs), which is considered as a heart of base-station. LÄS MER

5. 4. On MIMO Systems and Adaptive Arrays for Wireless Communication : Analysis and Practical Aspects

   Författare :Mattias Wennström; Michael A. Jensen; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Systemteknik; antenna array; calibration; MIMO system; flat fading; non-linear amplifier; switched parasitic antenna; analog beamformer; adaptive antenna testbed; Systemteknik; Systems engineering; Systemteknik; Signal Processing; signalbehandling;

   Sammanfattning : This thesis is concerned with the use of multiple antenna elements in wireless communication over frequency non-selective radio channels. Both measurement results and theoretical analysis are presented. New transmit strategies are derived and compared to existing transmit strategies, such as beamforming and space-time block coding (STBC). LÄS MER

7. 5. Application of Differential Geometry to Elasticity and Corresponding Discrete Models

   Författare :Nina Lautersztajn-S.; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mechanical systems; differential geometry; isoparametric four-node elements; Lie groups; non-linear elasticity; elasticity; finite element method;

   Sammanfattning : The amazing development in technology and industry during the last half of the twentieth century has opened totally new research fields. One of them is computational mechanics. Suddenly very complex, three-dimensional nonlinear engineering problems could be solved as a consequence of explosive advances in computers and numerical schemes. LÄS MER