Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 70 for “"Modulation techniques"”.
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Modulation techniques for GPR system radargram
… Asynchronous Real Square Law (ARSL). The Pulse Modulation (PM), Stepped Frequency Continuous Wave (SFCW) and Hybrid GPR system simulation are modeled using CST Studio Suite and MATLAB software. The selected fractional bandwidth of the GPR system simulation modeled is 0.46 and 0.4 for Microstrip …
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Variable-Angle Modulation Techniques for Modular Power Converters
El trabajo desarrollado y que se presenta en este documento es el resultado de la investigación desarrollada como parte del grupo de electrónica de potencia en la Universidad de Sevilla durante los últimos tres años. Dicha investigación se enmarca en el campo de los convertidores de potencia …
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Modulation techniques for data superposition on amplitude-modulated signals
Double-sideband amplitude-modulation is widely used because of its simplicity in transmission and reception, but in a number of applications the inclusion of a data channel has become an additional requirement. An additional data signal, transmitted with a normal AM broadcast signal, can be used by …
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Delta modulation techniques for low bit-rate digital speech encoding
Two new hybrid companding delta modulators for speech encoding are presented here. These modulators differ from the Hybrid Companding Delta Modulator (HCDM) proposed by Un et al in that the two new encoders employ Song Voice Adaptation as the basis of the instantaneous compandor, rather than …
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Design and Analysis of Pulse -Width Modulation Techniques for Spectrum Shaping
… spectrum and then to realize it using a proper modulation scheme. The results of Pd-PWM and FM-PWM bring us one step closer to understanding how to meet this goal.
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Investigation of the pulse time modulation techniques for transmission of wideband signals
The choice of the modulation format is the principle factor in realising a highperformance bandwidth efficient communication system at an acceptable cost and complexity. Pulse time modulation technique represents an attractive alternative to purely digital or purely analogue modulation schemes …
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High-resolution Digital Pulse width Modulation Techniques for Digitally Controlled Power Supplies
L'abstract è presente nell'allegato / the abstract is in the attachment
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eStudy of BER Performance in Passive Optical Networks with Different Modulation Techniques
… wired and wireless communication systems. The modulation of RF signals has been tried by using different types in order to study the BER performance when PON is used. Three different optical millimeter signals were analyzed, which are Single Side-Band (SSB), Double Side-Band (DSB), and Optical …
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Amplitude and phase modulation techniques for an asymmetric multi-level outphasing transmitter
New techniques for improving outphasing transmitters show potential of breaking the traditional linearity-efficiency trade-off by using highly efficient non-linear switching Power Amplifiers (PAs). This work focuses on two of the main building blocks of modem outphasing systems, the power supply …
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Performance Analysis of Space-Time Coded Modulation Techniques using GBSB-MIMO Channel Models
… the principles of Multilayered Space-Time Coded Modulation to combine the benefits of BLAST and STBC are introduced and their performance is investigated in correlated and uncorrelated Rayleigh fading. Results indicate that schemes using orthogonal design space-time block codes are reasonably …
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Development of pulse-width-modulation techniques for multi-phase and multi-leg voltage source inverters
… source inverter (VSI). Various pulse width modulation (PWM) schemes have been developed for multi-phase machines with concentrated and distributed windings, utilising both carrier-based PWM and space vector PWM (SVPWM) approaches. However, no systematic analysis has been performed in order …
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Design and development of exclusive modulation techniques for effective power regulation in dual two-level-inverter-fed open-ended winding traction motors
… regulated. In first work, a simple carrier-based modulation (CBM) technique for sharing and controlling the power flow between isolated DC sources in a dual two-level inverter has been proposed . The proposed technique is extensively studied for different steady state and dynamic conditions. The …
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A Pseudo-Binary Cascaded H-bridge Converter for Solid-State Transformer Applications and Modulation Techniques for the Minimization of the Common-Mode Voltage
… of the proposed front-end SST with the proposed modulation and control technique is verified in a 1.2 kV/3 kW single-phase prototype, where each module was able to transfer 1kW each. Electromagnetic interference (EMI) also impacts the cost, size, and reliability of three-phase systems because …
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Adaptive Coded Modulation Classification and Spectrum Sensing for Cognitive Radio Systems. Adaptive Coded Modulation Techniques for Cognitive Radio Using Kalman Filter and Interacting Multiple Model Methods
… (WiMAX) platforms, where robust coding and modulations are essential especially in streaming on-line video material, social media and gaming. This eventually resulted in extreme exhaustion imposed on the frequency spectrum as a rare natural resource due to stagnation in current spectrum …
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Space Vector Pwm Techniques for Six_Phase Three-Level Inverter-Fed Drives
… of phases. This thesis presents pulse width modulation techniques for two- and three-level asymmetrical and symmetrical six-phase drives with a single or two isolated neutral points configuration. However, since the modulation techniques for the drives with two isolated neutral points are …
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Optical communication through the turbulent atmosphere with transmitter and receiver diversity, wavefront control, and coherent detection
… analyze several different optical field spatial modulation techniques, each of which is based on a different assumption about the quality of turbulence state information at the transmitter. For example, we explore a diversity optical system with perfect turbulence state information at the …
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Efficiency Enhancement of Base Station Power Amplifiers Using Doherty Technique
… spectrum usage. This requires sophisticated modulation techniques, leading to wide, dynamic signals that require linear amplification. Although linear amplification is achievable, it always comes at the expense of efficiency. Most of the modern wireless applications such as WCDMA use …
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Design and Analysis of OFDM System for Powerline Based Communication
… environments. Coupled with advances in new modulation techniques, Orthogonal Frequency Division Multiplexing (OFDM) is a well-known digital multicarrier communication technique and one of the best methods of digital data transmission over a limited bandwidth. The main aim of this research is …
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