Sökning: "direct digital modulation"

Hittade 5 uppsatser innehållade orden direct digital modulation.

  1. 1. A Continuous-Time ADC and DSP for Smart Dust

    Master-uppsats, Elektroniksystem; Tekniska högskolan

    Författare :Dhurv Chhetri; Venkata Narasimha Manyam; [2011]
    Nyckelord :smart dust; Event-driven ED ; continuous time CT ; Delta-modulation DM ; segmented register string Digital to analog converter DAC ; digital signal processing DSP ;

    Sammanfattning : Recently, smart dust or wireless sensor networks are gaining more attention.These autonomous, ultra-low power sensor-based electronic devices sense and process burst-type environmental variations and pass the data from one node (mote) to another in an ad-hoc network. LÄS MER

  3. 2. Digital Power Detector for WCDMA Transmitter

    Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Institutionen för reglerteknik

    Författare :Robert Carlzén; Robert Nilsson; [2008]
    Nyckelord :Technology and Engineering;

    Sammanfattning : A 3G mobile phone must have the ability to control its output power with high precision. A power detector is used to measure the actual power outputted by the power amplifier to the antenna. With higher data rates the traditional implementations with peak detectors have become very difficult to use, which is why true RMS detectors are needed. LÄS MER

  4. 3. Direct Digital Pulse Width Modulation for Class D Amplifiers

    Magister-uppsats, Institutionen för systemteknik

    Författare :Stefan Stark; [2007]
    Nyckelord :PWM; Class-D; delay-line; direct digital modulation; delay element;

    Sammanfattning : Class D amplifiers are becoming increasingly popular in audio devices. The strongest reason is the high efficiency which makes it advantageous for portable battery-driven products. Infineon Technologies is developing products in this area, and has recently filed a patent application regarding an implementation of a part of the class D amplifier. LÄS MER

  5. 4. Study Comparison of WCDMA and OFDM

    Magister-uppsats, Blekinge Tekniska Högskola/Avdelningen för telekommunikationssystem

    Författare :Moyamer Chowdhury; Aminul Alam; [2007]
    Nyckelord :TDMA; FDM; CDMA; WCDMA; OFDM;

    Sammanfattning : Wideband Code Division Multiple Access (WCDMA) is one of the main technologies for the implementation of third-generation (3G) cellular systems. It is based on radio access technique proposed by ETSI Alpha group and the specifications was finalised 1999. LÄS MER

  7. 5. Study Comparison of WCDMA and OFDM

    Magister-uppsats, Blekinge Tekniska Högskola/Avdelningen för telekommunikationssystem

    Författare :Moyamer Chowdhury; Aminul Alam; [2007]
    Nyckelord :TDMA; FDM; CDMA; WCDMA; OFDM;

    Sammanfattning : Wideband Code Division Multiple Access (WCDMA) is one of the main technologies for the implementation of third-generation (3G) cellular systems. It is based on radio access technique proposed by ETSI Alpha group and the specifications was finalised 1999. LÄS MER