Essays about: "direct digital modulation"

Found 5 essays containing the words direct digital modulation.

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

    University essay from Elektroniksystem; Tekniska högskolan

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

    Abstract : 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. READ MORE

  3. 2. Digital Power Detector for WCDMA Transmitter

    University essay from Lunds universitet/Institutionen för reglerteknik

    Author : Robert Carlzén; Robert Nilsson; [2008]
    Keywords : Technology and Engineering;

    Abstract : 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. READ MORE

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

    University essay from Institutionen för systemteknik

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

    Abstract : 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. READ MORE

  5. 4. Study Comparison of WCDMA and OFDM

    University essay from Blekinge Tekniska Högskola/Avdelningen för telekommunikationssystem

    Author : Moyamer Chowdhury; Aminul Alam; [2007]
    Keywords : TDMA; FDM; CDMA; WCDMA; OFDM;

    Abstract : 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. READ MORE

  6. 5. Study Comparison of WCDMA and OFDM

    University essay from Blekinge Tekniska Högskola/Avdelningen för telekommunikationssystem

    Author : Moyamer Chowdhury; Aminul Alam; [2007]
    Keywords : TDMA; FDM; CDMA; WCDMA; OFDM;

    Abstract : 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. READ MORE