Sökning: "slow fading"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden slow fading.

  1. 1. Performance Evaluation of 802.15.4 UWB PHY for High Speed Data Rate under IEEE Channel Mode

    Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

    Författare :Athanasios Vasileiadis; [2015]
    Nyckelord :Technology and Engineering;

    Sammanfattning : In modern day society the increase of data generation and transfer has been an issue that researchers are working on. This generated and shared data might have a different purpose but one thing is certain, the reception. This communication can cover continents, countries, cities or even just a few meters. LÄS MER

  3. 2. Implementation Of Wireless Channel Propagation Models In OPNET

    Master-uppsats, Avdelningen för informations- och kommunikationssystem

    Författare :Zhijuan Guo; [2013]
    Nyckelord :OPNET; channel model; power fading; WSN;

    Sammanfattning : In recent times, there has been a significant amount of research regarding the physical layer of wireless communications . The part of the physical layer, which cannot be ignored, is channel propagation. Different environments have different channels. LÄS MER

  4. 3. Methods for Recovery of Missing Speech Packets

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Muhammad Azam; [2011]
    Nyckelord :Slow varying parameters; Short time energy STE ; Zero crossing ZC measure; Modified STE methods; FFT block code method; STZR; STZL; Consecutive speech packets.;

    Sammanfattning : In packetized voice communication, speech packets are sometimes lost due to data transmission problems, e.g., signal fading, or interfering users and noise. For the recovery of missing speech packets, different methods are proposed. LÄS MER

  5. 4. Evaluation of Precoder Designs Using Measured MIMO Channels

    Master-uppsats, KTH/Signalbehandling

    Författare :Ali Alenezi; [2011]
    Nyckelord :;

    Sammanfattning : MIMO transceiver designs rely mainly on the knowledge of channel state information (CSI) at the transmitter and receiver sides of a communication link. In most  practical scenarios due to the fast fading channels, the transmitter side can only have statistical (or long-term) information about the channel. LÄS MER

  7. 5. Performance of Cooperative Relay Protocols over an Audio Channel

    Uppsats för yrkesexamina på avancerad nivå, Kommunikationssystem

    Författare :Thomas Wärme; [2009]
    Nyckelord :Relay; Cooperative transmission; audio channel;

    Sammanfattning : In wireless transmissions the communication is often degraded by random fades, noise and other performance reducing phenomena. One way of improving the stability and reducing the error rates is to use relaying techniques where several nodes cooperate in a transmission between two of them. LÄS MER