Sökning: "hybrid ARQ"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden hybrid ARQ.

  1. 1. Efficient Transmission over Unknown Channels

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

    Författare :Ranjitha Gubbi Suresh; [2020]
    Nyckelord :Multi-Layer Transmission; RBIR; HARQ; mixing layers; successive demodulation; Wi-Fi; Technology and Engineering;

    Sammanfattning : In recent years, digital transmission techniques have been continuously evolving by employing increasingly more advanced Modulation and Coding Scheme (MCS). However, when the wireless channel is varying rapidly, it is hard or even impossible for the transmitter to select the proper MCS. LÄS MER

  3. 2. Error Control in Wireless Sensor Networks : A Process Control Perspective

    Uppsats för yrkesexamina på avancerad nivå, Signaler och System

    Författare :Oskar Eriksson; [2011]
    Nyckelord :wireless sensor networks; process control; hybrid ARQ; forward error correction; FEC; HARQ; adaptive FEC;

    Sammanfattning : The use of wireless technology in the process industry is becoming increasingly important to obtain fast deployment at low cost. However, poor channel quality often leads to retransmissions, which are governed by Automatic Repeat Request (ARQ) schemes. LÄS MER

  4. 3. Scheduling Algorithms and QoS in HSDPA

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Javed Iqbal; Basit Mustafa; [2009]
    Nyckelord :HSDPA; QoS; Scheduling Algorithms;

    Sammanfattning : High Speed Downlink Packet Access (HSDPA) is the extension to the Universal Mobile Telecommunication System (UMTS). HSDPA allows for higher data rates due to new adaptive Modulation and Coding (AMC) techniques, Hybrid Automatic Repeat reQuest (H-ARQ) and fast scheduling algorithm. LÄS MER

  5. 4. Performance Evaluation of TCP Variants over UMTS Networks

    Master-uppsats, Institutionen för informationsteknologi

    Författare :Nikunj Modi; [2008]
    Nyckelord :;

    Sammanfattning : With the evolution of 3G technologies like Universal Mobile TelecommunicationSystem (UMTS), the usage of TCP has become more popular for a reliable end-to-end (e2e) data delivery. However, TCP was initially designed for wired networks and therefore it suffers performance degradation due to the radio signal getting affected by fading, shadowing and interference. LÄS MER

  7. 5. Implementation and simulation of HSDPA functionality with ns-2

    Uppsats för yrkesexamina på grundnivå, Institutionen för systemteknik

    Författare :Haichuan Jianqiu Wu Zhao; [2005]
    Nyckelord :Reglerteknik; UMTS; HSDPA; ns-2; EURANE; HS-DSCH; DCH; Power Consumption; FCDS; Reglerteknik;

    Sammanfattning : Enhanced packet-data access is a trend in third generation mobile communication system. WCDMA Release 5 introduces HSDPA (High Speed Packet Data Access) with a brand new downlink transport channel HS-DSCH (High Speed Downlink Shared Channel) into 3GPP specification to provide greater capacity. LÄS MER