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Visar resultat 1 - 5 av 51 uppsatser som matchar ovanstående sökkriterier.

  1. 1. Characterisation and Modeling of RF environment

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Signaler och system

    Författare :Patric Beas Petersson; [2022]
    Nyckelord :signal processing; passive radar; antenna array; data processing; signalbehandling; passiv radar; antennarray; databehandling;

    Sammanfattning : Devices that transmit and receive electromagnetic signals are today central to the way people communicate and acquire information from the surroundings. WiDAR, Wideband Digital Array Receiver, is the name of a new system of digital antenna array receivers, which has recently been developed at Saab in Järfälla and is the focus of this thesis. LÄS MER

  3. 2. Closing of 3G Sites : Model for Decision Making

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Emmanuel Chaudron; [2018]
    Nyckelord :Mobile telephony; Base station BS ; 3G sunset; UMTS; Business data processing; Economic feasibility analysis; Techno-economic study; Mobiltelefoni; Basstation; 3G sunset; UMTS; Företagsdatabehandling; Ekonomisk genomförbarhetsanalys; Tekno-ekonomisk studie;

    Sammanfattning : Radio access technologies evolving fast, mobile operators have to handle an increasing amount of base stations and frequency bands for their network to continue to function. This is a costly venture for mobile network operators that continuously have to keep up to date with never-ending advancements in technologies, as base stations are costly to build and to maintain. LÄS MER

  4. 3. Emulating 3G Network Characteristics on WiFi Networks

    Master-uppsats, Linköpings universitet/Programvara och system

    Författare :Alexander Alesand; [2015]
    Nyckelord :Emulation; Network Emulation; Network Testing; Software Testing; Testing; UMTS; 3G; Spotify; Emulering; Nätverksemulering; Nätverkstestning; Mjukvarutestning; Testning; 3G; UMTS; Spotify;

    Sammanfattning : Mobile applications should work regardless of which type of wireless interface is used, and should be able to conceal unstable connections from the user to improve user experience. Therefore, network testing is important when developing mobile applications, but it is a challenge to reproduce network conditions when using real cellular networks since the test engineer has no control over the quality of the cellular network. LÄS MER

  5. 4. 4G LTE : eMBMS with MBSFN Service Simulation using OPNET

    Kandidat-uppsats, Mittuniversitetet/Avdelningen för informations- och kommunikationssystem

    Författare :Abdelrahman Walid; [2014]
    Nyckelord :3G; 3GPP; 4G; CoMP; CSI; CSI-IM; CSI-RS; eMBMS; eNB; EPC; EPS; E-UTRAN; GSM; HSPA; IGMP; IGRP; ITU-T; LTE; LTE-A; MAC; MBSC; MBSFN; MCE; MCS; MFN; MME; OFDM; OFDMA; OPNET; OSPF; PDN-GW; PDSCH; PMCH; PUCCH; PUSCH; QoS; SAE; SC-FDMA; S-GW; TDD; TD-SCMDA; UE; UTMS; WCDMA.;

    Sammanfattning : Long Term Evolution (LTE) known in the market as 4G LTE, it is an evolution of the GSM/UMTS standard. The overall aim of LTE was to provide a new radio access technology focusing on packet-switched data only. LTE has provided a new peak download rates, low data transfer latencies, and improved the support for mobility. LÄS MER

  7. 5. Energy-Efficient Vertical Handovers

    Master-uppsats, KTH/Kommunikationssystem, CoS

    Författare :José María Rodríguez Castillo; [2013]
    Nyckelord :Vertical Handover; Offload; LTE; 4G; WLAN; Wi-Fi; Energy consumption; Energy savings; Energy-efficient; Handover; IEEE 802.11; Vertikal Handover; Avlastning; LTE; 4G; WLAN; Wi-Fi; Energiförbrukning; Energibesparingar; Energieffektiv; IEEE 802.11; Smartphone; Batteriets livslängd;

    Sammanfattning : Recent studies have shown that there are currently more than 1.08 billion of Smartphones in the world, with around 89% of them used throughout the day. On average each of these users transfers more than 450 Mbytes per month via either a cellular network or a Wi-Fi network. LÄS MER