Sökning: "frequency-hopping"

Visar resultat 1 - 5 av 16 uppsatser innehållade ordet frequency-hopping.

  1. 1. Stöldskydd i Jordbruket

    Kandidat-uppsats, Linköpings universitet/Institutionen för systemteknik

    Författare :Fabian Coops; Grins Adam; [2023]
    Nyckelord :Elektroteknik; Stöld; LoRaWAN;

    Sammanfattning : This report examines and presents an effective way to alert the owner of a GPS device in case of theft in the agricultural sector. By implementing IR sensors that can be mounted under the object and monitor movements, the owner can receive a warning via SMS and email in case of a potential theft. LÄS MER

  3. 2. LPI waveforms for AESA radar

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Fasta tillståndets elektronik

    Författare :Andreas Sjöberg; [2020]
    Nyckelord :Radar LPI waveform AESA;

    Sammanfattning : The purpose of low probability of intercept (LPI) radar is, on top of the standard requirements on a radar, to remain undetected by hostile electronic warfare (EW) systems. This can be achieved primarily by reducing the amount of radiated power in any given direction at all times and is done by transmitting longer modulated pulses that can then be compressed digitally in order to retain range resolution. LÄS MER

  4. 3. The Impact of Antennas on Radiolink Performance in Frequency Hopping Scenarios

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

    Författare :Sofia Bergström; [2018]
    Nyckelord :;

    Sammanfattning : This paper investigates how the communication performance of frequency hopping systems are affected by the antenna parameters. The data are generated from Antenna Toolbox in Matlab for the case of two dipole antennas is free space. LÄS MER

  5. 4. Cell Acquisition and Synchronization for Unlicensed NB-IoT

    Master-uppsats, Linköpings universitet/Kommunikationssystem

    Författare :Eskil Jörgensen; [2017]
    Nyckelord :Narrowband Internet-of-Things; NB-IoT; unlicensed; cell search; cell acquisition; synchronization; artificial fast fading; binary sequences; peak sidelobe level;

    Sammanfattning : Narrowband Internet-of-Things (NB-IoT) is a new wireless technology designed to support cellular networks with wide coverage for a massive number of very cheap low power user devices. Studies have been initiated for deployment of NB-IoT in unlicensed frequency bands, some of which demand the use of a frequency-hopping scheme with a short channel dwell time. LÄS MER

  7. 5. Comparison of link layer of BLE and 802.15.4 : Running on Contiki OS

    Master-uppsats, KTH/Skolan för informations- och kommunikationsteknik (ICT)

    Författare :Prithviraj Narendra; [2014]
    Nyckelord :;

    Sammanfattning : There has been extensive research in the low power Wireless Sensor Network (WSN) community with 802.15.4 based platforms. A major factor for this is the support for 802. LÄS MER