Sökning: "multi-frequency"

Visar resultat 1 - 5 av 7 uppsatser innehållade ordet multi-frequency.

  1. 1. Design utav kompakt multifrekvent RFID-system

    Kandidat-uppsats, Högskolan i Jönköping/JTH, Datateknik och informatik

    Författare :Daniél Tirosh; [2019]
    Nyckelord :RFID; multi-frequency; reader;

    Sammanfattning : Radio Frequency Identification, RFID, is a wireless identification method which uses electromagnetic fields in order to communicate with electronic tags in the vicinity. In recent years, in conjunction with the digitalization of society, RFID has become a popular method for digital identification. LÄS MER

  3. 2. Multi-Frequency Direction of Arrival Estimation by Low-Rank Approximation

    Master-uppsats, Lunds universitet/Matematik LTH

    Författare :Linus Jangland; [2016]
    Nyckelord :Direction of arrival estimation; Hankel matrices; low rank; optimization; Mathematics and Statistics;

    Sammanfattning : We consider the problem of estimating the location of a number of wave-emitting sources, known as the direction of arrival problem. We consider both the two- and three-dimensional case. The method we use works for equally as well as unequally spaced sensors, that are located in (possibly) non-square regions. LÄS MER

  4. 3. Indoor Positioning Using Opportunistic Multi-Frequency RSS With Foot-Mounted INS

    Master-uppsats, Linköpings universitet/Reglerteknik; Linköpings universitet/Tekniska högskolan

    Författare :Martin Nilsson; [2014]
    Nyckelord :Particle filters; Simultaneous localization and mapping; Radio navigation; Multisensor integration;

    Sammanfattning : Reliable and accurate positioning systems are expected to significantly improve the safety for first responders and enhance their operational efficiency. To be effective, a first responder positioning systemmust provide room level accuracy during extended time periods of indoor operation. LÄS MER

  5. 4. Off-resonance correction for magnetic resonance imaging with spiral trajectories

    M1-uppsats, KTH/Medicinsk teknik

    Författare :Andreas Nylund; [2014]
    Nyckelord :MRI; blur; spiral; inhomogeneity; off-resonance correction.;

    Sammanfattning : The procedure of cardiographic magnetic resonance imaging requires patients to hold their breath for up to twenty seconds, creating an uncomfortable situation for many patients. It is proposed that an acquisition scheme using spiral trajectories is preferable due to their much shorter total scan time; however, spiral trajectories suffer from a blurring effect caused by off-resonance frequencies in the image area. LÄS MER

  7. 5. IP Multicasting over DVB-T/H and eMBMS : Efficient System Spectral Efficiency Schemes for Wireless TV Distributions

    Master-uppsats, Institutionen för informationsteknologi och medier

    Författare :S.M. Hasibur Rahman; [2012]
    Nyckelord :eMBMS; DVB-T; Multicasting; system spectral efficiency;

    Sammanfattning : In today’s DVB-T/H (Digital Video Broadcasting-Terrestrial/Handheld) systems, broadcasting is employed, meaning that TV programs are sent over all transmitters, also where there are no viewers. This is inefficient utilization of spectrum and transmitter equipment. IP multicasting is increasingly used for IP-TV over fixed broadband access. LÄS MER