Avancerad sökning

Hittade 5 uppsatser som matchar ovanstående sökkriterier.

  1. 1. Development of new criteria for train detection and evaluation in critical conditions

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

    Författare :Sofiane Kerbal; [2019]
    Nyckelord :railway signaling; train detection; track circuit; shunt; frequency modulation; frequency-shift keying modulation; third-order harmonic; short-time Fourier transform; power spectral density estimation; cross-correlation;

    Sammanfattning : Railway signaling is of paramount importance to ensure traffic management andsafety on the rail network. The main lines are divided into sections called ‘blocks’,which are governed by a fixed signal installation. To prevent trains from colliding,each block allows one train at once. LÄS MER

  3. 2. Modulation schemes in ambient backscatter communication

    Master-uppsats, Uppsala universitet/Institutionen för informationsteknologi

    Författare :Oliver Harms; [2017]
    Nyckelord :;

    Sammanfattning : This thesis presents a study of different modulation schemes in the context of backscatter communication. Backscatter communication is a way of wireless communication where no active signal is transmitted. Instead surrounding signals are modified to transmit data. LÄS MER

  4. 3. Modeling Basic Physical Links in Acumen

    Magister-uppsats, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE)

    Författare :Muzeyen Hassen Esmael; [2012]
    Nyckelord :Acumen; Modulation and Demodulation; Simulation; RC Lowpass filter;

    Sammanfattning : Simulation is the process of computing a behavior determined by a given model of a system of interest.  Modeling is the process of creating a model that formally describes a given class of system.  Modeling and simulation can be used to quickly and cheaply study and understand new technologies. LÄS MER

  5. 4. High Level Ultra Low Power Transmitters for the MICS Standard

    Master-uppsats, Elektroniska komponenter

    Författare :Per Eidenvall; Nils Gran; [2010]
    Nyckelord :Ultra Low Power; MICS; PSK; QPSK; Radio Transmitter; QPSK Modulator;

    Sammanfattning : Today, medical implants such as cardiac pacemakers, neurostimulators, hearing aids anddrug delivery systems are increasinglymore important and frequently used in the health caresystem. This type of devices have historically used inductive coupling as communicationmedium. LÄS MER

  7. 5. Performance Evaluation of M-ary Frequency Shift Keying Radio Modems via Measurements and Simulations

    Magister-uppsats, Blekinge Tekniska Högskola/Avdelningen för telekommunikationssystem

    Författare :Eric Sackey; [2006]
    Nyckelord :Modulation; Frequency shift keying; bandwidth efficiency; Power efficiency; bit-error rate;

    Sammanfattning : M-ary Frequency Shift Keying is a power efficient modulation scheme that is currently used by manufacturers of low power low data rate data transmission equipment. The power efficiency of this modulation increases as the signal alphabet increases at the expense of increased complexity and reduced bandwidth efficiency. LÄS MER