Sökning: "multichannel systems"

Visar resultat 1 - 5 av 21 avhandlingar innehållade orden multichannel systems.

  1. 1. Multicarrier Modulation and Coding for Multichannel Systems

    Författare :Pål Frenger; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; multi-code DS-CDMA.; Decision directed coherent detection; RCPC-codes; Parallel combinatory signaling; rate matching; OFDM; multichannel systems; Channel estimation; Multicarrier modulation;

    Sammanfattning : In this thesis decision directed coherent detectors for single- and multicarriersystems employing an MMSE channel estimation technique is presented. Thedetectors are designed for Rayleigh fading channels and DQPSK or p/4-DQPSKmodulation and exploit knowledge of the fading process correlation. LÄS MER

  3. 2. Selfish Dynamic Spectrum Access in Multichannel Wireless Networks : Complete and incomplete information analysis

    Författare :Ali Özyagci; Jens Zander; Alexandre Proutiere; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Game theory; Multichannel random access; Bayesian game; Nash equilibrium Heterogeneous channels; SRA - ICT; SRA - Informations- och kommunikationsteknik;

    Sammanfattning : The increasing popularity and widespread deployment of wireless data systems fuel the increasing demand for more spectrum. On the other hand, various studies measuring spectrum utilization show that there is a huge variation in spectrum utilization at different times and locations. LÄS MER

  4. 3. Speech Signal Extraction : A Multichannel Approach

    Författare :Nedelko Grbic; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Speech Enhancement; Blind signal separation; Echo control; Adaptive systems;

    Sammanfattning : In speech signal extraction the aim is to extract human speech in a physical environment by using microphones. In any real world environment there are many disturbance sources that cause unwanted sound pressure, which in turn may degrade the comprehension of the speech at the microphones. LÄS MER

  5. 4. Compensation of Laser Phase Noise Using DSP in Multichannel Fiber-Optic Communications

    Författare :Arni Alfredsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; multichannel transmission; rotations; digital signal processing; laser phase noise; Coherent fiber-optic communications; detection; estimation;

    Sammanfattning : One of the main impairments that limit the throughput of fiber-optic communication systems is laser phase noise, where the phase of the laser output drifts with time. This impairment can be highly correlated across channels that share lasers in multichannel fiber-optic systems based on, e.g. LÄS MER

  7. 5. Structured interface suppression in multichannel systems

    Författare :Göran Klang; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER