Sökning: "pulse amplitude modulation"

Visar resultat 16 - 20 av 29 avhandlingar innehållade orden pulse amplitude modulation.

  1. 16. On Linear Transmission Systems

    Författare :Dzevdan Kapetanovic; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MIMO systems; Precoding; Information Theory; Single Carrier Systems; Linear Modulation; Faster-than-Nyquist Signaling.;

    Sammanfattning : This thesis is divided into two parts. Part I analyzes the information rate of single antenna, single carrier linear modulation systems. The information rate of a system is the maximum number of bits that can be transmitted during a channel usage, and is achieved by Gaussian symbols. LÄS MER

  3. 17. Modelling depression in animals and the potential antidepressant effect of histaminergic modulation

    Författare :Salvatore Magara; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Depression is at the top position for "years lived with disability" (Smith, 2014). Its aetiology is unknown, but the pathogenesis implicates changes in glutamatergic neuronal plasticity. Glutamatergic plasticity likely mediates the effects of antidepressants acting through monoamines. LÄS MER

  4. 18. Afferent input to midbrain dopamine neurones and its modulation : an electrophysiological study i vitro

    Författare :Pernilla Grillner; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :dopamine neurones; synaptic transmission; NMDA receptors; L-type Ca2 channels; presynaptic inhibition; metabotropic glutamate receptors; muscarine; nicotine;

    Sammanfattning : Dopamine (DA) neurones of the ventral mesencephalon are involved in the control of reward related behaviour, cognitive functions and motor performances, and provide a critical site of action for major categories of neuropsychiatric drugs, such as antipsychotic agents, dependence producing drugs and anti-Parkinson medication. The midbrain DA neurones are mainly located in the substantia nigra pars compacta (SNPC) and the ventral tegmental area (VTA). LÄS MER

  5. 19. Longer Wavelength GaAs-Based VCSELs for Extended-Reach Optical Interconnects

    Författare :Ewa Simpanen; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vertical-cavity surface-emitting laser; high-speed modulation; reach; chromatic dispersion; single-mode; multi-mode; attenuation; optical interconnect;

    Sammanfattning : Data centers of today are increasing in size and are built to accommodate strong traffic demands while providing sustainably by having clients sharing resources under one roof. Their massive scale puts pressure on the server network topology and has incited a need for data transmission links that are energy efficient and capable of operation at high bit rates with reach up to a few kilometers. LÄS MER

  7. 20. Phase-Sensitive Parametric Signal Processing in Optical Communications

    Författare :Abel Lorences Riesgo; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This thesis covers the analysis of several schemes for parametric processing in fiberoptic communication systems, focusing mainly on phase-sensitive processing. Vector phase-sensitive amplifiers are characterized and phase regeneration of a dualpolarization (DP)-binary phase-shift keying signal (BPSK) signal is experimentally demonstrated. LÄS MER