Sökning: "mixed modulation"

Visar resultat 1 - 5 av 39 avhandlingar innehållade orden mixed modulation.

  1. 1. Interference Cancellation for DS/CDMA Systems in Flat Fading Channels

    Författare :Ann-Louise Johansson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mixed modulation; direct-sequence code division multiple access DS CDMA ; multiuser detection.; multiple data rates; parallel channels; multicode; interference cancellation;

    Sammanfattning : This thesis investigates interference cancellation in direct-sequence codedivision multiple access (DS/CDMA) systems that support multiple data rates.Two approaches for implementing multiple data rates are considered. Oneis the use of mixed modulation. The second is the use of parallel channels. LÄS MER

  3. 2. Immune modulation by mesenchymal stem cells

    Författare :Ida Rasmusson; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Mesenchymal stem cells; T cells; cytotoxic T lymphocytes; cytokines; mixed lymphocyte culture; B cells; antibody production; stem cell transplantation; acute graft versus host disease;

    Sammanfattning : Mesenchymal stem cells (MSCs) were discovered as adherent cells in the bone marrow stroma that could form bone and stimulate hematopoiesis. Later, MSCs were shown to be hypoimmunogenic and to suppress proliferation of activated T cells. LÄS MER

  4. 3. Self-Homodyne Coherent Systems using Advanced Modulation Formats

    Författare :Martin E Sjödin; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Modulation formats that offer high spectral efficiency will be of great importance in future fiber optic communication systems. Currently, a lot of research effortsare ongoing to investigate the best ways of generating and detecting modulation formats in which both the phase and the amplitude of the light are used to carry information, such as 16-QAM. LÄS MER

  5. 4. Immune modulation in chronic HBV and HCV infection

    Författare :Catharina Hultgren; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :HBV; HBeAg; HCV; NS3; chronic infection; humoral cellular immune response; Th1 Th2 cells; proliferative response;

    Sammanfattning : Chronic viral hepatitis is a major health problem worldwide. The two major viral causes for chronic hepatitis are the hepatitis B (HBV) and C viruses (HCV). HBV is a DNA virus with a rather limited genetic variability whereas HCV is an RNA virus with a high genetic variability. LÄS MER

  7. 5. Stimuli Generation Techniques for On-Chip Mixed-Signal Test

    Författare :Shakeel Ahmad; Jerzy Dabrowski; Torkel Arnborg; Linköpings universitet; []
    Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : With increased complexity of the contemporary very large integrated circuits the need for onchip test addressing not only the digital but also analog and mixed-signal RF blocks has emerged. The standard production test has become more costly and the instrumentation is pushed to its limits by the leading edge integrated circuit technologies. LÄS MER