Sökning: "parallel channels"

Visar resultat 1 - 5 av 83 avhandlingar innehållade orden parallel channels.

  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. Quantized Feedback for Slow Fading Channels

    Författare :Thanh Tùng Kim; Mikael Skoglund; Geir Øien; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fading channels; information rates; feedback communications; diversity methods; MIMO systems; power control; adaptive systems; quantization.; Telecommunication; Telekommunikation;

    Sammanfattning : Two topics in fading channels with a strict delay constraint and a resolution-constrained feedback link are treated in this thesis. First, a multi-layer variable-rate single-antenna communication system with quantized feedback, where the expected rate is chosen as the performance measure, is studied under both short-term and long-term power constraints. LÄS MER

  4. 3. Structural transitions of proton-gated ion channels : Involving pH sensing, heterogeneity and lipid interactions

    Författare :Urška Rovšnik; Erik Lindahl; Hugues Nury; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; ion channels; cryo-electron microscopy; pH gating; simulations; structure-function relationship; GLIC; DeCLIC; biokemi; Biochemistry;

    Sammanfattning : Studying protein structure and function involves analyzing the relationship between a protein's three-dimensional assembly and its dynamic biochemical activity. The superfamily of pentameric ligand-gated ion channels (pLGICs) constitutes a classic yet illuminating experimental system for structure-function studies. LÄS MER

  5. 4. MIMO Channels - Measurements and Analysis

    Författare :Peter Almers; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Telecommunication engineering; Telekommunikationsteknik; Electrical engineering; Elektroteknik; Signal processing; Teknik; Capacity; Technological sciences; Spatial-multiplexing; Diversity; Measurements; MIMO; Wireless; Communications;

    Sammanfattning : Providing increased transmission speed, quality and an efficient spectrum utilization is crucial for high speed wireless services of today and the future. This thesis is a collection of papers that address an important step in that direction -- the utilization of the spatial domain of the wireless channel. LÄS MER

  7. 5. Limited Feedback Information in Wireless Communications : Transmission Schemes and Performance Bounds

    Författare :Thanh Tùng Kim; Mikael Skoglund; Hesham El Gamal; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Diversity-multiplexing tradeoff; Large deviation analysis; Limited feedback; MIMO channels; Relay channels; Telecommunication; Telekommunikation;

    Sammanfattning : This thesis studies some fundamental aspects of wireless systems with partial channel state information at the transmitter (CSIT), with a special emphasis on the high signal-to-noise ratio (SNR) regime. The first contribution is a study on multi-layer variable-rate communication systems with quantized feedback, where the expected rate is chosen as the performance measure. LÄS MER