Sökning: "Øien Geir"

Hittade 4 avhandlingar innehållade orden Øien Geir.

  1. 1. Design and Performance of Packet Retransmission Diversity Scheme for Wireless Networks

    Författare :Mikael Gidlund; Geir E Øien; Mittuniversitetet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electronics; Elektronik;

    Sammanfattning : High data-rate wireless access systems are currently under discussion since the demand for wireless multimedia communication is rapidly increasing due to strong advances in wireless Internet services. Reliable high-speed data communications is one of the major challenges with regards to harsh conditions. LÄS MER

  3. 2. Adaptive MIMO Systems with Channel State Information at Transmitter

    Författare :Jinliang Huang; Svante Signell; Øien Geir; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; adaptive modulation; adaptive power allocation; average spectral efficiency; MIMO; BER.; Telecommunication; Telekommunikation;

    Sammanfattning :  This dissertation presents adaptation techniques that can achieve high spectral efficiency for single user multiple-input multiple-output (MIMO) systems. Two types of adaptation techniques, adaptive modulation and adaptive powe allocation, are employed to adapt the rate and the transmit power to fading channels. LÄS MER

  4. 3. 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

  5. 4. Bit-Rate Allocation, Scheduling, and Statistical Multiplexing for Wireless Video Streaming

    Författare :Vladimir Vukadinovic; Gunnar Karlsson; Geir Øien; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cellular systems; wireless; resource allocation; scheduling; Telecommunication; Telekommunikation;

    Sammanfattning : Due to the scarcity of wireless resources, efficient resource allocation is essential to the success of cellular systems. With the proliferation of bandwidth-hungry multimedia applications with diverse traffic characteristics and quality of service requirements, the resource management is becoming particularly challenging. LÄS MER