Sökning: "outage capacity"

Visar resultat 11 - 15 av 27 avhandlingar innehållade orden outage capacity.

  1. 11. Mobile cellular communications with base station antenna arrays

    Författare :Per Zetterberg; KTH; []
    Nyckelord :;

    Sammanfattning : This thesis deals with the problem of increasing thespectrum efflciency of cellular systems by the use of antennaarray base stations. The focus of the thesis is on downlinktransmission in frequency division duplex systems. i.e. LÄS MER

  3. 12. Single-User Receivers for Partly Known Interference in Multi-User Environments

    Författare :Bo Hagerman; Jens Zander; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cellular systems; mobile radio systems; co-channel interference; inter-cell interference; interference adaptive receiver; macrocells; microcells; Information technology; Informationsteknik; SRA - ICT; SRA - Informations- och kommunikationsteknik;

    Sammanfattning : In multiuser environments such as cellular radio systems, the limited available bandwidth is one of the principal design constraints. For future high subscriber density systems, frequency reuse is one of the fundamental approaches for efficient spectrum utilization in order to meet the increased demands for capacity. LÄS MER

  4. 13. Performance Analysis of Cognitive Radio Networks under Spectrum Sharing and Security Constraints

    Författare :Louis Sibomana; Zepernick Hans-Jürgen; Slimane Ben Slimane; Blekinge Tekniska Högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Underlay cognitive radio networks; spectrum sharing constraints; physical layer security;

    Sammanfattning : The cognitive radio network (CRN) concept has been proposed as a solution to the growing demand and underutilization of the radio spectrum. To improve the radio spectrum utilization, CRN technology allows the coexistence of licensed and unlicensed systems over the same spectrum. LÄS MER

  5. 14. Scheduling and Base-Station Cooperation in MIMO Downlink Systems

    Författare :Nima Seifi; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Multiple input multiple output (MIMO) techniques have been shown to improvethe capacity and link reliability of wireless communication without a need to extrapower and bandwidth. In multi-user (MU) MIMO networks, a linear increaseof sum capacity in the number of transmit antennas can be achieved by usinglinear precoding combined with efficient scheduling algorithms. LÄS MER

  7. 15. On Reliability Methods Quantifying Risks to Transfer Capability in Electric Power Transmission Systems

    Författare :Johan Setréus; Lina Bertling; Roland Eriksson; Stefan Arnborg; Lars Wredenberg; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Power transmission reliability; power system security; reliability modeling; risk analysis for power systems; power system planning; Electric power engineering; Elkraftteknik;

    Sammanfattning : In the operation, planning and design of the transmission system it is of greatest concern to quantify the reliability security margin to unwanted conditions. The deterministic N-1 criterion has traditionally provided this security margin to reduce the consequences of severe conditions such as widespread blackouts. LÄS MER