Sökning: "ANTENNA-ARRAYS"

Visar resultat 1 - 5 av 56 avhandlingar innehållade ordet ANTENNA-ARRAYS.

  1. 1. 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. 2. Spatial diversity receivers for base station antenna arrays

    Författare :Per Pelin; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; synchronization; data reduction; spatial diversity; antenna array; finite alphabet; multi-user; iterative least squares; RAKE-combiner; reciever; base station;

    Sammanfattning : .... LÄS MER

  4. 3. Spatial models for narrowband signal estimation with antenna arrays

    Författare :David Asztély; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  5. 4. Next Generation Wideband Antenna Arrays for Communications and Radio Astrophysics

    Författare :Christos Kolitsidas; Lars Jonsson; Christophe Craeye; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; array figure of merit; fundamental limits; wideband array; wide scan-angle array; strongly coupled asymmetric dipole array; periodic loading; soft Vivaldi array; 21cm Cosmology; Epoch of Reionization; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : Wideband, wide-scan antenna arrays are a promising candidate for the future wireless networks and as well as an essential part of experimental radio astrophysics. Understanding the underline physics of the element performance in the array environment is paramount to develop and improve the performance of array systems. LÄS MER

  7. 5. Ultra-wideband Millimeter-wave Antenna Arrays and Front-end Systems : For high data rate 5G and high energy physics applications

    Författare :Imran Aziz; Dragos Dancila; Ville Viikari; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The demand for wireless data communications is rapidly increasing due to several factors including increased internet access, increasingly growing number of mobile users and services, implementation of the Internet of Things (IoT), high-definition (HD) video streaming and video calling. To meet the bandwidth requirement of new and emerging applications, it is necessary to move from the existing microwave bands towards millimeter-wave bands. LÄS MER