Search for dissertations about: "communications"

Showing result 21 - 25 of 964 swedish dissertations containing the word communications.

  1. 21. Algorithms and Proofs of Concept for Massive MIMO Systems

    University dissertation from The Department of Electrical and Information Technology

    Author : Joao Vieira; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; [2017]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; massive MIMO; Algorithms; Testbeds; Deep Learning; Generalized Method of Moments;

    Abstract : This thesis focuses on algorithms and proofs of concepts in the area of wireless systems operating with a large number of antennas, especially at the base station side.The first studied topic concerns the design and implementation of massive multiple-input multiple-output (MIMO) testbeds, primarily for communications. READ MORE

  2. 22. Channel Shortening in Wireless Communication

    University dissertation from Department of Electrical and Information Technology, Lund University

    Author : Sha Hu; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; [2017-12-22]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Channel shortening CS ; multi-input multi-output MIMO ; intersymbol interference ISI ; achievable information rate AIR ; partial marginalization PM ; dirty paper coding DPC ; large intelligent surface LIS ; Cramér-Rao lower bound CRLB ;

    Abstract : The concept of Channel Shortening (CS) is a well-known technique that has a rich history over 40 years. CS transfers linear vector channels such as multi-input multi-output (MIMO) and intersymbol interference (ISI) channels into ``shortened'' versions, for the purpose of reducing demodulation-complexity and improving data-transmission performance. READ MORE

  3. 23. Spatially Coupled Turbo-Like Codes

    University dissertation from Electrical and Information Technology, Lund University

    Author : Saeedeh Moloudi; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; [2018]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : The focus of this thesis is on proposing and analyzing a powerful class of codes on graphs---with trellis constraints---that can simultaneously approach capacity and achieve very low error floor. In particular, we propose the concept of spatial coupling for turbo-like code (SC-TC) ensembles and investigate the impact of coupling on the performance of these codes. READ MORE

  4. 24. Verification of wireless communication performance and robustness for automotive applications

    University dissertation from Elektro- och informationsteknik

    Author : Mikael Nilsson; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; [2018-05-15]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vehicle-to-Vehicle; V2V; channel modeling; path loss; two-ray; obstruction; large scale fading; shadow fading; multiple links; diversity; correlation; over-the-air; OTA; multi-probe; multipath propagation simulator; fading emulation;

    Abstract : Today's test methods used for verifying the performance and robustness of automotive applications using wireless communication are often based on fieldtrails, which are time consuming, costly, and not repeatable. Therefore, there is an urgent need for new verification methods that can be performed in lab environment, where the realistic radio propagation environment can be emulated. READ MORE

  5. 25. Hardware-Conscious Wireless Communication System Design

    University dissertation from Lund University

    Author : Muris Sarajlic; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; [2019-01-28]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy efficiency; communication systems; Signal processing algorithms;

    Abstract : The work at hand is a selection of topics in efficient wireless communication system design, with topics logically divided into two groups.One group can be described as hardware designs conscious of their possibilities and limitations. READ MORE