Search for dissertations about: "Interference Constraints"

Showing result 1 - 5 of 63 swedish dissertations containing the words Interference Constraints.

  2. 1. Performance Analysis of Cognitive Radio Networks with Interference Constraints

    Author : Hung Tran; Blekinge Tekniska Högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cognitive Radio Networks; Spectrum Underlay Access; Interference Constraints; Cognitive Cooperative Radio Networks;

    Abstract : To support the rapidly increasing number of mobile users and mobile multimedia services, and the related demands for bandwidth, wireless communication technology is facing a potentially scarcity of radio spectrum resources. However, spectrum measurement campaigns have shown that the shortage of radio spectrum is due to inefficient usage and inflexible spectrum allocation policies. READ MORE

  4. 2. Single-User Receivers for Partly Known Interference in Multi-User Environments

    Author : Bo Hagerman; Jens Zander; KTH; []
    Keywords : 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;

    Abstract : 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. READ MORE

  5. 3. On the Performance of Underlay Cognitive Radio Networks with Interference Constraints and Relaying

    Author : Charles Kabiri; Blekinge Tekniska Högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cognitive Radio Networks; Cognitive Cooperative Relay Networks; Underlay Spectrum Access; Interference Constraint; Outage Constraint;

    Abstract : Efficiently allocating the scarce and expensive radio resources is a key challenge for advanced radio communication systems. To this end, cognitive radio (CR) has emerged as a promising solution which can offer considerable improvements in spectrum utilization. READ MORE

  6. 4. Interference Alignment with Imperfect Channel Knowledge and Secrecy Constraints

    Author : Zhao Wang; Mikael Skoglund; Ming Xiao; Sheng Yang; KTH; []
    Keywords : Informations- och kommunikationsteknik; Information and Communication Technology;

    Abstract : In this thesis, the degrees of freedom (DOF) of wireless networks are studied with imperfect channel state information at transmitters (CSIT) and/or secrecy constraints. Different interference alignment schemes are proposed to establish the DOF lower bound for a variety of wireless networks. READ MORE

  7. 5. Age and Constraints on Language Learning : First Language Retention and Second Language Acquisition in International Adoptees

    Author : Gunnar Norrman; Emanuel Bylund Spångberg; Guillaume Thierry; Janet Werker; Stockholms universitet; []
    Keywords : HUMANIORA; HUMANITIES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; bilingualism; critical period; electroencephalography; event-related potentials; first language retention; international adoption; phonology; second language acquisition; Bilingualism; tvåspråkighet;

    Abstract : This thesis investigates the influence of age of acquisition on the long-term second language development of international adoptees. Because age of acquisition typically coincides with the onset of bilingualism, the study of maturational age effects in second language acquisition has been empirically and conceptually entangled with changes in language input and use. READ MORE