Search for dissertations about: "code-division-multiple-access CDMA"

Showing result 1 - 5 of 19 swedish dissertations containing the words code-division-multiple-access CDMA.

  1. 1. Diversity and Interference Aspects in the Downlink of Code Division Multiple Access Systems

    Author : Anders Persson; [2004]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; orthogonal frequency division multiplexing; multi-carrier modulation; Rayleigh-fading channels; code division multiple access; frequency-selective channels; multiple access interference; diversity;

    Abstract : This thesis consists of six included papers and technical reports, plus an introduction. The topic studied is interference and diversity aspects in code division multiple access (CDMA) systems for mobile cellular communications. The focus in the papers is on the downlink - the communication link from the base station to the mobile terminal. READ MORE

  2. 2. Coding and Modulation for Wideband CDMA

    University dissertation from Ola Wintzell, Dept. of Information Technology, Lund University, PO Box 118, SE-221 00 Lund, Sweden

    Author : Ola Wintzell; Lunds universitet.; Lund University.; [2002]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; turbo codes.; Electronics and Electrical technology; channel coding; impulse radio; coordinated transmission; pre-coding; cellular radio capacity; Direct sequence code division multiple access DS-CDMA ; pulse position hopped code division multiple access PPH-CDMA ; Elektronik och elektroteknik; Telecommunication engineering; Telekommunikationsteknik;

    Abstract : Popular Abstract in Swedish Ett system där flera personer och maskiner kan kommunicera samtidigt över ett gemensam medium kallas ett fleranvändarsystem. Den här avhandlingen presenterar och analyserar olika fleranvändarsystem där mediet består av en radiokanal med hög bandbredd. READ MORE

  3. 3. Uplink Load in CDMA Cellular Systems

    University dissertation from Linköping : Linköping University

    Author : Erik Geijer Lundin; Linköpings universitet.; Linköpings universitet.; [2003]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Code Division Multiple Access;

    Abstract : Cellular mobile systems designed to handle multimedia services are currently being developed. The primary goal for any mobile system is to provide a satisfactory quality of service, both to operators and customers. Providing good quality of service while maintaining system stability requires accurate knowledge of the system load. READ MORE

  4. 4. Simplified Graphical Approaches for CDMA Multi-User Detection, Decoding and Power Control

    University dissertation from Linköping : Linköping University

    Author : Peng Hui Tan; [2005]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; code-division multiple access; belief propagation; large system analysis; iterative decoding; multiuser detection; power control;

    Abstract : The individual optimal detector for code-division multiple-access (CDMA) systems is based on the marginal a posteriori distribution of the transmitted bits. The marginalization is in general hard since a summation is required, which grows exponentially in scope with the number of active users. READ MORE

  5. 5. Coding for multiple-access and fading channels

    University dissertation from Department of Information Technology, Lund Univeristy

    Author : Leif Wilhelmsson; Lunds universitet.; Lund University.; [1998]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Systems engineering; Gilbert-Elliott channel model; Imperfect interleaving; Fading; Error correcting codes; Pre-coding; Channel capacity; Direct-sequence code-division multiple-access DS-CDMA ; Frequency-hopped code-division multiple-access FH-CDMA ; computer technology; Data- och systemvetenskap; Telecommunication engineering; Telekommunikationsteknik;

    Abstract : This thesis treats some information-theoretical and coding aspects of communication over multiple-access and fading channels. It consists of a general introduction and seven papers. In code-division multiple-access (CDMA) communication, many users have access to the channel simultaneously. READ MORE