Sökning: "code-division multiple-access CDMA"

Visar resultat 1 - 5 av 32 avhandlingar innehållade orden code-division multiple-access CDMA.

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

    Författare :Anders Persson; Chalmers University of Technology; []
    Nyckelord :orthogonal frequency division multiplexing; multi-carrier modulation; Rayleigh-fading channels; code division multiple access; frequency-selective channels; multiple access interference; diversity;

    Sammanfattning : 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. LÄS MER

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

    Författare :Leif Wilhelmsson; Institutionen för elektro- och informationsteknik; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  3. 3. Joint ML multi user detection of block coded CDMA over the AWGN channel using A*

    Författare :Peter Németh; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; CDMA; heuristic function; complexity reduction; priority-first algorithms; A*; code division multiple access; linear block codes;

    Sammanfattning : .... LÄS MER

  4. 4. Coding and Modulation for Wideband CDMA

    Författare :Ola Wintzell; Institutionen för elektro- och informationsteknik; []
    Nyckelord :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;

    Sammanfattning : Wideband CDMA (Code Division Multiple Access) is one of the key technologies for future mobile communication systems. This thesis studies various coding and transmission methods for wideband CDMA communications. In a cellular environment, the system performance depends on the interference from other cells. LÄS MER

  5. 5. Uplink Load in CDMA Cellular Systems

    Författare :Erik Geijer Lundin; Fredrik Gunnarsson; Fredrik Gustafsson; Linköpings universitet; []

    Sammanfattning : 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. LÄS MER