Sökning: "code division multiple access"

Visar resultat 1 - 5 av 39 avhandlingar innehållade orden code division multiple access.

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

    Författare :Anders Persson; Chalmers tekniska högskola; []
    Nyckelord :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;

    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

  3. 2. Asynchronous direct-sequence code-division multiple access systems : low complexity data detection and robust detectors

    Författare :Thomas Östman; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  4. 3. 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

  5. 4. Detection for multiple input multiple output channels : analysis of sphere decoding and semidefinite relaxation

    Författare :Joakim Jaldén; Björn Ottersten; Zhi-Quan Luo; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telekommunications; MIMO; Detection; Sphere Decoder; Semidefinite Relaxation; Telecommunication; Telekommunikation;

    Sammanfattning : The problem of detecting a vector of symbols, drawn from a finite alphabet and transmitted over a multiple-input multiple-output (MIMO) channel with Gaussian noise, is of central importance in digital communications and is encountered in several different applications. Examples include, but are not limited to; detection of symbols spatially multiplexed over a multiple-antenna channel and the multiuser detection problem in a code division multiple access (CDMA) system. LÄS MER

  7. 5. Synchronization and data detection in long-code CDMA systems / Pei Xiao %C Göteborg

    Författare :Pei Xiao; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; iterative demodulation; Rayleigh-fading channels; acquisition; tracking; long spreading codes; multiuser detector; additive white Gaussian noise AWGN ; short spreading codes; data detection; synchronization; channel estimation; direct sequence code division multiple access DS-CDMA ; orthogonal modulation; delay estimator; multiple access interference MAI ;

    Sammanfattning : .... LÄS MER