Sökning: "convolutional coding"

Visar resultat 1 - 5 av 32 avhandlingar innehållade orden convolutional coding.

  1. 1. Analysis of Some Convolutional Coding Constructions

    Detta är en avhandling från Department of Information Technology, Lund Univeristy

    Författare :Karin Engdahl; [2002]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; turbo-codes; low-density parity-check convolutional codes; low-density codes; PSK; PAM; QAM; coded modulation; multilevel coding; convolutional codes; multilevel modulation; iterative decoding; Informatics; systems theory; Informatik; systemteori;

    Sammanfattning : This thesis focuses on different convolutional coding constructions for digital communication systems, and on methods to analyze these constructions. The work presented in the thesis can be divided into three main areas; error probability bounds for convolutional codes, analysis of multilevel modulation, and investigation of low-density parity-check convolutional codes. LÄS MER

  2. 2. Multilevel Coding Based on Convolutional Codes

    Detta är en avhandling från Dept. of Information Theory, Lund University, Box 118, S-221 00 LUND

    Författare :Joakim Persson; [1996]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; computer technology; QAM; Systems engineering; PSK; quantization schemes; concatenated codes; rate design; cutoff rate; convolutional codes; Multilevel coding; trellis coded modulation; Data- och systemvetenskap;

    Sammanfattning : [abstract missing].... LÄS MER

  3. 3. Coding and Modulation for Wideband CDMA

    Detta är en avhandling från Ola Wintzell, Dept. of Information Technology, Lund University, PO Box 118, SE-221 00 Lund, Sweden

    Författare :Ola Wintzell; [2002]
    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

  4. 4. On Tailbiting Codes from Convolutional Codes

    Detta är en avhandling från Department of Information Technology, Lund Univeristy

    Författare :Per Ståhl; [2001]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; computer technology; Systems engineering; Teknik; Technological sciences; encoder inverse; systematic feedback encoder; state complexity; trellis; tailbiting termination method; tailbiting code; channel coding; convolutional code; Data- och systemvetenskap; Informatics; systems theory; Informatik; systemteori;

    Sammanfattning : Tailbiting is a method to terminate convolutional codes into block codes. We call these block codes tailbiting codes. This thesis focuses on the encoding of tailbiting codes. The tailbiting method is carefully investigated. LÄS MER

  5. 5. Convolutional Codes for Wireless Packet Data Systems

    Detta är en avhandling från Department of Information Technology, Lund Univeristy

    Författare :Sorour Falahati; [2000]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; tailbiting coding; rate compatible punctured convolutional codes; adaptive modulation system; hybrid type-II ARQ; Rayleigh fading.;

    Sammanfattning : Automatic Repeat reQuest (ARQ) schemes can guarantee an almost error freereception strongly required in data communications. Hybrid type-II ARQschemes are supplied with channel coding to further improve the performance.In these schemes, error correction is performed adaptively which makesthem favorable for applications in time varying channels. LÄS MER