Sökning: "trellis-coded modulation"

Hittade 3 uppsatser innehållade orden trellis-coded modulation.

  1. 1. Improving Error Performance in Bandwidth-Limited Baseband Channels

    Master-uppsats, Avdelningen för elektronik, matematik och naturvetenskap

    Författare :Juan Wilfredo Alfaro Zavala; [2012]
    Nyckelord :channel coding; bandwidth-limited channel; band-limited channel; error performance; BER; lattice codes; trellis-coded modulation; TCM; convolutional coding; multilevel transmission; soft decisions; hard decisions; MPAM;

    Sammanfattning : Channel coding has been largely used for the purpose of improving error performance on a communications system. Typical methods based on added redundancy allow for error detection and correction, this improvement however comes at a cost of bandwidth. LÄS MER

  3. 2. Undersökning av modulationsscheman för existerande bredbandsteknologier

    Uppsats för yrkesexamina på grundnivå, Institutionen för systemteknik

    Författare :Petra Lundström; [2005]
    Nyckelord :Datorteknik; xDSL; modulation; DMT; CAP; PAM; TCM; bitfelssannolikhet; kapacitet; Datorteknik;

    Sammanfattning : In this thesis some different modulation schemes for xDSL-techniques are compared. The investigated techniques are ADSL, G.lite, ADSL2, HDSL, SHDSL and VDSL. The modulation methods used are DMT, CAP and different versions of PAM. LÄS MER

  4. 3. Coding in a discrete multitone modulation system

    L3-uppsats,

    Författare :Daniel Bengtsson; Daniel Landström; [1996]
    Nyckelord :;

    Sammanfattning : Discrete Multitone (DMT) modulation is a multicarrier technique which makes efficient use of the channel, maximizing the htroughput by sending different numbers of bits on different subchannels. The number of bits on each subchannel depends in the Signal-to-Noise Ratio of the subchannel. LÄS MER