University of Maryland LibrariesDigital Repository at the University of Maryland
    • Login
    View Item 
    •   DRUM
    • Institute for Systems Research
    • Institute for Systems Research Technical Reports
    • View Item
    •   DRUM
    • Institute for Systems Research
    • Institute for Systems Research Technical Reports
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    On Optimal Shaping of Multidimensional Constellations - An Alternative Approach to Lattice-Bounded (Voronoi) Constellations

    Thumbnail
    View/Open
    TR_92-1.pdf (1.155Mb)
    No. of downloads: 490

    Date
    1992
    Author
    Laroia, Rajiv
    Metadata
    Show full item record
    Abstract
    A scheme for the optimal shaping of multidimensional constellations is proposed. This scheme uses some of the ideas from a type of structured vector quantizer originally proposed for the quantization of memoryless sources, and results in N- sphere shaping of N-dimensional cubic lattice based constellations. Its implementation complexity is very reasonable. Because N - sphere shaping is optimal in N dimensions, shaping gains higher than those of N - dimensional Voronoi constellations can be realized. Optimal shaping for a large N however has the undesirable effect of increasing the size and the peak-to-average power ratio of the constituent 2D constellation, thus limiting its usefulness in practical implementation over QAM modems. It is shown that the proposed scheme alleviates this problem by achieving optimal constellation shapes for a given limit on the constellation expansion ratio or the peak-to-average power ratio of the constituent 2D constellation. Finally, compatibility with trellis-coded modulation is demonstrated for the realization of both shaping and coding gain, giving this scheme a distinct edge over lattice- bounded constellations.
    URI
    http://hdl.handle.net/1903/5183
    Collections
    • Institute for Systems Research Technical Reports

    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
    Web Accessibility
     

     

    Browse

    All of DRUMCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister
    Pages
    About DRUMAbout Download Statistics

    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
    Web Accessibility