Trellis shaping for modulation systems

Details Trellis shaping for modulation systems Trellis shaping for modulation systems

H - Electricity

03

M

354/67

H03M 7/00 (2006.01) H04L 27/34 (2006.01)

Patent

CA 2010117

In a so-called trellis shaping modulation system, instead of mapping a digital data sequence into a sequence of signal points drawn from a finite-dimensional signal point constellation as in typical coded modulation, the data sequence is mapped into a sequence of signal points drawn from a so-called trellis constellation of available infinite-dimensional sequences so that there is no single N-dimensional constellation used repeatedly in each N N-dimensions. The region occupied by the available sequences in sequence space is shaped to minimize the required power; i.e., preferably the region is an approximation to the Voronoi region of the trellis code (where the trellis code is not just a repeated lattice code).

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