H - Electricity – 04 – L
Patent
H - Electricity
04
L
332/86
H04L 5/12 (2006.01)
Patent
CA 1306021
METHOD OF QUADRATURE-PHASE AMPLITUDE MODULATION Abstract of the Disclosure A rectangular array of signal points forming a QAM signal point constellation ismodified by relocating signal points from adjacent corners of the rectangular array to positions extrapolated from the rectangular array and at reduced distances from the origin, corresponding to reduced peak amplitude levels. The relocation is effected in a manner to maintain, at least for a majority of the relocated points, a Hamming distance of one. To this end for a constellation of 22n+1 points, with n=4 or more and points with I and Q amplitudes 1, 3, 5, ... units in the rectangular array, a plurality of points in each quadrant are relocated to positions, relative to positions which they would have in the rectangular array, rotated through an angle of 180° about a point having I and Q amplitude co-ordinates of (2n,2n). In addition, in each quadrant each of a plurality of the signal points which are relocated is located in a position, relative to the position which it would have in the rectangular array, in which one of its I and Q amplitude co-ordinates is increased by 2n and the other is reduced by 2n. Specific examples are described for 512-QAM(n=4).
601323
Haley R. John
Nortel Networks Limited
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