Digital modulation using QAM with multiple signal point constellations not equal to a power of two
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United States of America Patent
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Jan 28, 1997
Grant Date -
N/A
app pub date -
Feb 4, 1994
filing date -
Dec 23, 1993
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Abstract
Data are transmitted using multiple carriers modulated by quadrature amplitude modulation. In general, the carriers carry different numbers of bits, to exploit the fact that the properties of a transmission path are more favorable to carriers at some frequencies than to those at others. The bit allocation process is made closer to optimum by permitting allocation of a non-integer number of bits to a carrier. Input bits are grouped for several carriers and this binary representation is converted to a number representation in which the base of each digit corresponds to the number of points in the QAM constellation for a respective carrier (or to this number divided by a power of two).
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