Efficient implementation of low power mode in digital subscriber line (DSL) transceivers
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United States of America Patent
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Feb 3, 2009
Grant Date -
N/A
app pub date -
Nov 14, 2003
filing date -
Nov 14, 2002
priority date (Note) -
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Abstract
Efficient implementation techniques of a low power mode, (i.e. L2 mode for ADSL2) for DSL transceivers are described. The techniques save memory space and reduce implementation complexity. A constellation mapper in a DSL transmitter determines the number of bits to be retrieved for an ith sub-carrier in the low power mode based on the number of bits allocated for this same sub-carrier in a normal transmission mode, (e.g. L0 mode in ADSL2) and a bit allocation threshold T. A constellation demapper in a DSL receiver determines the number of bits used for an ith sub-carrier in the low power mode based on the bit tables for the L0 mode and the bit threshold T.
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