Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers
Reexamination Certificate
2003-11-14
2009-02-03
Pham, Chi H. (Department: 2416)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Quadrature carriers
C375S261000
Reexamination Certificate
active
07486608
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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Hashemi Mark
Long Guozhu
O'Toole Anthony J. P.
Cary Charles C
Ikanos Communications Inc.
IP Creators
Mew Kevin
Pham Chi H.
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