Memory-efficient ADSL transmission in the presence of TCM-ISDN interferers
First Claim
1. A method of communicating data across a channel that experiences near-end cross talk (NEXT) interference and far-end cross talk (FEXT) interference in alternate intervals, the method comprising:
- determining NF, a number of bits per symbol usable in a FEXT-only mode of operation;
determining NS, a number of bits per symbol usable in a single mode of operation;
determining NF-LO, a number of bits per FEXT symbol usable in a reduced-carrier-number mode;
determining NN-LO, a number of bits per NEXT symbol usable in the reduced-carrier number mode;
combining NF-LO and NN-LO to determine whether a dual mode of operation in the reduced-carrier number mode provides a higher data rate than the data rates available in the FEXT-only mode and single mode; and
configuring a modem to transmit using the mode having a highest data rate.
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Accused Products
Abstract
A method of communicating data across a channel that experiences near-end cross talk (NEXT) interference and far-end cross talk (FEXT) interference in alternate intervals. In one embodiment, the method comprises: a) determining NF, the number of bits per symbol usable in a FEXT-only mode of operation; b) determining NS, a number of bits per symbol usable in a single mode of operation; c) determining whether the FEXT-only mode or the single mode provides a higher data rate; and d) configuring a modem to transmit using the mode having a higher data rate. The FEXT-only mode may be determined to have a higher data rate when 126NF>340NS.
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Citations
23 Claims
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1. A method of communicating data across a channel that experiences near-end cross talk (NEXT) interference and far-end cross talk (FEXT) interference in alternate intervals, the method comprising:
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determining NF, a number of bits per symbol usable in a FEXT-only mode of operation; determining NS, a number of bits per symbol usable in a single mode of operation; determining NF-LO, a number of bits per FEXT symbol usable in a reduced-carrier-number mode; determining NN-LO, a number of bits per NEXT symbol usable in the reduced-carrier number mode; combining NF-LO and NN-LO to determine whether a dual mode of operation in the reduced-carrier number mode provides a higher data rate than the data rates available in the FEXT-only mode and single mode; and configuring a modem to transmit using the mode having a highest data rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of communicating data between a first modem and a second modem via a channel that experiences near-end cross talk (NEXT) interference and far-end cross talk (FEXT) interference in alternate intervals, the method comprising:
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said first modem determining a first preferred communication mode from a mode set, wherein the mode set consists of single mode, FEXT-only mode, and reduced-carrier-number dual mode; said second modem determining a second preferred communication mode from said mode set; said first modem transmitting data using said second preferred communication mode; and said second modem transmitting data using said first preferred communication mode. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A modem that comprises:
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a processor configured to couple to a channel to transmit and receive data via the channel, wherein the channel experiences alternate intervals of near-end cross talk (NEXT) and far-end cross talk (FEXT); and a memory coupled to the processor, and configured to store a single bit table; wherein the processor determines a communication mode from a mode set consisting of single mode, FEXT-only mode, and reduced-carrier-number dual mode, and further determines a number of bits per symbol usable in each mode of the mode set, wherein the processor determines which of the modes is a higher data rate mode, and wherein the processor stores the bit table for the higher data rate mode in the memory. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification