Method and system for channel equalization and crosstalk estimation in a multicarrier data transmission system
First Claim
1. A multicarrier data transmission system, comprising:
- a FFT unit that receives incoming time-domain symbols and outputs corresponding frequency-domain symbols;
an adaptive channel equalizer that produces a noise estimate based on data associated with the incoming time-domain symbols, the noise estimate pertaining to at least inter-carrier interference and inter-symbol interference;
a subtractor that subtracts the noise estimate from the frequency-domain symbols to produce channel adjusted symbols;
a far-end crosstalk (FEXT) unit that adaptively determines FEXT channel coefficients and reduces FEXT from the channel adjusted symbols in accordance with the FEXT channel coefficients so as to produce desired symbols; and
a symbol detector that examines the desired symbols to determine detected symbols.
7 Assignments
0 Petitions
Accused Products
Abstract
Improved techniques for concurrent channel equalization and far-end crosstalk channel compensation (e.g., estimation and/or cancellation) in a multicarrier data transmission system are disclosed. The improved techniques can produce coefficients for an electronic filter that provide channel equalization and for an electronic filter that provides cancellation of the far-end crosstalk. These coefficients can be initially trained and then subsequently updated during data transmission. Optionally, common coefficient determination resources can be utilized for both far-end crosstalk and near-end crosstalk purposes. These improved techniques are particularly suitable for use with a digital multicarrier communication system having multiple-input multiple-output systems.
55 Citations
38 Claims
-
1. A multicarrier data transmission system, comprising:
-
a FFT unit that receives incoming time-domain symbols and outputs corresponding frequency-domain symbols; an adaptive channel equalizer that produces a noise estimate based on data associated with the incoming time-domain symbols, the noise estimate pertaining to at least inter-carrier interference and inter-symbol interference; a subtractor that subtracts the noise estimate from the frequency-domain symbols to produce channel adjusted symbols; a far-end crosstalk (FEXT) unit that adaptively determines FEXT channel coefficients and reduces FEXT from the channel adjusted symbols in accordance with the FEXT channel coefficients so as to produce desired symbols; and a symbol detector that examines the desired symbols to determine detected symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A multicarrier data transmission system, comprising:
-
a FFT unit that receives incoming time-domain symbols and outputs corresponding frequency-domain symbols; an adaptive channel equalizer that produces a noise estimate based on data associated with the incoming time-domain symbols, the noise estimate pertaining to at least inter-carrier interference and inter-symbol interference; a subtractor that subtracts the noise estimate from the frequency-domain symbols to produce channel adjusted symbols; a far-end crosstalk (FEXT) estimator that adaptively determines FEXT channel coefficients; a descaling unit that scales the channel adjusted symbols to produce desired symbols; and a symbol detector that examines the desired symbols to determine detected symbols, wherein the FEXT channel coefficients are used to produce scaling data, and wherein said descaling unit operates to scale the channel adjusted symbols in accordance with the scaling data. - View Dependent Claims (21, 22, 23, 24, 25, 26)
-
-
27. A method for operating a multicarrier data transmission system, the method comprising:
-
receiving incoming time-domain symbols; converting the incoming time-domain symbols into frequency-domain symbols; producing a noise estimate based on data associated with the incoming time-domain symbols, the noise estimate pertaining to at least inter-carrier interference and inter-symbol interference; subtracting the noise estimate from the frequency-domain symbols to produce channel adjusted symbols; determining far-end crosstalk (FEXT) channel coefficients and reducing FEXT from the channel adjusted symbols in accordance with the FEXT channel coefficients so as to produce desired symbols; and examining the desired symbols to determine detected symbols. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
-
Specification