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Cross talk counteracting device, signal processing system and cross talk counteracting method

A technology of crosstalk cancellation and signaling, which is applied in the field of data communication, can solve problems such as large amount of calculation and complex implementation, and achieve the effect of small amount of calculation, simple implementation, and realization of crosstalk

Active Publication Date: 2008-06-11
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021]In the above scheme, since the crosstalk cancellation is performed in the frequency domain, for each signal transmitted in the channel, it is necessary to calculate the value, so the amount of calculation is large and the implementation is more complicated

Method used

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  • Cross talk counteracting device, signal processing system and cross talk counteracting method

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Experimental program
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Effect test

Embodiment 1

[0107] Embodiment 1. A crosstalk cancellation method, signal processing such as Figure 5 shown; for clarity, Figure 5The x1 signal is used as the far-end transmission signal, and only the crosstalk between the x2 and x3 signals on the uplink channel receiving signal y1 corresponding to the x1 signal is drawn, and the signals y2, x3 corresponding to the far-end crosstalk sources In the reflection of filtering by y3, only the filter parameters w12 and w13 for time-domain filtering of the y2 and y3 signals are drawn; obviously, this processing model can be naturally extended to various signals, for example, filter parameters can also be added w21 and w23 respectively filter the signals y2 and y3 corresponding to the crosstalk sources x1 and x3 of the x2 signal. In this paper, the unified use of "w ik "Indicates the filter parameters for canceling and filtering the crosstalk from the k-th crosstalk source to the i-th received signal, using "w ii "Indicates the filter paramete...

Embodiment 2

[0114] Embodiment 2, a crosstalk cancellation method, the process is as follows Figure 7 As shown, the signal processing as Figure 8 shown, including:

[0115] C1. Delay the received signal corresponding to the far-end transmitted signal, and perform time-domain filtering on the signals corresponding to each far-end crosstalk source.

[0116] Among them, the time-domain filtering of the signals corresponding to each far-end crosstalk source is mainly realized by convolving the signals corresponding to each far-end crosstalk source with the corresponding filtering parameters; for any one of the signals, the The corresponding filtering parameters are mainly obtained by convolving the far-end crosstalk function of the far-end crosstalk source to the transmitted signal corresponding to the received signal and the inverse of the transfer function of the crosstalk source signal according to the channel transmission matrix h.

[0117] C2. Combining the delay-filtered received sig...

Embodiment 3

[0125] Embodiment 3, a crosstalk cancellation method, refer to Figure 11 , the method includes the following steps:

[0126] E1. Delay the received signal corresponding to the far-end transmitted signal, and perform time-domain filtering on the signals corresponding to each far-end crosstalk source according to the initial filtering parameters.

[0127] The initial filtering parameters can use selected empirical values, or can be randomly generated.

[0128] E2. Combining the delay-filtered received signal corresponding to the far-end transmit signal and the time-domain filtered signal corresponding to each far-end crosstalk source.

[0129] E3. Receiving the feedback synthesized signal or an error signal of a signal related thereto.

[0130] E4. Adjust the filtering parameters according to the error signal in a direction to reduce the mean square value of the error.

[0131] The filter parameters can be adjusted according to the formula w(n+1)=w(n)+μe(n)s(n); among them, ...

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Abstract

The invention relates to the data communication field and discloses a crosstalk canceling method which mainly comprises the following steps: time domain filtering of signals corresponding to a far end crosstalk source is performed; receiving signals corresponding to far end sending signals and the signals after time domain filtering which correspond to the far end crosstalk source are synthesized. The invention also provides a crosstalk canceling device and a signal processing system. The proposal provided by the invention can realize crosstalk cancellation in time domains, and calculation amount is small and realization is simple.

Description

technical field [0001] The invention relates to the field of data communication, in particular to a crosstalk cancellation device, a signal processing system and a crosstalk cancellation method. Background technique [0002] xDSL is a general term for all DSL (Digital Subscriber Line, Digital Subscriber Line) technologies. In addition to DSL for baseband transmission, xDSL for passband transmission uses frequency division multiplexing technology to enable xDSL and POTS (Plain Old Telephone Service, traditional telephone service) to coexist on the same pair of twisted pairs, where xDSL occupies the high frequency band, and POTS occupies the baseband below 4KHz part. A system that provides access to multiple xDSL signals is called a DSLAM (DSLAccess Multiplexer, DSL access multiplexer). [0003] Telephone twisted pair is used as a transmission channel, and its distortion-free information capacity must satisfy Shannon's channel capacity formula: [0004] C ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/08H04B3/32H04B1/707
Inventor 方李明
Owner HUAWEI TECH CO LTD
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