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Detection of demapping errors

一种解映射、误差的技术，应用在串扰估计领域，能够解决降低端用户上行数据速率、大不准确性、增加带宽等问题

Inactive Publication Date: 2016-03-30
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution suffers from a resolution problem: at high SNR one wants to achieve a very high cancellation depth
Therefore, there is a certain absolute inaccuracy
In the final stages of convergence, this absolute quantization error yields relatively large inaccuracies
To combat this, many bits would be required to encode the received vector, which would increase the required bandwidth for measurement feedback, thus reducing the end user's uplink data rate

Method used

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  • Detection of demapping errors
  • Detection of demapping errors
  • Detection of demapping errors

Examples

Experimental program
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Embodiment Construction

[0051] figure 1 In can be seen access equipment 1 comprising: a network unit 10 at the CO; a remotely located DPU 20 coupled to the network unit 10 via one or more optical fibers and also via copper ring equipment to various subscriber Customer Premises Equipment (CPE) 30 at the premises.

[0052] The copper ring equipment comprises: a public access part 40, where the subscriber lines are in close proximity to each other and thus cause crosstalk to each other; and a private ring part 50 for eventual connection to subscriber premises. The transmission medium typically consists of high-category copper unshielded twisted pair (UTP).

[0053] DPU 20 includes a vectoring processing unit for jointly processing data symbols transmitted on or received from ring equipment in order to mitigate crosstalk induced in the common access part and to increase the communications achievable on individual subscriber lines data rate.

[0054] exist figure 2 As can be seen in , there is a DPU ...

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Abstract

The present invention relates to a method and apparatus for estimating at least one crosstalk coefficient at a given carrier frequency (k) from at least one respective disturber line (Lm) towards a victim line (Ln) of a vectoring group. At least one crosstalk probing sequence (Smt(k)) out of a set of orthogonal crosstalk probing sequences (131) is assigned to the at least one respective disturber line for modulation at the given carrier frequency of at least one respective sequence of crosstalk probing symbols, and error samples (Ent(k)) as successively measured by a receiver (210n) coupled to the victim line at the given carrier frequency while the at least one sequence of crosstalk probing symbols are being transmitted over the at least one respective disturber line are fed back for crosstalk estimation. The receive d error samples are next correlated with at least one unassigned crosstalk probing sequence (Tmt(k)) out of the set of orthogonal crosstalk probing sequences for detection of a demapping error in the received error samples. The at least one unassigned crosstalk probing sequence is not actively used by any line of the vectoring group during the transmission of the at least one sequence of crosstalk probing symbols over the at least one respective disturber line.

Description

technical field [0001] The present disclosure relates to crosstalk estimation in wired communication systems. Background technique [0002] Crosstalk (or inter-channel interference) is a major source of channel impairments for multiple-input multiple-output (MIMO) wired communication systems, such as Digital Subscriber Line (DSL) communication systems. [0003] As the demand for higher data rates increases, DSL systems are evolving to higher frequency bands, where adjacent transmission lines (i.e. adjacent transmission lines for some or all of their length, such as copper twisted pairs in cable clamps) ) between the more significant crosstalk (the higher the frequency, the greater the coupling). [0004] Different strategies have been developed to mitigate crosstalk and maximize effective throughput, reach and line stability. These technologies are gradually evolving from static spectrum management technology or dynamic spectrum management technology to multi-user signal c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04B3/30H04B3/34H04M3/487
CPCH04B3/487H04L25/022H04L25/0222H04L25/023H04L25/0242H04M3/306H04M3/34H04L5/0048
Inventor C·纽兹曼D·范德黑根
Owner ALCATEL LUCENT SAS