Method, device and system for tests for crosstalk in multiuser communication lines

FIELD: information technologies.

SUBSTANCE: method contains the following stages: on transmitting side they download orthogonal codes in lines from a number of multiuser communication lines, signals are sent as loaded with these codes, which correspond to lines, on receiving side they receive information on vector of transient noise according to vector of actually received signal, and quantitative value of transient noise is identified on the side of a certain line out of mentioned lines. System contains transmitting device, which sends test signals loaded with orthogonal codes, and receiving device, which receives test signals and calculates quantitative value of transient noise.

EFFECT: detection of transient noise among multiple lines for optimisation of lines operation.

13 cl, 12 dwg

 

The technical field related to the invention of

The present invention relates to techniques for network communications and, in particular, to techniques for testing cross (transitional) interference on multi-drop lines.

The level of technology

Technology asymmetric digital subscriber line (ADSL) over the years of its development evolved from a first generation ADSL, ADSL2 and ADSL2+second generation ultra high performance digital subscriber line (VDSL2). With increasing frequency range, it also increases the bandwidth of ADSL and ADSL2, which range downlink less than 1.1 MHz, provide the data rate of downlink up to 8 Mbit/s ADSL2+ extends the bandwidth of 2.2 MHz and provides a maximum data rate of downlink 24 Mbit/.VDSL2 uses range up to 30 MHz for downlink and provides symmetrical data rate of ascending and descending lines 100 Mbit/s

However, as the growth of the private range used in the xDSL technology, become a negative factor transient interference, especially in the high frequency range. There are transient noise at the near end (NEXT) and transient noise at the far end (FEXT), as shown in figure 1 and figure 2. NEXT does not have a significant negative impact on the river is the bot system, while FEXT seriously affects the transmission on the wire.

For example, when multiple subscribers are activated xDSL services in the cable bundle, because FEXT on some lines may experience low data rate and instability or even unable to activate the service xDSL, which leads to a low speed activation of the access multiplexer digital subscriber line (DSLAM).

Some operators have developed their own technical requirements for spectrum management in order to prevent crosstalk between devices in different places. The currently used technologies and solutions to the problems of crosstalk include detection of multiple subscribers, the technology of detecting multiple subscribers with the highest likelihood and detection of multiple subscribers suppression.

However, existing technologies are complex and require a large amount of computation. In addition, these technologies only optimize DSL or system on the basis of some statistical characteristics of transient interference, instead of providing a quantitative test on transient interference on multiple lines. As a result, the transmission quality along the lines of DSL cannot be optimized significantly.

The invention

The achievement of these goals is provided by the following technical solution.

A variant embodiment of the invention provides a method for testing transient interference on multi-drop lines. The method includes the steps are:

on the transmission side load line multi-drop communication lines orthogonal codes extended range and send signals loaded orthogonal codes extended range, and orthogonal codes extended spectrum correspond to the lines; and

on the receiving side receives the information about the vector a crosstalk according to the vector of received signals and determine a quantitative value of the crosstalk from a certain line of these lines.

The method also includes displaying orthogonal codes extended range on each line, from among multi-drop communication lines and further comprises the steps are:

mark each line, display labels on a group of orthogonal codes extended range and store the mapping in the table display the value.

The loading phase orthogonal codes extended range test line further comprises the steps are:

sequentially load the orthogonal codes extended spectrum corresponding to the lines in the characters on tone or multiple tones, lines, and each line of each character is loaded by one or more bits of the orthogonal code extended spectrum corresponding to this line.

The phase information on the crosstalk vector based on the vector of the actually received signal includes the steps are:

on the receiving side of the test line get the vector of received signals containing information about transient noise from received signals each tone or line to test the line by a fast Fourier transform (FFT);

calculate the difference between the vector of received signals and the expected vector of received signals, and consider this difference of information about transient disturbances for tone or line.

The step of determining the quantitative value of the crosstalk from a certain line for the test line contains the stages on which:

perform the narrowing of the range of information about the crosstalk vector for tone or line by using respective orthogonal codes extended spectrum; and

get the number of the military value of the crosstalk for a certain line on the test line or test tone line in accordance with the result of the narrowing of the spectrum.

The result of the narrowing of the range

where L is the length of the orthogonal codes of the extended spectrum bi- orthogonal code of extended spectrum corresponding to line i, and ∆(a+jb) is the vector of transient interference.

The stage of obtaining the quantitative value of the crosstalk from a certain line for the test line or test tone line contains the stages on which:

perform a MOD operation on the result of the narrowing of the spectrum to obtain quantitative values and determine if it exceeds a specified threshold value; determine if that value exceeds a certain threshold, we take this value as the quantitative value of the crosstalk from a certain line for the test line; otherwise, determine the absence of the influence of crosstalk from a certain line on the test line.

In the embodiment of the invention in the case where the test transient interference is performed on the set of tones line, the step of obtaining the quantitative value of the crosstalk from a certain line for the test line or test tones line contains the steps are:

determine the outcome of expansion in the next test tone line, calculate and determine the quantitative value per the original interference from a certain line on the test line until until the results of the narrowing of the range for all of the tones of the test line, and receive test results on transient interference.

The method also includes the steps are:

get the phase angle signal crosstalk on the test line on the basis of the results of the narrowing of the spectrum and determine the phase characteristics on the basis of the initial phase angle of the test line.

A variant embodiment of the invention is also a transmitting device for testing transient interference on multi-drop lines containing:

the configuration module signals the boot is made with the ability to maintain the correspondence between the labels of the lines and orthogonal codes extended range and to provide a loading module test signals downloadable signals; and

loading module test signals made with the possibility to download the test signals based on the orthogonal codes extended spectrum corresponding test lines provided by the configuration module signals download, and send test signals.

A variant embodiment of the invention is a receiving device for testing transient interference in multi-drop communication lines containing:

a module for receiving and processing signals, the implementation of the tion with the ability to receive signals from the transmitting device and to obtain the vector of received signals by FFT;

the evaluation module of the vector of transient interference is made with the possibility to calculate the crosstalk vector based on the vector of received signals and the estimated vector of received signals of the receiving device; and

module calculate the value of a crosstalk made with the possibility to calculate the quantitative value of the crosstalk from a certain line for the test line based on the crosstalk vector.

Module calculate the value of a crosstalk contains:

module narrowing of the range, made with the possibility of narrowing the spectrum of the vector of transient interference and obtain a result of the narrowing of the spectrum;

module calculate the value and phase executed with the ability to perform a MOD operation on the result of the narrowing of the spectrum to obtain quantitative values and phase;

the module is a decision made with the possibility to make a decision about the presence of transient noise on the basis of the result of the MOD operation and a predetermined threshold and to determine the quantitative value of the crosstalk.

A variant embodiment of the invention is also a system for testing transient interference in multi-drop communication lines containing the transmitting device and the receiving device and the transmitting device transmits the test signals, and the receiving device receives the IP is atitelnye signals and calculates a quantitative value of the crosstalk.

In the technical solution provided in embodiments of the invention, can be identified the source of transient noise and can be computed the value of a crosstalk. Transient interference on the set of DSL lines can be tested in real time without affecting the quality of the transmission lines. Therefore, there is no any interference in the running line and device.

The test results show how many lines have a significant impact on the test line and reflect the degree of this impact, which provides a powerful basis for dynamic control range.

Using the present invention the communication line can provide higher and more stable transmission speed and overall performance of the system and you can improve the speed of activation DSLAM.

Brief description of drawings

Figure 1 shows the schematic diagram NEXT.

Figure 2 shows schematic diagram of FEXT.

Figure 3 shows a model of transient interference when transmitting on multiple lines;

Figure 4 shows the sequence of implementation of the method in accordance with the embodiment of the invention;

Figure 5 shows the display of the labels of the lines orthogonal codes;

Figure 6 shows the loading codes extended range;

Figure 7 shows the download Kodo is an extended range in the symbol;

On Fig given modulation and reception vector;

Figure 9 shows the passage of signals in the test method for transient interference;

Figure 10 shows the test result on transient interference on one line;

Figure 11 shows the test result on transient interference on the set of lines; and

On Fig the structure of the system, which is realized in the embodiment of the invention.

Detailed description of the invention

The main objectives of the present invention lies in the discovery of the source of transient noise and quantification of transient interference. If the test transient interference can be spent on the DSL devices in real time, the DSL device may respond to transient noise in real time and thereby prevent crosstalk between multi-drop lines DSL and provide data about transient disturbances for optimization of DSLAM devices.

In practice, the xDSL line in the same cable bundle can create each other transient interference. The basic idea of the present invention is to carry out testing on transient interference between multiple pairs of xDSL lines, and identification of the source of transient noise and quantification of crosstalk by separating codes.

The method, implemented in a variant implementation is tvline of the present invention, described in detail below with reference to the accompanying drawings.

Figure 3 φi,j(n) denotes the transitive interference from line j in relation to the n-th tone of the line i. The total energy of the transient disturbances in the attitude of the n-th tone line i is equal to

where φi,j(n)=0 (i=j), and M is the number of lines.

Usually the total energy of the transition noise can be roughly measured in the period of silence during the initialization line. The total energy of transient interference can be used to assess the quality of the line, but it cannot be applied for optimization of the lines as a whole, which requires determining a crosstalk between every two lines in the system, i.e. the magnitude of φi,j(n) for each line in the system, where i and j vary from 1 to M.

The impact on a certain line in the form of crosstalk can have all the other lines. As shown in figure 4, the impact in the form of transient interference have on the line i line 1 through j. The challenge is how to separately identify transient interference from each line and thereby to determine the transient interference from each line in relation to the line i and how to identify the particular line which has an impact on the line i in the form of crosstalk.

In the embodiment of the present invention to determine the PE achtnich interference for every two lines in the system are used for the label. In this case, the crosstalk signals in General can be deduced from the amount of crosstalk from each line, and thus it is possible to determine the transient interference from each line on the line i.

Figure 4 shows the procedure that implements the method, presents a variant embodiment of the invention.

Step 41: Mark interfaces lines in accordance with a certain sequence or rule, so that it was possible to identify the different lines.

For example, to mark a line 1 to i and j. For applying labels on the line can also be used in other ways. After the line marked for identification purposes, at the subsequent stages can be calculated transient interference from each line separately.

Step 42: to Display a label on the group of orthogonal codes extended spectrum to establish a one-to-one correspondence with the length of the orthogonal codes extended range equal to L, and store the mapping in the map table, as shown in the table.

The mapping between labels and orthogonal codes extended range
Tag lines123 ...n
Orthogonal codeOrthogonal code b1Orthogonal
b2
Orthogonal
code b3
...Orthogonal
code bn

Test transient interference can be performed by loading the corresponding orthogonal codes of a wide range of experience in various channels (i.e. in the test line, identified by the labels).

Step 43: figure 6 shows the load orthogonal codes extended range on a certain tone of test channels, depicted in figure 5. Namely, a certain tone of one of the test channels in each character is loaded one bit orthogonal code extended spectrum corresponding to this test channel, and bits of the orthogonal code of a wide range of loads L consecutive symbols, where L is the length of the orthogonal code extended range.

Or a certain tone of one of the test channels in each character loaded k bits of the orthogonal code extended spectrum corresponding to the test channel, and bits of the orthogonal code of a wide range of load L/k consecutive symbols,where L/k is a number L, divided by k. That way it was possible to implement, the number of L/k must be an integer.

For example, to determine a crosstalk from line 1 on figure 5 that the loading phase orthogonal code extended range is implemented at line 1.

Code loaded in line 1, is orthogonal code b1 corresponding to the line 1 in the table.

As shown in Fig.7, the bits of the code word of the extended spectrum is loaded into the symbol in the appropriate manner and on the receiving side is the narrowing of the spectrum of the symbol. The result of the narrowing of the spectrum may reflect the influence of crosstalk and the degree of crosstalk on the test line, but may not reflect the impact on a certain tone and the degree of crosstalk on a certain tone on the receiving side. This method is simple and saves time, thereby playing an important role in the quantitative analysis.

Step 44: Obtain the vector of received signals containing information on the transition noise by FFT to determine the vector of transient interference in the subscriber terminal equipment connected to the test channel.

Under the influence of transient interference and noise from other lines, the vector of Y of the test channel is extended and rotated into a vector X. the Test channel can be any line from line 2 to line i and line j.

the AK is shown in Fig, the crosstalk vector ∆(a+jb), which includes transient interference from other lines in relation to the test line, represents the difference between the signal vectors X and Y.

To calculate on the receiving side, the vector of received signals and to determine the vector of crosstalk in accordance with the vector of received signals and the expected vector of received signals.

Step 45: Implement the narrowing of the range of vector crosstalk ∆(a+jb) with orthogonal codes corresponding to each line according to the map table obtained in step 42.

The narrowing of the range of vector crosstalk is shown in Fig.9. This uses the following formula:

where L is the length of the orthogonal codes extended spectrum, and bi- orthogonal code extended range in the table, i.e. orthogonal code.

Step 46: Perform a MOD operation on the result of the narrowing of the spectrum (complex number).

Step 47 to Determine whether the result of the MOD operation specified threshold. If exceeds, to perform step 48; otherwise, perform step 49.

Step 48: Determine that a particular test channel having an impact in the form of crosstalk on this test channel, to accept the result of the MOD operation as a relative quantitative values of the transition is s interference and to perform step 49.

That is, to determine in accordance with the result of the narrowing of the spectrum, does a particular test channel effect in the form of transient interference, and to determine the calculations result in the quantitative value of the crosstalk from this particular test channel test channel in accordance with the result of the operation MOD and mark a line corresponding orthogonal code extended range.

For example, if the result of the narrowing of the spectrum on the stage 45 is obtained on the basis of the orthogonal code b2 line 2 and this result exceeds the specified threshold, then line 2 impacts in the form of crosstalk on the test line, and transient crosstalk takes place on the tone that you downloaded in step 43, and the result of the operation MODES, calculated on the basis of the result of the narrowing of the spectrum, can be adopted as the relative quantitative value of the crosstalk.

In the method provided in the embodiment of the invention, the narrowing of the spectrum on the stage 45 can also be used to calculate the phase response of the crosstalk. For example, if the result at step 45 is equal to α+jβ, then the phase angle signal crosstalk on the test line can be determined by the formula φ1=arctag(β/α). The initial phase angle of the test line (or test pipe) & Phi;0 known and therefore the phase change crosstalk is equal to φ1- Φ0then there is the phase response.

Step 49: Determine whether all the colours of the line defined by quantitative value of the crosstalk. If not at all, then perform step 43; otherwise, terminate the test obtain the quantitative value of the crosstalk and phase characteristics.

It should be noted that, as shown in figure 10, the transient noise in all colours and their quantitative values can be obtained simultaneously by simultaneous transmission on the stage 43 orthogonal codes extended range on each tone.

In the embodiment of the invention the test transient interference can be performed on any line of the multiple communication lines. For example, three lines of communication have an impact in the form of crosstalk on some line and, as shown in figure 11, the three curves characterize the test result on transient interference on these three lines.

A variant embodiment of the invention also provides a system for testing transient interference on multi-drop lines depicted on Fig. The system includes a transmitting device and the receiving device. The transmitting device sends test signals, and the receiving device receives the test signals and wycis yet quantitative value of the crosstalk.

The device described in detail below.

1. The transmitting device to test on transient interference on multi-drop lines contains:

the configuration module signals the boot is made with the ability to maintain the correspondence between the labels of the lines and orthogonal codes extended range and to provide a loading module test signals downloadable signals (detailed description of the boot configuration is omitted because it is described above); and

loading module test signals made with the possibility to download the test signals based on the orthogonal codes extended spectrum corresponding test lines provided by the configuration module signals download, and send test signals to the receiving device (specific boot process can be defined depending on the requirements, a detailed description of the boot is omitted because it is described above).

2. A receiving unit for testing transient interference on multi-drop lines contains:

the receiving module and the signal processing performed with the opportunity to receive signals from the transmitting device and to obtain the vector of received signals by FFT;

the evaluation module of the vector of transient interference is made with the possibility to calculate the crosstalk vector is and the basis vector of received signals and the estimated vector of received signals; that is, the difference between the vector of received signals and the expected vector of received signals, and is the vector of transient interference;

module calculate the value of a crosstalk made with the possibility to calculate the quantitative value of the crosstalk from a certain line for the test line on the basis of the vector of transient interference, the module contains:

module narrowing of the range, made with the possibility of narrowing the spectrum of the vector of transient interference and obtain a result of the narrowing of the spectrum (the method shown in detail in figures 9 and here omitted);

module calculate the value and phase executed with the ability to perform a MOD operation on the result of the narrowing of the range for the value and phase of the MOD, and the phase is characterizing transient interference, and the value of MOD is the quantitative value of the crosstalk; and

the module is a decision made with the possibility to make a decision about the presence of transient noise on the basis of the result of the MOD operation and a predetermined threshold and to determine the quantitative value of the crosstalk, for example to determine that there are transient interference, and take the result MOD as the quantitative value of the crosstalk, if the result of the MOD operation exceeds a certain threshold; otherwise, to determine the absence of crosstalk

In the embodiment of the present invention can be identified the source of transient noise and can be defined quantitative value of the crosstalk. The implementation of option exercise does not affect the quality of the transmission lines, and therefore there is no impact on the performance of the lines and devices. The test result shows how many lines has a significant impact on the test line and reflects the degree of this impact, which gives a strong basis for the dynamic control range.

Although the invention has been described in terms of several embodiments, the invention is not limited to these options for implementation. It is obvious that the experts in this field of technology can make to the invention, various modifications and modifications, without departing from the essence and scope of the invention. Understood that the invention cover modifications and alterations, provided that they are not beyond the scope of protection defined by the following claims and its equivalents.

1. Test method for transient interference on multi-drop lines containing phases in which on the transmission side load line from among the multi-drop communication lines orthogonal codes and send signals loaded orthogonal codes and orthogonal to the dy correspond to the lines; and on the receiving side receives the information about the vector a crosstalk according to the vector of the actually received signal and determine a quantitative value of the crosstalk from a certain line of these lines.

2. The method according to claim 1, wherein the orthogonal codes are displayed on each line of the number of multi-drop communication lines containing the segments, which marks every line display labels on a group of orthogonal codes, and store the mapping in the map table.

3. The method according to claim 1, in which the loading phase orthogonal codes includes a step in which continuously loads of orthogonal codes corresponding to the lines in the symbols on subcarrier or multiple subcarriers lines, with each line, each character is loaded by one or more bits of the orthogonal code corresponding to this line.

4. The method according to any one of claims 1, 2, or 3, wherein the step of obtaining information about the crosstalk vector based on the vector of the actually received signal contains the time that on the receiving side of the test line get the vector of received signals containing information about transient noise from received signals of each subcarrier or line test line through the fast Fourier transform (FFT); calculate the difference between the received vector when galow and the expected vector of received signals, and taking the difference in the quality of information about transient noise for a particular subcarrier or the test line.

5. The method according to any one of claims 1, 2, or 3, wherein the step of determining the quantitative value of the crosstalk from a certain line contains the steps that perform an operation on information about the crosstalk vector for subcarrier or lines; and obtain a quantitative value of the crosstalk from a certain line for the test line or subcarrier test line in accordance with the result of operations on information about the crosstalk vector.

6. The method according to claim 5, in which the result of operations on information about the crosstalk vector iswhere L is the length of the orthogonal codes, bi- orthogonal code corresponding to the line i, a, Δ(a+jb) - information on the crosstalk vector.

7. The method according to claim 5, in which the step of obtaining the quantitative value of the crosstalk from a certain line for the test line or subcarrier test line further comprises the stages on which to perform the operation module on the result of operations on information about the crosstalk vector to obtain quantitative values with the corresponding orthogonal codes and determine if it exceeds a specified threshold value; if it is determined that the value exceeds the specified threshold, take this value as a quantitative the values of transient interference from a certain line for the test line; otherwise, determine the absence of the influence of crosstalk from a certain line on the test line.

8. The method according to claim 7, in which when the transient noise is detected on multiple subcarriers of the test line, the step of obtaining the quantitative value of the crosstalk from a certain line for the test line or subcarriers test line contains the stages, which determine the outcome of operations on information about the vector of transient interference on the next subcarrier test line, calculate and determine the quantitative value of the crosstalk from a certain line on the next subcarrier test line until, until you get the results of operations information on the crosstalk vector for all subcarriers of the test line, and receive test results on transient interference.

9. The method according to claim 5, further comprising stages which receive phase angle signal crosstalk on the test line on the basis of the results of operations information on the crosstalk vector and determine the phase characteristics on the basis of the initial phase angle of the test line.

10. The transmitting device to test on transient interference on multi-drop lines that contains the module which is of the signals download made with the ability to maintain the correspondence between the labels of the lines and orthogonal codes and to provide a loading module test signals downloadable signals; and a sending module test signals made with the possibility to download the test signals based on the orthogonal codes corresponding test lines provided by the module signal conditioning load, and send test signals for testing the transient interference.

11. A receiving unit for testing transient interference on multi-drop lines containing the module receiving and processing signals, is configured to receive signals from the transmitting device and to obtain the vector of the predetermined signal by fast Fourier transform (FFT); the evaluation module of the vector of transient interference is made with the possibility to calculate the crosstalk vector based on the vector of received signals and the vector of predetermined signal receiving device; and a module for calculating the value of the crosstalk for a particular line made with the possibility to calculate the quantitative value of the crosstalk from a certain line for the test line on the basis of the vector crosstalk in accordance with the orthogonal codes corresponding lines are among the many who bonetsky communication lines, moreover, the module calculate the value of a crosstalk contains the module narrowing of the spectrum with the ability to perform an operation on a vector of transient interference and obtain the result of the operation on the information about the crosstalk vector; calculate the value and phase, performed with the opportunity to perform an operation on the module on the result of operations on information about the crosstalk vector to obtain quantitative values and phase; a decision made with the possibility to make a decision about the presence of transient noise on the basis of the operation module and a predetermined threshold and to determine the quantitative value of the crosstalk.

12. System testing transient interference in multi-drop communication lines containing the transmitting device of claim 10 and a receiving device according to claim 11, whereby the transmitting device transmits the test signals, loaded orthogonal codes, in line among multi-drop communication lines, and the receiving device receives the test signals and calculates a quantitative value of the crosstalk by means of respective orthogonal codes.

13. System according to clause 12, in which the transmitting device is a multiplexer access to digital subscriber line (DSLAM), and the receiving device is a subscriber to acnee equipment (CPE).



 

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