CN101534273A - Method, device and system for optimizing transmission speed in DSL system - Google Patents
Method, device and system for optimizing transmission speed in DSL system Download PDFInfo
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Abstract
The embodiment of the invention discloses a method, a device and a system for optimizing the transmission speed in a DSL system; wherein the method comprises the following steps of: selecting theoretical attenuation average value which has the minimum difference value compared to the practical attenuation average value according to the practical attenuation average value of the emitting frequency point in handshake stage, taking the line length corresponding to the theoretical attenuation average value as the current line length, and selecting corresponding CE length in the relationship table of circulation extension (CE) length and the line length according to the line length. Under a situation without time domain balance, the embodiment of the invention estimates the current line length according to the practical attenuation average value and the theoretical attenuation average value of the emitting frequency point in the handshake stage and selects the corresponding CE length from the relationship table of the CE length and the line length arranged in advance according to the estimated line length, thus realizing that the maximum speed of the system is ensured when eliminating the system symbol interference.
Description
Technical field
The present invention relates to networking technology area, particularly a kind of square law device and system that in the DSL system, optimizes transmission rate.
Background technology
DSL (Digital Subscriber Line, Digital Subscriber Line) technology is a kind of twisted pair telephone that passes through, be UTP (Unshielded Twist Pair, unshielded twisted pair) carries out the high speed transmission technology of transfer of data, comprise ADSL (Asymmetrical Digital Subscriber Line, ADSL (Asymmetric Digital Subscriber Line)), VDSL (Very-high-bit-rate Digital Subscriber Line, Very-high-speed Digital Subscriber Line) etc.
The DSL system has used DMT (Discrete MultiTone modulation, discrete multitone, DMT modulation) technology widely.Multi-carrier transmission has been utilized the subcarrier of a large amount of orthogonal frequencies, each carrier wave loads for example 4-QAM (4-Quadrature AmplitudeModulation of a certain fixing bit information and corresponding modulation system, the 4-quadrature amplitude modulation), 16-QAM etc., the bit of all subcarriers loads the transmission rate that has determined this DMT system.And in the DSL system, because time-domain signal has experienced some linearities and nonlinear transformation during by channel, caused the diffusion of transmission signal energy, and these diffusions may cause ISI (the Inter Symbol Interference between adjacent-symbol, symbol-interference), thus cause the DMT systematic function to descend.
In order to solve the symbol-interference problem, in the DMT system, each symbol through behind invert fast fourier transformation last CP (Cyclic prefix, Cyclic Prefix) individual sampled point is added to before each symbol as Cyclic Prefix, and removes the influence that this CP sampled point is resisted ISI at receiving terminal.Promptly when this CP length during greater than channel impulse response length, the signal propagation energy of symbol will only can leak within CP length, remove this CP sampled point at receiving terminal, promptly eliminate the influence of the ISI between adjacent-symbol.But CP carrying is garbage for whole system, and when the length of CP was very long, although can tolerate the diffusion of the energy of more channel, this moment, the transmission rate of DMT system can reduce, thereby systematic function is descended.
So prior art when eliminating the symbol-interference of DSL system, can not guarantee the maximization transmission rate of system.
Summary of the invention
The embodiment of the invention provides a kind of methods, devices and systems of optimizing transmission rate in the DSL system, when being implemented in the symbol-interference of eliminating the DSL system, guarantees the maximization transmission rate of system.
For achieving the above object, the embodiment of the invention provides a kind of method of optimizing transmission rate in the DSL system on the one hand, may further comprise the steps: according to the actual attenuation mean value of handshake phase emission frequency, choose the theory decay mean value with the difference minimum of described actual attenuation mean value, and with the pairing line length of described theoretical decay mean value as current line length; From CE (Cyclic Extension, cyclic extensions) length and line length relation table, select corresponding CE length according to described line length.
On the other hand, the embodiment of the invention also provides a kind of device of optimizing transmission rate in the DSL system, comprise: computing module, be used for actual attenuation mean value according to handshake phase emission frequency, choose the theory decay mean value with the difference minimum of described actual attenuation mean value, and with the pairing line length of described theoretical decay mean value as current line length; Select module, be used for selecting corresponding circulating prefix-length from circulating prefix-length with the line length relation table according to described line length; Memory module is used to store CE length and line length relation table.
Again on the one hand, the digital user wire DSL system that the embodiment of the invention also provides a kind of transmission rate to optimize, comprising: data sink, rate optimized device and data sending device, described data sink is used to receive data.Described rate optimized device is used to optimize the transmission rate of DSL system.Described data sending device is used for sending the data that described data sink receives according to the transmission rate of described rate optimized installation optimization.
Compared with prior art, the embodiment of the invention has the following advantages: the embodiment of the invention pre-sets CE length and line length relation table, then according to actual attenuation mean value and the current line length of theoretical decay mean value estimation, and from the CE length that pre-sets and line length relation table, select corresponding CE length according to this line length, when being implemented in the symbol-interference of eliminating the DSL system, guarantee the maximization of the transmission rate of DSL system.
Description of drawings
Fig. 1 is provided with the method flow diagram of CE length and line length relation table for the embodiment of the invention;
Fig. 2 is the impulse response analogous diagram of 500m in line length for channel in the embodiment of the invention;
Fig. 3 be the embodiment of the invention method flow diagram;
Fig. 4 is the rate optimized structure drawing of device of the embodiment of the invention;
Fig. 5 is the DSL system construction drawing that the transmission rate of the embodiment of the invention is optimized.
Embodiment
Below in conjunction with drawings and Examples the specific embodiment of the present invention is described in detail:
The embodiment of the invention is not having under the situation of time domain equalization, according to actual attenuation mean value and the current line length of theoretical decay mean value estimation, and from the CE length that pre-sets and line length relation table, select corresponding CE length according to this line length, when being implemented in the symbol-interference of eliminating the DSL system, guarantee the maximization of the transmission rate of DSL system.
Wherein, the process that CE length and line length relation table be set specifically may further comprise the steps as shown in Figure 1:
Step S101 calculates channel impulse response length under certain line length according to the circuit transfer function.Channel impulse response length when for example being 500m by the simulation calculation line length.Channel impulse response analogous diagram when as shown in Figure 2, being 500m for line length.
Step S102 selects CP length under this line length according to channel impulse response.For example after the channel impulse response length when obtaining line length and be 500m, select CP length.Require CP generally speaking 〉=D+1; Wherein, D is a line length.The initial value of CP length can be made as CP=D+1 so.
Step S103 is according to the CE length under this line length of CP length computation.According to formula: CE=CP+CS-BETA, wherein, CS is a cyclic suffix length, and BETA is a windowing length.In practice, CS length is less to the influence of CE length, can be made as 0, and windowing length BETA generally is known, therefore can obtain corresponding C E length according to the CP length computation.
Step S104 is according to the transmission rate under this line length of CE length computation.At first according to DMT symbol rate formula:
Calculate character rate, wherein 2N is a sample point.Then according to the system transmissions rate equation: DataRate=∑ bi * f
s, calculate the data rate of system.Wherein ∑ bi is the bit loading summation of a DMT symbol.
Step S105, selection meets the pairing CE length of transmission rate of predefined rate requirement according to transmission rate.The described transmission rate that meets predefined rate requirement refers to: under the performance that guarantees system under the described corresponding preset line length, make the transmission rate maximization of described system.If this transmission rate meets the transmission rate of predefined rate requirement, then with this CE length as the CE length under the corresponding line length, otherwise reselect CP (for example establishing CP=D+2), and repeating step S103～S105, until choosing the pairing CE length of the peak transfer rate that meets predefined rate requirement under this line length.Just can calculate CE length corresponding under different line lengths thus, and make CE length and line length relation table, as shown in table 1.
Table 1
| Line length (m) | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 | 100 0 | 110 0 |
| CE length (m) | 3 | 4 | 4 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 7 |
| Line length (m) | 120 0 | 130 0 | 150 0 | 180 0 | 200 0 | 230 0 | 250 0 | 300 0 | |||
| CE length (m) | 6 | 7 | 7 | 8 | 9 | 10 | 10 | 12 |
As shown in Figure 3, the method flow diagram for the embodiment of the invention specifically may further comprise the steps:
Step S301 is according to the actual attenuation mean value and the current line length of theoretical decay mean value estimation of handshake phase emission frequency.Calculate the actual attenuation mean value of current line length by actual measurement at the up/downlink frequency of the carrier wave of handshake phase.Because current line length is known (as shown in table 2 at the up/downlink frequency of the carrier wave of handshake phase, a carrier wave can be selected in handshake phase by the DSL system, if carrier wave is selected, up/downlink the frequency of this carrier wave correspondence is also just selected), the theoretical value decay mean value of each the up-downgoing frequency under different line lengths that can calculate in advance according to the circuit transfer function.According to minimum error method actual attenuation mean value is approached mutually with theoretical decay mean value, determine with this actual attenuation mean value between the theory decay mean value of difference minimum, and the theory of the difference minimum between described and the actual attenuation mean value decayed the pairing default line length of mean value as current line length.
Table 2
Step S302 selects corresponding CE length according to current line length from CE length and line length relation table.As shown in table 1, after CE length was selected, the transmission rate of the system of this CE length correspondence was maximized.
As shown in Figure 4, structure drawing of device for the embodiment of the invention, comprise: computing module 1, be used for actual attenuation mean value according to handshake phase emission frequency, choose the theory decay mean value with the difference minimum of described actual attenuation mean value, and with the pairing line length of described theoretical decay mean value as current line length.Select module 2, be used for selecting corresponding circulating prefix-length from circulating prefix-length with the line length relation table according to described line length.Memory module 3 is used to store CE length and line length relation table.
Wherein, computing module 1 further comprises: 11 first obtain submodule, be used for by measure to calculate obtain described handshake phase up/the actual attenuation mean value of downlink frequency.Second obtains submodule 12, be used for according to described handshake phase up/downlink frequency and default different line lengths, obtain described handshake phase up/the theory decay mean value of downlink frequency under described default different line lengths.Comparison sub-module 13 is used for described actual attenuation mean value and described theoretical decay mean value are made comparisons, and obtains the theory decay mean value with the difference minimum of described actual attenuation mean value.Confirm submodule 14, the theory of the difference minimum between described and the actual attenuation mean value is decayed the pairing default line length of mean value as current line length.
As shown in Figure 5, be the DSL system construction drawing that the transmission rate of the embodiment of the invention is optimized, comprising: data sink 51, rate optimized device 52 and data sending device 53, wherein, data sink 51 is used to receive data.Rate optimized device 52 is used to optimize the transmission rate of DSL system.Data sending device 53 is used for sending the data that data sink 51 receives according to the transmission rate that rate optimized device 52 is optimized.
The embodiment of the invention is not having under the situation of time domain equalization, according to actual attenuation mean value and the current line length of theoretical decay mean value estimation, from the CE length that sets in advance and line length relation table, select corresponding CE length according to described line length, thereby realized when eliminating the system symbol interference, guaranteeing the maximization speed of system.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, certainly also can realize, but the former is better execution mode under a lot of situation by the mode that software adds essential general hardware platform.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of hardware product.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (10)
1, a kind of method of optimizing transmission rate in the digital user wire DSL system is characterized in that, may further comprise the steps:
According to the actual attenuation mean value of handshake phase emission frequency, choose the theory decay mean value with the difference minimum of described actual attenuation mean value, and with the pairing line length of described theoretical decay mean value as current line length;
From cyclic extensions CE length and line length relation table, select corresponding CE length according to described line length.
2, in the DSL system, optimize the method for transmission rate according to claim 1, it is characterized in that, described actual attenuation mean value according to handshake phase emission frequency, choose theory decay mean value with the difference minimum of described actual attenuation mean value, and with the pairing line length of described theoretical decay mean value as current line length, specifically comprise:
By measure to calculate obtain described handshake phase up/the actual attenuation mean value of downlink frequency;
According to described handshake phase up/downlink frequency and default different line lengths, obtain described handshake phase up/the theory decay mean value of downlink frequency under described default different line lengths;
Described actual attenuation mean value and described theoretical decay mean value are made comparisons, obtain theory decay mean value with the difference minimum of described actual attenuation mean value;
The theory of the difference minimum between described and the actual attenuation mean value is decayed the pairing line length of mean value as current line length.
3, in the DSL system, optimize the method for transmission rate according to claim 1, it is characterized in that, comprising:
Set in advance described CE length and line length relation table.
4, as in the DSL system, optimizing the method for transmission rate as described in the claim 3, it is characterized in that described described CE length and the line length relation table of setting in advance specifically comprises:
According to the channel impulse response length under the default different line lengths of circuit transfer function calculating;
According to the cyclic prefix CP length under the described channel impulse response selection corresponding preset line length;
According to the CE length that meets predefined rate requirement under the described CP length computation corresponding preset line length.
5, as in the DSL system, optimizing the method for transmission rate as described in the claim 4, it is characterized in that, described according to the CE length that meets predefined rate requirement under the CP length computation corresponding preset line length, specifically comprise:
According to the CE length under the described CP length computation corresponding preset line length;
According to the transmission rate under the described CE length computation corresponding preset line length;
Select to meet the pairing CE length of predefined rate requirement under the corresponding preset line length according to described transmission rate.
6, as in the DSL system, optimizing the method for transmission rate as described in claim 4 or 5, it is characterized in that, meet predefined rate requirement under the described corresponding preset line length, be specially:
Under the performance that guarantees system under the described corresponding preset line length, make the transmission rate maximization of described system.
7, a kind of device of optimizing transmission rate in the digital user wire DSL system is characterized in that, comprising:
Computing module is used for the actual attenuation mean value according to handshake phase emission frequency, chooses the theory decay mean value with the difference minimum of described actual attenuation mean value, and with the pairing line length of described theoretical decay mean value as current line length;
Select module, be used for selecting corresponding circulating prefix-length from circulating prefix-length with the line length relation table according to described line length;
Memory module is used to store cyclic extensions CE length and line length relation table.
8, as in the DSL system, optimizing the device of transmission rate as described in the claim 6, it is characterized in that described computing module comprises:
First obtains submodule, be used for by measure to calculate obtain described handshake phase up/the actual attenuation mean value of downlink frequency;
Second obtains submodule, be used for according to described handshake phase up/downlink frequency and default different line lengths, obtain described handshake phase up/the theory decay mean value of downlink frequency under described default different line lengths;
Comparison sub-module is used for described actual attenuation mean value and described theoretical decay mean value are made comparisons, and obtains the theory decay mean value with the difference minimum of described actual attenuation mean value;
Confirm submodule, the theory of the difference minimum between described and the actual attenuation mean value is decayed the pairing default line length of mean value as current line length.
9, a kind of digital user wire DSL system of transmission rate optimization is characterized in that, comprising: data sink, rate optimized device and data sending device,
Described data sink is used to receive data;
Described rate optimized device is used to optimize the transmission rate of DSL system;
Described data sending device is used for sending the data that described data sink receives according to the transmission rate of described rate optimized installation optimization.
10, the DSL system that optimizes as transmission rate as described in the claim 9 is characterized in that described rate optimized device comprises:
Computing module is used for the actual attenuation mean value according to handshake phase emission frequency, chooses the theory decay mean value with the difference minimum of described actual attenuation mean value, and with the pairing line length of described theoretical decay mean value as current line length;
Select module, be used for selecting corresponding circulating prefix-length from circulating prefix-length with the line length relation table according to described line length;
Memory module is used to store cyclic extensions CE length and line length relation table.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370892A (en) * | 2016-05-11 | 2017-11-21 | 中兴通讯股份有限公司 | The optimization method and device of digital subscriber line |
| CN112953676A (en) * | 2019-12-11 | 2021-06-11 | 鹤壁天海电子信息系统有限公司 | Rate self-adaption method and node of multi-bandwidth frequency hopping equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370892A (en) * | 2016-05-11 | 2017-11-21 | 中兴通讯股份有限公司 | The optimization method and device of digital subscriber line |
| CN107370892B (en) * | 2016-05-11 | 2021-06-04 | 中兴通讯股份有限公司 | Method for optimizing digital subscriber line |
| CN112953676A (en) * | 2019-12-11 | 2021-06-11 | 鹤壁天海电子信息系统有限公司 | Rate self-adaption method and node of multi-bandwidth frequency hopping equipment |
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