CN101854232A - Method for resisting impulse noise interference and device thereof - Google Patents

Abstract

The invention discloses a method for resisting impulse noise interference and a device thereof, belonging to the field of communication. The method comprises the steps of: acquiring carrier wave original static line noise; calculating virtual static line noise according to the acquired original static line noise; and accessing a multiplexer device into a local side digital subscriber line, and sending the virtual static line noise. The device comprises an acquisition unit, a calculation unit and a transmission unit.The technical scheme of the invention can more effectively resist the noise interference.

Description

The method and apparatus that anti-impulsive noise is disturbed

Technical field

The present invention relates to the communications field, the method and apparatus that particularly a kind of anti-impulsive noise is disturbed.

Background technology

Cable service operator adopts hybrid fiber/coaxial cable infrastructure, and leased line provides triple play service for the user: integrate Video service, based on the data, services and the voice service of cable modem.At present, telecommunications company is according to the development of situation, strengthened ADSL (Asymmetric Digital Subscriber Line) (Asymmetric Digital Subscriber Line, ADSL) infrastructure construction, and released internet protocol TV (Internet ProtocolTelevision by the Video Codec that efficiently utilizes bandwidth, IPTV) service, this helps the all-round popularization of broadband technology, and realizes the triple play service integration function of self.

Owing to use the great majority of ADSL to be the domestic consumer, environment for use is very complicated, and the electromagnetic interference of various household electrical appliance is very serious.The copper circuit that is used for the ADSL transmission is subjected to the influence of impulsive noise easily, and these noises are normally caused by electromagnetic interference.Impulsive noise can cause cyclic check, and (Cyclic Redundancy Check, CRC) mistake reduce throughput, and require adjustment adsl line again.Provide the operator of IPTV service or ADSL service can pay much attention to this problem naturally, hope can avoid the IPTV television broadcasting to be subjected to this type of interference of noise.The existing coding techniques of ADSL provides some anti-disturbance methods, for example: discrete multichannel (discrete multi tone) technology, it just has good antijamming capability, it can dynamically adjust the transmission rate of subchannel according to the situation of actual track and external environmental interference, so not only guarantee the high speed of transmission data but also guaranteed its integrality, but this coding techniques only is effective at circuit intrinsic noise or decay, can not work for the impulsive noise that happens suddenly.

Summary of the invention

The method and apparatus that the object of the present invention is to provide a kind of anti-impulsive noise to disturb, so that can play effective inhibitory action to sporadic impulse noise, technical scheme is as follows:

The method that a kind of anti-impulsive noise is disturbed comprises:

Obtain carrier wave original static line noise;

Calculate virtual static line noise according to the described original static line noise of obtaining;

Send described virtual static line noise to local side digital subscriber line access multiplex equipment.

Further, during diagnostic mode or circuit initialization, obtain carrier wave original static line noise.

Further, the step of calculating virtual static line noise according to the described original static line noise of obtaining comprises:

Utilize original static line noise QLN (i * Δ f) to obtain averaged static circuit noise QLN (A) according to formula (1):

$\mathrm{QLN}\left(A\right)=\left(\underset{i=0}{\overset{\mathrm{NSC}-1}{\mathrm{\Σ}}}\mathrm{QLN}(i\×\mathrm{\Δf})\right)\÷\mathrm{NSC}---\left(1\right);$

Utilize described averaged static circuit noise QLN (A) to obtain virtual static line noise QLN (i) according to formula (2):

if QLN(i×Δf)≤QLN(A)

QLN(i)＝QLN(A)

else?QLN(i)＝QLN(i×Δf) (2)；

Wherein, static line noise QLN (i * Δ f) is the signless Integer n (i) of one 8 bit, and i is the sequence number of subcarrier, and i=0 is to NSC-1, the value of QLN (i * Δ f) be QLN (i * Δ f)=-23-(n (i)/2) dBm/Hz.

Further, the ADSL (Asymmetric Digital Subscriber Line) management entity to veneer sends described virtual static line noise.

The device that a kind of anti-impulsive noise is disturbed comprises:

Acquiring unit is used to obtain carrier wave original static line noise;

Computing unit is used for calculating virtual static line noise according to the described original static line noise of obtaining;

Transmitting element is used for sending described virtual static line noise to local side digital subscriber line access multiplex equipment.

Further, described acquiring unit specifically is used for obtaining carrier wave original static line noise during diagnostic mode or circuit initialization.

Further, described computing unit specifically is used for

Utilize original static line noise QLN (i * Δ f) to obtain averaged static circuit noise QLN (A) according to formula (1):

$\mathrm{QLN}\left(A\right)=\left(\underset{i=0}{\overset{\mathrm{NSC}-1}{\mathrm{\Σ}}}\mathrm{QLN}(i\×\mathrm{\Δf})\right)\÷\mathrm{NSC}---\left(1\right);$

Utilize described averaged static circuit noise QLN (A) to obtain virtual static line noise QLN (i) according to formula (2):

if QLN(i×Δf)≤QLN(A)

QLN(i)＝QLN(A)

else QLN(i)＝QLN(i×Δf) (2)；

Wherein, static line noise QLN (i * Δ f) is the signless Integer n (i) of one 8 bit, and i is the sequence number of subcarrier, and i=0 is to NSC-1, the value of QLN (i * Δ f) be QLN (i * Δ f)=-23-(n (i)/2) dBm/Hz.

Further, described transmitting element also is used for sending described virtual static line noise to the ADSL (Asymmetric Digital Subscriber Line) management entity.

Because the static line noise of ADSL all is linear decline along with the rising of frequency, and the high more easy more impulsive noise that is subjected to of frequency disturbs, so the present invention is by obtaining carrier wave original static line noise; Calculate virtual static line noise according to the original static line noise of obtaining; Send virtual static line noise to local side DSLAM equipment, can realize that frequency is high more, and the signal to noise ratio surplus (Signal toNoise Ratio Margin, SNRM) big more, can more effective opposing noise jamming.

Description of drawings

The flow chart of the method that Fig. 1 disturbs for the anti-impulsive noise that the embodiment of the invention provides;

The schematic diagram of the original static line noise QLN that Fig. 2 provides for the embodiment of the invention (f);

Fig. 3 is the schematic diagram of the virtual static line noise that provides of the embodiment of the invention;

The schematic representation of apparatus that Fig. 4 disturbs for the anti-impulsive noise that the embodiment of the invention provides.

Embodiment

Core concept of the present invention is: because the static line noise of ADSL all is linear decline along with the rising of frequency, and the high more easy more impulsive noise that is subjected to of frequency disturbs, so the present invention is by obtaining carrier wave original static line noise; Calculate virtual static line noise according to this original static line noise of obtaining; Send this virtual static line noise to local side DSLAM equipment, can realize that frequency is high more, the signal to noise ratio surplus is big more, can more effective opposing noise jamming.

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in detail.

The method that the embodiment of the invention provides a kind of anti-impulsive noise to disturb as shown in Figure 1, comprising:

Step 101 is obtained carrier wave original static line noise.

The calculating of static line noise was carried out before the ADSL veneer is set up link with local side apparatus.When diagnostic mode or initialization, also there is not signal on the adsl line, this moment, veneer was measured the noise of adsl line, and the original static line noise QLN that measures (f) is as shown in Figure 2.

(Power spectrum density, PSD) QLN (i * Δ f) must be expressed as the signless Integer n (i) of one 8 bit to static line noise energy frequency spectrum density.Here i is the sequence number of subcarrier, and the i value is 0 to NSC-1, and the NSC value depends on the mode of operation of ADSL.The value of QLN (i * Δ f) must be defined as QLN (i * Δ f)=-23-(n (i)/2) dBm/Hz.

Step 102 is calculated virtual static line noise according to the static line noise of obtaining.

Particularly, according to original static line noise, utilize formula (1) to calculate the averaged static circuit noise, formula (1) is as follows:

$\mathrm{QLN}\left(A\right)=\left(\underset{i=0}{\overset{\mathrm{NSC}-1}{\mathrm{\Σ}}}\mathrm{QLN}(i\×\mathrm{\Δf})\right)\÷\mathrm{NSC}---\left(1\right)$

According to the averaged static circuit noise, utilize formula (2) to calculate virtual static line noise QLN (i), algorithm is:

if QLN(i×Δf)≤QLN(A)

QLN(i)＝QLN(A)

else QLN(i)＝QLN(i×Δf) (2)

Wherein, virtual static line noise QLN (i) as shown in Figure 3.

Step 103 sends this virtual static line noise to local side apparatus.

Calculate virtual static line noise QLN (i) afterwards, the ADSL veneer sends to local side digital subscriber line access multiplex (Digital Subscriber Line AccessMultiplexer with virtual static line noise QLN (i), DSLAM) equipment, and must it be sent to the ADSL management entity of veneer according to the request of ADSL management entity.The ADSL management entity must according to the request of local side DSLAM equipment, send to local side DSLAM equipment with QLN (i) during transmitting data.

Like this, after virtual static line noise offers local side DSLAM equipment by veneer, because the HFS veneer is reported to the noise ratio of local side apparatus higher, to distribute to the bit of these passages just few for local side so, and in fact, the noise of these passages is so not high, that is to say that the noise margin of HFS has increased, the passage that these were disturbed by impulsive noise easily originally, antijamming capability has just been strengthened.

Based on the inventive concept identical with method, the device that the embodiment of the invention provides a kind of anti-impulsive noise to disturb as shown in Figure 4, comprising:

Acquiring unit is used to obtain carrier wave original static line noise;

Computing unit is used for calculating virtual static line noise according to this original static line noise of obtaining;

Transmitting element is used for sending this virtual static line noise to local side digital subscriber line access multiplex equipment.

Further, this acquiring unit specifically is used for obtaining carrier wave original static line noise during diagnostic mode or circuit initialization.

Further, this computing unit specifically is used for

Utilize original static line noise QLN (i * Δ f) to obtain averaged static circuit noise QLN (A) according to formula (1):

$\mathrm{QLN}\left(A\right)=\left(\underset{i=0}{\overset{\mathrm{NSC}-1}{\mathrm{\Σ}}}\mathrm{QLN}(i\×\mathrm{\Δf})\right)\÷\mathrm{NSC}---\left(1\right);$

Utilize this averaged static circuit noise QLN (A) to obtain virtual static line noise QLN (i) according to formula (2):

if QLN(i×Δf)≤QLN(A)

QLN(i)＝QLN(A)

else QLN(i)＝QLN(i×Δf) (2)；

Wherein, static line noise QLN (i * Δ f) is the signless Integer n (i) of one 8 bit, and i is the sequence number of subcarrier, and i=0 is to NSC-1, the value of QLN (i * Δ f) be QLN (i * Δ f)=-23-(n (i)/2) dBm/Hz.

Further, this transmitting element also is used for sending this virtual static line noise to the ADSL (Asymmetric Digital Subscriber Line) management entity.

Because the static line noise of ADSL all is linear decline along with the rising of frequency, and the high more easy more impulsive noise that is subjected to of frequency disturbs, so the present invention is by obtaining carrier wave original static line noise; Calculate virtual static line noise according to the described original static line noise of obtaining; Send described virtual static line noise to local side DSLAM equipment, can realize that frequency is high more, the signal to noise ratio surplus is big more, can more effective opposing noise jamming, help professional popularization.

Above-mentioned explanation has illustrated and has described the present invention at a preferred embodiment that detects frame wiring system, but as previously mentioned, be to be understood that the present invention is not limited to the disclosed form of this paper, should not regard eliminating as to other embodiment, and can be used for various other combinations, modification and environment, and can in invention contemplated scope described herein, change by the technology or the knowledge of above-mentioned instruction or association area.And change that those skilled in the art carried out and variation do not break away from the spirit and scope of the present invention, then all should be in the protection range of the appended claim of the present invention.

Claims (8)

1. the method that anti-impulsive noise is disturbed is characterized in that, comprising:

Obtain carrier wave original static line noise;

Calculate virtual static line noise according to the described original static line noise of obtaining;

Send described virtual static line noise to local side digital subscriber line access multiplex equipment.

2. the method for claim 1 is characterized in that, obtains carrier wave original static line noise during diagnostic mode or circuit initialization.

3. the method for claim 1 is characterized in that, the step of calculating virtual static line noise according to the described original static line noise of obtaining comprises:

Utilize original static line noise QLN (i * Δ f) to obtain averaged static circuit noise QLN (A) according to formula (1):

$\mathrm{QLN}\left(A\right)=\left(\underset{i=0}{\overset{\mathrm{NSC}-1}{\mathrm{\Σ}}}\mathrm{QLN}(i\×\mathrm{\Δf})\right)\÷\mathrm{NSC}---\left(1\right);$

Utilize described averaged static circuit noise QLN (A) to obtain virtual static line noise QLN (i) according to formula (2):

if QLN(i×Δf)≤QLN(A)

QLN(i)＝QLN(A)

else?QLN(i)＝QLN(i×Δf)(2)；

Wherein, static line noise QLN (i * Δ f) is the signless Integer n (i) of one 8 bit, and i is the sequence number of subcarrier, and i=0 is to NSC-1, the value of QLN (i * Δ f) be QLN (i * Δ f)=-23-(n (i)/2) dBm/Hz.

4. the method for claim 1 is characterized in that, also comprises: the ADSL (Asymmetric Digital Subscriber Line) management entity to veneer sends described virtual static line noise.

5. the device that anti-impulsive noise is disturbed is characterized in that, comprising:

Acquiring unit is used to obtain carrier wave original static line noise;

Computing unit is used for calculating virtual static line noise according to the described original static line noise of obtaining;

Transmitting element is used for sending described virtual static line noise to local side digital subscriber line access multiplex equipment.

6. device as claimed in claim 5 is characterized in that, described acquiring unit specifically is used for obtaining carrier wave original static line noise during diagnostic mode or circuit initialization.

7. device as claimed in claim 5 is characterized in that described computing unit specifically is used for

Utilize original static line noise QLN (i * Δ f) to obtain averaged static circuit noise QLN (A) according to formula (1):

$\mathrm{QLN}\left(A\right)=\left(\underset{i=0}{\overset{\mathrm{NSC}-1}{\mathrm{\Σ}}}\mathrm{QLN}(i\×\mathrm{\Δf})\right)\÷\mathrm{NSC}---\left(1\right);$

Utilize described averaged static circuit noise QLN (A) to obtain virtual static line noise QLN (i) according to formula (2):

if QLN(i×Δf)≤QLN(A)

QLN(i)＝QLN(A)

else?QLN(i)＝QLN(i×Δf)(2)；

Wherein, static line noise QLN (i * Δ f) is the signless Integer n (i) of one 8 bit, and i is the sequence number of subcarrier, and i=0 is to NSC-1, the value of QLN (i * Δ f) be QLN (i * Δ f)=-23-(n (i)/2) dBm/Hz.

8. device as claimed in claim 5 is characterized in that, described transmitting element also is used for sending described virtual static line noise to the ADSL (Asymmetric Digital Subscriber Line) management entity.

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