CN101854232B - 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 of anti-impulse noise interference

Technical field

The present invention relates to the communications field, particularly a kind of method and apparatus of anti-impulse noise interference.

Background technology

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

Because the great majority that use ADSL are domestic consumer, environment for use is very complicated, and the electromagnetic interference of various household electrical appliance is very serious.Easily be subject to the impact of impulsive noise for the copper circuit of ADSL transmission, these noises are normally caused by electromagnetic interference.Impulsive noise can cause cyclic check (Cyclic Redundancy Check, CRC) mistake, reduces throughput, and requires adjustment adsl line again.Provide the operator of IPTV service or ADSL service naturally can pay much attention to this problem, hope can avoid IPTV television broadcasting to be subject to the interference of this noise like.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 according to the situation of actual track and external environmental interference the transmission rate of subchannel, so not only ensured the high speed of transmission data but also ensured its integrality, but this coding techniques is only the noise intrinsic for circuit or decays effectively, can not work for the impulsive noise of burst.

Summary of the invention

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

A method for anti-impulse noise interference, comprising:

Obtain the original static line noise of carrier wave;

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 the original static line noise of carrier wave.

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

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

A device for anti-impulse noise interference, comprising:

Acquiring unit, for obtaining the original static line noise of carrier wave;

Computing unit, calculates virtual static line noise for the original static line noise of obtaining described in basis;

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

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

Further, described computing unit, specifically for

Utilize original static line noise QLN (i × Δ f) obtains 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, (i × Δ is f) the signless Integer n (i) of 8 bits to static line noise QLN, i is the sequence number of subcarrier, i=0 is to NSC-1, QLN (i × Δ value f) be QLN (i × Δ f)=-23-(n (i)/2) dBm/Hz.

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

Because the static line noise of ADSL is all linear decline along with the rising of frequency, and the more high impulse noise interference that is more easily subject to of frequency, therefore the present invention is by obtaining the original static line noise of carrier wave; 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 frequency higher, (Signal toNoise Ratio Margin, SNRM) is larger for signal to noise ratio surplus, can more effective opposing noise jamming.

Brief description of the drawings

The flow chart of the method for the anti-impulse noise interference that Fig. 1 provides for the embodiment of the present invention;

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

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

The schematic diagram of the device of the anti-impulse noise interference that Fig. 4 provides for the embodiment of the present invention.

Embodiment

Core concept of the present invention is: because the static line noise of ADSL is all linear decline along with the rising of frequency, and the more high impulse noise interference that is more easily subject to of frequency, therefore the present invention is by obtaining the original static line noise of carrier wave; 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 frequency higher, signal to noise ratio surplus is larger, can more effective opposing noise jamming.

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

The embodiment of the present invention provides a kind of method of anti-impulse noise interference, as shown in Figure 1, comprising:

Step 101, obtains the original static line noise of carrier wave.

The calculating of static line noise was carried out before ADSL veneer establishes the link with local side apparatus.In the time of diagnostic mode or initialization, on adsl line, also there is no signal, now veneer is measured the noise of adsl line, and the original static line noise QLN (f) measuring is as shown in Figure 2.

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

Step 102, calculates virtual static line noise according to the static line noise of obtaining.

Particularly, according to original static line noise, utilize formula (1) to calculate 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 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, virtual static line noise QLN (i) is sent to local side digital subscriber line access multiplex (Digital Subscriber Line AccessMultiplexer by ADSL veneer, DSLAM) equipment, and must be according to the request of ADSL management entity, it is sent to the ADSL management entity of veneer.ADSL management entity must, during transmitting data, according to the request of local side DSLAM equipment, send to local side DSLAM equipment by QLN (i).

Like this, virtual static line noise is offered after local side DSLAM equipment by veneer, because 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, these were easily subject to the passage of impulse noise interference originally, and antijamming capability has just been strengthened.

Based on the inventive concept identical with method, the embodiment of the present invention provides a kind of device of anti-impulse noise interference, as shown in Figure 4, comprising:

Acquiring unit, for obtaining the original static line noise of carrier wave;

Computing unit, calculates virtual static line noise for the original static line noise of obtaining according to this;

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

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

Further, this computing unit, specifically for

Utilize original static line noise QLN (i × Δ f) obtains 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, (i × Δ is f) the signless Integer n (i) of 8 bits to static line noise QLN, i is the sequence number of subcarrier, i=0 is to NSC-1, QLN (i × Δ value f) be QLN (i × Δ f)=-23-(n (i)/2) dBm/Hz.

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

Because the static line noise of ADSL is all linear decline along with the rising of frequency, and the more high impulse noise interference that is more easily subject to of frequency, therefore the present invention is by obtaining the original static line noise of carrier wave; 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 frequency higher, signal to noise ratio surplus is larger, can more effective opposing noise jamming, be conducive to the popularization of business.

Above-mentioned explanation illustrates 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 disclosed form herein, should not regard the eliminating to other embodiment as, and can be used for various other combinations, amendment and environment, and can, in invention contemplated scope described herein, change by technology or the knowledge of above-mentioned instruction or association area.And the change that those skilled in the art carry out and variation do not depart from the spirit and scope of the present invention, all should be in the protection range of the appended claim of the present invention.

Claims (6)

1. a method for anti-impulse noise interference, is characterized in that, comprising:

Obtain the original static line noise of carrier wave;

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;

Wherein, 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) obtains 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×△f)≤QLN(A)

QLN(i)＝QLN(A)

else QLN(i)＝QLN(i×△f) (2)

Wherein, (i × Δ is f) the signless Integer n (i) of 8 bits to static line noise QLN, i is the sequence number of subcarrier, i=0 is to NSC – 1, and (i × Δ value f) is that (i × Δ is=– 23 – (n (i)/2) dBm/Hz f) for QLN to QLN.

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

3. 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.

4. a device for anti-impulse noise interference, is characterized in that, comprising:

Acquiring unit, for obtaining the original static line noise of carrier wave;

Computing unit, calculates virtual static line noise for the original static line noise of obtaining described in basis;

Transmitting element, for sending described virtual static line noise to local side digital subscriber line access multiplex equipment;

Wherein, described computing unit specifically for

Utilize original static line noise QLN (i × Δ f) obtains 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×△f)≤QLN(A)

QLN(i)＝QLN(A)

else QLN(i)＝QLN(i×△f) (2)

Wherein, (i × Δ is f) the signless Integer n (i) of 8 bits to static line noise QLN, i is the sequence number of subcarrier, i=0 is to NSC – 1, and (i × Δ value f) is that (i × Δ is=– 23 – (n (i)/2) dBm/Hz f) for QLN to QLN.

5. device as claimed in claim 4, is characterized in that, described acquiring unit, specifically for obtaining the original static line noise of carrier wave during diagnostic mode or circuit initialization.

6. device as claimed in claim 4, is characterized in that, described transmitting element, also for sending described virtual static line noise to ADSL (Asymmetric Digital Subscriber Line) management entity.