CN102739345A - Device for narrowband interference detection of explorer frame and BCH decoding combined application and method thereof - Google Patents
Device for narrowband interference detection of explorer frame and BCH decoding combined application and method thereof Download PDFInfo
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Abstract
The invention discloses a device for narrowband interference detection of an explorer frame and BCH decoding combined application of a HINOC system and a method thereof. A narrowband interference detection module is added between an OFDM demodulation module and a BCH decoding processing module at a HINOC system receiving terminal. The narrowband interference detection module detects the presence of narrowband interference in the system, and the BCH decoding processing module carries out corresponding processing according to output information of the narrowband interference detection module. According to the device and the method, improvement is carried out based on the explorer frame and a BCH error correction code scheme of the HINOC system, the capacity of narrowband interference resistance of the HINOC system is raised further, and the normal operation of the system in a strong narrowband interference environment is ensured.
Description
Technical field
The present invention relates to high-performance coaxial network (HINOC) access technology field, particularly relate to a kind of narrow band interference and detect the device that combines application with the BCH decoding to HINOC system explore frame based on coaxial cable.The invention still further relates to a kind of narrow band interference and detect the method that combines application with the BCH decoding to HINOC system explore frame.
Prior art
HINOC technology [The State Administration of Radio, Film and Television Broadcasting Institute of Science and Technology etc.: " high-performance coaxial cable access network (HINOC) physical layer transmission pattern and medium access control protocol (towards the proposed projects of NGB cable access technology) ", 2010.] is a kind of high performance wideband access technology of utilizing coaxial cable to carry out bidirectional data transfers.The HINOC system adopts CP-OFDM (Cyclic Prefix OFDM) modulation system, and high-speed serial data is decomposed and is modulated on a plurality of parallel low speed orthogonal sub-carriers.Because the orthogonality between the subcarrier, the ofdm signal frequency spectrum allows stack, makes its availability of frequency spectrum improve a lot than single-carrier system.In addition, because the phase mutual interference between the OFDM symbol of front and back has been isolated in the use of Cyclic Prefix, make it have good anti-multipath interference performance; The bandwidth of each subcarrier is all very little, and the channel that is experienced can be similar to regards non-frequency-selective channel as, therefore greatly reduces the complexity of equilibrium treatment.On the other hand, compare with single-carrier system, also there are some shortcomings in ofdm system, as exists higher peak-to-average power to compare, be subject to the influence of carrier wave frequency deviation and narrow band interference etc.
Narrow band interference is prevalent in the communication system, is very easy to produce, and power spectral density is high, is a very important interference source.Wherein, single-frequency is disturbed a kind of special case that can be regarded as narrow band interference.In ofdm system; When strong narrow band interference acts on the signal; Since the spectrum leakage effect that receiving terminal FFT conversion brings, the energy leakage of narrow band interference frequency spectrum secondary lobe (particularly when the subcarrier of narrow band interference and OFDM is nonopiate), a plurality of subcarriers of influence in very big bandwidth range; Cause the signal to noise ratio of output signal near the subcarrier of narrow band interference sharply to descend, have a strong impact on the performance of ofdm system.
Four kinds of frames of HINOC system physical layer transmission are respectively: descending explore frame (Pd frame), uplink detection frame (Pu frame), downlink data frame (Dd frame) and uplink data frames (Du frame).Wherein, Frame (Dd frame, Du frame) is used for transmission system upper layer data information, and its modulation system has plurality of optional, can carry out Adaptive Modulation according to concrete environment; Explore frame transmits signaling information, and its modulation system adopts DQPSK (difference four is modulated mutually) mode.Because the coaxial cable channel compares better; In order to improve the availability of frequency spectrum to greatest extent; Pilot tone is not set in the HINOC system, and the OFDM symbol that the Synchronous Processing of system receiving terminal and channel training etc. all are based on the explore frame frame usually adopts decision-directed algorithm to carry out.If occur more error code in the explore frame,, cause receiving terminal can't carry out correct channel training, thereby cause system can't set up initial synchronisation because error propagation (Error Propagation) effect can have a strong impact on the performance of decision-directed algorithm.Further, access terminal equipment must correctly be decoded to the signaling information that carries in the descending explore frame, can correctly obtain system broadcast information, thereby communicates to connect normally with Centroid foundation.If occur error code in the explore frame, accessing terminal to set up to communicate by letter normally with Centroid is connected, and therefore can't realize network insertion.
When having stronger narrow band interference in the system, the entrained signal of the subcarrier of corresponding frequency is submerged in the interference signal fully, and the signal to noise ratio of corresponding subcarrier and adjacent subcarrier all can sharply descend, and error code appears in the data symbol that causes being transmitted.In existing HINOC technical scheme, Frame can resist narrow band interference effectively through adaptive modulation system (adopt low-order-modulated mode or shielding to receive interfering sub-carrier to receiving interfering sub-carrier, add the error correcting code protection mechanism).But explore frame can't adopt Adaptive Modulation mechanism, does not also have the error correcting code protection mechanism, though the modulation system of DQPSK can be resisted interference to a certain extent, when serious interference, explore frame still more error code can occur, and system at all can't operate as normal.Can find out that the power of explore frame antagonism narrow band interference ability has crucial influence to the normal operation of HINOC system.
BCH code is a kind of widely accepted Error-Control Coding.It is found in nineteen sixty by Hocquenghem, Bose, Chandhari, belongs to the subclass of cyclic code.This yard is based on the algebraic process of strictness, and error correcting capability is controlled, and generator polynomial g (x) and minimum range d have substantial connection, can construct the sign indicating number with predetermined error correcting capability according to d.The BCH coding and decoding circuit is simpler, and the performance under short-and-medium code length situation is near theoretical optimal value, and Application of B CH error correcting code can improve system reliability significantly in communication system.
Summary of the invention
The technical problem that the present invention will solve provides a kind of Narrow-Band Interference to HINOC system explore frame and detects the device that combines application with the BCH decoding; HINOC system explore frame is being added on the basis of Bose-Chaudhuri Hocquenghem error correction codes; Further improve the anti-Narrow-Band Interference ability of HINOC system, to guarantee the normal operation of system under strong Narrow-Band Interference environment; The present invention also will provide a kind of Narrow-Band Interference to HINOC system explore frame to detect with the BCH decoding and combine the method for using for this reason.
For solving the problems of the technologies described above, the narrow band interference that the present invention is directed to HINOC system explore frame detects the device that combines application with the BCH decoding, includes OFDM demodulation module and BCH decoding process module at the HINOC system receiving terminal; Wherein, also comprise the narrow band interference detection module, the input of this narrow band interference detection module is connected with the output of OFDM demodulation module; Its output is connected with the input of BCH decoding process module; Be used to calculate the power of the frequency-region signal of said OFDM demodulation module output, and the judging threshold of the performance number that calculates and setting is compared, confirm according to the result of comparison whether system exists narrow band interference; If exist, then provide the particular location of narrow band interference; Said BCH decoding process module is done handled according to the output information of narrow band interference detection module.
Said narrow band interference to HINOC system explore frame detects the method that combines application with the BCH decoding, comprises the steps:
The power of the frequency-region signal of step 1, the output of calculating OFDM demodulation module obtains the current subcarrier transmitted signal power value P of institute
i, the object that once calculates is transmitted number an of number of sub-carrier;
Existing HINOC system has adopted the BCH encoding and decoding to Frame, and provides 3 kinds of coding modes adapting to different application environments, and existing system does not adopt the BCH encoding and decoding to explore frame.For this reason, (application number: 201010614121.7), this method can improve the ability of HINOC system antagonism narrow band interference greatly in the application for a patent for invention that the applicant once proposed a kind of " method that the explore frame of HINOC system is added Bose-Chaudhuri Hocquenghem error correction codes ".The present invention is on the basis of this application for a patent for invention; Further provide a kind of narrow band interference to HINOC system explore frame to detect the apparatus and method that combine application with the BCH decoding, said BCH decoding process module is optimized decoding according to the detected narrow band interference positional information of narrow band interference detection module and handles.If there is not narrow band interference, the BCH decoding process module is not done special processing, carries out conventional BCH decoding; If there is narrow band interference, according to the particular location of narrow band interference, the n Bit data that is transmitted to respective sub and plurality of adjacent subcarrier constituted 2
nPlant combination and carry out ergodic BCH decoding, choose correct decoded result according to the CRC check result at last.Therefore, the present invention can further improve the anti-narrow band interference ability of HINOC system, solves the problem that the HINOC system can't operate as normal under strong narrow band interference environment.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Fig. 1 has adopted explore frame of the present invention to send, receive the signal processing block diagram;
Fig. 2 is narrow band interference detection module one an example structure block diagram;
Fig. 3 is the Boxcar Filter basic model block diagram that the present invention adopts;
Fig. 4 has adopted narrow band interference of the present invention to detect the flow chart that combines application with the BCH decoding.
Embodiment
The device and method that the narrow band interference to HINOC system explore frame that the present invention proposes detects and BCH decoding combination is used; It is conceived basically; In receiving processing, carry out narrow band interference earlier and detect, and then determine whether to carry out ergodic BCH decoding processing based on the narrow band interference testing result.
Shown in Figure 1 is to handle block diagram based on the explore frame signal transmitting and receiving of HINOC modulator-demodulator of the present invention.As shown in Figure 1, between the OFDM of system receiving terminal demodulation module and BCH decoding process module, insert the narrow band interference detection module; Whether there is narrow band interference in the narrow band interference detection module detection system; The BCH decoding process module detects resulting narrow band interference positional information according to narrow band interference and carries out ergodic decoding processing.
In one embodiment; Said narrow band interference detection module block diagram is as shown in Figure 2; This narrow band interference detection module calculates the power of OFDM demodulation module output signal, and performance number that calculates and judging threshold are compared, and confirms according to result relatively whether system exists narrow band interference; If exist, then provide the particular location of narrow band interference.
In conjunction with shown in Figure 2, said narrow band interference detection module comprises:
The signal power computing module, the frequency-region signal that said OFDM demodulation module is exported carries out power calculation, obtains the current subcarrier transmitted signal power value P of institute
iThe object that once calculates is transmitted number an of number of sub-carrier.
The thresholding setting module is connected with said signal power computing module, according to the power of adjacent sub-carriers signal, sets the threshold T of current subcarrier dynamically
i
The thresholding comparison module is connected with the thresholding setting module with said signal power computing module, with the performance number P of current subcarrier institute transmission signals
iWith threshold T
iCompare, travel through current all subcarriers, if P
i＜T
i, show then not have narrow band interference on the i number of sub-carrier that follow-up BCH decoding process module is not done special processing, carries out the routine decoding; If P
i＞T
i, then show to have narrow band interference on the i number of sub-carrier, calculate near the ratio R of the average power content of the n number of sub-carrier institute transmission signals current subcarrier signals performance number and the current subcarrier
i=P
i/ Q
i, store the R of current subcarrier
iValue and sequence number travel through all subcarriers, successively with the R of all storages
iValue compares, preceding m maximum R
iBe worth pairing subcarrier sequence number and be the position at m the actual place of narrow band interference.Wherein, the once handled number of sub carrier wave of traversal is the actual used subcarrier number of an OFDM symbol.
In conjunction with shown in Figure 2, said thresholding setting module comprises:
Average power is calculated module, is used to choose near the n number of sub-carrier of current subcarrier, calculates the average power of this n number of sub-carrier institute transmission signals.
Multiplier calculates module with said average power and is connected, and average power is calculated the average power that module calculates multiply by a suitable thresholding factor K, obtains the threshold value of current subcarrier.
The threshold value module is connected with multiplier, and said threshold value is exported to the thresholding comparison module.
The calculating of average power is with reference to the thought of Boxcar Filter (square wave filter); Choose several number of sub-carrier of current subcarrier left and right sides equidistance; Ask this several subcarrier signals average powers, said average power signal multiply by the threshold value that a thresholding factor can obtain current subcarrier.If average power content is Q
i, the thresholding factor is K, then threshold T
i=Q
i* K.The model framework chart of Boxcar Filter is as shown in Figure 3; Its basic thought is: if to calculate average power be example to choose 4 number of sub-carrier; The power addition that will be positioned at transmitted number of the subcarrier of-3 ,-2,2,3 four points asks average divided by 4, does not participate in computing and be positioned at-1,0,1 three subcarrier.Wherein 0 position is current subcarrier position.
The basic handling method of said BCH decoding process module is referring to another application for a patent for invention " method that the explore frame of HINOC system is added Bose-Chaudhuri Hocquenghem error correction codes " (application number: 201010614121.7) of the applicant.On this basis, the narrow band interference positional information that obtains according to the narrow band interference detection module of the decoding process module of BCH described in the present invention is optimized decoding and handles.If there is not narrow band interference, the BCH decoding process module is not done special processing, carries out the routine decoding; If there is narrow band interference, according to the particular location of narrow band interference, the n Bit data that is transmitted to respective sub and plurality of adjacent subcarrier constituted 2
nPlant combination and carry out ergodic BCH decoding, choose correct decoded result according to the CRC check result at last.Transmitting 2 Bit datas with a pairing number of sub-carrier of narrow band interference is example, 4 (2 of said 2 Bit datas composition
2) plant and to be combined as 00,01,10,11}, the BCH decoder module travels through above-mentioned 4 kinds of combinations, chooses correct decoded result according to the CRC check result at last and carries out subsequent treatment.Idiographic flow can be referring to shown in Figure 4.
Flow process after the BCH decoding processing repeats no more at this for existing HINOC system convention handling process.
With reference to shown in Figure 1, detect the device and method that combines application with the BCH decoding according to the narrow band interference to HINOC system explore frame provided by the present invention, its explore frame signal sends, receives flow process and is described below.
At transmitting terminal, system sends to a series of processing of information via that the upper strata provides on the channel;
At receiving terminal; The channel signal that system receives at first handles through AFE(analog front end) or radio frequency processing converts base band or analog intermediate frequency signal to; Convert digital signal to through analog-to-digital conversion process then; Deflection correction when handling (optional), correcting frequency deviation through Digital Down Convert again, filtering, synchronously, after down-sampling and automatic gain control etc. handle, carry out the OFDM demodulation.OFDM restituted signal one tunnel provides narrow band interference information to the BCH decoding process module through narrow band interference detection module (being " the single-frequency Interference Detection " among Fig. 1); One the tunnel carries out equilibrium and DQPSK demodulation etc.; Recover initial data through steps such as BCH decoding processing, descrambling and removal protected fields again; Detect in the packet whether have errored bit information through CRC check at last, and the data that recover are offered the upper strata handle.
For making those skilled in the art better understand the present invention, below in conjunction with specific embodiment the narrow band interference to HINOC system explore frame provided by the invention is detected the device and method that combines to use with the BCH decoding and does bright specifically:
Suppose to have a narrow band interference in the system, the narrow band interference detection module is launched by the HINOC system, adopts Bose-Chaudhuri-Hocquenghem Code pattern 1 to send descending explore frame (PD frame).
In the present embodiment, the related procedure of handling is handled and received in the transmission of PD frame be described below.Note; Succinct for what describe here; Only describe with regard to narrow band interference detection module and the relevant processing of BCH decoding process module; (application number: 201010614121.7), the engineer that needed processing should be this area in other the modulator-demodulator knows the basic handling method of BCH decoding process module, repeats no more here referring to another application for a patent for invention " method that the explore frame of HINOC system is added Bose-Chaudhuri Hocquenghem error correction codes " of the applicant.
HINOC agreement regulation, system is to explore frame The data DQPSK modulation system, and each subcarrier transmits 2 Bit datas.One frame PD frame carries the information of 2 OFDM symbols, and the actual used sub-carrier number of OFDM symbol is 210.
1.1, the calculating of signal power.
Calculate the power P of OFDM demodulated output signal
i, wherein i is the subcarrier sequence number, i=1,2 ... 210.The object that the once-through operation of signal power computing module is handled is a number of sub-carrier institute transmission signals.
1.2, the calculating of thresholding.
Utilize the thought of Boxcar Filter, choose near 4 number of sub-carrier of the left and right sides equidistance current subcarrier, calculate the average power Q of transmitted number of this 4 number of sub-carrier
i, Q
i=(P
I-3+ P
I-2+ P
I+2+ P
I+3)/4 (wherein i is the sequence number of current subcarrier), and this average power P multiply by a thresholding factor K, obtain threshold T
i=Q
i* K.Wherein environment is relevant under the setting of thresholding factor K value and the current system, can suitably regulate to make and adopt this threshold value can correctly detect narrow band interference, and prevent false-alarm.
1.3, thresholding relatively.
Signal power P with the i number of sub-carrier
iWith threshold T
iCompare, travel through 210 number of sub-carrier successively, if P
i＜T
i, there is not narrow band interference in the system, the BCH decoding process module is follow-up does not do special processing; If there is P
i＞T
i, show that there is stronger narrow band interference in system near the corresponding frequency of i number of sub-carrier, calculate the ratio R of current subcarrier signals performance number and average power content
i=P
i/ Q
i, store the R of current subcarrier
iValue and sequence number travel through 210 number of sub-carrier, successively with the R of all storages
iValue compares, maximum R
iBe worth pairing subcarrier sequence number and be the position at the actual place of the current narrow band interference that detects.
1.4, the BCH decoding processing
The BCH decoding process module detects the narrow band interference positional information that obtains according to narrow band interference and is optimized the decoding processing.If there is not narrow band interference, the BCH decoding process module is not done special processing, carries out conventional BCH decoding; If there is narrow band interference, according to the particular location of narrow band interference, preset respectively being decided to be of 2 Bit datas that respective sub is transmitted 00,01,10,11} carries out four ergodic BCH decodings, chooses correct decoded result according to the CRC check result at last.If on other subcarrier, there is not the bit mistake, a kind of correct result that is must be arranged in the decoded result of then above four BCH decoding gained, its CRC check result should be OK.
Narrow band interference to HINOC system explore frame provided by the invention detects the concrete control flow of device that combines to use with the BCH decoding can be referring to shown in Figure 4.The data of OFDM demodulation output are carried out equilibrium and DQPSK demodulation process by old process on the one hand, send data to the BCH decoder module again; The dateout of OFDM demodulation obtains whether existing in the system information of narrow band interference through the narrow band interference detection module on the other hand, and this information is offered the BCH decoding process module.If no narrow band interference, the dateout of DQPSK demodulation directly gets into the BCH decoder module and carries out the BCH decoding processing, does not follow-uply also do special processing; If there is narrow band interference; In the dateout of DQPSK demodulation, find 2 Bit datas that transmitted with the corresponding subcarrier of interference position; This 2 Bit data is set as successively 00,01,10, one of 11}4 kind compound mode; The data of other positions are not made change, send into the BCH decoder module and carry out the ergodic decoding, choose correct decoded result according to the CRC check result at last and carry out subsequent treatment.
Adopt the device and method that the narrow band interference to explore frame provided by the invention detects and BCH decoding combination is used; Under the ideal communication channel that has 12MHZ, 12.03MHZ, 20MHZ, 20.03MHZ arrowband, adopt PD frame (descending explore frame), 1 pair of system of Bose-Chaudhuri-Hocquenghem Code pattern to carry out emulation.Those skilled in the art will appreciate that under the condition of same FER (C/I: the ratio of signal power and interference power) low more, the antijamming capability of representative system is strong more for carrier/interface ratio.When the narrow band interference position is 12MHz and 20MHz, disturb the centre frequency position that acts on certain subcarrier just, can be referred to as the quadrature narrow band interference; Correspondingly, the narrow band interference position is the centre frequency position that 12.03MHz and 20.03MHz have departed from subcarrier, can be referred to as nonopiate narrow band interference.Narrow band interference under the both of these case is different to the influence degree of system.From simulation result,, when FER is the 1.00E-04 order of magnitude, detect the scheme of comparing conventional BCH decoding with the scheme of BCH decoding, the about 1dB of anti-narrow band interference performance improvement in conjunction with narrow band interference when the narrow band interference position is 12MHz and 20MHz.When the narrow band interference position is 12.03MHz and 20.03MHz, when FER is the 1.00E-04 order of magnitude, detect the scheme of comparing conventional BCH decoding with the scheme of BCH decoding, the about 3dB of anti-narrow band interference performance improvement in conjunction with narrow band interference.This shows that scheme provided by the invention can effectively be improved the anti-narrow band interference performance of HINOC system.
Though be that example describes with the situation of having only a narrow band interference and a number of sub-carrier to transmit 2 bit informations in the explanation more than, the engineers and technicians of this area should be understood that method of the present invention can expand to naturally and exist a plurality of narrow band interference, each subcarrier to transmit the situation greater than 2 bits.Such as, suppose that there be M narrow band interference in system's maximum, each subcarrier transmits the X Bit data, then in aforementioned narrow band interference testing process, gets M maximum Ri, and its correspondence position is the position at M the actual place of narrow band interference.In the decoding of BCH ergodic, need carry out M*2 then
xInferior decoding operation, and from this M*2
xHandle one group of data confirming that decoding is correct according to CRC in the inferior decoding operation.
Combine specific embodiment that the present invention has been carried out detailed explanation above; But the present invention is not restricted to the foregoing description; Under the spirit that does not break away from claim of the present invention; Any modification that those skilled in the art did, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the narrow band interference to HINOC system explore frame detects the device that combines application with the BCH decoding; Include the OFDM demodulation module and the BCH decoding process module is characterized in that at the HINOC system receiving terminal: also comprise the narrow band interference detection module; Its input is connected with the output of OFDM demodulation module, and its output is connected with the input of BCH decoding process module; Be used to calculate the power of the frequency-region signal of said OFDM demodulation module output; And the judging threshold of performance number that calculates and setting compared; Confirm according to result relatively whether system exists narrow band interference,, then provide the particular location of narrow band interference if exist; Said BCH decoding process module is done handled according to the output information of narrow band interference detection module.
2. device as claimed in claim 1 is characterized in that, said narrow band interference detection module comprises:
The signal power computing module, the frequency-region signal that said OFDM demodulation module is exported carries out power calculation, obtains the current subcarrier transmitted signal power value P of institute
iThe object that once calculates is transmitted number an of number of sub-carrier;
The thresholding setting module is connected with said signal power computing module, according to the power of adjacent sub-carriers signal, sets the threshold T of current subcarrier dynamically
i
The thresholding comparison module is connected with the thresholding setting module with said signal power computing module, with the current subcarrier transmitted signal power value P of institute
iWith threshold T
iCompare, travel through current all subcarriers, if P
i＜T
i, then show not have narrow band interference on the i number of sub-carrier; If P
i＞T
i, then show to have narrow band interference on the i number of sub-carrier; Calculate current subcarrier signals performance number P
iAverage power content Q with near the current subcarrier n number of sub-carrier institute transmission signals
iRatio R
i=P
i/ Q
i, store the R of current subcarrier
iValue and sequence number travel through all subcarriers, successively with the R of all storages
iValue compares, preceding m maximum R
iBe worth pairing subcarrier sequence number and be the position at m the actual place of narrow band interference, m is the positive integer more than or equal to 1.
3. device as claimed in claim 2 is characterized in that: traveling through once handled number of sub carrier wave is the actual used subcarrier number of an OFDM symbol.
4. device as claimed in claim 2 is characterized in that, said thresholding setting module comprises:
Average power is calculated module, is used to choose near the n number of sub-carrier of current subcarrier, calculates the average power of this n number of sub-carrier institute transmission signals;
Multiplier calculates module with said average power and is connected, and average power is calculated the average power that module calculates multiply by a thresholding factor K, obtains the threshold T of current subcarrier
i
The threshold value module is connected with multiplier, with said threshold T
iExport to the thresholding comparison module.
5. according to claim 1 or claim 2 device is characterized in that: if there is narrow band interference, according to the particular location of narrow band interference, with respective sub pass the n Bit data be preset to binary value represent non-repetitive 2
nPlant one of combination and carry out the BCH decoding, the BCH decoder module travels through above-mentioned 2
nPlant combination, choose correct decoded result according to the CRC check result at last.
6. the narrow band interference to HINOC system explore frame detects the method that combines application with the BCH decoding, it is characterized in that, comprises the steps:
The power of the frequency-region signal of step 1, the output of calculating OFDM demodulation module obtains the current subcarrier transmitted signal power value P of institute
i, the object that once calculates is transmitted number an of number of sub-carrier;
Step 2, with the performance number P that calculates
iWith the judging threshold T that sets
iCompare, confirm according to result relatively whether system exists narrow band interference,, then provide the particular location of narrow band interference if exist;
Step 3, BCH decoding process module are done corresponding according to the output information of narrow band interference detection module.
7. method as claimed in claim 6 is characterized in that, whether the described definite system of step 2 exists the narrow band interference method to be: with the performance number P of current subcarrier institute transmission signals
iWith threshold T
iCompare, travel through current all subcarriers, if P
i＜T
i, then show not have narrow band interference on the i number of sub-carrier; If P
i＞T
i, then show to have narrow band interference on the i number of sub-carrier; Calculate current subcarrier signals performance number P
iAverage power content Q with near the current subcarrier n number of sub-carrier institute transmission signals
iRatio R
i=P
i/ Q
i, store the R of current subcarrier
iValue and sequence number travel through all subcarriers, successively with the R of all storages
iValue compares, preceding m maximum R
iBe worth pairing subcarrier sequence number and be the position at m the actual place of narrow band interference, m is the positive integer more than or equal to 1.
8. method as claimed in claim 7 is characterized in that: traveling through once handled number of sub carrier wave is the actual used subcarrier number of an OFDM symbol.
9. like claim 6 or 7 described methods, it is characterized in that: definite method of said threshold value is, chooses near the n number of sub-carrier the current subcarrier, calculates the average power of this n number of sub-carrier institute transmission signals; Said average power multiply by a thresholding factor K, obtain the threshold T of current subcarrier
i
10. like claim 6 or 7 described methods, it is characterized in that: if there is narrow band interference, according to the particular location of narrow band interference, with respective sub pass the n Bit data be preset to binary value represent non-repetitive 2
nPlant one of combination and carry out the BCH decoding, the BCH decoder module travels through above-mentioned 2
nPlant combination, choose correct decoded result according to the CRC check result at last.
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| WO2015054950A1 (en) * | 2013-10-14 | 2015-04-23 | 国家电网公司 | Timing synchronization method and system for power line carrier communication |
| CN111800813A (en) * | 2019-04-08 | 2020-10-20 | 大唐移动通信设备有限公司 | Method and device for detecting narrow-band signal interference |
| CN115441992A (en) * | 2022-08-31 | 2022-12-06 | 上海昂麟企业管理咨询合伙企业(有限合伙) | Data transmission interference elimination method, system, medium and terminal |
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| CN111800813A (en) * | 2019-04-08 | 2020-10-20 | 大唐移动通信设备有限公司 | Method and device for detecting narrow-band signal interference |
| CN111800813B (en) * | 2019-04-08 | 2021-10-29 | 大唐移动通信设备有限公司 | Method and device for detecting narrow-band signal interference |
| CN115441992A (en) * | 2022-08-31 | 2022-12-06 | 上海昂麟企业管理咨询合伙企业(有限合伙) | Data transmission interference elimination method, system, medium and terminal |
| CN115441992B (en) * | 2022-08-31 | 2024-07-26 | 上海昂麟企业管理咨询合伙企业(有限合伙) | Data transmission interference elimination method, system, medium and terminal |
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| CN102739345B (en) | 2014-11-05 |
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