CN105281791A - Interference detection method in OFDM wireless communication system - Google Patents
Interference detection method in OFDM wireless communication system Download PDFInfo
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- CN105281791A CN105281791A CN201410356348.4A CN201410356348A CN105281791A CN 105281791 A CN105281791 A CN 105281791A CN 201410356348 A CN201410356348 A CN 201410356348A CN 105281791 A CN105281791 A CN 105281791A
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Abstract
The invention provides an interference detection method in an OFDM wireless communication system. The method comprises steps: 1.1, a receiving end selects multiple interference calculation methods; 1.2, a working frequency band is divided into multiple sub bands, and the receiving end calculates average interference power of each sub band through adoption of the interference calculation methods; 1.3, a channel evaluation average power of the working frequency band is calculated, and an interference power threshold is determined; 1.4, aiming at each interference calculation method, the average interference power of each sub band is compared with the interference power threshold, if the former is larger, the sub band is marks as an interfered sub band, and then marked results of the interference calculation methods are integrated then; and 1.5, the interfered sub band is removed from the original working frequency band, the working frequency band after removing is taken as a new working frequency band, the channel evaluation average power is calculated again, a new interference power threshold is determined, and, if an iteration condition is met, the step 1.4 is repeated to perform a next iteration, otherwise iterations end, and then the interference sub bands found through the previous iterations are taken as a final interference detection result.
Description
Technical field
The present invention relates to colony dispatching field, particularly relate to the interference detection method in a kind of OFDM wireless communication system.
Background technology
OFDM (OFDM) technology is widely used in wireless communications.Dividing in frequency domain is become multiple subcarrier by OFDM technology, realizes flexible allocation to frequency domain resource by choosing of sub-carrier.In ofdm communication system, receiving terminal is estimated disturbed channel by pilot tone, according to the channel estimation value of different sub carrier, calculate the power of interference and signal, after judging disturbed subcarrier, receiving terminal makes corresponding process, interfere information is indicated to transmitting terminal simultaneously and is used for interference avoidance.
In prior art, receiving terminal generally adopts single interference calculation method, the characteristic disturbed is not considered when calculating the average power of interference, but there is polytype interference in the communication environment of reality, if receiving terminal adopts single interference calculation method, or do not consider known certain interference attribute, can cause cannot estimating interference position exactly.
Summary of the invention
The object of the present invention is to provide the interference detection method in a kind of wireless communication system, dissimilar interference is detected accurately and effectively, thus ensure communication reliably.The method comprises the following steps:
1.1, receiving terminal chooses the multiple interference calculation method based on sub-carrier channels estimated value;
1.2, working band is divided into multiple subband, and receiving terminal adopts described multiple interference calculation method to calculate the average interference power of each subband successively;
1.3, the channel estimating average power in evaluation work frequency band, according to this average power determination interference power thresholding;
1.4, for often kind of interference calculation method, the average interference power of each subband in working band is compared with interference power thresholding, if the average interference power of subband exceeds interference power thresholding, then marking this subband is disturbed subband, then the mark result of comprehensive described multiple interference calculation method, finds out all disturbed subband in working band;
1.5, all disturbed subbands are removed as new working band in former working band, recalculate the channel estimating average power in working band and determine new interference power thresholding, if new interference power thresholding and former interference power thresholding meet iterated conditional, then repeat step 1.4 and carry out next iteration, otherwise iteration terminates, all interference subbands all previous iteration found out are as final interference detection results.
Preferably, known disturbances source is frequency domain continuous print broad-band interference, then step 1.5 also does further process to final interference detection results, describedly to be treated to: for often kind of interference calculation method, calculate the average interference power of the frequency range between any two disturbed subbands, if all higher than interference power thresholding, then think that this frequency range is all disturbed.
Preferably, described iterated conditional is: the difference between new interference power thresholding and former interference power thresholding is greater than predetermined value.
Preferably, described multiple interference calculation method comprises following three kinds:
One, according to difference or the quotient calculating interference of adjacent sub-carrier channel estimation value; Its two, calculate interference according to the difference of channel estimation value of two subcarriers at a distance of multiple subcarrier or quotient; They are three years old, according to the channel estimating mathematic interpolation interference before and after noise reduction process, noise reduction process process is as follows: carry out IFFT to the channel estimation value of frequency domain and be converted into time domain, according to the characteristic of channel to time domain data windowing, carry out FFT conversion again, obtain the channel estimation in frequency domain value after noise reduction.
Preferably, when calculating average interference power and channel estimating average power, the result of calculation in multiple moment is averaged.
The present invention is applicable to dissimilar Interference Detection, can estimate interference position accurately.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the basic flow sheet of the interference detection method of the embodiment of the present invention;
Fig. 2 is the channel estimation power curve chart of the whole working frequency range of the embodiment of the present invention;
Fig. 3 is the interference power curve chart adopting three kinds of methods to calculate respectively of the embodiment of the present invention;
Fig. 4 is the average interference power curve chart of each subband under three kinds of methods of the embodiment of the present invention;
Fig. 5 be the embodiment of the present invention first time iteration three kinds of methods subband mark result figure;
Fig. 6 be the embodiment of the present invention first time iteration comprehensive three kinds of methods after interference detection results figure;
Fig. 7 is the subband mark result figure of three kinds of methods of the second time iteration of the embodiment of the present invention;
Fig. 8 is the interference detection results figure after comprehensive three kinds of methods of the second time iteration of the embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments; It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The present embodiment hypothesis interference source is frequency domain continuous print broad-band interference, and its interference detection method basic thought as shown in Figure 1, comprises the following steps: 101 receiving terminals are chosen multiple method and calculated interference; The average interference power of each subband of 102 calculating; 103 calculate the channel estimating average power in whole bandwidth, determine interference power thresholding; 104 for often kind of interference calculation method, if the average interference power of subband exceeds interference power thresholding, is then labeled as disturbed subband, then the mark result of comprehensive multiple method; 105, remove the disturbed subband in working band, recalculate channel estimating average power and determine new interference power thresholding; If 106 meet iterated conditional, then forward 104 steps to and carry out next iteration, otherwise enter next step; 107 judge broad-band interference frequency range according to interference subband mark and average interference power.
The present embodiment chooses three kinds of methods to calculate interference, as follows respectively: one, according to difference or the quotient calculating interference of adjacent sub-carrier channel estimation value; Its two, calculate interference according to the difference of channel estimation value of two subcarriers at a distance of multiple subcarrier or quotient; They are three years old, according to the channel estimating mathematic interpolation interference before and after noise reduction process, noise reduction process process is as follows: carry out IFFT to the channel estimation value of frequency domain and be converted into time domain, according to the characteristic of channel to time domain data windowing, carry out FFT conversion again, obtain the channel estimation in frequency domain value after noise reduction.
As shown in Figure 2, in bandwidth, subcarrier number is 240 to channel estimation power in the whole working band of the present embodiment, is divided into the subband of 20 formed objects.The three kinds of interference powers adopting above-mentioned three kinds of interference calculation methods to calculate respectively as shown in Figure 3, divide subband under three kinds of methods, and calculate average interference power in subband, result as shown in Figure 4.As calculated, the channel estimating average power of the whole working band provided in Fig. 2 is PwrSig=3.4dB, supposes that design interference power thresholding is Th=PwrSig+2dB=5.4dB.Then first time iteration is started, the average interference power of each subband compares with interference power thresholding, if the average interference power of sub-band exceeds interference power thresholding, then be labeled as 1, represent that this sub-band is disturbed sub-band, the court verdict of the disturbed subband of three kinds of methods as shown in Figure 5, gets the intersection of three kinds of interference court verdicts, the court verdict of all disturbed subbands as shown in Figure 6, being numbered [89101213] of all disturbed subbands.Disturbed subband shown in Fig. 6 is deducted from whole working band, channel estimating average power PwrSig=1.2dB in working band new after calculating deduction, redefining interference power thresholding is Th=PwrSig+2dB=3.2dB, because the difference between new interference power thresholding and former interference power thresholding has exceeded predetermined value (1dB), then enter second time iteration, the subband interference court verdict of three kinds of methods and comprehensive court verdict are as shown in Figure 7 and Figure 8.Again the disturbed subband shown in Fig. 8 is deducted from whole working band, calculate the channel estimating average power PwrSig=1.1dB in new working band, redefining interference power thresholding is Th=PwrSig+2dB=3.1dB, because new interference power thresholding is substantially identical with former interference power thresholding, both do not exceed predetermined value at difference, illustrate that all disturbed subbands are found out all, then iteration terminates, and can find out that the interference band that Fig. 8 indicates is identical with the disturbed situation of reality that the channel estimation power of Fig. 2 embodies.
Due to the interference signal that known disturbances source is a broadband, disturbed subband is numbered [6789101213], calculate the average interference power between the from the 6th to the 13rd subband, the result of calculation of three kinds of methods is 6.2dB, 6.7dB and 3.5dB, all exceed interference power thresholding 3.2dB, therefore the interference band of the present embodiment is the whole frequency range between the 6th to the 13rd subband.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (5)
1. the interference detection method in OFDM wireless communication system, is characterized in that, said method comprising the steps of:
1.1, receiving terminal chooses the multiple interference calculation method based on sub-carrier channels estimated value;
1.2, working band is divided into multiple subband, and receiving terminal adopts described multiple interference calculation method to calculate the average interference power of each subband successively;
1.3, the channel estimating average power in evaluation work frequency band, according to this average power determination interference power thresholding;
1.4, for often kind of interference calculation method, the average interference power of each subband in working band is compared with interference power thresholding, if the average interference power of subband exceeds interference power thresholding, then marking this subband is disturbed subband, then the mark result of comprehensive described multiple interference calculation method, finds out all disturbed subband in working band;
1.5, all disturbed subbands are removed as new working band in former working band, recalculate the channel estimating average power in working band and determine new interference power thresholding, if new interference power thresholding and former interference power thresholding meet iterated conditional, then repeat step 1.4 and carry out next iteration, otherwise iteration terminates, all interference subbands all previous iteration found out are as final interference detection results.
2. method according to claim 1, it is characterized in that, known disturbances source is frequency domain continuous print broad-band interference, then step 1.5 also does further process to final interference detection results, describedly to be treated to: for often kind of interference calculation method, calculate the average interference power of the frequency range between any two disturbed subbands, if all higher than interference power thresholding, then think that this frequency range is all disturbed.
3. method according to claim 1 and 2, is characterized in that, described iterated conditional is: the difference between new interference power thresholding and former interference power thresholding is greater than predetermined value.
4. method according to claim 1 and 2, is characterized in that, described multiple interference calculation method comprises following three kinds:
One, according to difference or the quotient calculating interference of adjacent sub-carrier channel estimation value; Its two, calculate interference according to the difference of channel estimation value of two subcarriers at a distance of multiple subcarrier or quotient; They are three years old, according to the channel estimating mathematic interpolation interference before and after noise reduction process, noise reduction process process is as follows: carry out IFFT to the channel estimation value of frequency domain and be converted into time domain, according to the characteristic of channel to time domain data windowing, carry out FFT conversion again, obtain the channel estimation in frequency domain value after noise reduction.
5. method according to claim 1 and 2, is characterized in that, when calculating average interference power and channel estimating average power, is averaged to the result of calculation in multiple moment.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106656372A (en) * | 2016-12-12 | 2017-05-10 | 西安空间无线电技术研究所 | Frequency band interference detection method for frequency hopping system |
| CN107018530A (en) * | 2016-01-28 | 2017-08-04 | 大唐移动通信设备有限公司 | A kind of interference source localization method and device |
| CN115276717A (en) * | 2022-07-28 | 2022-11-01 | 贵州电网有限责任公司 | Multimode power communication method and module |
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| EP1276251A1 (en) * | 2001-07-11 | 2003-01-15 | Sony International (Europe) GmbH | Method for calculating a weighting vector for an antenna array |
| US20070195734A1 (en) * | 2006-02-17 | 2007-08-23 | Suman Das | Methods of reverse link power control |
| CN102256360A (en) * | 2011-07-14 | 2011-11-23 | 南京邮电大学 | Knapsack problem-based resource allocation method in cognitive radio system |
| CN103916229A (en) * | 2014-04-29 | 2014-07-09 | 电信科学技术研究院 | Interference suppression method and device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1276251A1 (en) * | 2001-07-11 | 2003-01-15 | Sony International (Europe) GmbH | Method for calculating a weighting vector for an antenna array |
| US20070195734A1 (en) * | 2006-02-17 | 2007-08-23 | Suman Das | Methods of reverse link power control |
| CN102256360A (en) * | 2011-07-14 | 2011-11-23 | 南京邮电大学 | Knapsack problem-based resource allocation method in cognitive radio system |
| CN103916229A (en) * | 2014-04-29 | 2014-07-09 | 电信科学技术研究院 | Interference suppression method and device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107018530A (en) * | 2016-01-28 | 2017-08-04 | 大唐移动通信设备有限公司 | A kind of interference source localization method and device |
| CN107018530B (en) * | 2016-01-28 | 2020-05-05 | 大唐移动通信设备有限公司 | Interference source positioning method and device |
| CN106656372A (en) * | 2016-12-12 | 2017-05-10 | 西安空间无线电技术研究所 | Frequency band interference detection method for frequency hopping system |
| CN106656372B (en) * | 2016-12-12 | 2020-04-10 | 西安空间无线电技术研究所 | Frequency band interference detection method of frequency hopping system |
| CN115276717A (en) * | 2022-07-28 | 2022-11-01 | 贵州电网有限责任公司 | Multimode power communication method and module |
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