CN101136654B - Method and device for eliminating narrow-band interference in communication system - Google Patents
Method and device for eliminating narrow-band interference in communication system Download PDFInfo
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Abstract
This invention provides a method and a device for eliminating narrow band interference in a communication system, in which, the method includes: A, carrying out windowed transformation and fast Fourier transformation FFT to sampled signals of the first length containing N points and then computing signal energy of each point and accumulating the energies, B, comparing the accumulated value with a preset target value when reaching to preset time and recording the signal position information corresponding to the accumulated value of the target value, C, adjusting the signal amplitude of the position in conformity with the target value and then outputting it after IFFT.
Description
Technical field
The present invention relates to communication technical field, the method and the device of narrow band interference in particularly a kind of cancellation in communication systems.
Background technology
In communication system, spread spectrum communication system is used in the world today more and more to come generally, and the broadband communication technology is also increasingly mature.The intrinsic spreading gain of spread spectrum makes spread-spectrum communication system have stronger antijamming capability than other communication system.When jamming signal bandwidth during less than the bandwidth of spreading code itself, in reception place through after the despreading process, thereby interference signal can expand to the influence that weakens interference on the whole frequency band.Therefore spread-spectrum signal can weaken narrow band interference to a certain extent, and the degree of weakening is relevant with the ratio of spreading code bandwidth and jamming signal bandwidth.
A spread spectrum signal, for example by pseudo noise (Pseudo Noise, PN) the sequence typical frequency spectrum of carrying out spread spectrum is submerged in the noise, be illustrated in figure 1 as general spread-spectrum signal spectrum energy schematic diagram, wherein, " ideal signal " is meant the signal energy of the actual transmission of travelling carriage, and " noise " just is meant those additivitys interference, behind the spread spectrum, the ideal signal energy in the unit frequency domain is generally less than equal noise energy; The signal that " strong jamming " refers generally to block signal or sent by wired TV station, air station or near communication equipment; " typical case disturbs " is meant the signal that those are sent by the low-power source, for example ham radio, intercom etc.; The tolerable interference signal rank of " processing gain " expression travelling carriage spread signal.Spread-spectrum signal be subjected to that the typical case disturbs influence the time can also recover, signal just can't recover at all again when strong jamming occurs, even and if typical interference, though but can the restoring signal systematic function also can descend.
There is regulation in the international frequency committee for the frequency range of the use of spread-spectrum communication system, and country variant and area are also for spread-spectrum communication system has distributed special-purpose frequency range simultaneously, and this has carried out the preparation of frequency spectrum resource for the application of spread-spectrum communication system.Before operator intends adopting spread-spectrum communication system, all can apply for usually, to guarantee the legal use of used frequency range to the frequency band that uses, the early stage of spread-spectrum communication system planning simultaneously, can carry out the frequency spectrum frequency sweep, remove illegal external interference, to guarantee spread-spectrum communication system.
But because some its burst characteristic of bursty interference signal are not easy to be under an embargo fully, also there is a variety of causes in the spectrum allocation may of part countries and regions simultaneously, makes spread-spectrum communication system unavoidably can run into narrow band interference in actual use.Narrow band interference can make that spread-spectrum communication system congestion ratio and cutting off rate raise, the overload of radio frequency power control system, increase the travelling carriage power consumption, reduce base station range.Under opposite extreme situations, high-power interference even can block whole sub-district makes normal communication to carry out.Therefore thereby must find a good solution to eliminate or weaken narrow-band interference signal makes communication quality be guaranteed to the influence of spread-spectrum communication system.
Existing processing narrow band interference method can be divided into two classes usually:
(1), it is passed through an arrowband trapper or trapper group for the signal that carries out simulation process usually.
This method generally all is that the technology by the surface acoustic wave class realizes.The frequency of interference signal is done some estimations, according to estimated result, place the arrowband microwave trap in the place that interference signal is being arranged, for example phase-locked loop also can be used for following the tracks of interference signal.But, because there is limitation in analogue technique itself, and most underaction.
(2) frequency domain removing method is generally all realized by the digital processing process.Signal through digitlization later on by certain computing (for example: discrete Fourier transform (DFT) FFT) transform to frequency domain.Handle the interference signal method at frequency domain and can be summed up as two kinds: a kind of method is to use the influence of filter filtering interfering on frequency domain data.This kind method is applicable to the situation of known disturbances bandwidth and position.When disturbing when position, jamming bandwidth and the number of frequency domain can not clearly be determined, this method just has certain limitation; Another kind method is to calculate signal amplitude on each frequency, relatively will put 0 or drop to noise level and get on above the signal of thresholding with thresholding then.This method can be adaptive to a plurality of interference, and different jamming bandwidths and interfering frequency change to be handled.
But this method exists damagedly aspect the frequency spectrum elimination, because adopt rectangular window to block and introduce spread spectrum, and the discrete Fourier transform (DFT) of nonperiodic signal makes and disturbs in the entire spectrum spatial diffusion; And common windowing computing can cause the normal signal noiseless the time to form compression in the front and rear part of data segment, influences signal quality equally.
In addition, said method all has certain difficulty on the real-time implementation of hardware, because will all will handle and operate each data sample when handling, that need not stop carries out spectrum estimation and with power spectrum restriction within the specific limits, for the very high broadband system data of speed, the demand of operand is bigger.
Summary of the invention
The objective of the invention is to, the method for narrow band interference in a kind of cancellation in communication systems is provided, can under the prerequisite that less takies hardware resource, handle in real time and disturb.
Another object of the present invention is to, the device of narrow band interference in a kind of cancellation in communication systems is provided, can under the prerequisite that less takies hardware resource, handle in real time and disturb.
The method of narrow band interference comprises the following steps: in the cancellation in communication systems of the present invention
Steps A: with after the comprising sampled signal that N orders and carry out windowing conversion and fast fourier transform FFT of first length, calculate the signal energy of each point respectively, and respectively the signal energy of each point is added up;
Step B: when being added to the scheduled time, each accumulating values and preset target value are compared, and record is greater than the pairing signal location information of the accumulating values of described desired value;
Step C: the signal amplitude of described position is adjusted to consistent, after anti-fast fourier transform IFFT conversion, exported then with described desired value.
The method of narrow band interference in the cancellation in communication systems of the present invention, can also for, sampled signal to first length in the described steps A is expanded, and expands to the sampled signal that M is ordered that comprises of second length, wherein, M=2^k*N, 2^k is the hop count that comprises N length number strong point section in the M length number strong point, k＞0, and the M point signal after will expanding then carries out carrying out the FFT conversion after the windowing conversion, and after recovering, export after abandoning the M-N point data outside the N point through IFFT among the step C.
Wherein, in described step B, when the accumulating values do not found greater than described desired value, with the data of output without interference eliminated.
Wherein, signal energy be the each point signal mould square, the described time of adding up can preestablish, the characteristic according to different system for example can be set to 60～120ms in the cdma system.
In addition, the method for narrow band interference in the cancellation in communication systems of the present invention also comprises the following steps: the data after described IFFT conversion are carried out compensation of delay.
The device of narrow band interference in the cancellation in communication systems of the present invention, comprise FFT converter unit, interference cancellation unit, IFFT converter unit and interference eliminated control unit, wherein, described FFT converter unit, be used for the sampled signal that N orders that comprises of first length is carried out windowing conversion and FFT conversion, and export the data after the conversion to described interference cancellation unit and described interference eliminated control unit; Described interference eliminated control unit, be used for the N point data of sending according to described FFT converter unit, calculate the signal energy of each point, and respectively the signal energy of each point is added up, when being added to the scheduled time, each accumulating values and preset target value are compared, and write down greater than the pairing signal location information of the accumulating values of described desired value, the positional information with described desired value and described signal is sent to described interference cancellation unit then; Described interference cancellation unit is used for the signal amplitude of described position is adjusted to after described desired value is consistent, is sent to the IFFT converter unit; Described IFFT converter unit, the signal that is used for described interference cancellation unit is sent carries out the IFFT conversion.
Wherein, described interference eliminated control unit, comprise the energy computing module, add up and control output module, desired value module, comparison module and location register module, wherein, described energy computing module, be used for receiving respectively the N point data that described FFT converter unit sends, and calculate the signal energy of each point, send it to each control output module that adds up then; The described control output module that adds up, be used to receive the each point signal energy that corresponding energy computing module sends, and each point signal energy signal energy last with it added up, when being added to the scheduled time, export each accumulating values to described desired value module and described comparison module; Described desired value module is used to receive add up and controls the cumulative data that output module sends, and desired value is set, and this desired value is sent to described interference cancellation unit; Described comparison module is used for the desired value that N accumulating values that the described control output module that adds up is sent and desired value module send and compares, and will be sent to the location register module greater than the accumulating values of described desired value; Described location register module is used to write down the corresponding signal location of accumulating values that described comparison module sends, and the positional information of described signal is sent to described interference cancellation unit.
Wherein, described FFT converter unit further comprises expansion module, be used for the sampled signal of first length is expanded, expand to the sampled signal that M is ordered that comprises of second length, wherein, M=2^k*N, 2^k are the hop counts that comprises N length number strong point section in the M length number strong point, k＞0; Described IFFT converter unit is further used for abandoning the M-N point data outside the N point after M point signal is carried out the IFFT conversion.
In addition, the device of narrow band interference in the cancellation in communication systems of the present invention, may further include parameter controller and select module, wherein, described parameter controller, be used for when not having narrow band interference to exist, control selects module to select the data of output without described interference cancellation unit and the operation of IFFT converter unit.
Wherein, described signal energy be the each point signal mould square, the described time of adding up can preestablish, the characteristic according to different system for example can be set to 60～120ms in the cdma system.
In addition, the device of narrow band interference in the cancellation in communication systems of the present invention may further include the data delay compensating module, is used for the data after described IFFT conversion are carried out compensation of delay.
The invention has the beneficial effects as follows: according to the method and apparatus of narrow band interference in the cancellation in communication systems of the present invention, by a plurality of periodograms in a period of time are asked the estimation of on average carrying out power spectrum, utilize the decision threshold of the multiple of a certain desired value of power spectrum obtain then, can self adaptation satisfy various situations and prevent the generation of judging by accident as narrow band interference; Utilize the power spectrum of estimating in a period of time to carry out the narrow band interference judgement simultaneously, the position that the record narrow band interference occurs only is data on the narrow band interference position that obtained according to the last time period to the processing of real time data, and amount of calculation obviously reduces; And minimize and comparison operation is just to carry out once at set intervals, do not need every segment data all to operate, significantly reduced the requirement of hardware real-time processing; The present invention has also designed the selection control module, and execution that can the big module of SHIELDING CALCULATION amount when finding not have narrow band interference to exist as the IFFT converter unit, thereby has further reduced taking hardware resource.
Description of drawings
Fig. 1 is general spread-spectrum signal spectrum energy schematic diagram;
Fig. 2 realizes schematic diagram for narrow band interference cancellation element of the present invention;
Fig. 3 is the schematic diagram of FFT converter unit in the narrow band interference cancellation element of the present invention;
Fig. 4 is the schematic diagram of IFFT converter unit in the narrow band interference cancellation element of the present invention;
Fig. 5 is no M expansion IFFT output time domain waveform schematic diagram;
Fig. 6 has N to extract the time domain waveform schematic diagram after M expansion, IFFT output are arranged before the FFT.
Embodiment
Below, 1～6 method and apparatus of describing narrow band interference in a kind of cancellation in communication systems of the present invention in detail in conjunction with the accompanying drawings.
Describe the method for narrow band interference in the cancellation in communication systems of the present invention in detail, this method comprises the following steps:
Step 100: after the sampled signal that will comprise predetermined point (for example N) length is carried out windowing conversion and fast fourier transform FFT conversion, calculate the signal energy of each point respectively, and respectively the signal energy of each point is added up, when being added to the scheduled time, with each accumulating values output.
Wherein, in the embodiment of the invention among the embodiment spread-spectrum signal bandwidth be 1.2288MHz, data sampling rate is 2 * 1.2288MHz, in order to differentiate the narrow band interference of 30kHz, at least to adopt 2 * 1.2288 * 10^6/ (30 * 10^3)=81.92 points, just 128 FFT.As everyone knows, counting of FFT is many more strong more to the narrow band interference resolution capability, and hard-wired amount of calculation is also big more, can according to oneself system and require the actual N value of choosing of the identification precision of narrow band interference.In the above-described embodiments one has been adopted N=256.
In addition, above-mentioned signal energy be the each point signal mould square.
In addition, desirable 60～120ms of the scheduled time of adding up, this value can not cause very big influence to the respond of narrow band interference to system.In an embodiment of the present invention, select about 106ms can obtain more stable power spectrum estimation result again as the ability that the time span that adds up neither influences system's elimination narrow band interference.
Step 200: receive each accumulating values, and desired value is set according to predetermined rule.
Wherein, this desired value can be minimum value, mean value or other certain value by the common decision of all or part of energy statistics of parameter appointment in N accumulating values for example.Can also be the certain multiple with this desired value, so that the interference that surpasses certain limit is eliminated, through emulation, multiple generally gets 3.0.
Step 300: each accumulating values and desired value are compared, and record is greater than the pairing positional information of the accumulating values of this desired value, then the signal amplitude of this position is adjusted to consistently,, after anti-fast fourier transform IFFT conversion, exported then eliminate to disturb with desired value.
In addition, in step 100, may further include the following step:
Step 11: the sampled signal that comprises predetermined point (for example N) length is expanded, expand to the M point, M=2^k*N, 2^k are the hop counts that comprises N length number strong point section in the M length number strong point, k 〉=0, the M point after will expanding then carries out carrying out the FFT conversion after the windowing conversion.
Owing to expanded data point, window function causes that the amplitude fading of data both sides mainly acts on the M-N point outside the N point; After recovering through follow-up IFFT, abandon the M-N point outside the N point, after reconfiguring, the degree of data amplitude decay reduces greatly.Repeat above process, carry out storage, the computing of next group M length, obtain the signal data of sectional N length, will form final dateout after these sections combination.
In addition, can also control selection and whether the sampled signal of primary reception be carried out interference elimination treatment, if not, then directly with primary reception to sampled signal export.
Owing to need signal is carried out FFT transformation calculations and IFFT transformation calculations in the device of narrow band interference in the cancellation in communication systems of the present invention, and transformation calculations needs time delay, therefore, based on as mentioned above, can carry out compensation of delay to the data after the IFFT conversion.
Below, describe the device of narrow band interference in the cancellation in communication systems of the present invention in detail, comprise FFT converter unit, interference cancellation unit, IFFT converter unit and interference eliminated control unit.
Wherein, the FFT converter unit, the N point data that is used for that data storage cell is sent carries out carrying out the FFT conversion after the windowing conversion, and exports the data after the conversion to interference cancellation unit and interference eliminated control unit;
The interference eliminated control unit, be used for the N point data of sending according to the FFT converter unit, calculate the signal energy of each point, and respectively the signal energy of each point is added up, when being added to the scheduled time, each accumulating values and preset target value are compared, and record is sent to described interference cancellation unit with this desired value and this signal location information then greater than the pairing signal location information of the accumulating values of described desired value.
Described interference cancellation unit is used for the signal amplitude of described position is adjusted to after described desired value is consistent, is sent to the IFFT converter unit.
The IFFT converter unit, the data after the process interference eliminated that is used for interference cancellation unit is sent are carried out the IFFT conversion, and the data after the conversion are outputed to follow-up unit, and for example despread unit etc. is carried out subsequent treatment.
Particularly, the interference eliminated control unit comprises the energy computing module, adds up and control output module, desired value module, normalization module, comparison module and location register module.
Wherein, the energy computing module is used to receive the N point data that the FFT converter unit sends, and each energy computing module receives its corresponding 1 point data, and calculates the pairing signal energy of this point data, and the each point signal energy is sent to the accumulated counts control module.
Wherein, the signal energy of calculating in the energy computing module be the each point signal mould square.Obviously, the aforementioned calculation result is exactly the periodogram of this data segment.
The control output module adds up, be used to receive the each point signal energy that corresponding energy computing module sends, and each point signal energy signal energy last with it added up, when being added to the scheduled time, export each accumulating values to desired value module and comparison module.
Wherein, the add up time desirable 60～120ms of control in the output module that add up, this value can not cause very big influence to the respond of narrow band interference to system.In an embodiment of the present invention, select about 106ms as the time span that adds up, the ability that simulation result shows selects this length neither to influence system's elimination narrow band interference can obtain more stable power spectrum estimation result again.
The desired value module is used to receive add up and controls the cumulative data that output module sends, and according to predetermined rule desired value is set, and this desired value is sent to the normalization module.Wherein, this desired value can be minimum value, mean value or other certain value by the common decision of all or part of energy statistics of parameter appointment in N accumulating values for example.
In an embodiment of the present invention, this desired value is got minimum value, because this moment, power spectrum was more stable, low value can not occur, and average can be subjected to very big influence along with the quantity of narrow band interference and the variation of intensity.Minimizing in addition only needs some comparison operations, and amount of calculation is less.
Comparison module is used for the desired value that N accumulating values that the control output module that adds up is sent and desired value module send and compares, and will be sent to the location register module greater than the accumulating values of described desired value.
Because, can upgrade location register module and desired value module at regular intervals, thus can be adaptive along with ambient conditions change and change, reach better effect.
The location register module is used to write down the corresponding signal location of accumulating values that described comparison module sends, and the positional information of described signal is sent to described interference cancellation unit.
In addition, the desired value module is sent to comparison module after can being further used for the control output module data of sending that add up be multiply by a multiple through a multiplier;
Comparison module then multiply by the desired value that receives the numerical value behind the prearranged multiple as decision threshold, and the data of sending with the control output module that adds up compare, and will be sent to the location register module greater than the numerical value of this decision threshold.In addition, be affected in order not make useful signal be judged as interference, the performance that influence final system is understood in choosing of multiple, and through emulation, multiple generally gets 3.0.
In addition, as shown in Figure 3, FFT converter unit in the cancellation in communication systems of the present invention in the device of narrow band interference, can further comprise M point expansion module, be used for the data segment that original N data point forms is carried out the data length expansion, other M-N data point in the current data section surrounding time together comprised come in to form a M length data section that length is bigger, M point after the expansion carries out carrying out the FFT conversion after the windowing conversion then, and exports the data after the conversion to interference cancellation unit and interference eliminated control unit; Correspondingly, comprise M energy computing module and M accumulator module in the interference eliminated control unit, wherein the function of energy computing module and accumulator module does not change as previously mentioned, just the conversion of quantity.
Based on as mentioned above, the windowing computing, exactly to M length data section carry out on the time domain with the window function multiplying.In order to suppress the spread spectrum that narrow band interference is introduced better when blocking, need realize suppressing to secondary lobe by window function, in an embodiment of the present invention, chosen the Hanning window that M is ordered; The FFT arithmetic element is carried out the FFT computing to the M point data through windowing exactly.Can see by Fig. 5, because the introducing of window function, decay on the amplitude can occur in both sides, can form effect of nonlinear, influence the signal to noise ratio (snr) of signal then useful signal for useful signal.Can not weaken the inhibition of window function to the interference signal secondary lobe in order to reduce the influence of window function to useful data, to have simultaneously, the effect of M point expansion module can embody.Data obtain the M point by the N point after through expansion, increases of counting of back level FFT, operand strengthens M/N times, thus M choose the complexity that has influenced hardware.Owing to expanded data point, window function causes that the amplitude fading of data both sides mainly acts on the M-N point outside the N point; After recovering through follow-up IFFT, abandon the M-N point outside the N point, after reconfiguring, the degree of data amplitude decay reduces greatly.
As shown in Figure 4, be the schematic diagram of IFFT converter unit, this IFFT converter unit comprises IFFT computing module, N point extracting unit.The IFFT computing module is exactly to carrying out the IFFT computing through the M point data after the interference eliminated.As seen from Figure 5, because the introducing of window function, decay on the amplitude can appear in both sides for useful signal, can form effect of nonlinear to useful signal, then influence the signal to noise ratio (snr) of signal, this influence returns to time domain at IFFT can be seen, for back grade demodulation considerable influence is arranged; N point extracting unit is exactly the M point data to IFFT output, the N point data of taking out correspondence position, and after reconfiguring, the degree of data amplitude decay reduces greatly, can improve demodulation ability then; The shown in Figure 6 description in the middle FFT converter unit of the embodiment of the invention and the processing procedure of IFFT converter unit inside.
In addition, owing to need signal is carried out FFT transformation calculations and IFFT transformation calculations in the device of narrow band interference in the cancellation in communication systems of the present invention, and transformation calculations needs time delay, for this reason, embodiments of the invention can further include the data delay compensating unit, be used for time delay is compensated, to prevent data distortion.
In addition, can further include parameter controller and select module, wherein whether be direct mode operation to parameter controller if being used for controlling manually or automatically interference blanking unit, when not having narrow band interference to exist, for example show in the location register module that no positional information is recorded, then parameter controller is controlled to be direct mode operation, select module to select the data of output without interference cancellation unit and the operation of IFFT converter unit, execution by the big module of SHIELDING CALCULATION amount, thereby reduce the operation of hardware, save hardware spending.
In sum, method and device according to narrow band interference in the cancellation in communication systems of the present invention, convert the signal into frequency domain, by a plurality of periodograms in a period of time are asked the estimation of on average carrying out power spectrum, utilize the decision threshold of the multiple of a certain desired value of power spectrum obtain then, can self adaptation satisfy various situations and prevent the generation of judging by accident as narrow band interference; Utilize the power spectrum of estimating in a period of time to carry out the narrow band interference judgement simultaneously, the position that the record narrow band interference occurs only is data on the narrow band interference position that obtained according to the last time period to the processing of real time data, and amount of calculation obviously reduces; And minimize and comparison operation is just to carry out once at set intervals, do not need every segment data all to operate, significantly reduced the requirement of hardware real-time processing; The present invention has also designed the selection control module, and execution that can the big module of SHIELDING CALCULATION amount when finding not have narrow band interference to exist as the IFFT converter unit, thereby has further reduced taking hardware resource.
More than be in order to make those of ordinary skills understand the present invention; and to detailed description that the present invention carried out; but can expect; in the scope that does not break away from claim of the present invention and contained, can also make other variation and modification, these variations and revising all in protection scope of the present invention.
Claims (11)
1. the method for narrow band interference in the cancellation in communication systems is characterized in that, comprises the following steps:
Steps A: the sampled signal that N orders that comprises to first length is expanded, expand to the sampled signal that M is ordered that comprises of second length, wherein, M=2^k*N, 2^k is the hop count that comprises N length number strong point section in the M length number strong point, and k＞0 is after the M point signal after will expanding then carries out windowing conversion and fast fourier transform FFT, calculate the signal energy of each point respectively, and respectively the signal energy of each point is added up;
Step B: when being added to the scheduled time, each accumulating values and preset target value are compared, and record is greater than the pairing signal location information of the accumulating values of described desired value;
Step C: the signal amplitude of described position is adjusted to consistent, after abandoning the M-N point data outside the N point after the anti-fast fourier transform IFFT conversion, exported then with described desired value.
2. the method for narrow band interference is characterized in that in the cancellation in communication systems as claimed in claim 1, in described step B, when the accumulating values do not found greater than described desired value, with the data of output without interference eliminated.
3. the method for narrow band interference is characterized in that in the cancellation in communication systems as claimed in claim 1, signal energy be the each point signal mould square.
4. the method for narrow band interference is characterized in that in the cancellation in communication systems as claimed in claim 1, and the described scheduled time of adding up is 60～120ms.
5. the method for narrow band interference is characterized in that in the cancellation in communication systems as claimed in claim 1, comprises the following steps: the data after described IFFT conversion are carried out compensation of delay.
6. the device of narrow band interference in the cancellation in communication systems is characterized in that, comprises FFT converter unit, interference cancellation unit, IFFT converter unit and interference eliminated control unit, wherein,
Described FFT converter unit, be used for the sampled signal that N orders that comprises of first length is expanded, expand to the sampled signal that M is ordered that comprises of second length, wherein, M=2^k*N, 2^k are the hop counts that comprises N length number strong point section in the M length number strong point, k＞0, M point signal after the expansion is carried out windowing conversion and FFT conversion, and export the data after the conversion to described interference cancellation unit and described interference eliminated control unit;
Described interference eliminated control unit, be used for the data of sending according to described FFT converter unit, calculate the signal energy of each point, and respectively the signal energy of each point is added up, when being added to the scheduled time, each accumulating values and preset target value are compared, and write down greater than the pairing signal location information of the accumulating values of described desired value, the positional information with described desired value and described signal is sent to described interference cancellation unit then;
Described interference cancellation unit is used for the signal amplitude of described position is adjusted to after described desired value is consistent, is sent to the IFFT converter unit;
Described IFFT converter unit, the signal that is used for that described interference cancellation unit is sent carry out abandoning after the IFFT conversion M-N point data outside the N point.
7. the device of narrow band interference is characterized in that in the cancellation in communication systems as claimed in claim 6, and described interference eliminated control unit comprises the energy computing module, adds up and control output module, desired value module, comparison module and location register module, wherein,
Described energy computing module is used for receiving respectively the N point data that described FFT converter unit sends, and calculates the signal energy of each point, sends it to each control output module that adds up then;
The described control output module that adds up, be used to receive the each point signal energy that corresponding energy computing module sends, and each point signal energy signal energy last with it added up, when being added to the scheduled time, export each accumulating values to described desired value module and described comparison module;
Described desired value module is used to receive add up and controls the cumulative data that output module sends, and desired value is set, and this desired value is sent to described interference cancellation unit;
Described comparison module is used for the desired value that N accumulating values that the described control output module that adds up is sent and desired value module send and compares, and will be sent to the location register module greater than the accumulating values of described desired value;
Described location register module is used to write down the corresponding signal location of accumulating values that described comparison module sends, and the positional information of described signal is sent to described interference cancellation unit.
8. as the device of narrow band interference in claim 6 or the 7 described cancellation in communication systems, it is characterized in that, further comprise parameter controller and select module, wherein,
Described parameter controller is used for when not having narrow band interference to exist, and control selects module to select the data of output without described interference cancellation unit and the operation of IFFT converter unit.
9. as the device of narrow band interference in claim 6 or the 7 described cancellation in communication systems, it is characterized in that, described signal energy be the each point signal mould square.
10. as the device of narrow band interference in claim 6 or the 7 described cancellation in communication systems, it is characterized in that the described scheduled time of adding up is 60～120ms.
11. the device as narrow band interference in claim 6 or the 7 described cancellation in communication systems is characterized in that, further comprises the data delay compensating module, is used for the data after described IFFT conversion are carried out compensation of delay.
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| CN103326674B (en) * | 2012-03-20 | 2017-07-11 | 中兴通讯股份有限公司 | The guard method of power amplifier and device |
| CN105516032B (en) | 2014-09-23 | 2018-11-16 | 华为技术有限公司 | Adaptive narrow-band interference elimination method and device |
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