CN102404271A - Device and method for narrowband interference suppression of OFDM (orthogonal frequency division multiplexing) receiver - Google Patents
Device and method for narrowband interference suppression of OFDM (orthogonal frequency division multiplexing) receiver Download PDFInfo
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Abstract
The invention discloses a device and a method for the narrowband interference suppression of an OFDM (orthogonal frequency division multiplexing) receiver, wherein the device is located on an OFDM receiving chain and between an intermediate-frequency processing module and a base band processing module; and the device is characterized by comprising a narrowband interference searching module, a digital notch filter coefficient generation module and a time domain digital notch filter module which are orderly connected. The method comprises the following steps of: firstly performing a fast Fourier transform on a digital signal input to the OFDM receiver to obtain the frequency spectrum characteristics of the input signal, then judging whether the input signal has a narrowband interference and obtaining the interference characteristics according to a set threshold, then inquiring a preset filter coefficient table according to the interference characteristics to obtain a filter coefficient, finally configuring the filter coefficient in the time domain digital notch filter module; in this way, after the digital signal input to the OFDM receiver passes through the filter, a signal after the narrowband interference is filtered is output, thereby improving the performance of resisting narrowband interference of an OFDM demodulation system.
Description
Technical field
The present invention relates to communication technical field, relate to a kind of Suppression of narrow band interference apparatus and method of OFDM receiver more specifically.
Background technology
OFDM (Orthogonal Frequency Division Multiplexing, OFDM) is a kind of modulation technique, utilizes the load mode of multicarrier, and the subcarrier of a serial data through low transmission rate transmitted.The OFDM technology adopts a kind of discontinuous multitone modulation technique, and a large amount of signals in the carrier wave of different frequency are merged into single signal, accomplishes signal and transmits.The OFDM technical development is in order to improve the spectrum of carrier utilance, to be characterized in that each subcarrier is mutually orthogonal, so the frequency spectrum after the band spectrum modulation can be overlapped, thereby reduces the phase mutual interference between the subcarrier.The WiMAX communication system just is based on the communication system of OFDM modulation technique.
One of important key of using OFDM is to increase opposing frequency selective fading ability, has also increased the ability that resists narrow band interference simultaneously.It is that the power of supposing ofdm signal is compared much bigger with narrow band interference that but ofdm system self can resist the condition of narrow band interference; Yet in the practical application; The transmitting power of ofdm signal is limited (this point is particularly outstanding in miniaturization base stations such as PICO or FEMTO); When extraneous narrow-band interference signal is enough strong, will worsen the normal demodulation performance of community user like this; Reduce cell capacity and coverage, also can cause the sub-district choking phenomenon when serious.Therefore in limited frequency spectrum resources, how suppressing narrow band interference is very important problem.
Suppression of narrow band interference device of the prior art mainly is divided into the Suppression of narrow band interference device of handling based on spectrum transformation based on the narrow band interference device of adaptive-filtering and frequency domain of time domain.Wherein time domain based on the basic principle of the Suppression of narrow band interference device of adaptive-filtering is: utilize to disturb and the statistical property of the ofdm signal that receives different; The employing adaptive algorithm is predicted for interference and is estimated; And the interference that will estimate eliminates from resultant signal, suppresses the purpose disturbed thereby reach.The basic principle based on the Suppression of narrow band interference device of spectrum transformation of frequency domain is: the signal spectrum characteristic that adopts the FFT transformation calculations to receive; In frequency domain, search and disturb the frequency that occurs; And on frequency domain, this interference frequency is handled accordingly, thereby reduce the influence of disturbing demodulation to received signal.
Existing related patent U.S. Patent No. document is number of patent application CN200710152170.1; Denomination of invention is the method for slowing down orthogonal frequency division multiplex (MUX) receiver narrow band interference; The method that this patent application suppresses narrow band interference adopts frequency domain interference gain inhibition method, and signal is carried out FFT conversion (fast Fourier transform) to frequency domain.Then confirm narrow band interference, on signal spectrum, interference spectrum decayed then and realize disturbing inhibit feature that the frequency-region signal process FFT contravariant after will handling at last is changed to time-domain signal according to the decision threshold that is provided with.There is weak point in existing patent:
(1), need realize FFT conversion and FFT inverse transformation algorithm, more complicated simultaneously.Realize that difficulty is bigger.
(2), real-time is poor.
Summary of the invention
The object of the invention is exactly that provide for the deficiency that solves prior art a kind of realizes advantage simple and reliable, that real-time is good, has the Suppression of narrow band interference device of the OFDM receiver of the good market competitiveness.
Another object of the present invention provides a kind of advantage simple and reliable, that real-time is good that realizes, has the narrow-band interference rejection method of the OFDM receiver of the good market competitiveness.
The present invention adopts following technical solution to realize above-mentioned purpose: a kind of Suppression of narrow band interference device of OFDM receiver; This device is positioned at OFDM and receives on the link; Between IF process module and baseband processing module; This device comprises narrow band interference search module, digital notch filter coefficient generation module and time-domain digital notch filter module, wherein:
The narrow band interference search module is used for that the input baseband signal is carried out fast Fourier transform (FFT) to be analyzed, and obtains according to the signal spectrum characteristic and produces required narrow band interference frequency and the jamming bandwidth thereof of digital notch filter coefficient.
Digital notch filter coefficient generation module: the narrow band interference characteristic of obtaining according to the narrow band interference search module (interfering frequency and jamming bandwidth) obtains time-domain digital notch filter coefficient fast through lookup table mode.
Time-domain digital notch filter module: the coefficient of this filter is promptly exported the baseband signal of filtering narrow band interference by the configuration of digital notch filter coefficient generation module after the time-domain digital notch filter module of the baseband signal of input through this configuration completion.
The present invention also provides a kind of and has utilized said device to realize the method to Suppression of narrow band interference, and whole implementation method comprises following several sections:
(1), obtain the input base-band signal spectrum: the baseband signal to input is carried out fast Fourier transform, obtains the input base-band signal spectrum;
(2), confirm narrow band interference characteristic (interfering frequency and jamming bandwidth): after the mould of the input base-band signal spectrum that obtains is carried out The disposal of gentle filter, obtain narrow band interference frequency and jamming bandwidth according to the thresholding that is provided with;
(3), confirm filter coefficient:, select the filter coefficient (this filter coefficient table is provided and is stored in the device storage by emulation tool) be complementary through tabling look-up according to the interfering frequency and the jamming bandwidth of narrow band interference;
(4), configuration filter: the filter coefficient that is obtained is configured in the time-domain digital notch filter module.
In said step (2), the narrow band interference determination methods comprises: the mould to frequency-region signal carries out The disposal of gentle filter, then according to set limits value detect the narrow band interference situation, greater than threshold value for there being narrow band interference, otherwise for there not being interference.
In said step (2), the narrow band interference characteristic-acquisition method comprises: existing under the situation about disturbing, obtain narrow band interference frequency and jamming bandwidth; The intermediate point of data point obtains interfering frequency between two points that intersected by threshold value and spectrum signal, and the data point number is obtained jamming bandwidth between two points that intersected by threshold value and spectrum signal.
In said step (3); Said inquiry filter coefficient comprises: the narrow band interference frequency and the jamming bandwidth that provide are tabled look-up; Earlier inquire corresponding sublist, obtaining the required configuration coefficients of current time-domain digital notch filter according to this sublist of interfering frequency inquiry then according to jamming bandwidth.
In said step (4), said time-domain digital notch filter configuration comprises:
When not having interference, it is the Bypass pattern that time-domain digital notch filter module need be set, and makes the digital signal that is input to the time-domain digital notch filter unit directly deliver to the output of time-domain digital notch filter unit;
When exist disturbing, upgrade time-domain digital notch filter coefficient, and this filter mode is set to mode of operation, this moment, the signal of output was a signal after the filtering.
The beneficial effect that the present invention adopts above-mentioned technical solution to reach is:
The present invention adopts a kind of OFDM receiver Suppression of narrow band interference apparatus and method based on the time-domain digital notch filter, has to realize the advantage simple and reliable, that real-time is good, has the good market competitiveness.
Description of drawings
Fig. 1 is the realization location drawing of Suppression of narrow band interference device provided by the invention in the OFDM receiver;
Fig. 2 is the implementation structure figure of Suppression of narrow band interference device provided by the invention;
Fig. 3 is the realization flow figure of the method for the invention.
Description of reference numerals: 201, narrow band interference search unit 202, time-domain digital notch filter generation unit 203, time-domain digital notch filter generation unit.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is carried out concrete description.
Fig. 1 is the realization location drawing of Suppression of narrow band interference device provided by the invention in the OFDM receiver.Can know that by figure Suppression of narrow band interference device provided by the invention is positioned at after the Digital IF Processing, before base band demodulating is handled.Can effectively strengthen the ability of the anti-narrow band interference of OFDM receiver to the processing of narrow-band interference signal through this device.
Device specific embodiments provided by the invention is as shown in Figure 2, comprises narrow band interference search unit 201, time-domain digital notch filter generation unit 202 and time-domain digital notch filter unit 203.
Said narrow band interference search unit 201 at first carries out the fast Fourier transform processing to the baseband digital signal of input; Obtain the mould of frequency-region signal; Then the frequency-region signal mould is carried out The disposal of gentle filter, confirm whether there is narrow band interference in the current demand signal, if having narrow band interference then obtain the characteristic informations such as interfering frequency and jamming bandwidth of required inhibition through the threshold value of setting; Be used for time-domain digital notch filter generation unit, can report testing result to give base station processor simultaneously.
Filter coefficient table in characteristic informations such as narrow band interference frequency that said time-domain digital notch filter coefficient generating unit 202 provides according to the narrow band interference search unit and the jamming bandwidth inquiry storage; Obtain corresponding filter coefficient, deliver to the time-domain digital notch filter unit and carry out the coefficient configuration.
Said time-domain digital notch filter unit 203 is the digital notch filter (such as the Notch filter etc.) of a group or the cascade of many groups; Its default conditions are Bypass state (this unit of this state does not carry out filtering to the baseband digital signal of input, directly exports to base band demodulating and handles).Behind the coefficient of the required configuration that time domain digital notch filter coefficient generating unit 202 is sent here; At first coefficient is configured in the corresponding coefficient register; Be starting state with the Bypass Status Change then, this moment, filter began the baseband signal of input is carried out filtering.After if narrow band interference search unit 201 detects the interference signal characteristic change; Time-domain digital notch filter coefficient generating unit 202 can send one group of new filter coefficient to give this unit again, and the coefficient register that only need to upgrade this unit this moment just can carry out filtering to new interference signal.
Following table 1 has provided the filter coefficient list structure that time-domain digital notch filter coefficient generating unit is tabled look-up required.
Table 1
Thereby shorten and table look-up the time in order to reduce in the table data volume two, carried out following processing: suppose that the base-band signal spectrum bandwidth is B, elect the jamming bandwidth value N five equilibrium of spectral bandwidth as, promptly jamming bandwidth may be selected to be B/N, 2B/N ..., B.When jamming bandwidth is chosen as B/N, interfering frequency may be selected to be-(2N-1) * B/ (2N) ... ,-3*B/ (2N) ,-1*B/ (2N), 0, B/ (2N), 3*B/ (2N) ..., (2N-1) * B/ (2N); When jamming bandwidth is chosen as 2B/N, interfering frequency may be selected to be-(N-1) * B/N ... ,-3*B/N ,-1*B/N, 0, B/N, 3*B/N ..., (N-1) * B/N; By that analogy, when jamming bandwidth was chosen as B, interfering frequency can only be chosen as 0.Table look-up earlier according to the sublist of jamming bandwidth inquiry, in resulting sublist, inquire about the coefficient of final required configuration then according to interfering frequency for jamming bandwidth.This coefficient table can calculate each corresponding filter coefficient to above-mentioned all bandwidth and interfering frequency selection situation through various simulation softwares.
Above-mentioned Suppression of narrow band interference device can be integrated in FPGA, ASICs, High Performance DSP device or other processors.
Based on said apparatus the present invention a kind of narrow-band interference rejection method is provided also.Fig. 3 has provided the flow chart of the method for the invention.
Step 301: sampling N data points from supplied with digital signal (N is 2 power, may be selected to be 512,1024 etc.) is carried out fast Fourier transform, obtains the frequency-region signal of current supplied with digital signal.
Step 302: the mould to frequency-region signal carries out The disposal of gentle filter, then according to set limits value detect the narrow band interference situation, greater than threshold value for there being narrow band interference, otherwise for there not being narrow band interference.For the situation that has narrow band interference; Obtain narrow band interference frequency and jamming bandwidth; Its method is: the intermediate point of data point obtains interfering frequency between two points that intersected by threshold value and spectrum signal, and the data point number is obtained jamming bandwidth between two points that intersected by threshold value and spectrum signal.Can also narrow band interference characteristic situation be informed base station controller if any demand.
Step 303: the testing result according to 302 judges whether to exist narrow band interference.Need carry out Filtering Processing if exist then show, jump to 305 this moment; Otherwise expression need not carried out Filtering Processing, directly jumps to 304.
Step 304: when not having interference; It is the Bypass pattern that time-domain digital notch filter module need be set; Make the digital signal that is input to the time-domain digital notch filter unit directly deliver to the output of time-domain digital notch filter unit, return step 301 then.
Step 305: narrow band interference frequency and jamming bandwidth situation that recording step 302 detects are used as the subordinate unit usefulness of tabling look-up.
Step 306: tabling look-up according to the 305 narrow band interference frequency and the jamming bandwidths that provide, (this tables of data is generated by simulation software; Be stored in the memory; Shown in the table format table 1); Earlier inquire corresponding sublist, obtaining the required configuration coefficients of current time-domain digital notch filter according to this sublist of interfering frequency inquiry then according to jamming bandwidth.
Step 307: configuration time-domain digital notch filter coefficient, and this filter mode is set to mode of operation.
Above-described only is preferred implementation of the present invention, should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the invention design, can also make some distortion and improvement, and these all belong to protection scope of the present invention.
Claims (6)
1. the Suppression of narrow band interference device of an OFDM receiver; This device is positioned at OFDM and receives on the link; Between IF process module and baseband processing module; It is characterized in that it comprises narrow band interference search module, digital notch filter coefficient generation module and the time-domain digital notch filter module that connects successively;
Narrow band interference search module: be used for that the input baseband signal is carried out fast Fourier transform (FFT) and analyze, obtain according to the signal spectrum characteristic and produce required narrow band interference frequency and the jamming bandwidth thereof of digital notch filter coefficient;
Digital notch filter coefficient generation module: the interfering frequency and the jamming bandwidth that obtain according to the narrow band interference search module obtain time-domain digital notch filter coefficient fast through lookup table mode;
Time-domain digital notch filter module: the coefficient of this filter is promptly exported the baseband signal of filtering narrow band interference by the configuration of digital notch filter coefficient generation module after the time-domain digital notch filter module of the baseband signal of input through this configuration completion.
2. the narrow-band interference rejection method of the described OFDM receiver of claim 1 is characterized in that it comprises the steps:
(1), obtain the input base-band signal spectrum: the baseband signal to input is carried out fast Fourier transform, obtains the input base-band signal spectrum;
(2), confirm the narrow band interference characteristic: after the mould of the input base-band signal spectrum that obtains is carried out The disposal of gentle filter, with the threshold value of setting relatively, judge whether the output signal exists narrow band interference, and obtain its interfering frequency and jamming bandwidth;
(3), confirm filter coefficient:, select the filter coefficient be complementary through tabling look-up according to the interfering frequency and the jamming bandwidth of narrow band interference;
(4), configuration filter: the filter coefficient that is obtained is configured in the time-domain digital notch filter module.
3. the narrow-band interference rejection method of OFDM receiver according to claim 2; It is characterized in that; In said step (2), the narrow band interference determination methods comprises: the mould to frequency-region signal carries out The disposal of gentle filter, then according to set limits value detect the narrow band interference situation; Greater than threshold value for there being narrow band interference, otherwise for there not being interference.
4. the narrow-band interference rejection method of OFDM receiver according to claim 2 is characterized in that, in said step (2), the narrow band interference characteristic-acquisition method comprises: existing under the situation about disturbing, obtain narrow band interference frequency and jamming bandwidth; The intermediate point of data point obtains interfering frequency between two points that intersected by threshold value and spectrum signal, and the data point number is obtained jamming bandwidth between two points that intersected by threshold value and spectrum signal.
5. the narrow-band interference rejection method of OFDM receiver according to claim 2; It is characterized in that; In said step (3); Said inquiry filter coefficient comprises: the narrow band interference frequency and the jamming bandwidth that provide are tabled look-up, and inquire corresponding sublist according to jamming bandwidth earlier, are obtaining the required configuration coefficients of current time-domain digital notch filter according to this sublist of interfering frequency inquiry then.
6. the narrow-band interference rejection method of OFDM receiver according to claim 2 is characterized in that, in said step (4), said time-domain digital notch filter configuration comprises:
When not having interference, it is the Bypass pattern that time-domain digital notch filter module need be set, and makes the digital signal that is input to the time-domain digital notch filter unit directly deliver to the output of time-domain digital notch filter unit;
When exist disturbing, upgrade time-domain digital notch filter coefficient, and this filter mode is set to mode of operation, this moment, the signal of output was a signal after the filtering.
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| CN104468443A (en) * | 2013-09-16 | 2015-03-25 | 芯迪半导体科技（上海）有限公司 | Narrow-band interference eliminating device and method for power line communication system |
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| CN112817014A (en) * | 2020-12-31 | 2021-05-18 | 北京理工大学 | Narrow-band anti-interference method suitable for time-frequency domain self-adaption |
| CN112817014B (en) * | 2020-12-31 | 2023-05-12 | 北京理工大学 | Narrow-band anti-interference method suitable for time-frequency domain self-adaption |
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