CN102404271B - 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, is transmitted by the subcarrier of a serial data by low transmission rate.OFDM technology adopts a kind of discontinuous multitone modulation technique, a large amount of signals in the carrier wave of different frequency is merged into single signal, settling signal transmission.OFDM technology development is to improve spectrum of carrier utilance, is characterized in that each subcarrier is mutually orthogonal, so the frequency spectrum after band spectrum modulation can be overlapped, thus reduces the mutual interference between subcarrier.WiMAX communication system is exactly the communication system based on OFDM modulation technology.
Use one of important key of OFDM to be to increase opposing frequency selective fading ability, too increase the ability resisting arrowband interference simultaneously.But the condition that ofdm system self can resist arrowband to disturb supposes that the power of ofdm signal is much bigger compared with disturbing with arrowband; But in practical application, the transmitting power of ofdm signal is limited (this point is particularly outstanding in the miniaturized base stations such as PICO or FEMTO), the normal demodulation performance of community user will be worsened like this when the narrow-band interference signal in the external world is enough strong, reduce cell capacity and coverage, time serious, also can cause cells block phenomenon.Therefore in limited frequency spectrum resource, how to suppress arrowband to disturb is very important problem.
Suppression of narrow band interference device of the prior art is mainly divided into the arrowband countermeasure set based on adaptive-filtering of time domain and the Suppression of narrow band interference device based on Spectrum Conversion process of frequency domain.Wherein time domain based on the general principle of the Suppression of narrow band interference device of adaptive-filtering is: the difference utilizing the statistical property of the ofdm signal disturbing and receive, adaptive algorithm is adopted to carry out predicting and estimating for interference, and the interference estimated eliminated from resultant signal, thus reach the object suppressing interference.The general principle of the Suppression of narrow band interference device based on Spectrum Conversion of frequency domain is: adopt the signal spectrum characteristic that FFT transformation calculations receives, search the frequency that interference occurs in a frequency domain, and on frequency domain, this interference frequency is processed accordingly, thus reduce the impact of interference demodulating received signal.
Existing Patents document is number of patent application CN200710152170.1, denomination of invention is slow down the method for OFDM receiver arrowband interference, this patent application suppresses the method for arrowband interference to adopt frequency domain interference gain suppressing method, signal is carried out FFT conversion (fast Fourier transform) to frequency domain.Then determine that arrowband disturbs according to the decision threshold arranged, then on signal spectrum, decay is carried out to interference spectrum and realize AF panel function, finally the frequency-region signal after process is changed to time-domain signal through FFT contravariant.Existing patent Shortcomings part:
(1), need to realize FFT conversion and FFT inverse transformation algorithm, more complicated simultaneously.Realize difficulty larger.
(2), poor real.
Summary of the invention
Object of the present invention be exactly deficiency in order to solve prior art and provide a kind ofly realize simple and reliable, that real-time is good advantage, there is the Suppression of narrow band interference device of the OFDM receiver of the good market competitiveness.
Another object of the present invention is to provide and a kind ofly realizes simple and reliable, that real-time is good advantage, 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 on OFDM receiver, between intermediate frequency process module and baseband processing module, this device comprises arrowband interference search module, digital notch filter coefficient generation module and time-domain digital notch filter module, wherein:
Arrowband disturbs search module to be used for carrying out fast Fourier transform (FFT) to input baseband signal and analyzes, the narrowband interfering frequencies needed for signal spectrum feature acquisition generation digital notch filter coefficient and jamming bandwidth thereof.
Digital notch filter coefficient generation module: obtain time-domain digital notch filter coefficient fast by lookup table mode according to the arrowband interference characteristic (interfering frequency and jamming bandwidth) that arrowband interference search module obtains.
Time-domain digital notch filter module: the coefficient of this filter is configured by digital notch filter coefficient generation module, namely exports the baseband signal of filtering arrowband interference after the time-domain digital notch filter module that the baseband signal of input is completed by this configuration.
Present invention also offers and a kind ofly utilize described device to realize method to Suppression of narrow band interference, whole implementation method comprises following several part:
(1), obtain input base-band signal spectrum: fast Fourier transform is carried out to the baseband signal of input, obtain input base-band signal spectrum;
(2), determine arrowband interference characteristic (interfering frequency and jamming bandwidth): after the smoothing filtering process of mould to the input base-band signal spectrum obtained, the thresholding according to arranging obtains narrowband interfering frequencies and jamming bandwidth;
(3), determining filter coefficient: according to interfering frequency and the jamming bandwidth of arrowband interference, selecting the filter coefficient (this filter coefficient table is provided by emulation tool and is stored in device storage) matched by tabling look-up;
(4), filter is configured: be configured to by obtained filter coefficient in time-domain digital notch filter module.
In described step (2), interference determination methods in arrowband comprises: to the smoothing filtering process of the mould of frequency-region signal, then according to setting limits value detect arrowband disturbed condition, be greater than threshold value for there is arrowband interference, otherwise for there is not interference.
In described step (2), arrowband interference characteristic acquisition methods comprises: in the presence of interference, obtains narrowband interfering frequencies and jamming bandwidth; Between two points intersected by threshold value and spectrum signal, the intermediate point of data point obtains interfering frequency, and between two points intersected by threshold value and spectrum signal, data point number obtains jamming bandwidth.
In described step (3), described inquiry filter coefficient comprises: the narrowband interfering frequencies provided and jamming bandwidth are tabled look-up, first inquire corresponding sublist according to jamming bandwidth, the configuration coefficients of then inquiring about this sublist according to interfering frequency and obtain needed for current time zone digital notch filter.
In described step (4), described time-domain digital notch filter configuration comprises:
When there is not interference, needing to arrange time-domain digital notch filter module is Bypass pattern, makes the digital signal being input to time-domain digital notch filter unit directly deliver to the output of time-domain digital notch filter unit;
When interference is present, upgrade time-domain digital notch filter coefficient, and this filter mode is set to mode of operation, the signal now exported is filtered signal.
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 time-domain digital notch filter, has and realizes simple and reliable, that real-time is good advantage, have the good market competitiveness.
Accompanying drawing explanation
Fig. 1 is that Suppression of narrow band interference device provided by the invention realizes the location drawing in 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, arrowband 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 specifically described.
Fig. 1 is that Suppression of narrow band interference device provided by the invention realizes the location drawing in OFDM receiver.After Suppression of narrow band interference device provided by the invention is positioned at Digital IF Processing as seen from the figure, before base band demodulating process.Effectively can be strengthened the ability of OFDM receiver anti-arrowband interference to the process of narrow-band interference signal by this device.
Device specific embodiments provided by the invention as shown in Figure 2, comprises arrowband interference search unit 201, time-domain digital notch filter generation unit 202 and time-domain digital notch filter unit 203.
First described arrowband interference search unit 201 carries out fast Fourier transform process to the baseband digital signal of input, obtain the mould of frequency-region signal, then to the smoothing filtering process of frequency-region signal mould, determine in current demand signal, whether to there is arrowband interference by the threshold value of setting, if there is arrowband interference, the characteristic informations such as the interfering frequency suppressed needed for obtaining and jamming bandwidth, for time-domain digital notch filter generation unit, testing result can be reported to base station processor simultaneously.
Filter coefficient table during described time-domain digital notch filter coefficient generating unit 202 stores according to characteristic information inquiries such as the arrowband interference narrowband interfering frequencies that provides of search unit and jamming bandwidths, obtain corresponding filter coefficient, deliver to time-domain digital notch filter unit and carry out coefficient configuration.
Described time-domain digital notch filter unit 203 is the digital notch filter (such as Notch filter etc.) of a group or the cascade of many groups, its default conditions are Bypass state (baseband digital signal of this this unit of state to input does not carry out filtering, directly exports to base band demodulating process).After the coefficient of configuration needed for sending here when time domain digital notch filter coefficient generating unit 202, first coefficient is configured in corresponding coefficient register, then be starting state by Bypass Status Change, now filter starts to carry out filtering to the baseband signal of input.If after arrowband interference search unit 201 detects interference signal characteristic change, time-domain digital notch filter coefficient generating unit 202 can send one group of new filter coefficient to this unit again, now only needs the coefficient register upgrading this unit just can carry out filtering to new interference signal.
Following table 1 gives the time-domain digital notch filter filter coefficient list structure that coefficient generating unit is tabled look-up required.
Table 1
In order to reduce table in data volume two thus shorten table look-up the time, carried out following process: suppose that base-band signal spectrum bandwidth is B, interference fringe width values is elected as the N decile of spectral bandwidth, namely 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 is chosen as B, interfering frequency can only be chosen as 0.Table look-up first according to the sublist of jamming bandwidth inquiry for jamming bandwidth, the coefficient of then configuration needed for interfering frequency inquiry finally in obtained sublist.This coefficient table can select situation to calculate the filter coefficient of each correspondence for above-mentioned all bandwidth sum interfering frequencies by various simulation software.
Above-mentioned Suppression of narrow band interference device can be integrated in FPGA, ASICs, High Performance DSP device or other processors.
A kind of narrow-band interference rejection method is present invention also offers based on said apparatus.Fig. 3 gives the flow chart of the method for the invention.
Step 301: N number of data point of sampling from supplied with digital signal (N is the power of 2, may be selected to be 512,1024 etc.) carries out fast Fourier transform, obtains the frequency-region signal of current supplied with digital signal.
Step 302: to the smoothing filtering process of the mould of frequency-region signal, then according to setting limits value detect arrowband disturbed condition, be greater than threshold value for there is arrowband interference, otherwise for there is not arrowband interference.For the situation that there is arrowband interference, obtain narrowband interfering frequencies and jamming bandwidth, its method is: between two points intersected by threshold value and spectrum signal, the intermediate point of data point obtains interfering frequency, and between two points intersected by threshold value and spectrum signal, data point number obtains jamming bandwidth.If demand can also by arrowband interference characteristic situation signals base controller.
Step 303: according to the testing result of 302, judges whether to there is arrowband interference.If existed, show to need to carry out filtering process, now jump to 305; Otherwise represent and do not need to carry out filtering process, directly jump to 304.
Step 304: when there is not interference, needing to arrange time-domain digital notch filter module is Bypass pattern, make the digital signal being input to time-domain digital notch filter unit directly deliver to the output of time-domain digital notch filter unit, then return step 301.
Step 305: the narrowband interfering frequencies that recording step 302 detects and jamming bandwidth situation, to table look-up use as bottom-ranked unit.
Step 306: carrying out tabling look-up according to 305 narrowband interfering frequencies provided and jamming bandwidth, (this tables of data is generated by simulation software, be stored in memory, shown in table format table 1), first inquire corresponding sublist according to jamming bandwidth, the configuration coefficients of then inquiring about this sublist according to interfering frequency and obtain needed for current time zone digital notch filter.
Step 307: configuration time-domain digital notch filter coefficient, and this filter mode is set to mode of operation.
Above-described is only the preferred embodiment of the present invention, it should be pointed out that for the person of ordinary skill of the art, and without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (1)
1. the Suppression of narrow band interference device of an OFDM receiver, this device is positioned on OFDM receiver, between intermediate frequency process module and baseband processing module, it is characterized in that, it comprises arrowband interference search unit, time-domain digital notch filter coefficient generating unit and time-domain digital notch filter unit;
First described arrowband interference search unit carries out fast Fourier transform process to the baseband digital signal of input, obtain the mould of frequency-region signal, then to the smoothing filtering process of frequency-region signal mould, determine in current demand signal, whether to there is arrowband interference by the threshold value of setting, if there is arrowband interference, obtain interfering frequency and the jamming bandwidth characteristic information of required suppression, for time-domain digital notch filter generation unit, testing result can be reported to base station processor simultaneously;
Filter coefficient table during described time-domain digital notch filter coefficient generating unit stores according to the arrowband interference narrowband interfering frequencies that provides of search unit and the inquiry of jamming bandwidth characteristic information, obtain corresponding filter coefficient, deliver to time-domain digital notch filter unit and carry out coefficient configuration;
Described time-domain digital notch filter unit is the Notch filter of a group or the cascade of many groups, its default conditions are Bypass state, the baseband digital signal of this this time-domain digital of state notch filter unit to input does not carry out filtering, directly exports to base band demodulating process; After the coefficient of configuration needed for sending here when time domain digital notch filter coefficient generating unit, first coefficient is configured in corresponding coefficient register, then be starting state by Bypass Status Change, now time-domain digital notch filter unit starts to carry out filtering to the baseband signal of input; If after arrowband interference search unit detects interference signal characteristic change, time-domain digital notch filter coefficient generating unit can send one group of new filter coefficient to time-domain digital notch filter unit again, now only needs the coefficient register upgrading time-domain digital notch filter unit just can carry out filtering to new interference signal;
Base-band signal spectrum bandwidth is B, interference fringe width values is elected as the N decile of spectral bandwidth, namely 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 is chosen as B, interfering frequency can only be chosen as 0; First according to the sublist of jamming bandwidth inquiry for jamming bandwidth, the coefficient of then configuration needed for interfering frequency inquiry finally in obtained sublist; This coefficient table can select situation to calculate the filter coefficient of each correspondence for above-mentioned all bandwidth sum interfering frequencies by various simulation software.
2
.a narrow-band interference rejection method for the Suppression of narrow band interference device of OFDM receiver according to claim 1, it is characterized in that, it comprises the steps:
(1), obtain input base-band signal spectrum: fast Fourier transform is carried out to the baseband signal of input, obtain input base-band signal spectrum;
(2), determine arrowband interference characteristic: after the smoothing filtering process of mould to the input base-band signal spectrum obtained, compare with the threshold value of setting, judge whether output signal exists arrowband interference, and obtain its interfering frequency and jamming bandwidth;
(3), filter coefficient is determined: according to interfering frequency and the jamming bandwidth of arrowband interference, select the filter coefficient matched by tabling look-up;
(4), filter is configured: be configured in time-domain digital notch filter unit by obtained filter coefficient.
3
.the narrow-band interference rejection method of OFDM receiver according to claim 2, it is characterized in that, in described step (2), interference determination methods in arrowband comprises: to the smoothing filtering process of the mould of frequency-region signal, then according to setting limits value detect arrowband disturbed condition, be greater than threshold value for there is arrowband interference, otherwise for there is not interference.
4
.the narrow-band interference rejection method of OFDM receiver according to claim 2, is characterized in that, in described step (2), arrowband interference characteristic acquisition methods comprises: in the presence of interference, obtains narrowband interfering frequencies and jamming bandwidth; Between two points intersected by threshold value and spectrum signal, the intermediate point of data point obtains interfering frequency, and between two points intersected by threshold value and spectrum signal, data point number obtains jamming bandwidth.
5
.the narrow-band interference rejection method of OFDM receiver according to claim 2, it is characterized in that, in described step (3), describedly determine that filter coefficient comprises: the narrowband interfering frequencies provided and jamming bandwidth are tabled look-up, first inquire corresponding sublist according to jamming bandwidth, the configuration coefficients of then inquiring about this sublist according to interfering frequency and obtain needed for current time zone digital notch filter unit.
6
.the narrow-band interference rejection method of OFDM receiver according to claim 2, is characterized in that, in described step (4), described time-domain digital notch filter configuration comprises:
When there is not interference, needing to arrange time-domain digital notch filter unit is Bypass pattern, makes the digital signal being input to time-domain digital notch filter unit directly deliver to the output of time-domain digital notch filter unit;
When interference is present, upgrade time-domain digital notch filter coefficient, and this filter mode is set to mode of operation, the signal now exported is filtered signal.
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| CN103248395A (en) * | 2012-02-09 | 2013-08-14 | 中兴通讯股份有限公司 | Narrow-band interference suppression method and device |
| CN104144138B (en) * | 2013-05-10 | 2018-01-26 | 钜泉光电科技(上海)股份有限公司 | Adaptive single-frequency arrowband interference notch filter device and double frequency filter apparatus |
| 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 |
| CN103634026B (en) * | 2013-12-02 | 2015-07-08 | 集美大学 | Digital zero intermediate frequency self-adaptation wave trapping method based on FPGA (filed programmable gate array) |
| US10362584B2 (en) * | 2015-02-06 | 2019-07-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Management and mitigation of narrowband interference |
| EP3472940B1 (en) * | 2016-06-15 | 2020-04-08 | Telefonaktiebolaget LM Ericsson (PUBL) | Radio communication receiver and method for configuring a notch filter of the radio communication receiver |
| CN109991627B (en) * | 2017-12-29 | 2022-06-07 | 上海司南卫星导航技术股份有限公司 | Narrow-band interference suppression method and module |
| CN108390840A (en) * | 2018-04-23 | 2018-08-10 | 清华大学 | Detect the frequency modulated signal demodulating system of narrowband interference or channel variation |
| CN110493860B (en) * | 2018-05-14 | 2022-09-16 | 海能达通信股份有限公司 | Multimode communication method, mobile terminal and storage medium |
| CN109768810B (en) * | 2019-03-07 | 2021-01-08 | 维沃移动通信有限公司 | Signal processing circuit, terminal equipment and signal processing method |
| CN115552856A (en) * | 2020-05-15 | 2022-12-30 | 华为技术有限公司 | Method and communication device for isolating narrow-band interference |
| 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 |
| CN113740678A (en) * | 2021-08-02 | 2021-12-03 | 中国电力科学研究院有限公司 | Noise reduction method and system suitable for corona current measurement data |
| CN115133940A (en) * | 2022-06-28 | 2022-09-30 | 恒玄科技(上海)股份有限公司 | Method and device for inhibiting Bluetooth interference in WiFi signal and signal receiving and transmitting device |
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