CN116886113A - Receiving end multi-interference signal rapid detection and nonlinear suppression circuit - Google Patents
Receiving end multi-interference signal rapid detection and nonlinear suppression circuit Download PDFInfo
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Abstract
The application discloses a receiving end multi-interference signal rapid detection and nonlinear suppression circuit, which comprises a rapid interference frequency point positioning module, a baseband signal receiving module and a two-step method, wherein the two-step method comprises preliminary frequency point positioning of a power threshold and high-precision frequency point positioning; the nonlinear reference signal generation module receives the baseband signal and the interference frequency point position information and generates nonlinear reference signals; and the self-adaptive elimination module receives the nonlinear reference signal, receives the baseband signal through the delay module, and filters out the corresponding nonlinear item after aligning the data to finish the elimination of the interference signal. The method is used for rapidly detecting the frequency point of the narrow-band interference signal in the frequency band, and filtering nonlinear signals generated by the interference signal such as common secondary or tertiary nonlinearity and the like through a normalized adaptive (GNGA) algorithm.
Description
Technical Field
The application relates to the technical field of mobile communication, in particular to a receiving end multi-interference signal rapid detection and nonlinear suppression circuit.
Background
The 5G system is compatible with terminals such as GSM, WCDMA, LTE with multiple standards and multiple frequency bands, and has been widely used in various terminals and base stations due to the advantages of simple structure, flexibility, low cost and the like of the down-conversion DCR (Direct Conversion Receive) at the receiving end. However, this structure also introduces some problems to be solved, such as IQ Imbalance (IQ Imbalance) caused by the difference between IQ two-way devices, which makes the signal generate an image signal, and the image signal needs to be suppressed under a certain standard in order to improve the communication quality.
In addition, the signal passes through some devices to generate nonlinear problem (Non-Linear), so that the signal is distorted, and intra-signal and inter-signal interference is generated, thereby reducing the communication quality, and in extreme cases, even completing communication cannot be performed. These nonlinear distortions mainly include intermodulation distortion IMD (Inter Modulation Distortion) and harmonic distortion HD (Harmonic Distortion). The devices causing nonlinear distortion at the Rx end are mainly low noise amplifiers LNA (Low Noise Amplifier) and ADC (Analog to Digital Converter), the former is generally called radio frequency nonlinearity (RF Non-linear), and the latter is called baseband nonlinearity (BB Non-linear). The nonlinear interference generated by superposition of the two types is mainly divided into 2 types of self-interference and mutual interference, and the problem of nonlinearity of a Low Intermediate Frequency (LIF) narrowband signal is emphasized and a solution is provided due to the fact that expected signals required under different scenes are inconsistent.
Disclosure of Invention
The application aims to provide a receiving-end multi-interference signal rapid detection and nonlinear suppression circuit so as to solve the technical problem of how to suppress nonlinear interference generated by signals.
The application is realized by adopting the following technical scheme: a receiving end multi-interference signal rapid detection and nonlinear suppression circuit comprises a rapid interference frequency point positioning module, a nonlinear reference signal generating module, an adaptive elimination module and a delay module, wherein,
the interference frequency point quick positioning module receives the baseband signal and adopts a two-step method to quickly position the interference frequency point, wherein the two-step method comprises preliminary frequency point positioning of a power threshold and high-precision frequency point positioning;
the nonlinear reference signal generation module receives the baseband signal and the interference frequency point position information and generates nonlinear reference signals;
and the self-adaptive elimination module receives the nonlinear reference signal, receives the baseband signal through the delay module, and filters out the corresponding nonlinear item after aligning the data to finish the elimination of the interference signal.
Further, the preliminary frequency point positioning of the power threshold comprises a first data memory, a first FFT calculation module, a frequency point calculation module and a preliminary frequency point output set which are sequentially connected.
Further, the method for positioning the preliminary frequency point of the power threshold comprises the following steps: the data storage receives baseband signals and stores the baseband signals, after the stored data are calculated to obtain a frequency spectrum by using the FFT calculation module, the frequency point calculation module searches the position meeting the power threshold in the whole section of the frequency spectrum, converts the position information into frequency points and stores the frequency points in the primary frequency point output set, and if the set is empty, the data acquisition is carried out again according to the time interval of the timer.
Further, the high-precision frequency point positioning comprises an NCO frequency point controller, an NCO generator, a programmable low-pass filter pLPF, a decimation module, a second data memory, a second FFT calculation module and a high-precision frequency point output set which are connected in sequence.
Further, the method for positioning the high-precision frequency point comprises the following steps: and (3) introducing one interference frequency point in the preliminary frequency point output set into an NCO generator each time through an NCO frequency point controller, generating a digital NCO, multiplying the digital NCO by a multiplier, moving the signal to a zero frequency, performing downsampling through a programmable low-pass filter pLPF, storing through a second data memory, performing fast Fourier transform through a second FFT calculation module, improving frequency resolution, obtaining more accurate interference frequency point position information, and storing in a high-precision frequency point output set.
Further, the nonlinear reference signal generating module comprises a programmable band-pass filter pBPF, and the nonlinear reference signal is directly filtered out through the programmable band-pass filter pBPF.
Further, the nonlinear reference signal generating module comprises a negative frequency shifter and a positive frequency shifter, and a programmable low pass filter pLPF is arranged between the negative frequency shifter and the positive frequency shifter to filter out-of-band signals of the interference source, so that nonlinear reference signals are obtained.
Further, the adaptive cancellation module comprises a plurality of adaptive filters, the adaptive filters are connected with the nonlinear reference signal generation module, are connected with each nonlinear reference signal, are connected with the baseband signal through the delay module, and are used for filtering corresponding nonlinear items through the adder after aligning data, so that the cancellation of interference signals is completed.
A receiving-transmitting circuit, a receiving-end multi-interference signal rapid detection and nonlinear suppression circuit.
A mobile terminal or a base station comprises the transceiver circuit.
The application has the beneficial effects that: the method is used for rapidly detecting the frequency point of the narrow-band interference signal in the frequency band, and filtering nonlinear signals generated by the interference signal such as common secondary or tertiary nonlinearity and the like through a normalized adaptive (GNGA) algorithm.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the present application;
FIG. 2 is a schematic diagram of a fast positioning module for interference frequency points;
FIG. 3 is a schematic diagram of preliminary interference frequency point location;
FIG. 4 is a preliminary scrambling frequency point calculation flow;
FIG. 5 is a schematic diagram of a high-precision dry scrambling point acquisition;
FIG. 6 is a schematic diagram of a nonlinear reference signal generation module and an adaptive cancellation module;
FIG. 7 is a digital shift schematic;
FIG. 8 is an effect of a nonlinear portion of an interfering signal on a desired signal;
FIG. 9 is a graph of signal requirements for co-channel interference and zero-frequency interference;
FIG. 10 is a diagram of a typical scenario in which interference signals are generated due to distance;
FIG. 11 is a block diagram of a down-conversion DCR receiver;
FIG. 12 is a graph of a single tone secondary nonlinear measured comparison;
fig. 13 is a graph showing comparison of narrow-band secondary nonlinear measurements.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Example 1
Referring to fig. 1, a receiving-end multi-interference signal fast detection and nonlinear suppression circuit includes a fast interference frequency point positioning module 201, a nonlinear reference signal generating module 202, an adaptive cancellation module 204, and a delay alignment data module 203, wherein a delay estimation module is designed in the adaptive cancellation module 204.
Referring to fig. 2, the interference signal frequency point is quickly located by using a 2-step method in the fast interference frequency point locating module 201, wherein the 2-step method is respectively a power threshold preliminary frequency point locating 301 and a high-precision frequency point locating 302, and the principle of the power threshold preliminary frequency point locating 301 is shown in fig. 3, and the principle includes a data buff 401 with a storage length of L, an FFT computing module 402 based on an FPGA, a frequency point computing module 403, and a frequency point set 404 stored according to the power threshold.
The process flow of the preliminary frequency point positioning 301 of the power threshold is shown in fig. 4: firstly, receiving a signal with the length L, storing the signal in a buff, calculating data to obtain a frequency spectrum Y (F) by using hardware FFT, searching a position meeting a power threshold in the whole section of spectrum, converting position information into frequency points and storing the frequency points in a stored frequency point set 404F LP In the case of set F LP And if the data is empty, the data is acquired again according to the time interval of the timer.
After the fast interference frequency point positioning is completed, the frequency resolution is lower, the frequency point error is larger, and the frequency point position needs to be further accurate due to the relation of the sampling rate and the bandwidth, so the application adopts the high-precision frequency point positioning 302, and the principle is as shown in fig. 5, and the application comprises an NCO frequency point controller 501, an NCO generator 502, a programmable low-pass filter pLPF503, an M point extraction module 504, a data acquisition module 505, a hardware N point FFT calculation module 506 and a high-precision interference frequency point output set 507.
The process flow of the high-precision frequency point positioning 302 is as follows: using NCO frequency point controller 501, one interference frequency point at a time is imported into NCO generator 502, and digital NCO is generated, the output expression isThe main function of the method is that after the signal is moved to the zero frequency through the NCO frequency point controller 501 and the NCO generator 502 and passes through the programmable low-pass filter pLPF503, the sampling rate and the bandwidth are reduced by using the M-point downsampling extraction module 504, so that the frequency resolution is improved under the same N-point FFT calculation module 506, and therefore, more accurate interference frequency point positions can be obtained, and high-precision frequency points are stored in the high-precision interference frequency point output set 507.
Referring to fig. 6, the nonlinear reference signal generating module 202 includes a real-time programmable bandpass filter pBPF (or programmable lowpass filter) and an adaptive cancellation module 204 is used to filter out the corresponding nonlinear signal using the nonlinear reference signal generating module 202Lpf) and digital up-down shifter 601 and a set of signal multipliers 602 and a set of control switches in front of them. Wherein, the digital up-down shifter 601 is shown in FIG. 7, which includes two sets of NCO generators similar to NCO generator 502 but which are one negative shiftAnd a forward shift frequency +.>The adaptive cancellation module 204 is an adaptive filter, and each nonlinear reference signal, such as y, is first obtained by the nonlinear reference signal generating module 202 2 (n) it is sufficient to gate it by a switch, and then update the adaptive filter tap W by a normalized adaptive algorithm 2 And after aligning the data by using the delay module 203, the corresponding nonlinear term is filtered out, thereby completing the elimination of the interference signal.
Effect of nonlinear part of interfering signal on desired signal:
a typical interference signal point nonlinearity affects the desired signal a and desired signal B, as can be seen in fig. 8 for a multi-standard compatibility, the received signal is at f 0 Where it is at 2f due to nonlinear effects 0 The secondary nonlinear interference generated there disturbs the demodulation of the desired signal, and the interference is generally divided into 2 kinds of co-channel interference and zero-frequency interference. While figure 9 shows the requirements for both types of interference that a signal can normally demodulate in a typical narrowband application. The wanted signal should be greater than the interfering signal by more than 9dB at the same frequency, respectively, whereas the wanted signal is at f at zero frequency central The interference signal on the + -200 KHz sideband must not be 9dB higher than the desired signal, at f central The + -400 KHz should not be higher than 41dB. Finally at f central And must not be higher than 49dB in the + -600 KHz range.
Fig. 10 shows a typical non-linear interference scenario at the receiving end, where the signal arrives at the base station with less power and the signal transmitted by the user 1 is closer to the base station with more power at the receiving site of the base station, because the user 2 is farther from the base station or the communication with the base station is non-line of sight propagation. In addition, when the base station spectrum is allocated, the spectrum of the user 1 is located before the user 2, and the situation of the two signals at the receiving end can be described by using the spectrum diagram of fig. 4, so that the nonlinearity of the interference signal at the Rx end needs to be reasonably suppressed.
The working principle of the present application is illustrated by taking the low intermediate frequency receiving end as an example, and the present application is an interference nonlinear suppression module 109 (INC) in the down-conversion DCR receiving end:
referring to fig. 11, the dcr receiver may operate in a Zero Intermediate Frequency (ZIF) or Low Intermediate Frequency (LIF) mode, and the present application mainly discusses the case of operating in LIF. The system 100 mainly comprises a low noise amplifier 101 (LNA), a set 102,103 of Local Oscillators (LOs), which are identical in frequency and 90 ° out of phase, a pair of low pass filters 104,105 (LPF) and two analog-to-digital converters 106,107 (ADC), the output of which has a digital processing block 108, and an interference non-linear suppression block 109 (INC) which is part of the digital structure 108.
The received signal after passing through LNA 101 may be represented asz (t) is a baseband signal, f c E is a natural number, j is an imaginary part, and t is time. After respectively passing through the orthogonal local oscillators 102 and 103, the carriers are removed, and low intermediate frequency I and Q paths are separated through the low-pass filters 104 and 105 and respectively expressed as an I path expression x I ＝(z(t)e j△wt +z * (t)e -j△wt ) 2, Q-way expression x Q ＝(z(t)e j△wt -z * (t)e -j△wt ) Wherein angular frequency Δw=2pi (f c -f L )，f L Is the local frequency. Two paths of data are collected by using ADCs 106,107 and sent to a digital processing module 108 for processing, typically a combination of FPGA and ARM 108. The FPGA is used for channel digital processing and the ARM is generally responsible for scheduling and some data configuration and non-time efficient intermediate computation processes, whereas the INC 109 of the present application is located in this module. The processed numbers can be directly sent to the baseband for processing by the interface 108, so that the processing of the whole channel is completed, and other digital processing has similar processes.
In the above process, the signal is introduced at each harmonic frequency due to the nonlinearity of the channel analog device, which can be expressed as:
can be set g in general 1 =1, andindicating convolution, the baseband signal output at this time is expressed as:
y(n)＝y I (n)+jy Q (n)；
the cancellation principle is as follows, which is first rewritten as an expression of the baseband signal:
and filtering the specified interference signal and generating a reference signal, and obtaining a corresponding nonlinear term filter by using a normalized adaptive filter. The second order nonlinearity can be expressed as:
finally, fig. 12 and fig. 13 show the situations of the method that the single tone and the narrow band inhibit the secondary nonlinearity under actual measurement, and it can be seen that the secondary nonlinearity is effectively inhibited.
The application can effectively detect whether a large-point interference signal exists in a band or not through the quick interference frequency point positioning module 201, and quickly position the interference frequency point by using a two-step method; the nonlinear reference signal can be obtained by the nonlinear reference signal generating module 202; finally, nonlinear terms are filtered out by the adaptive cancellation module 204. Experiments and simulations prove that the method can quickly locate the frequency point of the interference signal and can well inhibit nonlinear interference generated by the signal. The method is used for rapidly detecting the frequency point of the narrow-band interference signal in the frequency band, and filtering nonlinear signals generated by the interference signal such as common secondary or tertiary nonlinearity and the like through a normalized adaptive (GNGA) algorithm.
It should be noted that the terms "coupled," "configured," and "arranged" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, features defining "connected", "arranged" may explicitly or implicitly include one or more such features. Moreover, the terms "connected," "configured," and the like are used to distinguish between similar objects and do not necessarily describe a particular order or sequence. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. And for the foregoing embodiments, a series of combinations of actions are described for simplicity of description, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application. Further, it should be understood by those skilled in the art that the embodiments described in the specification are preferred embodiments and that the actions involved are not necessarily required for the present application.
In the above embodiments, the basic principle and main features of the present application and advantages of the present application are described. It will be appreciated by persons skilled in the art that the present application is not limited by the foregoing embodiments, but rather is shown and described in what is considered to be illustrative of the principles of the application, and that modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the application, and therefore, is within the scope of the appended claims.
Claims (10)
1. A receiving end multi-interference signal rapid detection and nonlinear suppression circuit is characterized by comprising a rapid interference frequency point positioning module, a nonlinear reference signal generating module, an adaptive elimination module and a delay module, wherein,
the interference frequency point quick positioning module receives the baseband signal and adopts a two-step method to quickly position the interference frequency point, wherein the two-step method comprises preliminary frequency point positioning of a power threshold and high-precision frequency point positioning;
the nonlinear reference signal generation module receives the baseband signal and the interference frequency point position information and generates nonlinear reference signals;
and the self-adaptive elimination module receives the nonlinear reference signal, receives the baseband signal through the delay module, and filters out the corresponding nonlinear item after aligning the data to finish the elimination of the interference signal.
2. The rapid detection and nonlinear suppression circuit for multi-interference signals at a receiving end according to claim 1, wherein the preliminary frequency point positioning of the power threshold comprises a first data memory, a first FFT calculation module, a frequency point calculation module and a preliminary frequency point output set which are connected in sequence.
3. The rapid detection and nonlinear suppression circuit for multi-interference signals at a receiving end as claimed in claim 2, wherein the method for positioning the preliminary frequency point of the power threshold is as follows: the data storage receives baseband signals and stores the baseband signals, after the stored data are calculated to obtain a frequency spectrum by using the FFT calculation module, the frequency point calculation module searches the position meeting the power threshold in the whole section of the frequency spectrum, converts the position information into frequency points and stores the frequency points in the primary frequency point output set, and if the set is empty, the data acquisition is carried out again according to the time interval of the timer.
4. The rapid detection and nonlinear suppression circuit for multi-interference signals at a receiving end according to claim 3, wherein the high-precision frequency point positioning comprises an NCO frequency point controller, an NCO generator, a programmable low-pass filter pLPF, a decimation module, a second data memory, a second FFT calculation module and a high-precision frequency point output set which are connected in sequence.
5. The rapid detection and nonlinear suppression circuit for multi-interference signals at a receiving end as claimed in claim 4, wherein the method for positioning the high-precision frequency point is as follows: and (3) introducing one interference frequency point in the preliminary frequency point output set into an NCO generator each time through an NCO frequency point controller, generating a digital NCO, multiplying the digital NCO by a multiplier, moving the signal to a zero frequency, performing downsampling through a programmable low-pass filter pLPF, storing through a second data memory, performing fast Fourier transform through a second FFT calculation module, improving frequency resolution, obtaining more accurate interference frequency point position information, and storing in a high-precision frequency point output set.
6. The rapid detection and nonlinear suppression circuit for multi-interference signals at a receiving end as claimed in claim 1, wherein the nonlinear reference signal generating module comprises a programmable bandpass filter pBPF, and the nonlinear reference signal is directly filtered out by the programmable bandpass filter pBPF.
7. The rapid detection and nonlinear suppression circuit for multi-interference signals at a receiving end as claimed in claim 1, wherein the nonlinear reference signal generation module comprises a negative frequency shifter and a positive frequency shifter, and a programmable low pass filter pLPF is arranged between the negative frequency shifter and the positive frequency shifter to filter out-of-band signals of an interference source, thereby obtaining nonlinear reference signals.
8. The rapid detection and nonlinear suppression circuit for multi-interference signals at a receiving end as claimed in claim 1, wherein the adaptive cancellation module comprises a plurality of adaptive filters, the adaptive filters are connected with the nonlinear reference signal generation module, each nonlinear reference signal is accessed, the baseband signal is accessed through the delay module, and after aligning data, the corresponding nonlinear term is filtered through the adder, thereby completing the cancellation of the interference signals.
9. A transceiver circuit, characterized in that a receiving-end multi-interference signal rapid detection and nonlinear suppression circuit according to any one of claims 1-8 is adopted.
10. A mobile terminal or base station comprising the transceiver circuitry of claim 9.
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