CN103368589A - Interference inhibition method, interference inhibition device and receiver - Google Patents
Interference inhibition method, interference inhibition device and receiver Download PDFInfo
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Abstract
The invention relates to an interference inhibition method, an interference inhibition device and a receiver. The interference inhibition method comprises receiving an interfered signal which include a useful signal and an interference signal; obtaining a frequency mixing signal by carrying out frequency mixing and low-pass filtering on the received interfered signal and a local oscillation signal of the receiver; obtaining a filtering signal by carrying out channel selecting filtering on the frequency mixing signal; calculating the signal to noise ratio of the filtering signal; and continuing to receive the interfered signal when the signal to noise ratio satisfies an acceptance requirement, or adjusting frequency of the local oscillation signal of the receiver and then continuing to receive the interfered signal when the signal to ratio does not satisfy the acceptance requirement. Whether to change the frequency of the local oscillation signal is determined by continuous detection of the signal to noise ratio of the filtering signal based on characteristic of signal inhibition of a channel selection filter, and the local oscillation signal is adjusted through an algorithm in the technical scheme of the invention to enable the frequency of a combined interference signal passing a down-conversion unit to be beyond the passband range of the channel selection filter, thereby inhibiting the interference signal.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of disturbance restraining method, device and receiver.
Background technology
Receiver is the important composition unit in the Modern Communication System, its Main Function is that the electromagnetic wave of the different frequency that receives from the space is screened, extract useful signal and carry out frequency conversion, amplification, then give the demodulator demodulation baseband signal that satisfies certain signal to noise ratio requirement.The useful signal that receives in the practical communication system is often fainter, also has simultaneously a lot of interference signals to follow wherein, and therefore, sensitivity and selectivity just become the leading indicator of weighing receiver performance.Existing receiver comprises three kinds: superheterodyne receiver, zero intermediate frequency reciver and low intermediate frequency receiver.
The useful signal that above-mentioned all kinds of receiver antenna receives generally has minimum channel width and higher frequency, need to use frequency mixer with the high-frequency signal frequency reducing that receives, carry out channel filtering, amplification and demodulation in IF-FRE, but this has introduced again the image signal interference.Particularly, if the frequency of the frequency of first signal and secondary signal is distributed in the both sides of local oscillation signal frequency symmetrically, then pass through mixing after, the frequency of first signal and the frequency of secondary signal all will be shifted to same IF-FRE.If one of them is useful signal for first signal and secondary signal, another is interference signal, and the frequency at interference signal place just is called the frequency of image signal so, and the interference phenomenon after the mixing of this process is called image signal and disturbs.
Ieee standard 802.16e-2005 has stipulated the receiver requirement at the 8.3.11 item, the requirement that wherein the receiver mirror image is suppressed is: receiver should be able to provide the mirror image of minimum 60dB to suppress, and must comprise in all conditions mirror that are created in receiver radio frequency and intermediate frequency thereafter.Therefore, a major challenge of receiver radio frequency Front-end Design is how to realize that sufficiently high mirror image suppresses.The method of at present extensive use is the complex mixing system, is about to sinusoidal signal by a quadrature phase shifter, obtains the local oscillation signal of two quadratures, sends into respectively two frequency mixers, thereby obtains input signal through the intermediate-freuqncy signal behind the complex mixing.
For superheterodyne receiver, it needs the image-reject filter of a high quality factor.So-called quality factor are to characterize an energy storage device (such as inductance coil, electric capacity etc.), the same weekly a kind of quality index of the ratio of loss of energy of resonant circuit stored energy.The quality factor of element are larger, and are better with the selectivity of the circuit of this element composition or network.Yet this image-reject filter is difficult to realize in integrated circuit.
For zero intermediate frequency reciver, although it does not need image-reject filter, because the centre frequency of local oscillation signal and useful signal is identical, produces comparatively serious direct current problem through meeting behind the frequency mixer, and be difficult to filtering.
By contrast, low intermediate frequency receiver and zero intermediate frequency reciver form are more approaching, both differences are that the local oscillation signal of low intermediate frequency receiver employing is different with the useful signal centre frequency, there is less difference, this difference is generally at half channel width (BW, Band Width) between the channel width, i.e. BW/2＜f
IF＜BW.The low intermediate frequency receiver of employing complex mixing technology can suppress the interference of image signal effectively, and the direct current signal amplitude of output is less simultaneously, relatively easier filtering.Therefore adopt low intermediate frequency receivers in the reception programme of mobile phone at present more.
Yet, the inventor finds, because low intermediate frequency receiver has adopted aforementioned complex mixing technology with two signal path, will inevitably owing to fabrication error cause signal path the gain and phase place on not mating, cause adopting the mobile phone of low intermediate frequency receiver scheme testing authentication and the decline of actual use medium sensitivity, even the call drop phenomenon occurs.
More disturbance restraining methods about communication technical field can be the U.S. patent documents US2009010366A1 of " suppressing the method and apparatus that the arrowband disturbs " (Method And Device For Suppressing Narrowband Interference) with reference to denomination of invention, but still do not address the above problem.
Summary of the invention
The problem that technical solution of the present invention solves is the interference that the receiver of available technology adopting complex mixing technology is subjected to outer signals, and sensitivity descends, and the call drop phenomenon easily occurs.
For addressing the above problem, technical solution of the present invention provides a kind of disturbance restraining method, comprising:
Receive disturbed signal, described disturbed signal comprises useful signal and interference signal;
The disturbed signal that receives and the local oscillation signal of receiver are obtained mixed frequency signal after mixing and low-pass filtering treatment;
Described mixed frequency signal is carried out channel selects filtering to obtain filtering signal;
Calculate the signal to noise ratio of described filtering signal;
Receive requirement when described signal to noise ratio satisfies, continue to receive disturbed signal; Receive requirement when described signal to noise ratio does not satisfy, the follow-up continued access of frequency of the local oscillation signal of adjustment receiver is received and is disturbed signal.
Alternatively, the frequency initial value of described local oscillation signal is set as centre frequency and the IF-FRE sum of useful signal.
Alternatively, the satisfied reception of described disturbed signal requires to comprise that the signal to noise ratio of described filtering signal is greater than default thresholding; Described disturbed signal does not satisfy reception and requires to comprise that the signal to noise ratio of described filtering signal is less than described default thresholding.
Alternatively, described default thresholding is less than or equal to the demodulation threshold of baseband chip.
Alternatively, described when the satisfied reception requirement of described signal to noise ratio, the follow-up continued access of frequency of adjusting the local oscillation signal of receiver is received and is disturbed signal and comprise: when described signal to noise ratio less than described default thresholding, if the frequency of current local oscillation signal is centre frequency and the IF-FRE sum of useful signal, then be the poor of the centre frequency of useful signal and IF-FRE with the frequency setting of local oscillation signal.
Alternatively, described when the satisfied reception requirement of described signal to noise ratio, the follow-up continued access of frequency of adjusting the local oscillation signal of receiver is received and is disturbed signal and also comprise: when described signal to noise ratio less than described default thresholding, if the frequency of current local oscillation signal is the poor of the centre frequency of useful signal and IF-FRE, then the frequency setting with local oscillation signal is centre frequency and the IF-FRE sum of useful signal.
Alternatively, the signal to noise ratio of the described filtering signal of described calculating comprises carries out channel estimating with described filtering signal through after the analog-to-digital conversion, and the record signal to noise ratio.
Technical solution of the present invention also provides a kind of interference suppression equipment, comprising:
Signal receiving unit is used for receiving disturbed signal, and described disturbed signal comprises useful signal and interference signal;
Down-converter unit, the disturbed signal and the local oscillation signal that are used for described signal receiving unit is received obtain mixed frequency signal after mixing and low-pass filtering treatment;
Filter unit is used for the mixed frequency signal of described down-converter unit output is carried out channel selection filtering acquisition filtering signal;
Computing unit is for the signal to noise ratio of calculating described filtering signal;
Control unit, the signal to noise ratio that is used for obtaining when described computing unit satisfies the reception requirement, controls described signal receiving unit and continues to receive disturbed signal; The signal to noise ratio that obtains when described computing unit does not satisfy the reception requirement, and the described signal receiving unit of control continues to receive disturbed signal after the frequency of adjustment local oscillation signal.
Alternatively, described control unit comprises:
The first adjustment unit, be used for when described signal to noise ratio less than described default thresholding, and if the frequency of current local oscillation signal be centre frequency and the IF-FRE sum of useful signal, be the poor of the centre frequency of useful signal and IF-FRE with the frequency setting of local oscillation signal.
Alternatively, described control unit also comprises:
The second adjustment unit, be used for when described signal to noise ratio less than described default thresholding, and if the frequency of current local oscillation signal be the poor of the centre frequency of useful signal and IF-FRE, be centre frequency and the IF-FRE sum of useful signal with the frequency setting of local oscillation signal.
Alternatively, described computing unit comprises:
AD conversion unit, being used for described filtering signal is digital signal by analog signal conversion;
Digital signal processing unit is used for the filtering signal after described AD conversion unit conversion is carried out channel estimating, and records the signal to noise ratio of described filtering signal.
Technical solution of the present invention also provides a kind of receiver, comprises above-mentioned interference suppression equipment.
Alternatively, described receiver also comprises the local oscillator generating unit, and described local oscillator generating unit is connected in described down-converter unit and described control unit.
With respect to prior art, technical solution of the present invention has following beneficial effect: based on the characteristic of channel selection filter Inhibitory signal, treat the signal to noise ratio of described filtering signal by continuous detection, judge whether to change the frequency of local oscillation signal, and by the algorithm of adjusting the local oscillation signal frequency described in the technical solution of the present invention local oscillation signal is adjusted, frequency through the combination interference signal of down-converter unit is dropped on outside the free transmission range of channel selection filter, thus suppressed.Also overcome in addition receiver because the fabrication error of complex mixing system and the complete shortcoming of filtering image signal interference.With respect to the low intermediate frequency receiver of the local oscillation signal of existing employing fixed frequency, technical solution of the present invention has strengthened the inhibition to interference signal, has improved the antijamming capability of receiver.
Description of drawings
Fig. 1 is the schematic flow sheet of the disturbance restraining method that provides of the embodiment of the invention;
Fig. 2 is a kind of low intermediate frequency receiver structural representation;
Fig. 3 is that useful signal is through spectrum diagram before and after down-converter unit and the channel selection filter;
Fig. 4 is that desirable channel selection filter is to the inhibitory action schematic diagram of combination interference signal;
Fig. 5 is the concrete structure schematic diagram of down-converter unit among Fig. 2;
Fig. 6 is the spectrum diagram of image signal;
Fig. 7 is the particular flow sheet of the disturbance restraining method that provides of the embodiment of the invention;
Fig. 8 is the structural representation of the interference suppression equipment that provides of the embodiment of the invention;
Fig. 9 is the structural representation of the receiver that provides of the embodiment of the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here and implements with multiple, and those skilled in the art can be in the situation that do similar popularization without prejudice to intension of the present invention.Therefore the present invention is not subjected to the restriction of following public embodiment.
For the problem of prior art, the inventor provides a kind of disturbance restraining method, device and receiver through research.The below at first is explained and illustrated the term that the present invention relates to:
Channel width (BW): refer to the poor of low-limit frequency that highest frequency that channel can pass through and this channel can pass through, determined by the physical characteristic of channel.
Signal to noise ratio (signal-to-noise ratio, SNR): refer under defined terms the ratio of the available power on the transmission channel specified point and noise power.
Sensitivity: under the condition that satisfies the regulation signal to noise ratio, the minimum levels that receiver can receive.
Intermediate frequency: the difference frequency that the centre frequency of useful signal and the frequency compounding of local oscillation signal produce.
Please refer to Fig. 1, Fig. 1 is the schematic flow sheet of the disturbance restraining method that provides of the embodiment of the invention.As shown in Figure 1, described disturbance restraining method comprises:
Step S1 receives disturbed signal, and described disturbed signal comprises useful signal and interference signal;
Step S2 obtains mixed frequency signal with the disturbed signal that receives and the local oscillation signal of receiver after mixing and low-pass filtering treatment;
Step S3 carries out channel with described mixed frequency signal and selects filtering to obtain filtering signal;
Step S4 calculates the signal to noise ratio of described filtering signal;
Step S5 receives requirement when described signal to noise ratio satisfies, and continues to receive disturbed signal; Receive requirement when described signal to noise ratio does not satisfy, the follow-up continued access of frequency of the local oscillation signal of adjustment receiver is received and is disturbed signal.
Mixed frequency signal comprises combination useful signal and combination interference signal.The combination useful signal refers to the signal that useful signal is exported after mixing and low-pass filtering treatment, the combination interference signal refers to the signal that interference signal is exported after mixing and low-pass filtering treatment.
The below elaborates to above-mentioned disturbance restraining method with specific embodiment.Receiver described in the embodiment of the invention is low intermediate frequency receiver.
Please refer to Fig. 2, Fig. 2 is a kind of low intermediate frequency receiver structural representation.Low intermediate frequency receiver 100 comprises antenna element 110, band pass filter 120, radio frequency chip 130, baseband chip 140.
Need to prove, only for principle of the present invention is described, the structure of receiver may change above-mentioned receiver structure in the practical application, and for example, analog to digital converter 141 may be comprised in the baseband chip 140, also may be comprised in the radio frequency chip 130.
After the antenna element 110 of receiver gathered useful signals, described useful signal is sent to can be by the frequency component in a certain frequency range but the frequency component of other scopes is decayed to low-level band pass filter 120.If the centre frequency of useful signal is f
RX, because band pass filter 120 and desirable low noise amplifier 131 all are linear units, do not change the frequency of signal, still be f so arrive the frequency of the input of down-converter unit 132 behind useful signal process band pass filter 120 and the low noise amplifier 131
RXIn down-converter unit 132, the centre frequency of useful signal and the frequency compounding of local oscillation signal produce a difference frequency, and this difference frequency is intermediate frequency.
Specifically, please refer to Fig. 3 and in conjunction with Fig. 2, Fig. 3 is that useful signal is through spectrum diagram before and after down-converter unit and the channel selection filter.Useful signal and local oscillation signal are exported mixed frequency signal through after the down- converter unit 132, and 134 pairs of described mixed frequency signals of channel selection filter carry out channel and select filtering to process.Before input down-converter unit 132, band pass filter 120 filterings the outer part of band pass filter 120 free transmission ranges in the disturbed signal.After process down-converter unit 132, the centre frequency of useful signal is moved.
With reference to figure 4, Fig. 4 is that desirable channel selection filter is to the inhibitory action schematic diagram of combination interference signal.Interference signal is through output combination interference signal after the down-converter unit 132 shown in Figure 3, if the combination interference signal drops on outside channel selection filter 134 free transmission ranges, channel selection filter 134 can be with combination interference target signal filter (shown in left figure); If the combination interference signal drops in channel selection filter 134 free transmission ranges, channel selection filter 134 can't filtering combination interference signal (as shown at right).As described in the background art, suppress in order to realize sufficiently high mirror image, usually adopt the complex mixing system in the low intermediate frequency receiver.
In the present embodiment, described complex mixing system can adopt the structure of down-converter unit shown in Figure 5.Described down-converter unit 132 comprises that first signal is processed branch road and secondary signal is processed branch road.Described first signal is processed branch road and is comprised for the input signal of described down-converter unit and the first frequency mixer 31A of the first local oscillation signal Frequency mixing processing, the first low pass filter 32A, and for the phase-shift unit 33 that the signal phase shift-90 of described the first low pass filter 32A output is spent.Described secondary signal is processed branch road and is comprised for the input signal of described down-converter unit and the second frequency mixer 31B of the second local oscillation signal Frequency mixing processing, and the second low pass filter 32B.Described down-converter unit comprises that also the signal of described superpositing unit 34 outputs is intermediate-freuqncy signal for the superpositing unit 34 of the output signal stack of the second low pass filter 32B in the output signal of first signal being processed branch road phase-shift unit 33 and the secondary signal processing branch road.It should be noted that above-mentioned description to the down-converter unit structure can not be used for limiting protection scope of the present invention, technical solution of the present invention is equally applicable to well known to a person skilled in the art the down-converter unit of other structures.
Those skilled in the art know, and frequency mixer is a kind of nonlinear device, and the frequency of oscillation of its generation is the linear combination of the integral multiple of two-way input vibration or signal frequency.Frequency is f
RFUseful signal and frequency be f
LOThe local oscillation signal input mixer after, the frequency of described mixer output signal is m * f
RF+ n * f
LO, m * f
RF-n * f
LO,-m * f
RF-n * f
LO,-m * f
RF+ n * f
LO, (m, n are positive integer).In conjunction with Fig. 3, the first low pass filter 32A and the second low pass filter 32B are m * f with its medium frequency
RF+ n * f
LOWith-m * f
RF-n * f
LOTarget signal filter.First signal is processed wherein one tunnel signal phase shift-90 degree of branch road, therefore first signal is processed branch road and secondary signal and processed the two paths of signals stack of branch road and eliminated frequency and be-m * f
RF+ n * f
LOSignal, only remaining frequency is m * f
RF-n * f
LOSignal.
Particularly, frequency is f
RFUseful signal cos (2 π f
RFT) can be expressed as
The first local oscillation signal sin (2 π f
LOT) can be expressed as
The second local oscillation signal cos (2 π f
LOT) can be expressed as
If the gain of the first frequency mixer 31A and the second frequency mixer 31B is a, the gain of the first low pass filter 32A and the second low pass filter 32B is b, and the output signal of the first frequency mixer 31A is so:
The output terminals A point signal of the first low pass filter 32A is:
The output signal of the second frequency mixer 31B is:
The output B point signal of the second low pass filter 32B is:
Signal phase shift behind phase-shift unit 33-90 degree of the first low pass filter 32A output is equivalent to multiply by-j, obtains phase-shift unit 33 output C point signals:
The output signal addition that the output signal that phase-shift unit 33 output B are ordered and the second low pass filter 32B output C are ordered obtains:
This shows, the two paths of signals stack has been eliminated frequency and has been-m * f
RF+ n * f
LOSignal, only remaining frequency is m * f
RF-n * f
LOSignal.
Especially, the interference for image signal sees also Fig. 6, and Fig. 6 is the spectrum diagram of image signal.Frequency is f
RFThe frequency of the image signal of useful signal is:
f
IM＝f
RX+2f
IF＝f
RX+2(f
LO-f
RX)＝2×f
LO-f
RF。
Investigate when m=n=1, useful signal obtains after processing through down-converter unit:
m×f
RF-n×f
LO＝f
RF-f
LO，
Image signal obtains after processing through down-converter unit:
m×f
IM-n×f
LO＝m×(2×f
LO-f
RF)-n×f
LO＝f
LO-f
RF。
Therefore image signal can be by follow-up with f through the frequency behind the frequency mixer
RF-f
LOCentered by the low pass filter filters out of frequency.Be image signal as the interference signal of characteristic frequency, under the perfect condition, can be suppressed fully by down-converter unit.
Yet the inventor finds, adopts the mobile phone of low intermediate frequency receiver scheme in testing authentication and actual the use, and mobile phone is subjected to the interference of outer signals, and the sensitivity meeting descends, even the call drop phenomenon occurs.Analyze reason, mainly contain two aspects, a kind of is that output frequency is m * f behind interference signal process frequency mixer, the low pass filter
Inter-n * f
LOThe interference signal of (m, n are positive integer) drops in the channel selection filter passband just, and filter can't leach it, causes receptivity to worsen.Another kind is because the amplitude of the gain of two branch roads of down-converter unit, local oscillator is not quite identical in practice, and two local oscillators neither accurately differ 90 degree, so still have residual on a small quantity behind image frequency process frequency mixer and the low pass filter.Output frequency is n * f behind interference signal process frequency mixer, the low pass filter
LO-m * f
InterThe interference signal of (m, n are positive integer) drops in the channel model passband just, and filter can't leach it, causes receptivity to worsen.
For example, work as f
Inter=k * (f
RX+ f
IF)+Δ f
1, f
LO=f
RX+ f
IF, wherein, f
InterThe frequency of expression interference signal, f
RXThe centre frequency of expression useful signal, f
LOThe frequency of expression local oscillation signal, f
IFThe expression IF-FRE.For the ease of analyzing, suppose that channel selection filter 134 is desirable band pass filters, pass band width is BW, the signal beyond the passband is fully suppressed.
In conjunction with Fig. 2, work as m=1, n=k,
The frequency of the combination interference signal of down-converter unit 132 outputs is:
m×f
inter-n×f
LO＝k×(f
RX+f
IF)+Δf
1-k×(f
RX+f
IF)＝Δf
1 (1)
Or
-m * f
Inter+ n * f
LO=-k * (f
RX+ f
IF)-Δ f
1+ k * (f
RX+ f
IFThe Δ f of)=-
1(2) if
The frequency Δ f of the combination interference signal of above-mentioned formula (1)
1Dropped in the passband of channel selection filter.If
The frequency of the combination interference signal of above-mentioned formula (2)-Δ f
1Dropped in the passband of channel selection filter.In above-mentioned two situations, as long as interference signal is enough strong, will cause the baseband signal signal-to-noise ratio degradation, cause sensitivity to descend, error code increases sharply, even call drop.
As previously mentioned, how to suppress to drop on the combination interference signal in the channel selection filter free transmission range, the antijamming capability that improves receiver is problem demanding prompt solution of the present invention.Based on this, the inventor considers, calculates the signal to noise ratio of the described disturbed signal of each receiving slot signal after mixing and filtering processing, and judges whether to change the frequency of local oscillation signal according to described signal to noise ratio, to strengthen the inhibition to the combination interference signal, improve the antijamming capability of receiver.
Please refer to Fig. 7 and in conjunction with Fig. 1, Fig. 7 is the particular flow sheet of the disturbance restraining method that provides of the embodiment of the invention.
Particularly, at first execution in step S1 receives disturbed signal, and described disturbed signal comprises useful signal and interference signal.The centre frequency of described useful signal is f
RX, the frequency of described interference signal is f
Inter, f
Inter=k * f
RX+ Δ f, Δ f＞0.
In the present embodiment, the detailed process of execution in step S1 is as follows: during start, the frequency initial value of described local oscillation signal is set as centre frequency and IF-FRE sum, the i.e. f of useful signal
LO=f
IF+ f
RXWherein, Δ f＞0,
K＞1, and k is integer, BW represents the channel width of channel selection filter.Afterwards, receiver begins to receive disturbed signal.
Continue execution in step S2, the disturbed signal that receives and the local oscillation signal of receiver are obtained mixed frequency signal after mixing and low-pass filtering treatment.
According to the definition of aforementioned intermediate frequency, in frequency mixer, the centre frequency f of useful signal
RXFrequency f with local oscillation signal
LOMix producing a difference frequency, this difference frequency is intermediate frequency, usefulness-f
IFExpression, the definition of above-mentioned intermediate frequency can be formulated as f
LO-f
RX=f
IFTherefore, after the down-converter unit Frequency mixing processing:
f
RX'=f
RX-f
LO=f
RX-(f
RX+ f
IFThe f of)=-
If, wherein, f
RXThe centre frequency of ' expression useful signal and the combination useful signal that the local oscillation signal frequency is exported after down-converter unit;
f
IM1＝-f
RX+f
LO＝-f
RX+(f
RX+f
IF)＝f
IF，
Wherein, f
IM1Expression since fabrication error in practice two signals of down-converter unit to process the amplitude of gain, local oscillation signal of branch roads not quite identical, the frequency that causes image signal residual under nonideality output signal after the down-converter unit Frequency mixing processing, again, the free transmission range of channel selection filter is
Therefore channel selection filter can be f with frequency
IM1Target signal filter.
The frequency of the combination interference signal that the frequency of the frequency of the residual interference signal except image signal and local oscillation signal k subharmonic forms is:
f
inter-k×f
LO＝(k×f
RX+Δf)-k×(f
RX+f
IF)＝Δf-k×f
IF (3)
-f
inter+k×f
LO＝-(k×f
RX+Δf)+k×(f
RX+f
IF)＝k×f
IF-Δf (4)
Continue execution in step S3, described mixed frequency signal is carried out channel select filtering to obtain filtering signal.Particularly, with described mixed frequency signal input channel selective filter, after filtering is processed, by the output output filtering signal of channel selection filter.
The free transmission range of channel selection filter
If above-mentioned formula (3) satisfies
Then this frequency component can't be by the channel selection filter filtering.If above-mentioned formula (4) satisfies
Then this frequency component can't be by the channel selection filter filtering.
Continue execution in step S4, calculate the signal to noise ratio of described filtering signal.The signal to noise ratio of the described filtering signal of described calculating comprises carries out channel estimating with described filtering signal through after the analog-to-digital conversion, and the record signal to noise ratio.
Continue execution in step S5, receive requirement when described signal to noise ratio satisfies, continue to receive disturbed signal; Receive requirement when described signal to noise ratio does not satisfy, the follow-up continued access of frequency of the local oscillation signal of adjustment receiver is received and is disturbed signal.Described disturbed signal satisfies reception and requires to comprise that the signal to noise ratio of described filtering signal is greater than default thresholding; Described disturbed signal does not satisfy reception and requires to comprise that the signal to noise ratio of described filtering signal is less than described default thresholding.In addition, can be according to the actual requirements, the signal to noise ratio of setting described filtering signal equals default thresholding and requires or do not satisfy to receive requirement for satisfying to receive.Described default thresholding is associated with the demodulation threshold of baseband chip.Demodulation threshold refers to that the signal that receiver receives should be not less than a certain threshold value under certain error rate prerequisite, the signal that the correct demodulation of receiver ability receives.The value of described default thresholding is less than or equal to the demodulation threshold of described baseband chip usually, as when as described in demodulation threshold when being 6dB, the scope of described default thresholding can be 1dB to 6dB, for example 3dB, 4dB or 5dB.
In the present embodiment, described when the satisfied reception requirement of described signal to noise ratio, the follow-up continued access of frequency of adjusting the local oscillation signal of receiver is received and is disturbed signal and comprise: when described signal to noise ratio less than described default thresholding, if the frequency of current local oscillation signal is centre frequency and the IF-FRE sum of useful signal, then be the poor of the centre frequency of useful signal and IF-FRE with the frequency setting of local oscillation signal.
Particularly, as SNR＜T, if f
LO=f
RX+ f
IF, then the frequency of local oscillation signal is pressed following formula adjustment: f
LO'=f
RX-f
IF, wherein, SNR represents signal to noise ratio, T represents default thresholding, f
LOThe frequency of the local oscillation signal after this adjustment of ' expression.
After the frequency of local oscillation signal is adjusted, process through down-converter unit, wherein:
f
RX1＝f
RX-f
LO′＝f
RX-(f
RX-f
IF)＝f
IF，
f
RX1After representing the frequency adjustment of this local oscillation signal, the combination useful signal that the centre frequency of useful signal and the frequency of local oscillation signal are exported after down-converter unit;
f
IM2＝-f
RX+f
LO′＝-f
RX+(f
RX-f
IF)＝-f
IF，
f
IM2After representing the frequency adjustment of this local oscillation signal, since fabrication error in practice two signals of down-converter unit to process the amplitude of gain, local oscillation signal of branch roads not quite identical, the frequency that causes image signal residual under nonideality output signal after the down-converter unit Frequency mixing processing, again, the free transmission range of channel selection filter is at this moment
Therefore channel selection filter can be f with frequency
IM2Target signal filter.
The frequency that the frequency of the residual interference signal except image signal and local oscillation signal increase the combination interference signal of wave frequency composition for k time is:
f
inter-k×f
LO′＝(k×f
RX+Δf)-k×(f
RX-f
IF)＝Δf+k×f
IF (5)
-f
inter+k×f
LO′＝-(k×f
RX+Δf)+k×(f
RX-f
IF)＝-Δf-k×f
IF (6)
Investigate following formula (5), because Δ f＞0, k＞1, and be integer, so obtain:
Δf+k×f
IF＞k×f
IF≥2×f
IF (7)
Again because
Composite type (7) can get:
In conjunction with Fig. 4, this moment, the free transmission range of channel selection filter was again
Because channel selection filter can be f with frequency
IM2The residual components filtering of image signal, and remaining combination interference signal is positioned at the free transmission range of channel selection filter
Outside, suppose that channel selection filter is ideal filter, namely can be the whole filterings of signal beyond the passband.So the combination interference signal of following formula (5) can be by the channel selection filter filtering.
Investigate again following formula (6), as can be known-Δ f-k * f
IF＜0, because
So
Comprehensively can get:
Also namely this moment, remaining combination interference signal was positioned at the free transmission range of channel selection filter
Outside, so the combination interference signal of following formula (6) can be by the channel selection filter filtering.
According to above-mentioned analysis, as SNR＜T, if f
LO=f
RX+ f
IF, then the frequency of local oscillation signal is pressed f
LO'=f
RX-f
IFAdjust, can make the frequency translation of combination interference signal beyond the free transmission range of channel selection filter, the interference signal in the disturbed signal that has namely suppressed to a greater extent to receive.
In the present embodiment, when not satisfying, described signal to noise ratio do not receive requirement, the follow-up continued access of frequency of adjusting the local oscillation signal of receiver is received and is disturbed signal and also comprise: when described signal to noise ratio less than described default thresholding, if the frequency of current local oscillation signal is the poor of the centre frequency of useful signal and IF-FRE, then the frequency setting with local oscillation signal is centre frequency and the IF-FRE sum of useful signal.
Concrete analysis is if the Frequency generated of interference signal changes f
Inter=k * f
RX+ Δ f, Δ f＜0, then the frequency of formula (5), (6) may be at the channel selection filter passband
In the scope, useful signal is formed interference, cause SNR to descend.As SNR＜T, if f
LO'=f
RX-f
IF, then the frequency of local oscillation signal is pressed following formula adjustment: f
LO"=f
RX+ f
IF, wherein, SNR represents signal to noise ratio, T represents default thresholding, f
LO" the frequency that represents this local oscillation signal after adjusting.
After the local oscillation signal frequency was adjusted, disturbed signal was through the down-converter unit Frequency mixing processing, wherein:
f
RX3＝f
RX-f
LO″＝f
RX-(f
RX+f
IF)＝-f
IF，
f
RX3After representing the frequency adjustment of this local oscillation signal, the combination useful signal that the centre frequency of useful signal and local oscillation signal frequency are exported after down-converter unit;
f
IM3＝-f
RX+f
LO＝-f
RX+(f
RX+f
IF)＝f
IF，
f
IM3After representing the frequency adjustment of this local oscillation signal, since fabrication error in practice two signals of down-converter unit to process the amplitude of gain, local oscillation signal of branch roads not quite identical, the frequency that causes image signal residual under nonideality output signal after the down-converter unit Frequency mixing processing, again, the free transmission range of channel selection filter is at this moment
Channel selection filter can be f with frequency
IM3Target signal filter.
The frequency of the combination interference signal that the frequency of the frequency of the residual interference signal except image signal and local oscillation signal k subharmonic forms is:
f
inter-k×f
LO＝(k×f
RX+Δf)-k×(f
RX+f
IF)＝Δf-k×f
IF (8)
-f
inter+k×f
LO＝-(k×f
RX+Δf)+k×(f
RX+f
IF)＝k×f
IF-Δf (9)
Δ f＜0 wherein just.
Investigation formula (8), because Δ f＜0, k＞1, and be integer,
Can get:
And the free transmission range of channel selection filter is at this moment
Suppose that channel selection filter is ideal filter, namely can be the whole filterings of signal beyond the passband.
So the combination interference signal of formula (8) can be by the channel selection filter filtering.
Investigate again formula (9), as can be known k * f
IF-Δ f＞0,
Because
So
Comprehensively can get:
So the combination interference signal of formula (9) can be by the channel selection filter filtering.
It should be noted that to above-mentioned two kinds of local oscillation signal methods of adjustment in the present embodiment (frequency setting that is about to local oscillation signal is the difference of the centre frequency of useful signal and IF-FRE and is centre frequency and the IF-FRE sum of useful signal with the frequency setting of local oscillation signal) be not all will use.If after certain adjusts the frequency of local oscillation signal, after for example with the frequency setting of local oscillation signal being the difference of the centre frequency of useful signal and IF-FRE, if the disturbed signal that receives afterwards satisfies the reception requirement through the signal to noise ratio of the filtering signal of mixing and filtering gained always, then needn't adjust the frequency of local oscillation signal, namely not needing the frequency setting with local oscillation signal is centre frequency and the IF-FRE sum of useful signal again again.
Interference signal described in the embodiment of the present invention can be from any noise source that well known to a person skilled in the art, such as thermal noise, element noise or ambient noise etc.In the present embodiment, near situation about specifically appearing at the integral multiple of useful signal frequency with the frequency of interference signal describes, need to prove, the described disturbance restraining method of embodiment of the present invention is not confined to the frequency of interference signal in applicable the present embodiment, for all possible interference signal frequency, disturbance restraining methods in the applicable embodiment of the present invention all.
Please refer to Fig. 8, Fig. 8 is the structural representation of the interference suppression equipment that provides of the embodiment of the invention.Technical solution of the present invention also provides a kind of interference suppression equipment, comprising:
Signal receiving unit 1 is used for receiving disturbed signal, and described disturbed signal comprises useful signal and interference signal.
Down-converter unit 3 is used for the superpose mixed frequency signal of acquisition of disturbed signal that described signal receiving unit 1 is received and local oscillation signal after mixing and low-pass filtering treatment.
Filter unit 4 is used for the mixed frequency signal of described down-converter unit 3 outputs is carried out channel selection filtering acquisition filtering signal.
Computing unit 5 is for the signal to noise ratio of calculating described filtering signal.
Control unit 6 is used for satisfying the reception requirement when the signal to noise ratio that described computing unit 5 obtains, and controls described signal receiving unit 1 and continues to receive disturbed signal; The signal to noise ratio that obtains when described control unit 5 does not satisfy the reception requirement, and the described signal receiving unit 1 of control continues to receive disturbed signal after the frequency of adjustment local oscillation signal.
The initial value of described local oscillation signal is set as centre frequency and the IF-FRE sum of useful signal.
The described signal to noise ratio that described computing unit 5 obtains satisfies reception and requires to comprise that the signal to noise ratio of described filtering signal is greater than default thresholding; The described signal to noise ratio that described computing unit 5 obtains does not satisfy reception and requires to comprise that the signal to noise ratio of described filtering signal is less than described default thresholding.Described default thresholding is associated with the demodulation threshold of baseband chip.Demodulation threshold refers to that the signal that receiver receives should be not less than a certain threshold value under certain error rate prerequisite, the signal that the correct demodulation of receiver ability receives.The value of described default thresholding is usually less than the demodulation threshold of described baseband chip, as when as described in demodulation threshold when being 6dB, the scope of described default thresholding can be 1dB to 6dB, such as 3dB, 4dB or 5dB.
Described computing unit 5 comprises:
AD conversion unit, being used for described filtering signal is digital signal by analog signal conversion.
Digital signal processing unit is used for the filtering signal after described AD conversion unit conversion is carried out channel estimating, and records the signal to noise ratio of described filtering signal.
In the present embodiment, described digital signal processing unit can comprise:
The channel estimating unit (not shown) is used for determining channel model based on estimating the channel model parameter through the filtering signal of described AD conversion unit conversion.
Snr computation unit (not shown) is for the signal to noise ratio of calculating described filtering signal based on described channel model.
Described control unit 6 comprises:
The first adjustment unit, be used for when described signal to noise ratio less than described default thresholding, and if the frequency of current local oscillation signal be centre frequency and the IF-FRE sum of useful signal, be the poor of the centre frequency of useful signal and IF-FRE with the frequency setting of local oscillation signal.
In the present embodiment, described control unit 6 also comprises:
The second adjustment unit, be used for when described signal to noise ratio less than described default thresholding, and if the frequency of current local oscillation signal be the poor of the centre frequency of useful signal and IF-FRE, be centre frequency and the IF-FRE sum of useful signal with the frequency setting of local oscillation signal.
Described signal receiving unit can comprise: antenna, band pass filter and low noise amplifier.
Described interference suppression equipment can also comprise the first variable gain amplifier (not shown), is used for before filter unit 4 receives mixed frequency signal described mixed frequency signal being made gain process.Described the first variable gain amplifier can be integrated in down-converter unit or the filter unit.
Described interference suppression equipment can also comprise the second variable gain amplifier (not shown), is used for before computing unit 5 obtains filtering signal described filtering signal being made gain process.Described the first variable gain amplifier can be integrated in filter unit or the computing unit.
Please refer to Fig. 9, technical solution of the present invention also provides a kind of receiver 200, comprises the described interference suppression equipment of above-described embodiment.Receiver 200 also comprises local oscillator generating unit 2, and described local oscillator generating unit 2 is connected in described down-converter unit 3 and described control unit 6.Receiver 200 receives disturbed signal by the signal receiving unit 1 in the interference suppression equipment.Disturbed signal and local oscillation signal be the output filtering signal after down-converter unit 3 and filter unit 4 processing.If computing unit 5 calculates the signal to noise ratio of filtering signal less than default thresholding, then interference suppression equipment is adjusted the frequency of the local oscillation signal of local oscillator generating unit 2 generations by its control unit 6, continues to receive disturbed signal.This moment, local oscillator generating unit 2 changed to the local oscillation signal of down-converter unit 3 outputs, so that drop on outside the channel selection filter free transmission range of filter unit 4 through the frequency of the combination interference signal of down-converter unit output, thereby by filtering.
With respect to existing receiver, the receiver of technical solution of the present invention can calculate signal to noise ratio based on the disturbed signal that receives, to regulate adaptively the frequency of local oscillation signal, to drop on the frequency translation of the combination interference signal in the channel selection filter passband outside this passband, also overcome in addition receiver because the fabrication error of complex mixing system and the complete shortcoming of filtering image signal interference, effectively improved the antijamming capability of low intermediate frequency receiver.
In sum, disturbance restraining method, device and the receiver that the embodiment of the invention proposes is based on the characteristic of channel selection filter Inhibitory signal, signal to noise ratio by continuous detection signal to be demodulated, judge whether to change the frequency of local oscillation signal, and by the algorithm of adjusting the local oscillation signal frequency described in the technical solution of the present invention local oscillation signal is adjusted, frequency through the combination interference signal of down-converter unit is dropped on outside the free transmission range of channel selection filter, thus suppressed.Also overcome in addition receiver because the fabrication error of complex mixing system and the complete shortcoming of filtering image signal interference.With respect to the low intermediate frequency receiver of existing employing fixed frequency local oscillator, technical solution of the present invention has increased the inhibition to interference signal, has improved the antijamming capability of receiver.
Although the present invention with preferred embodiment openly as above; but it is not to limit the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made possible change and modification; therefore; every content that does not break away from technical solution of the present invention; to any simple modification, equivalent variations and modification that above embodiment does, all belong to the protection range of technical solution of the present invention according to technical spirit of the present invention.
Claims (16)
1. a disturbance restraining method is characterized in that, comprising:
Receive disturbed signal, described disturbed signal comprises useful signal and interference signal;
The disturbed signal that receives and the local oscillation signal of receiver are obtained mixed frequency signal after mixing and low-pass filtering treatment;
Described mixed frequency signal is carried out channel selects filtering to obtain filtering signal;
Calculate the signal to noise ratio of described filtering signal;
Receive requirement when described signal to noise ratio satisfies, continue to receive disturbed signal; Receive requirement when described signal to noise ratio does not satisfy, the follow-up continued access of frequency of the local oscillation signal of adjustment receiver is received and is disturbed signal.
2. disturbance restraining method according to claim 1 is characterized in that, the frequency initial value of described local oscillation signal is set as centre frequency and the IF-FRE sum of useful signal.
3. disturbance restraining method according to claim 1 is characterized in that, described disturbed signal satisfies reception and requires to comprise that the signal to noise ratio of described filtering signal is greater than default thresholding; Described disturbed signal does not satisfy reception and requires to comprise that the signal to noise ratio of described filtering signal is less than described default thresholding.
4. disturbance restraining method according to claim 3 is characterized in that, described default thresholding is less than or equal to the demodulation threshold of baseband chip.
5. disturbance restraining method according to claim 3, it is characterized in that, described when the satisfied reception requirement of described signal to noise ratio, the follow-up continued access of frequency of adjusting the local oscillation signal of receiver is received and is disturbed signal and comprise: when described signal to noise ratio less than described default thresholding, if the frequency of current local oscillation signal is centre frequency and the IF-FRE sum of useful signal, then be the poor of the centre frequency of useful signal and IF-FRE with the frequency setting of local oscillation signal.
6. disturbance restraining method according to claim 5, it is characterized in that, described when the satisfied reception requirement of described signal to noise ratio, the follow-up continued access of frequency of adjusting the local oscillation signal of receiver is received and is disturbed signal and also comprise: when described signal to noise ratio less than described default thresholding, if the frequency of current local oscillation signal is the poor of the centre frequency of useful signal and IF-FRE, then the frequency setting with local oscillation signal is centre frequency and the IF-FRE sum of useful signal.
7. disturbance restraining method according to claim 1 is characterized in that, the signal to noise ratio of the described filtering signal of described calculating comprises carries out channel estimating with described filtering signal through after the analog-to-digital conversion, and the record signal to noise ratio.
8. an interference suppression equipment is characterized in that, comprising:
Signal receiving unit is used for receiving disturbed signal, and described disturbed signal comprises useful signal and interference signal;
Down-converter unit, the disturbed signal and the local oscillation signal that are used for described signal receiving unit is received obtain mixed frequency signal after mixing and low-pass filtering treatment;
Filter unit is used for the mixed frequency signal of described down-converter unit output is carried out channel selection filtering acquisition filtering signal;
Computing unit is for the signal to noise ratio of calculating described filtering signal;
Control unit, the signal to noise ratio that is used for obtaining when described computing unit satisfies the reception requirement, controls described signal receiving unit and continues to receive disturbed signal; The signal to noise ratio that obtains when described computing unit does not satisfy the reception requirement, and the described signal receiving unit of control continues to receive disturbed signal after the frequency of adjustment local oscillation signal.
9. interference suppression equipment according to claim 8 is characterized in that, the initial value of the frequency of described local oscillation signal is set as centre frequency and the IF-FRE sum of useful signal.
10. interference suppression equipment according to claim 8 is characterized in that, the described signal to noise ratio that described computing unit obtains satisfies reception and requires to comprise that the signal to noise ratio of described filtering signal is greater than default thresholding; The described signal to noise ratio that described computing unit obtains does not satisfy reception and requires to comprise that the signal to noise ratio of described filtering signal is less than described default thresholding.
11. interference suppression equipment according to claim 10 is characterized in that, described default thresholding is less than or equal to the demodulation threshold of baseband chip.
12. interference suppression equipment according to claim 8 is characterized in that, described control unit comprises:
The first adjustment unit, be used for when described signal to noise ratio less than described default thresholding, and if the frequency of current local oscillation signal be centre frequency and the IF-FRE sum of useful signal, be the poor of the centre frequency of useful signal and IF-FRE with the frequency setting of local oscillation signal.
13. interference suppression equipment according to claim 12 is characterized in that, described control unit also comprises:
The second adjustment unit, be used for when described signal to noise ratio less than described default thresholding, and if the frequency of current local oscillation signal be the poor of the centre frequency of useful signal and IF-FRE, be centre frequency and the IF-FRE sum of useful signal with the frequency setting of local oscillation signal.
14. interference suppression equipment according to claim 8 is characterized in that, described computing unit comprises:
AD conversion unit, being used for described filtering signal is digital signal by analog signal conversion;
Digital signal processing unit is used for the filtering signal after described AD conversion unit conversion is carried out channel estimating, and records the signal to noise ratio of described filtering signal.
15. a receiver is characterized in that, comprises each described interference suppression equipment in the claim 9 to 14.
16. receiver according to claim 15 is characterized in that, also comprises the local oscillator generating unit, described local oscillator generating unit is connected in described down-converter unit and described control unit.
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Effective date of registration: 20200529 Address after: 361012 unit 05, 8 / F, building D, Xiamen international shipping center, No.97 Xiangyu Road, Xiamen area, China (Fujian) free trade zone, Xiamen City, Fujian Province Patentee after: Xinxin Finance Leasing (Xiamen) Co.,Ltd. Address before: 201203 Zuchongzhi Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai 2288 Patentee before: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. |
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Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xin Xin finance leasing (Beijing) Co.,Ltd. Contract record no.: 2018990000163 Date of cancellation: 20210301 |
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Application publication date: 20131023 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xinxin Finance Leasing (Xiamen) Co.,Ltd. Contract record no.: X2021110000010 Denomination of invention: Interference suppression method, device and receiver Granted publication date: 20150520 License type: Exclusive License Record date: 20210317 |
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