CN101998459B - Method and device for measuring single-tone field strength - Google Patents
Method and device for measuring single-tone field strength Download PDFInfo
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- CN101998459B CN101998459B CN2009101712695A CN200910171269A CN101998459B CN 101998459 B CN101998459 B CN 101998459B CN 2009101712695 A CN2009101712695 A CN 2009101712695A CN 200910171269 A CN200910171269 A CN 200910171269A CN 101998459 B CN101998459 B CN 101998459B
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Abstract
The invention provides a method for measuring single-tone field strength. The method comprises the following steps of: converting radio frequency single-tone signals into channel I and channel Q analog baseband signals; converting the channel I and channel Q analog baseband signals into channel I and channel Q digital baseband signals; performing secondary down-conversion on the channel I and channel Q digital baseband signals to acquire single-tone baseband signals, wherein image frequency interfering suppression is performed on a numeric field in the process of the secondary down-conversion; performing fast fourier transform spectral peak searching on the single-tone baseband signals; and performing power spectrum integral on a spectral peak to acquire the field strength of the radio frequency single-tone signals. The invention also provides a device for measuring the single-tone field strength. The method and the device have the advantages of low power consumption, small volume and low cost.
Description
Technical field
The present invention relates to a kind of wireless communication system, relate in particular to a kind of measuring single-tone field strength method and apparatus.
Background technology
In wireless network is planned in earlier stage, often adopt vehicle-mounted tone transmitter analogue mobile phone to launch, receive with measuring single-tone field strength receiver anolog base station, to obtain the path loss of each wireless channel.The measuring single-tone field strength receiver generally is used in the wireless network planning process, carries out path loss and measures.According to actual conditions, the measuring single-tone field strength receiver must possess following characteristic:
1. because in the planning in early stage, the position of base station need to be estimated, the website that simulation is arranged net often lacks the complete receiver installation environment of facility, so require measuring single-tone field strength receiver volume little, is easy to carry, mounts and dismounts.
2. single-tone field strength receiver installation environment need to be estimated, and can't use AC-powered, needs powered battery, and after once simulation is arranged net, need repeatedly observation, the measuring single-tone field strength receiver can't frequently be pulled down charging in the observation process, need long-time standby, this requires low-power consumption.
3. require the sensitivity higher than the base station.
Existing measuring single-tone field strength receiver generally adopts superhet secondary down-conversion mode.Figure 1 shows that the realization block diagram of existing superhet secondary down-conversion measuring single-tone field strength receiver, signal enters low noise amplifier through antenna, after image-reject filter filtering, carry out the down-conversion first time, amplify through intermediate frequency again, entering high-speed ADC (analog-digital converter) samples, analog if signal is converted to digital medium-frequency signal, by digital processing chip (on-site programmable gate array FPGA or Digital Signal Processing DSP) digital medium-frequency signal is carried out the down-conversion second time again, carry out FFT (fast fourier transform) and power spectrum integration after becoming digital baseband signal, draw the single-tone field intensity.In this scheme, must bring for the first time mirror image to disturb in the downconversion process, disturb for suppressing mirror image, need to add the logical image-reject filter of band before carrying out the down-conversion first time signal is carried out filtering, work better for making image-reject filter, the frequency after the down-conversion can not be excessively low for the first time), generally be at least more than tens megahertzes, otherwise will cause the image-reject filter bandwidth narrow, the Q value is too high, is difficult for realizing.
What above-mentioned measuring single-tone field strength receiver was continued to use is the scheme of modulated signal receiver, and following shortcoming is arranged:
1. the circuit volume is large, and is not easy of integration.Must add the logical image-reject filter of band in this receiver, cause circuit complicated, and this filter changes with the working signal frequency change, do not have versatility, not easy of integration; In addition, higher IF-FRE requires height to ADC and the digital processing chip (FPGA or DSP) of rear class, requires the ADC sampling resolution large, and sample rate is high, require digital processing chip that faster processing speed is arranged, thereby bring the large volume of ADC and digital processing chip.
2. power consumption is large.The sample rate that ADC and digital processing chip are too high and disposal ability must be brought the large power consumption of device.
3. cost is high.High performance ADC and digital processing chip must bring expensive.
In sum, available technology adopting superhet secondary down-conversion receiver carries out measuring single-tone field strength, although sensitivity is higher, volume is large, and power consumption is large, is difficult to satisfy the actual demand that wireless network is planned in earlier stage.Be high efficiency, low cost is carried out wireless network planning, need design high sensitivity, small size, low-power consumption, cheaply the measuring single-tone field strength receiver.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of measuring single-tone field strength method and apparatus, has highly sensitively, and volume is little, advantage low in energy consumption.
In order to address the above problem, the invention provides a kind of measuring single-tone field strength method, comprising:
A down-conversion step is converted to I road and Q road analog baseband signal with the radio frequency tone signal;
The analog-to-digital conversion step is converted to I road and Q railway digital baseband signal with described I road and Q road analog baseband signal;
Secondary down-conversion step is carried out the secondary down-conversion to described I road and Q railway digital baseband signal, obtains the single-tone baseband signal, wherein, in the secondary downconversion process, also carries out image interference at numeric field and suppresses;
The field intensity calculation procedure is carried out the fast fourier transform spectrum peak search to described single-tone baseband signal, and the place, peak carries out the power spectrum integration in spectrum, obtains radio frequency tone signal field intensity.
Further, said method also can have following characteristics, in the described down-conversion step, described radio frequency tone signal is converted to ultra-low frequency I road and Q road analog baseband signal, and described ultralow frequency refers to be in the frequency between 10kHz～1000KHz.
Further, said method also can have following characteristics, described analog-to-digital conversion step specifically comprises: low-pass filtering is carried out on described I road and Q road analog baseband signal, carry out after variable gain amplifies, using samples to I road and Q road analog baseband signal greater than the sampling rate of 2MHZ obtains I road and Q railway digital baseband signal again.
Further, said method also can have following characteristics, in the described secondary down-conversion step, uses a quadrature pilotaxitic texture to carry out secondary down-conversion and image interference inhibition.
Further, said method also can have following characteristics, and in the described secondary down-conversion step, the described single-tone baseband signal that described I road and Q railway digital baseband signal are carried out obtaining after the secondary down-conversion is zero-frequency single-tone baseband signal.
The present invention also provides a kind of measuring single-tone field strength device, comprising:
A down conversion module is used for the radio frequency tone signal is converted to I road and Q road analog baseband signal;
Analog-to-digital conversion module is used for described I road and Q road analog baseband signal are converted to I road and Q railway digital baseband signal;
The secondary down conversion module is used for the secondary down-conversion is carried out on described I road and Q railway digital baseband signal, obtains the single-tone baseband signal, wherein, in the secondary downconversion process, also carries out image interference at numeric field and suppresses;
The field intensity computing module is used for described single-tone baseband signal is carried out the fast fourier transform spectrum peak search, and the place, peak carries out the power spectrum integration in spectrum, obtains radio frequency tone signal field intensity.
Further, said apparatus also can have following characteristics, and a described down conversion module is used for described radio frequency tone signal is converted to ultra-low frequency I road and Q road analog baseband signal, and described ultralow frequency refers to be in the frequency between 10kHz～1000KHz.
Further, said apparatus also can have following characteristics, and described analog-to-digital conversion module further comprises low pass filter, variable gain amplifier and analog to digital converter, wherein:
Described low pass filter is used for low-pass filtering is carried out on described I road and Q road analog baseband signal;
Described variable gain amplifier is used for the variable gain amplification is carried out on the I road after the described low-pass filtering and Q road analog baseband signal;
Described analog to digital converter is used for using to sample greater than the sampling rate of 2MHZ and obtaining I road and Q railway digital baseband signal carrying out I road after variable gain is amplified and Q road analog baseband signal.
Further, said apparatus also can have following characteristics, and described secondary down conversion module is a quadrature pilotaxitic texture.
Further, said apparatus also can have following characteristics, described secondary down conversion module, and the described single-tone baseband signal that described I road and Q railway digital baseband signal are carried out obtaining after the secondary down-conversion is zero-frequency single-tone baseband signal.
The present invention can reach the sensitivity equal with prior art, yet because the difference on the realization principle, the present invention is compared with existing technology, and has the following advantages:
1. reduced volume.The present invention need not the image frequency rejects trap in the first time before the down-conversion, simplified circuit; And for the first time frequency conversion changes to ultralow frequency (100KHz), has reduced the sample rate of ADC and the requirement of sampling resolution, ADC and IQ modulator etc. can be integrated in the chip, has reduced volume.In addition, ultra-low frequency digital baseband signal has also reduced the disposal ability requirement of digital processing chip behind the ADC, and this has also reduced the volume of digital processing unit.
2. reduced power consumption.The present invention requires to have reduced to ADC sample rate and sampling resolution, and this must reduce the power consumption of ADC.And the reduction of data signal rate has also reduced the requirement to the rear class digital processing unit simultaneously, when reducing volume, has also reduced power consumption.
3. reduced cost.The reduction that ADC sample rate and sampling resolution are required, the reduction that rear class digital processing chip disposal ability is required, the reduction that must bring cost.
Description of drawings
Fig. 1 is existing superhet double conversion receiver block diagram;
Fig. 2 is measuring single-tone field strength method of measurement flow chart of the present invention;
Fig. 3 is measuring single-tone field strength receiver block diagram of the present invention;
Fig. 4 is the present invention's one application example measuring single-tone field strength receiver block diagram;
Fig. 5 is the quadrature Weaver structured flowchart that uses among the present invention.
Embodiment
Core concept of the present invention is: at first the radio frequency tone signal is converted to ultralow frequency I road and Q road (being mutually orthogonal two-way) analog baseband signal, then ultralow frequency I road and Q road analog baseband signal are converted to I road and Q railway digital baseband signal, again the secondary down-conversion is carried out on I road and Q railway digital baseband signal, obtain the zero-frequency baseband signal, in the downconversion process, carry out mirror image at numeric field and suppress, the zero-frequency baseband signal is processed obtaining radio frequency tone signal field intensity.
As shown in Figure 2, the measuring single-tone field strength method of the present invention's proposition comprises:
Step 210: a down-conversion step is converted to ultralow frequency I road and Q road analog baseband signal with the radio frequency tone signal; Described ultralow frequency refers to be in the frequency of 10kHz～1000KHz frequency range;
The radio frequency tone signal enters the single-tone baseband signal that the IQ modulator is down-converted to ultralow frequency (such as being 100KHz) after low noise amplifier amplifies, obtain I road and Q road analog baseband signal.
Step 220: the analog-to-digital conversion step is converted to respectively I road and Q railway digital baseband signal with I road and Q road analog baseband signal;
Specifically comprise: low-pass filtering is carried out on I road and Q road analog baseband signal, and sampling obtains I road and Q railway digital baseband signal again.Wherein, I road and Q road analog baseband signal carried out low-pass filtering after, can carry out variable gain and amplify according to the situation of input signal power, and then enter ADC and sample.
During sampling, sampling rate generally gets final product greater than 2MHz.
Step 230: secondary down-conversion step, the secondary down-conversion is carried out on I road and Q railway digital baseband signal, obtain the single-tone baseband signal, wherein, in the secondary downconversion process, also carry out image interference at numeric field and suppress.
Wherein, its frequency of single-tone baseband signal that the secondary down-conversion obtains can be zero-frequency, also can be other frequencies that are not more than 1KHz.
Wherein, use quadrature Weaver (an interweaving) structure to realize the secondary down-conversion.
Because signal has been divided into the IQ two-way during down-conversion in the first time, therefore in the secondary downconversion process, can adopt quadrature Weaver (interweaving) structure to eliminate image interference at numeric field.Also can adopt other structures to carry out the image interference filtering, the present invention is not construed as limiting this.
Because be the single-tone digital baseband signal, so the process of secondary down-conversion, the DC component (DC OFFSET) that local-oscillator leakage and radiofrequency signal self-mixing cause rejected.
Step 240 is carried out the FFT spectrum peak search to the single-tone baseband signal, search the spectrum peak after, the place, peak carries out the power spectrum integration in spectrum, obtains radio frequency tone signal field intensity value.
Shown in Figure 3 is measuring single-tone field strength device block diagram of the present invention, comprising: down conversion module, analog-to-digital conversion module, secondary down conversion module and a field intensity computing module, wherein:
A described down conversion module is used for the radio frequency tone signal is converted to ultralow frequency I road and Q road analog baseband signal, exports analog-to-digital conversion module to; Described ultralow frequency refers to be in the frequency between 10kHz～1000KHz;
Described analog-to-digital conversion module is used for I road and Q road analog baseband signal are converted to I road and Q railway digital baseband signal, exports the secondary down conversion module to;
Described secondary down conversion module is used for the secondary down-conversion is carried out on described I road and Q railway digital baseband signal, obtains the single-tone baseband signal, wherein, in the secondary downconversion process, also carries out image interference at numeric field and suppresses;
Described field intensity computing module is used for described single-tone baseband signal is processed, and obtains the field intensity of radio frequency tone signal, specifically refer to, described single-tone baseband signal is carried out the fast fourier transform spectrum peak search, and the place, peak carries out the power spectrum integration in spectrum, obtains radio frequency tone signal field intensity.
Further, a described down conversion module comprises low noise amplifier and IQ modulator.
Further, described analog-to-digital conversion module comprises low pass filter, variable gain amplifier and analog to digital converter, wherein:
Described low pass filter is used for low-pass filtering is carried out on described I road and Q road analog baseband signal;
Described variable gain amplifier is used for the variable gain amplification is carried out on the I road after the low-pass filtering and Q road analog baseband signal;
Described analog to digital converter is used for I road and the use of Q road analog baseband signal carried out after variable gain is amplified are sampled greater than the sampling rate of 2MHz, obtains I road and Q railway digital baseband signal.
Further, described secondary down conversion module is a quadrature Weaver structure.Described quadrature Weaver structure comprises the first frequency mixer, the second frequency mixer, the first low pass filter, the second low pass filter, three-mixer and the 4th frequency mixer, wherein, the first frequency mixer, the first low pass filter, three-mixer link to each other successively, the second frequency mixer, the second low pass filter, the 4th frequency mixer link to each other successively, the first frequency mixer and the second frequency mixer quadrature, three-mixer and the 4th frequency mixer quadrature, the local oscillation signal frequencies omega of the first frequency mixer and the second frequency mixer
LO1Local oscillation signal frequencies omega with three-mixer and the 4th frequency mixer
LO2Difference be I road and Q railway digital base-band signal frequency.
Further, described secondary down conversion module described single-tone baseband signal that described I road and Q railway digital baseband signal are carried out obtaining after the secondary down-conversion is zero-frequency single-tone baseband signal.
Further, be to adapt to multi-rate digital signal processing, described secondary down conversion module also comprises a data reduction of speed withdrawal device, is used for that I road and Q railway digital baseband signal are carried out N and doubly extracts, and N is positive integer.
Described data reduction of speed withdrawal device can use FPGA to realize.Described secondary down conversion module (except data reduction of speed withdrawal device) and field intensity computing module use DSP to realize.
Figure 4 shows that the present invention's one measuring single-tone field strength application of installation example.This measuring single-tone field strength device comprises IQ modulator, low pass filter, variable gain amplifier, ADC (analog to digital converter) and data reduction of speed withdrawal device (being realized by FPGA), secondary down conversion module and field intensity computing module, wherein:
The radio frequency tone signal is entered by antenna opening, after LNA is amplified, is converted to differential signal, enters the ultra-low frequency single-tone baseband signal that the IQ modulator down-converts to 100kHz.
The single-tone baseband signal is divided into the IQ two-way, is undertaken entering variable gain amplifier after the low-pass filtering by low pass filter and amplifies, and multiplication factor determines by input signal is strong and weak.Signal after the amplification enters two-way ADC and carries out baseband sampling.The pass band width of low pass filter is 720KHz, and this bandwidth ratio base-band signal frequency 100KHz is high, and reason is under different applied environments, freely to choose base-band signal frequency in the 720KHz scope, to reach optimum state.
The sampling rate of ADC is 6.5MSPS, and with respect to low pass filter before the sampling of 720KHz, the sampling rate of 6.5MSPS satisfies Nquist sampling criterion far away, and 6 times of over-sampling effects are arranged, and can effectively reduce signal noise.
Above-mentioned these these radio-frequency enabled can realize that simple in structure, low in energy consumption, volume is little with an integrated chip and minority peripheral components, and cost is low.
Signal is behind ADC, become digital baseband signal, for being complementary with the employed DSP processing speed of this device rear class, digital baseband signal is introduced into FPGA and carries out 4 times of extractions (perhaps 8 times of extractions, can decide as required), data rate is reduced to 1.625MSPS by 6.5MSPSz, and the baseband signal after the extraction enters DSP and carries out the secondary down-conversion and utilize Weaver (interweaving) STRUCTURE DEPRESSION mirror image to disturb.
Quadrature Weaver structure adopts two multipliers that mixing is used, fairly simple in the realization, concrete structure as shown in Figure 5, comprise the first frequency mixer, the second frequency mixer, the first low pass filter, the second low pass filter, three-mixer and the 4th frequency mixer, wherein, the first frequency mixer, the first low pass filter, three-mixer link to each other successively, the second frequency mixer, the second low pass filter, the 4th frequency mixer link to each other successively, the first frequency mixer and the second frequency mixer quadrature, three-mixer and the 4th frequency mixer quadrature.
In the present invention, get high local oscillator, namely local oscillator is higher than radiofrequency signal, and makes w
LO1-w
LO2=w
RF, wherein, ω
LO1The local oscillator of the first frequency mixer and the second frequency mixer, ω
LO2It is the local oscillator of three-mixer and the 4th frequency mixer; Namely in the Weaver structure, get the local oscillator w of for the second time mixing
LO2=w
LO1-w
RF=w
IF, then be output as zero intermediate frequency, and image frequency carried out establishment.The direct current offset (DC Offset) of simultaneously IQ modulator generation is moved ω after the mixing first time of Weaver structure
LO1, by the low pass filter filters out of back.
The process of inhibition of image signal is as follows: establishing radio-frequency input signals is v
RF(t)=V
RFCos (ω
RF+ w
0) t, the mirror image interference signal is v
Im(t)=V
ImCos (ω
RF+ 2w
IF+ w
Im) t.ω is got in for the first time mixing
LO1=ω
RF+ ω
IF, down-conversion is got w for the second time
LO2=w
IFThe local oscillation signal cos ω of input signal and two quadratures
LO1T and sin ω
LO1T multiplies each other (being mixing) and by behind the low pass filter, filtering and frequency component, the then v at A point place among the figure
A(t) and the v at B point place
B(t) be respectively:
Again after second time down-conversion
Addition is output as
Behind rear class low pass filter filters out and the frequency component, then only remaining radiofrequency signal changes to frequency content after the base band, and the image frequency that produces during down-conversion for the first time is suppressed.
At last, zero-frequency single-tone baseband signal is carried out the FFT spectrum peak search, because the local oscillation signal frequency of receiver not necessarily strict frequency accurate, simultaneously radio-frequency input signals is also not necessarily accurately strict, therefore tone signal strict zero-frequency not necessarily after the secondary down-conversion, but certain error is arranged, therefore must carry out the FFT spectrum peak search, rather than carry out power calculation at the zero-frequency point simply.The bandwidth that this device FFT carries out spectrum peak search is 18KHz.After searching the spectrum peak, the place, peak carries out the power spectrum integration in spectrum, and the integration bandwidth is 1kHz, thereby obtains tone signal field intensity value.In addition, the bandwidth setting of spectrum peak search is much smaller than ω
LO1, not within the spectrum peak search scope, even the low pass filter in the Weaver structure is to being mixed to ω
LO1It is not enough that the direct current offset DC offset at place suppresses, and also do not affect the sensitivity of this device, also reduced the requirement to filter.
The method of the invention and device compared with prior art, have following difference:
1, for the first time difference of down-conversion.In first time of the present invention downconversion process, be divided into the IQ two-way, down-conversion converts directly to ultralow frequency (100KHz), and prior art the first time down-conversion regardless of the IQ two-way, transform to a higher frequency (at least tens megahertzes).
2. image interference suppresses the difference of means.The present invention's signal in first time downconversion process has divided the two-way for IQ, and what export after the ADC conversion is IQ two-way digital baseband signal, can remove image interference at numeric field like this, need not the first time down-conversion the front use the image frequency rejects trap.
The present invention can reach the sensitivity equal with prior art, yet because the difference on the realization principle, the present invention is compared with existing technology, and has the following advantages:
1. reduced volume.The present invention need not the image frequency rejects trap in the first time before the down-conversion, simplified circuit; And for the first time frequency conversion changes to ultralow frequency (100KHz), has reduced the sample rate of ADC and the requirement of sampling resolution, ADC and IQ modulator etc. can be integrated in the chip, has reduced volume.In addition, ultra-low frequency digital baseband signal has also reduced the disposal ability requirement of digital processing chip behind the ADC, has also reduced the volume of digital processing unit.
2. reduced power consumption.The present invention requires to reduce to ADC sample rate and sampling resolution, and this must reduce the power consumption of ADC.And the reduction of data signal rate has also reduced the requirement of rear class digital processing unit simultaneously, when reducing volume, has also reduced power consumption.
3. reduced cost.To the reduction of ADC sample rate and sampling resolution requirement, to the reduction of rear class digital processing chip disposal ability requirement, thus the reduction that brings cost.
Claims (8)
1. a measuring single-tone field strength method is characterized in that, comprising:
A down-conversion step is converted to ultra-low frequency I road and Q road analog baseband signal with the radio frequency tone signal, and described ultralow frequency refers to be in the frequency between 10kHz～1000KHz;
The analog-to-digital conversion step is converted to I road and Q railway digital baseband signal with described I road and Q road analog baseband signal;
Secondary down-conversion step is carried out the secondary down-conversion to described I road and Q railway digital baseband signal, obtains the single-tone baseband signal, wherein, in the secondary downconversion process, also carries out image interference at numeric field and suppresses;
The field intensity calculation procedure is carried out the fast fourier transform spectrum peak search to described single-tone baseband signal, and the place, peak carries out the power spectrum integration in spectrum, obtains radio frequency tone signal field intensity.
2. the method for claim 1, it is characterized in that, described analog-to-digital conversion step specifically comprises: low-pass filtering is carried out on described I road and Q road analog baseband signal, carry out after variable gain amplifies, using samples to I road and Q road analog baseband signal greater than the sampling rate of 2MHZ obtains I road and Q railway digital baseband signal again.
3. the method for claim 1 is characterized in that, in the described secondary down-conversion step, uses a quadrature pilotaxitic texture to carry out secondary down-conversion and image interference inhibition.
4. the method for claim 1 is characterized in that, in the described secondary down-conversion step, the described single-tone baseband signal that described I road and Q railway digital baseband signal are carried out obtaining after the secondary down-conversion is zero-frequency single-tone baseband signal.
5. a measuring single-tone field strength device is characterized in that, comprising:
A down conversion module is used for the radio frequency tone signal is converted to ultra-low frequency I road and Q road analog baseband signal, and described ultralow frequency refers to be in the frequency between 10kHz～1000KHz;
Analog-to-digital conversion module is used for described I road and Q road analog baseband signal are converted to I road and Q railway digital baseband signal;
The secondary down conversion module is used for the secondary down-conversion is carried out on described I road and Q railway digital baseband signal, obtains the single-tone baseband signal, wherein, in the secondary downconversion process, also carries out image interference at numeric field and suppresses;
The field intensity computing module is used for described single-tone baseband signal is carried out the fast fourier transform spectrum peak search, and the place, peak carries out the power spectrum integration in spectrum, obtains radio frequency tone signal field intensity.
6. device as claimed in claim 5 is characterized in that, described analog-to-digital conversion module further comprises low pass filter, variable gain amplifier and analog to digital converter, wherein:
Described low pass filter is used for low-pass filtering is carried out on described I road and Q road analog baseband signal;
Described variable gain amplifier is used for the variable gain amplification is carried out on the I road after the described low-pass filtering and Q road analog baseband signal;
Described analog to digital converter is used for using to sample greater than the sampling rate of 2MHZ and obtaining I road and Q railway digital baseband signal carrying out I road after variable gain is amplified and Q road analog baseband signal.
7. device as claimed in claim 5 is characterized in that, described secondary down conversion module is a quadrature pilotaxitic texture.
8. device as claimed in claim 5 is characterized in that, described secondary down conversion module, and the described single-tone baseband signal that described I road and Q railway digital baseband signal are carried out obtaining after the secondary down-conversion is zero-frequency single-tone baseband signal.
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| CN103647563B (en) * | 2013-10-28 | 2015-08-12 | 中国科学院国家授时中心 | Anti-Image interference receiver |
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| WO2002095962A2 (en) * | 2001-05-25 | 2002-11-28 | Koninklijke Philips Electronics N.V. | Quadrature envelope-sampling of intermediate frequency signal in receiver |
| CN1708967A (en) * | 2002-10-25 | 2005-12-14 | Gct半导体公司 | Radio receiver and method for AM suppression and dc-offset removal |
| CN101031126A (en) * | 2007-02-05 | 2007-09-05 | 京信通信技术(广州)有限公司 | Path-measuring receiver and method for processing base-band signal |
| CN101075814A (en) * | 2007-05-10 | 2007-11-21 | 京信通信系统（中国）有限公司 | Digital receiver system based on special digital medium-frequency structure |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002095962A2 (en) * | 2001-05-25 | 2002-11-28 | Koninklijke Philips Electronics N.V. | Quadrature envelope-sampling of intermediate frequency signal in receiver |
| CN1708967A (en) * | 2002-10-25 | 2005-12-14 | Gct半导体公司 | Radio receiver and method for AM suppression and dc-offset removal |
| CN101031126A (en) * | 2007-02-05 | 2007-09-05 | 京信通信技术(广州)有限公司 | Path-measuring receiver and method for processing base-band signal |
| CN101075814A (en) * | 2007-05-10 | 2007-11-21 | 京信通信系统（中国）有限公司 | Digital receiver system based on special digital medium-frequency structure |
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