CN103209147A - Multi-band millimeter wave receiver and multi-band millimeter wave receiving method - Google Patents

Multi-band millimeter wave receiver and multi-band millimeter wave receiving method Download PDF

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CN103209147A
CN103209147A CN2013100978804A CN201310097880A CN103209147A CN 103209147 A CN103209147 A CN 103209147A CN 2013100978804 A CN2013100978804 A CN 2013100978804A CN 201310097880 A CN201310097880 A CN 201310097880A CN 103209147 A CN103209147 A CN 103209147A
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millimeter
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local oscillation
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CN103209147B (en
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张崇富
张巧燕
邱昆
李长春
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University of Electronic Science and Technology of China
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Abstract

The invention discloses a multi-band millimeter wave receiver and a multi-band millimeter wave receiving method. A plurality of processing circuits are used for performing orthogonal mixing frequency conversion on signals in different frequency bands to obtain a plurality of intermediate frequency signals at fixed center frequency, image signals serving as negative frequency components are removed by a plurality of band-pass filters to realize image rejection, the analogue intermediate frequency signals are simultaneously digitalized and down-converted according to a band-pass sampling theorem by an analogue-to-digital converter, and original signals of a transmitter are recovered by subsequent digital signal processing. According to the receiver and the method, image rejection performance can be improved, and system structure is simplified, and is easy to implement and integrate.

Description

A kind of multiband millimeter wave receiver and method
Technical field
The invention belongs to the light carrier radio communication technical field, more specifically say, relate to a kind of multiband millimeter wave receiver and method.
Background technology
ROF(Radio over Fiber, the light-carried wireless access) technology is emerging research field, it is in conjunction with optical fiber communication and radio communication two big technology, taken full advantage of the high bandwidth of Optical Fiber Transmission, high reliability, low-loss, the mobility that has radio communication again simultaneously, characteristics such as point-to-multipoint access, be applicable to different modulation systems and different carrier frequencies, can be widely used in indoor covering, the inn, mobile base station, broadband wireless access, vehicle-mounted mobile communication, the aspects such as formation of cable TV and " ubiquitous a networked society " provide the access service of multiple business flexibly for the user.
The main thought of ROF technology is just radiofrequency signal to be modulated on the light in the central office, directly light signal is sent to telepoint base station then, only need carry out simple light-to-current inversion at the base station end and just can directly light signal be converted to radiofrequency signal, amplify the back and launch by antenna, user terminal obtains required useful signal with the signal receiving demodulation.At present, oneself reaches practical to the ROF technology of Japan in 1～2GHz frequency range, is mainly used in solving that rf wireless signal can't receive or extremely weak area (in tunnel, subway, megaplex thing).The researcher of U.S. Georgia Tech has developed the ROF test transmission platform of 40GHz millimere-wave band, and terminal equipment can receive steady and audible TV signal.American I BM company has issued 60GHz transceiver integrated chip in 2006, integrated most of RF and the analogue device of radio communication.Domesticly on the ROF Study on Technology, also obtain certain progress, but aspect the crucial integrated device and application technology thereof of ROF technology, still had a certain distance apart from other country.
Multiband millimeter wave wireless communication receiver is a kind of visual plant of ROF technical field.At present, common multiband millimeter wave receiver front end generally adopts heterodyne system or zero intermediate frequency formula to receive structure.The research of millimeter wave receiver and design (Shen Yurong. the research of millimeter wave receiver and design [J]. radio engineering, 2008,38(9): 62-64), mainly adopted traditional beat reception structure, earlier millimeter-wave signal is converted to intermediate-freuqncy signal, carries out subsequent treatment again.And beat reception structure radio-frequency front-end must arrange image frequency inhibition filtering, and to reach the inhibition to image signal, it is very big with the high Q RF filter difficulty of super band still to design tens GHz, and cost is very high, and is difficult to integrated.Multi-band RF receiver (Wang Jianqin. multi-band RF receiver [P]. Chinese patent: CN101241179,2008-08-13), what each RF(radio frequency) receive that path adopts in basic circuit structure also is the beat reception structure, there is same problem, and because the image-reject filter of high band need be a plurality of, difficulty is bigger.At the Direct Conversion Receiver (Li Zhiqiang that is used for the 60Ghz radio communication, Haiying ZHANG. be used for the Direct Conversion transceiver [P] of 60Ghz radio communication. Chinese patent: CN102611475A, 2012-07-25), adopt the method for single-conversion, direct radiofrequency signal with 59 to 64Ghz is converted to 0 to 1.08Ghz and 0 to 540Ghz analog baseband signal.The receiver of this kind zero-if architecture suppresses to have some improvement to mirror image, but because of the local oscillation signal frequency near rf frequency, local oscillation signal is leaked to the radio-frequency transmissions end easily to be launched, and has changed the signal spectrum of transmitting terminal, has the local oscillator leakage problem again.And above-mentioned receiver all adopts traditional base band mixing, and local frequency is very high, can increase manufacture difficulty and cost.In addition, in the Digital Signal Processing part of traditional millimeter wave receiver, Digital Down Convert generally adopt the digital quadrature mixing down-conversion or based on the Digital Down Convert mode of multiphase filter to obtain digital baseband signal, increased the complexity that receiver signal is handled to a certain extent.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of multiband millimeter wave receiver and method are provided, adopt the quadrature mixing to be combined with plural bandpass filtering, improve the mirror image rejection, simplied system structure makes it easier realization and integrated.
For achieving the above object, multiband millimeter wave receiver of the present invention is characterized in that comprising:
An antenna receiving unit, its frequency range of receiving covers all frequency range x that the multiband millimeter wave receiver is supported i, 1≤i≤X, the number of frequency bands that X supports for the multiband millimeter wave receiver; Be used for receiving millimeter-wave signal, and millimeter-wave signal is sent to control module;
A control module is used for the millimeter-wave signal that the reception antenna receiving system transmits, according to the frequency range x under the millimeter-wave signal iMillimeter-wave signal is sent to the signal amplifier of corresponding frequency band treatment circuit; And according to the centre frequency f of millimeter-wave signal RFSend the control signal that local oscillation signal generates to frequency synthesizer, comprise local frequency
Figure BDA00002961405500031
f IfBe the fixedly output IF-FRE that N th harmonic mixer group arranges, N is the mixing number of times of N th harmonic mixer group;
A frequency synthesizer, the control signal that is used for transmitting according to control module is synthesized local oscillation signal L (t), sends local oscillation signal to orthocoupler;
An orthocoupler is for the local oscillation signal L that local oscillation signal is divided into the two-way quadrature I(t), L Q(t), and respectively send X N th harmonic mixer group to;
X signal amplifier is used for the millimeter-wave signal of corresponding frequency band is amplified, and the reception frequency range of i signal amplifier is x i
X signal shunt, the millimeter-wave signal that is used for amplifying is divided into identical two-way millimeter-wave signal X (t), sends corresponding N th harmonic mixer group respectively to;
X N th harmonic mixer group is used for millimeter-wave signal and local oscillation signal are carried out N mixing, and N selects according to actual conditions, and the processing frequency range of i N th harmonic mixer group is x iEach N th harmonic mixer group comprises:
A N th harmonic mixer is used for one road millimeter-wave signal X (t) and one road local oscillation signal L I(t) carry out N mixing, obtain intermediate-freuqncy signal output Y I(t) and send complex bandpass filters to;
A N th harmonic mixer is used for another road millimeter-wave signal X (t) and another road local oscillation signal L Q(t) carry out N mixing, obtain intermediate-freuqncy signal output Y Q(t) and send complex bandpass filters to;
A complex bandpass filters, its centre frequency f BPF=f If, filtering bandwidth B BPF＞B RF, B RFBe the millimeter-wave signal bandwidth; Be used for intermediate-freuqncy signal output Y I(t) and Y Q(t) complex signal Y (the t)=Y that is combined into I(t)+jY Q(t) carry out filtering, remove image signal, obtain useful signal, export two useful signal component Z I(t) and Z Q(t);
Two analog to digital converters are used for respectively to useful signal component Z I(t) and Z Q(t) carry out bandpass sampling, with useful signal component Z I(t) and Z Q(t) be converted to two ways of digital signals W I(t) and W Q(t), sample frequency
Figure BDA00002961405500041
And f s〉=n * 2B, B are the baseband signal bandwidth of transmitting terminal information source, realize the signal down-conversion simultaneously, make digital signal W I(t) and W Q(t) become baseband signal;
A digital signal processing module is used for two ways of digital signals W I(t) and W Q(t) carry out Digital Signal Processing, comprise digital low-pass filtering, demodulation, recover the original transmission signal of transmitting terminal emission.
Wherein, antenna receiving unit is adaptive array antenna receiving apparatus.
Wherein, amplifier is low noise amplifier.
Wherein, the N th harmonic mixer adopts pipe to formula N subharmonic mixting circuit.
Wherein, mixing times N=4 of N th harmonic mixer.
Further, also comprise:
Two variable gain amplifiers are used for respectively with useful signal component Z I(t) and Z Q(t) amplify also firm power;
A complex bandpass filters is used for useful signal component Z I(t) and Z Q(t) complex signal of Zu Chenging carries out filtering, removes useful signal component Z I(t) and Z Q(t) noise in, and with filtered useful signal component Z I(t) and Z Q(t) send analog to digital converter respectively to.
For realizing goal of the invention, multiband millimeter wave method of reseptance of the present invention is characterized in that may further comprise the steps:
(1), the number of frequency bands of multiband millimeter wave receiver support is designated as X, each frequency range is expressed as x respectively i, 1≤i≤X receives the millimeter-wave signal of a certain frequency range by antenna receiving unit, and sends control module to;
(2), according to the frequency range x of millimeter-wave signal iMillimeter-wave signal is forwarded to the treatment circuit of corresponding frequency band, and to the control signal that frequency synthesizer transmission local oscillation signal generates, comprises the local frequency of local oscillation signal
Figure BDA00002961405500051
f IfBe the fixedly output IF-FRE that the N th harmonic mixer arranges, N is the number of times of N th harmonic mixer group; Frequency synthesizer generates corresponding local oscillation signal L (t) according to control signal, by orthocoupler local oscillation signal is divided into the local oscillation signal L of two-way quadrature again I(t), L Q(t);
(3), the signal amplifier of alignment processing circuit amplifies millimeter-wave signal, and the millimeter-wave signal after will amplifying is divided into two same signals X (t);
(4), the N th harmonic mixer of i group is respectively to the local oscillation signal L of two-way millimeter-wave signal X (t) with the two-way quadrature I(t), L Q(t) carry out the quadrature mixing, obtain two-way intermediate-freuqncy signal output Y I(t) and Y Q(t);
(5), adopt centre frequency f BPF=f If, filtering bandwidth B BPF＞B RFComplex bandpass filters, B RFBe the millimeter-wave signal bandwidth, to two-way intermediate-freuqncy signal output Y I(t) and Y Q(t) the complex intermediate frequency signal Y of Zu Chenging (t)=Y I(t)+jY Q(t) carry out filtering, complex signal Y (t) can be expressed as
Figure BDA00002961405500052
Wherein Be useful signal, Be image signal, A represents signal strength signal intensity, ω If=2 π f IfExpression intermediate-freuqncy signal angular frequency, t represents the time; Through after the complex bandpass filters, positive frequency component
Figure BDA00002961405500055
By, negative frequency component
Figure BDA00002961405500056
Be suppressed, obtain two-way useful signal component Z I(t) and Z Q(t);
(6), the useful signal component is carried out digitlization, sample frequency
Figure BDA00002961405500057
And f s〉=n * 2B, wherein k and n are respectively positive integer, and B is the baseband signal bandwidth of transmitting terminal information source, and the digital signal that obtains after the sampling can be down-converted to base band by intermediate frequency simultaneously, obtains two ways of digital signals W I(t) and W Q(t);
(7), to digital signal W I(t) and W Q(t) subsequent treatment comprises digital low-pass filtering, demodulation, recovers the original transmission signal of transmitting terminal.
Wherein, local oscillation signal is
Figure BDA00002961405500061
The local oscillation signal of the two-way quadrature that is divided into is respectively cos2 π f LOT, sin2 π f LOT.
Further, further comprising the steps of: as before the digitlization of useful signal component, to adopt variable gain amplifier to useful signal component Z I(t) and Z Q(t) amplify also firm power, again by the noise in the plural bandpass filtering removal useful signal component, improve the signal quality of useful signal component.
Goal of the invention of the present invention is achieved in that
Multiband millimeter wave receiver of the present invention and method, adopt a plurality for the treatment of circuits that the signal of different frequency range is used quadrature mixing frequency conversion, be fixed the complex intermediate frequency signal of centre frequency, to remove as the image signal of negative frequency components by complex bandpass filters, the realization mirror image suppresses, and again analog if signal is passed through analog to digital converter, according to bandpass sample theory, finish the digitized down-conversion that realizes simultaneously, recover the primary signal of transmitting terminal again through follow-up Digital Signal Processing.
Multiband millimeter wave receiver of the present invention and method have following beneficial effect:
1., adopt the mixing of N subharmonic, reduced the frequency of local oscillation signal, the selecting frequency synthesizer by the synthetic corresponding frequencies of CPU control, had both solved the problem that manufactures and designs difficulty as local oscillator in addition, had also increased the flexibility that the multiband millimeter-wave signal receives.
2., General System needs the high-quality radio frequency band filter image frequency of disinthibiting, and high-quality radio-frequency filter difficult design, and it is integrated to need the exponent number height to be not easy to, the present invention adopts quadrature mixing and multiple band pass filter, solve mirror image when realizing the millimeter-wave signal frequency conversion and suppressed problem, need not radio-frequency filter, simplified the design difficulty of system, improve level of integrated system.
3., the present invention adopts the frequency mixer of fixed center frequency, the signal down-conversion obtains required baseband signal thereby can reach analog signal figureization and make by bandpass sampling, simplified the receiving terminal structure.The mixing of fixed center frequency makes that follow-up signal processing circuit of intermediate frequency need not to change, and saves cost.
Description of drawings
Fig. 1 is the system architecture figure of a kind of embodiment of multiband millimeter wave receiver of the present invention;
Fig. 2 is a kind of embodiment flow chart of multiband millimeter wave method of reseptance of the present invention;
Fig. 3 is the schematic diagram of quadrature mixing among the present invention;
Fig. 4 is the schematic diagram of plural bandpass filtering among the present invention;
Fig. 5 adopts the present invention's single channel millimeter-wave signal under complex field to receive the spectrum analysis figure that handles.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.What need point out especially is that in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these were described in here and will be left in the basket.
Embodiment
Fig. 1 is the system architecture figure of a kind of embodiment of multiband millimeter wave receiver of the present invention.As shown in Figure 1, multiband millimeter wave receiver of the present invention comprises that mainly multi-frequency band radio-frequency receives matching module, local oscillator module, mirror image inhibition harmonic mixing module, bandpass sampling down conversion module.
Multi-frequency band radio-frequency receives matching module and comprises:
An antenna receiving unit 1, its frequency range of receiving covers all frequency range x that the multiband millimeter wave receiver is supported i, 1≤i≤X, the number of frequency bands that X supports for the multiband millimeter wave receiver; Be used for receiving millimeter-wave signal, and millimeter-wave signal is sent to control module 2.
In the present embodiment, antenna receiving unit 1 adopts adaptive array antenna receiving apparatus.
A control module 2 is used for the millimeter-wave signal that reception antenna receiving system 1 transmits, according to the frequency range x under the millimeter-wave signal iMillimeter-wave signal is sent to the signal amplifier 5 of corresponding frequency band treatment circuit; And according to the centre frequency f of millimeter-wave signal RFSend the control signal that local oscillation signal generates to frequency synthesizer 3, comprise local frequency
Figure BDA00002961405500081
f IfBe the fixedly output IF-FRE that N th harmonic mixer group 7 arranges, N is the mixing number of times of N th harmonic mixer group 7.
The local oscillator module comprises:
A frequency synthesizer 3 is used for synthesizing local oscillation signal L (t) according to the control signal that control module 2 transmits, and sends local oscillation signal to orthocoupler 4.
An orthocoupler 4 is for the local oscillation signal L that local oscillation signal is divided into the two-way quadrature I(t), L Q(t), and respectively send X N th harmonic mixer group 7 to.
Mirror image suppresses the harmonic mixing module and comprises:
X signal amplifier 5 is used for the millimeter-wave signal of corresponding frequency band is amplified, and the reception frequency range of i signal amplifier is x i
In the present embodiment, signal amplifier adopts low noise amplifier (LNA, Low Noise Amplifier).
X signal shunt 6, the millimeter-wave signal that is used for amplifying is divided into identical two-way millimeter-wave signal X (t), sends corresponding N th harmonic mixer group 7 respectively to.
X N th harmonic mixer group 7 is used for millimeter-wave signal and local oscillation signal are carried out N mixing, and N selects according to actual conditions, and the processing frequency range of i N th harmonic mixer group is x iEach N th harmonic mixer group comprises:
A N th harmonic mixer 71 is used for one road millimeter-wave signal X (t) and one road local oscillation signal L I(t) carry out N mixing, obtain intermediate-freuqncy signal output Y I(t) and send complex bandpass filters (BPF, Band Pass Filter) 8 to.
A N th harmonic mixer 72 is used for another road millimeter-wave signal X (t) and another road local oscillation signal L Q(t) carry out N mixing, obtain intermediate-freuqncy signal output Y Q(t) and send complex bandpass filters (BPF) 8 to.
In the present embodiment, N th harmonic mixer 71 all adopts pipe to formula N subharmonic mixting circuit with N th harmonic mixer 72, and its local oscillator operating frequency is fundamental wave mixing device local oscillator operating frequency
Figure BDA00002961405500091
Mixing times N=4.
A complex bandpass filters (BPF) 8, its centre frequency f BPF=f If, filtering bandwidth B BPF＞B RF, B RFBe the millimeter-wave signal bandwidth; Be used for intermediate-freuqncy signal output Y I(t) and Y Q(t) complex signal Y (the t)=Y that is combined into I(t)+jY Q(t) carry out filtering, remove image signal, obtain useful signal, export two useful signal component Z I(t) and Z Q(t).
Two variable gain amplifiers (VGA, Variable Gain Amplifier) 9 are used for respectively with useful signal component Z I(t) and Z Q(t) amplify also firm power.
A complex bandpass filters (BPF) 10 is used for useful signal component Z I(t) and Z Q(t) be combined into one road complex signal and carry out filtering, remove useful signal component Z I(t) and Z Q(t) noise in, and with filtered useful signal component Z I(t) and Z Q(t) send analog to digital converter (ADC, Analog-to-Digital Converter) 10 respectively to.
Variable gain amplifier 9 is optional module with complex bandpass filters 10, and it mainly act as and improves useful signal component Z I(t) and Z Q(t) signal quality.
The bandpass sampling down conversion module comprises:
Two analog to digital converters (ADC) 10 are used for respectively to useful signal component Z I(t) and Z Q(t) carry out bandpass sampling, with useful signal component Z I(t) and Z Q(t) be converted to two ways of digital signals W I(t) and W Q(t), sample frequency
Figure BDA00002961405500092
And f s〉=n * 2B, wherein k and n are respectively positive integer, and B is the baseband signal bandwidth of transmitting terminal information source, realizes the signal down-conversion simultaneously, makes digital signal W I(t) and W Q(t) become baseband signal.
A digital signal processing module is used for two ways of digital signals W I(t) and W Q(t) carry out Digital Signal Processing, comprise digital low-pass filtering, demodulation, recover the original transmission signal of transmitting terminal emission.
Fig. 2 is a kind of embodiment flow chart of multiband millimeter wave method of reseptance of the present invention.As shown in Figure 2, multiband millimeter wave method of reseptance of the present invention may further comprise the steps:
Step S201: the number of frequency bands of multiband millimeter wave receiver support is designated as X, and each frequency range is expressed as x respectively i, 1≤i≤X, antenna receiving unit receive the millimeter-wave signal of a certain frequency range, and send control module to.
In the present embodiment, the multiband millimeter wave receiver supports that centre frequency is 40GHz, 50GHz, 60GHz, bandwidth B RFThree kinds of frequency range millimeter-wave signals for 300MHz.
Step S202: control module is according to the frequency range x of millimeter-wave signal iMillimeter-wave signal is forwarded to the treatment circuit of corresponding frequency band, and to the control signal that frequency synthesizer transmission local oscillation signal generates, comprises the local frequency of local oscillation signal
Figure BDA00002961405500101
f IfBe the fixedly output IF-FRE that the N th harmonic mixer arranges, N is the number of times of N th harmonic mixer group; Frequency synthesizer generates corresponding local oscillation signal L (t) according to control signal, by orthocoupler local oscillation signal is divided into the local oscillation signal L of two-way quadrature again I(t), L Q(t).
The millimeter-wave signal that with the centre frequency is 60GHz bandwidth 300MHz is example, and control module receives the millimeter-wave signal that is transmitted by adaptive array antenna, and first control frequency synthesizer synthesizes the required local frequency of 60GHz millimeter wave frequency conversion.Present embodiment adopts 4 subharmonic mixing, and the fixedly output intermediate frequency of setting 4 th harmonic mixers is 400MHz, then f LO = 1 N ( f if - f RF ) = 1 4 ( 60 GHz - 400 MHz ) = 14.9 GHz , Gating circuit one then, i.e. 60GHz millimeter-wave signal treatment circuit.When millimeter-wave signal is 50GHz, enter circuit two, the synthetic local frequency of frequency synthesizer is 12.4GHz; When millimeter-wave signal is 40GHz, enter circuit three, the synthetic local frequency of frequency synthesizer is 9.9GHz.
In the present embodiment, the local oscillation signal that adopts is
Figure BDA00002961405500103
The local oscillation signal of the two-way quadrature that is divided into is respectively cos2 π f LOT, sin2 π f LOT.
Step S203: the signal amplifier of alignment processing circuit amplifies millimeter-wave signal, and the millimeter-wave signal after will amplifying is divided into two same signals X (t).
Adopt the millimeter-wave signal of low noise amplifier LNA to amplify in the present embodiment, the loss that the compensation radiofrequency signal causes in the process of long Distance Transmission, and noise is introduced less.
Step S204: the N th harmonic mixer of i group is respectively to the local oscillation signal L of two-way millimeter-wave signal X (t) with the two-way quadrature I(t), L Q(t) carry out the quadrature mixing, obtain two-way intermediate-freuqncy signal output Y I(t) and Y Q(t).
Fig. 3 is the schematic diagram of quadrature mixing among the present invention.As shown in Figure 3, in the present embodiment, local oscillation signal is
Figure BDA00002961405500111
Local frequency f LO=14.9GHz, the local oscillation signal of two-way quadrature are respectively cos2 π f LOT, sin2 π f LOT carries out 4 subharmonic mixing with two-way millimeter-wave signal X (t) respectively, obtains the output signal Y of two-way quadrature I(t)=X (t) * cos2 π 4f LOT, Y Q(t)=X (t) * sin2 π 4f LOT, wherein cos 2 π 4 f LO t = 1 2 ( e - j 2 π 4 f LO t + e j 2 π 4 f LO t ) , sin 2 π 4 f LO t = j 2 ( e j 2 π 4 f LO t - e - j 2 π 4 f LO t ) , Wherein t is time variable.Hence one can see that passes through the compound frequency that the quadrature mixing realizes millimeter-wave signal and local oscillation signal.
Step S205: adopt centre frequency f BPF=f If, filtering bandwidth B BPF＞B RFComplex bandpass filters, B wherein RFBe the millimeter-wave signal bandwidth, to two-way intermediate-freuqncy signal output Y I(t) and Y Q(t) the complex intermediate frequency signal Y of Zu Chenging (t)=Y I(t)+jY Q(t) carry out filtering, existing useful signal also has image signal among the complex signal Y (t), can be expressed as
Figure BDA00002961405500114
Wherein Be useful signal,
Figure BDA00002961405500116
Be image signal, A represents signal strength signal intensity, ω If=2 π f IfExpression intermediate-freuqncy signal angular frequency, t represents the time; Through after the complex bandpass filters, positive frequency component
Figure BDA00002961405500117
By, negative frequency component Be suppressed, thereby realization obtains two-way useful signal component Z to the inhibition of image signal I(t) and Z Q(t).
Fig. 4 is the schematic diagram of plural bandpass filtering among the present invention.As shown in Figure 4, the transfer function of complex bandpass filters is
Figure BDA00002961405500119
Wherein S is the multiple parameter of granny rag Lars conversion of low pass filter transfer function, and ω is the angular frequency variable of time domain variable t correspondence in Fourier transform, and S=j ω, C are the condensances of complex bandpass filters, ω IfThe central angle frequency of expression complex bandpass filters.Complex intermediate frequency signal Y (t)=Y I(t)+jY Q(t) Fourier transform frequency response function Y (j ω)=Y I(j ω)+jY Q(j ω).Output complex signal Z (the t)=Z of complex bandpass filters I(t)+jZ Q(t), its Fourier transform frequency response function Z (j ω)=Z I(j ω)+jZ Q(j ω), because Z ( jω ) = Y ( jω ) H ( jω ) = Y ( jω ) 1 SC - j ω if C , Therefore can get: Z I ( jω ) = [ Y I ( jω ) - ω if CZ Q ( jω ) ] 1 SC , Z Q ( jω ) = [ Y Q ( jω ) + ω if CZ I ( jω ) ] 1 SC . Carry out the design of complex bandpass filters thus.
But the design of complex bandpass filters and operation principle list of references: Qiu Cong. a kind of method for designing of active RC complex filter [J]. microelectronics and computer, 2009,26(11): 135-138.
Step 206: adopt variable gain amplifier to useful signal component Z I(t) and Z Q(t) amplify also firm power, again by the noise in the plural bandpass filtering removal useful signal component, improve the signal quality of useful signal component.
Step 207: the useful signal component is carried out digitlization, sample frequency
Figure BDA00002961405500124
And f s〉=n * 2B, wherein k and n are respectively positive integer, and B is the baseband signal bandwidth of transmitting terminal information source, and the digital signal that obtains after the sampling can be down-converted to base band by intermediate frequency simultaneously, obtains two ways of digital signals W I(t) and W Q(t).
Step S208: to digital signal W I(t) and W Q(t) subsequent treatment comprises digital low-pass filtering, demodulation, recovers the original transmission signal of transmitting terminal.
Fig. 5 adopts the present invention's single channel millimeter-wave signal under complex field to receive the spectrum analysis figure that handles.As shown in Figure 5, receive millimeter-wave signal through amplifying, obtaining two-way millimeter-wave signal X (t) along separate routes, its frequency spectrum is shown in A point signal spectrum figure, useful signal is because be real signal, so its frequency spectrum is the conjugation symmetry, existing positive frequency component also has negative frequency component, its centre frequency and local frequency f LOAt a distance of ω IfImage signal also is real signal, and its centre frequency and useful signal are about the local oscillator symmetry.
When carrying out real mixing, for example local oscillator is cos2 π f LOT, the positive frequency component of desired signal and image signal and negative frequency component are moved intermediate frequency and cause aliasing by two impulses of mixing local oscillator conjugation symmetry respectively.Adopt compound frequently in the present invention, namely adopt
Figure BDA00002961405500125
As the mixing local oscillator, its frequency spectrum is shown in B point signal spectrum figure, and the local frequency place has only single impulse on frequency spectrum, carry out the quadrature mixing after, have only the Y (t) of the positive frequency part of useful signal and image signal to move on to [ω If, ω If] between intermediate frequency zone, between intermediate frequency zone in, useful signal is the positive frequency component, image signal is negative frequency components, therefore signal aliasing can not take place in its frequency spectrum shown in C point signal spectrum figure.
C point signal with the image signal filtering of negative frequency components, stays the useful signal Z (t) of positive frequency part again by complex bandpass filters, and its frequency spectrum is shown in D point signal spectrum figure, thereby the realization mirror image suppresses.Because sampling is a kind of process of multiplicative mixing, by input analog signal and cycle impulse signal δ T(t) realization of multiplying each other.The analog if signal that note is input to before the analog to digital converter is Z (t)=Z I(t)+jZ Q(t), then the analog to digital converter sampled output signal is W ( t ) = Z ( t ) δ T ( t ) = Σ ∞ n = - ∞ Z ( nT s ) δ ( t - nT s ) Wherein, t is time variable,
Figure BDA00002961405500132
Be the sampling period.Sampled output signal is that the frequency spectrum of W (t) is
Figure BDA00002961405500133
ω is the angular frequency variable of time domain variable n correspondence in Fourier transform among the sampling back signal W (t), ω s=2 π f sBe the sampling angular frequency.By formula as can be known, digital signal W (t)=W on frequency spectrum I(t)+jW Q(t) frequency spectrum is the frequency spectrum of D point signal Z (t) with interval ω sLeft and right sides frequency displacement because ω s=2 π f s=2 π f If/ k=ω If/ k, so one of them frequency spectrum will move to base band, its frequency spectrum is shown in E point signal spectrum figure.In digital signal processing module, can obtain baseband signal by a wave digital lowpass filter, its frequency spectrum is namely realized the down-conversion of intermediate-freuqncy signal Z (t) shown in F point signal spectrum figure, pass through follow-up Digital Signal Processing again, just can recover the original transmission signal of transmitting terminal.
Although above the illustrative embodiment of the present invention is described; so that those skilled in the art understand the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and the spirit and scope of the present invention determined in, these variations are apparent, all utilize innovation and creation that the present invention conceives all at the row of protection.

Claims (9)

1. multiband millimeter wave receiver is characterized in that comprising:
An antenna receiving unit (1), its frequency range of receiving covers all frequency range x that the multiband millimeter wave receiver is supported i, 1≤i≤X, the number of frequency bands that X supports for the multiband millimeter wave receiver; Be used for receiving millimeter-wave signal, and millimeter-wave signal is sent to control module (2);
A control module (2) is used for the millimeter-wave signal that reception antenna receiving system (1) transmits, according to the frequency range x under the millimeter-wave signal iMillimeter-wave signal is sent to the signal amplifier (5) of corresponding frequency band treatment circuit; And according to the centre frequency f of millimeter-wave signal RFSend the control signal that local oscillation signal generates to frequency synthesizer (3);
A frequency synthesizer (3), the control signal that is used for transmitting according to control module (2) is synthesized local oscillation signal L (t), sends local oscillation signal to orthocoupler (4);
An orthocoupler (4) is for the local oscillation signal L that local oscillation signal is divided into the two-way quadrature I(t), L Q(t), and respectively send X N th harmonic mixer group (7) to;
X signal amplifier (5) is used for the millimeter-wave signal of corresponding frequency band is amplified, and the reception frequency range of i signal amplifier is x i
X signal shunt (6), the millimeter wave that is used for amplifying is divided into identical two-way millimeter-wave signal X (t), sends corresponding bank of mixers (7) respectively to;
X N th harmonic mixer group (7) is used for millimeter-wave signal and local oscillation signal are carried out N mixing, and the processing frequency range of i N th harmonic mixer group is x iEach N th harmonic mixer group comprises:
A N th harmonic mixer (71) is used for one road millimeter-wave signal X (t) and one road local oscillation signal L I(t) carry out N mixing, obtain intermediate-freuqncy signal output Y I(t) and send complex bandpass filters (8) to;
A N th harmonic mixer (72) is used for another road millimeter-wave signal X (t) and another road local oscillation signal L Q(t) carry out N mixing, obtain intermediate-freuqncy signal output Y Q(t) and send complex bandpass filters (8) to;
A complex bandpass filters (8), its centre frequency f BPF=f If, filtering bandwidth B BPF＞B RF, B RFBe the millimeter-wave signal bandwidth; Be used for intermediate-freuqncy signal output Y I(t) and Y Q(t) complex signal Y (the t)=Y that is combined into I(t)+jY Q(t) carry out filtering, remove image signal, obtain useful signal, export two useful signal component Z I(t) and Z Q(t);
Two analog to digital converters (11) are used for respectively to useful signal component Z I(t) and Z Q(t) carry out bandpass sampling, with useful signal component Z I(t) and Z Q(t) be converted to two ways of digital signals W I(t) and W Q(t), sample frequency
Figure FDA00002961405400021
And f s〉=n * 2B realizes the signal down-conversion simultaneously, makes digital signal W I(t) and W Q(t) become baseband signal;
A digital signal processing module (12) is used for two ways of digital signals W I(t) and W Q(t) carry out Digital Signal Processing, comprise digital low-pass filtering, demodulation, recover the signal of transmitting terminal emission.
2. multiband millimeter wave receiver according to claim 1 is characterized in that, described antenna receiving unit (1) is adaptive array antenna receiving apparatus.
3. multiband millimeter wave receiver according to claim 1 is characterized in that, described amplifier (5) is low noise amplifier.
4. multiband millimeter wave receiver according to claim 1 is characterized in that, described N th harmonic mixer adopts pipe to formula N subharmonic mixting circuit.
5. multiband millimeter wave receiver according to claim 1 is characterized in that, mixing times N=4 of described N th harmonic mixer.
6. according to the arbitrary described multiband millimeter wave receiver of claim 1 to 5, it is characterized in that, also comprise:
Two variable gain amplifiers (9) are used for respectively with useful signal component Z I(t) and Z Q(t) amplify also firm power;
A complex bandpass filters (10) is used for useful signal component Z I(t) and Z Q(t) complex signal of Zu Chenging carries out filtering, removes useful signal component Z I(t) and Z Q(t) noise in.
7. multiband millimeter wave method of reseptance is characterized in that may further comprise the steps:
(1), the number of frequency bands of multiband millimeter wave receiver support is designated as X, each frequency range is expressed as x respectively i, 1≤i≤X receives the millimeter-wave signal of a certain frequency range by antenna receiving unit, and sends control module to;
(2), according to the frequency range x of millimeter-wave signal iMillimeter-wave signal is forwarded to the treatment circuit of corresponding frequency band, and to the control signal that frequency synthesizer transmission local oscillation signal generates, comprises the local frequency of local oscillation signal
Figure FDA00002961405400031
f IfBe the fixedly output IF-FRE that the N th harmonic mixer arranges, N is the number of times of N th harmonic mixer group; Frequency synthesizer generates corresponding local oscillation signal L (t) according to control signal, by orthocoupler local oscillation signal is divided into the local oscillation signal L of two-way quadrature again I(t), L Q(t);
(3), the signal amplifier of alignment processing circuit amplifies millimeter-wave signal, and the millimeter-wave signal after will amplifying is divided into two same signals X (t);
(4), the N th harmonic mixer of i group is respectively to the local oscillation signal L of two-way millimeter-wave signal X (t) with the two-way quadrature I(t), L Q(t) carry out the quadrature mixing, obtain two-way intermediate-freuqncy signal output Y I(t) and Y Q(t);
(5), adopt centre frequency f BPF=f If, filtering bandwidth B BPF＞B RFComplex bandpass filters to two-way intermediate-freuqncy signal output Y I(t) and Y Q(t) the complex intermediate frequency signal Y of Zu Chenging (t)=Y I(t)+jY Q(t) carry out filtering, complex signal Y (t) can be expressed as
Figure FDA00002961405400032
Wherein
Figure FDA00002961405400033
Be useful signal,
Figure FDA00002961405400034
Be image signal, ω If=2 π f IfExpression intermediate-freuqncy signal angular frequency, t represents the time; Through after the complex bandpass filters, positive frequency component
Figure FDA00002961405400035
By, negative frequency component
Figure FDA00002961405400036
Be suppressed, obtain two-way useful signal component Z I(t) and Z Q(t);
(6), the useful signal component is carried out digitlization, sample frequency
Figure FDA00002961405400037
And f s〉=n * 2B, wherein k and n are respectively positive integer, and B is the baseband signal bandwidth of transmitting terminal information source, and the digitized signal that obtains after the sampling can be down-converted to base band by intermediate frequency simultaneously, obtains two ways of digital signals W I(t) and W Q(t);
(7), to digital signal W I(t) and W Q(t) subsequent treatment comprises digital low-pass filtering, demodulation, recovers the original transmission signal of transmitting terminal.
8. multiband millimeter wave receiving handling method according to claim 7 is characterized in that described local oscillation signal is
Figure FDA00002961405400041
The local oscillation signal of the two-way quadrature that is divided into is respectively cos2 π f LOT, sin2 π f LOT.
9. according to claim 7 or 8 described multiband millimeter wave method of reseptances, it is characterized in that, further comprising the steps of: as before the digitlization of useful signal component, to adopt variable gain amplifier to useful signal component Z I(t) and Z Q(t) amplify also firm power, again by the noise in the plural bandpass filtering removal useful signal component.
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