CN103209147B - A kind of multiband millimeter wave receiver and method - Google Patents

A kind of multiband millimeter wave receiver and method Download PDF

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CN103209147B
CN103209147B CN201310097880.4A CN201310097880A CN103209147B CN 103209147 B CN103209147 B CN 103209147B CN 201310097880 A CN201310097880 A CN 201310097880A CN 103209147 B CN103209147 B CN 103209147B
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signal
frequency
millimeter
wave
local oscillation
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CN201310097880.4A
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CN103209147A (en
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张崇富
张巧燕
邱昆
李长春
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电子科技大学
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Abstract

The invention discloses a kind of multiband millimeter wave receiver and method, multiple treatment circuit is adopted to use quadrature downconvert frequency conversion to the signal of different frequency range, be fixed the complex intermediate frequency signal of centre frequency, by complex bandpass filters, the image signal as negative frequency components is removed, realize mirror image to suppress, again analog if signal is passed through analog to digital converter, according to bandpass sample theory, complete and digitizedly realize down-conversion simultaneously, then recover the primary signal of transmitting terminal through subsequent digital signal process.Adopt the present invention can improve mirror image rejection, simplied system structure, make it more easily to realize and integrated.

Description

A kind of multiband millimeter wave receiver and method

Technical field

The invention belongs to 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, light-carried wireless accesses) technology is emerging research field, it is in conjunction with optical fiber communication and the large technology of radio communication two, take full advantage of the high bandwidth of Optical Fiber Transmission, high reliability, low-loss, there is again the mobility of radio communication simultaneously, the features such as point-to-multipoint access, be applicable to different modulation systems and different carrier frequencies, in-door covering can be widely used in, inn, mobile base station, broadband wireless access, vehicle-mounted mobile communicates, the aspects such as the formation of cable TV and " ubiquitous a networked society ", for user provides the access service of multiple business flexibly.

The main thought of ROF technology be in central office just by rf-signal modulation on light, then direct light signal is sent to telepoint base station, only need carry out simple light-to-current inversion in base station end and just directly light signal can be converted to radiofrequency signal, gone out by antenna transmission after amplification, Signal reception demodulation is obtained required useful signal by user terminal.At present, in 1 ~ 2GHz frequency range, oneself reaches practical to the ROF technology of Japan, is mainly used in solving rf wireless signal and cannot receives or extremely weak area (as in tunnel, subway, megaplex thing).The researcher of Georgia Tech of the U.S. have 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 issued 60GHz transceiver integrated chip in 2006, was integrated with most of RF and the analogue device of radio communication.Domesticly also to make some progress in the research of ROF technology, but in the crucial integrated device and application technology thereof of ROF technology, still have 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.Millimeter wave receiver research & design (Shen Yurong. the research & design [J] of millimeter wave receiver. radio engineering, 2008,38(9): 62-64), mainly have employed traditional beat reception structure, first millimeter-wave signal is converted to intermediate-freuqncy signal, then carries out subsequent treatment.And beat reception structure radio-frequency front-end must arrange image frequency suppression filtering, to reach the suppression to image signal, but design tens GHz are very large with the high Q RF filter difficulty of super band, 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), each RF(radio frequency) receiving path adopts in basic circuit structure is also beat reception structure, there is same problem, and due to high band image-reject filter need multiple, difficulty is larger.At the Direct Conversion Receiver (Li Zhiqiang for 60Ghz radio communication, Haiying ZHANG. for the Direct Conversion transceiver [P] of 60Ghz radio communication. Chinese patent: CN102611475A, 2012-07-25), adopt the method for single-conversion, directly the radiofrequency signal of 59 to 64Ghz is converted to the analog baseband signal of 0 to 1.08Ghz and 0 to 540Ghz.The receiver of this kind of zero-if architecture suppresses to have some improvement to mirror image, but because local oscillation signal frequency is close to rf frequency, local oscillation signal is easily leaked to radio-frequency transmissions end and launches, and changes the signal spectrum of transmitting terminal, there is again local oscillator leakage problem.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 signal process part of traditional millimeter wave receiver, Digital Down Convert generally adopt digital quadrature mixing down-conversion or based on the Digital Down Convert mode of multiphase filter to obtain digital baseband signal, add the complexity of receiver signal process to a certain extent.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, a kind of multiband millimeter wave receiver and method are provided, adopt quadrature downconvert to be combined with plural bandpass filtering, raising mirror image rejection, simplied system structure, make it more easily to realize 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 reception range covers all frequency range x that multiband millimeter wave receiver is supported i, 1≤i≤X, X is the number of frequency bands that multiband millimeter wave receiver is supported; For receiving millimeter-wave signal, and millimeter-wave signal is sent to control module;

A control module, for the millimeter-wave signal that reception antenna receiving system transmits, the frequency range x belonging to 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 of local oscillation signal generation to frequency synthesizer, comprise local frequency f iffor the fixing output IF-FRE that N th harmonic mixer group is arranged, N is the mixing number of times of N th harmonic mixer group;

A frequency synthesizer, for control signal synthesis local oscillation signal L (t) transmitted according to control module, sends local oscillation signal to orthocoupler;

An orthocoupler, for the local oscillation signal L being divided into two-way orthogonal local oscillation signal i(t), L q(t), and send X N th harmonic mixer group respectively to;

X signal amplifier, for being amplified by the millimeter-wave signal of corresponding frequency band, the reception frequency range of i-th signal amplifier is x i;

X signal shunt, for the millimeter-wave signal of amplification is divided into identical two-way millimeter-wave signal X (t), sends corresponding N th harmonic mixer group to respectively;

X N th harmonic mixer group, for millimeter-wave signal and local oscillation signal are carried out N mixing, N selects according to actual conditions, and the process frequency range of i-th N th harmonic mixer group is x i; Each N th harmonic mixer group comprises:

A N th harmonic mixer, for by road millimeter-wave signal X (t) and a road local oscillation signal L it () carries out N mixing, obtain intermediate-freuqncy signal and export Y it () also sends complex bandpass filters to;

A N th harmonic mixer, for by another road millimeter-wave signal X (t) and another road local oscillation signal L qt () carries out N mixing, obtain intermediate-freuqncy signal and export Y qt () also sends complex bandpass filters to;

A complex bandpass filters, its centre frequency f bPF=f if, filtering bandwidth B bPF> B rF, B rFfor millimeter-wave signal bandwidth; For exporting Y to intermediate-freuqncy signal i(t) and Y qt complex signal Y (t) that () is combined into=Y i(t)+jY qt () carries 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, for respectively to useful signal component Z i(t) and Z qt () carries out bandpass sampling, by useful signal component Z i(t) and Z qt () is converted to two ways of digital signals W i(t) and W q(t), sample frequency and f s>=n × 2B, B is the baseband signal bandwidth of transmitting terminal information source, realizes signal down-conversion simultaneously, makes digital signal W i(t) and W qt () becomes baseband signal;

A digital signal processing module, for two ways of digital signals W i(t) and W qt () carries out Digital Signal Processing, comprise digital low-pass filtering, demodulation, recovers the original transmission signal that transmitting terminal is launched.

Wherein, antenna receiving unit is adaptive array antenna receiving apparatus.

Wherein, amplifier is low noise amplifier.

Wherein, 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, for respectively by useful signal component Z i(t) and Z qt () amplifies and firm power;

A complex bandpass filters, for by useful signal component Z i(t) and Z qt complex signal that () forms carries out filtering, removes useful signal component Z i(t) and Z qnoise in (t), and by filtered useful signal component Z i(t) and Z qt () sends analog to digital converter to respectively.

For realizing goal of the invention, multiband millimeter wave method of reseptance of the present invention, is characterized in that comprising the following steps:

(1), the number of frequency bands of multiband millimeter wave receiver support is designated as X, and each frequency range is expressed as x i, 1≤i≤X, is received the millimeter-wave signal of a certain frequency range, and sends control module to by antenna receiving unit;

(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 sends the control signal of local oscillation signal generation to frequency synthesizer, comprise the local frequency of local oscillation signal f iffor the fixing output IF-FRE that N th harmonic mixer is arranged, 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, then by local oscillation signal L that local oscillation signal is divided into two-way orthogonal by orthocoupler i(t), L q(t);

(3), the signal amplifier of alignment processing circuit amplifies millimeter-wave signal, and by signal X (t) that the millimeter-wave signal after amplifying is divided into two-way identical;

(4), i-th pair of N th harmonic mixer group is respectively to the local oscillation signal L that two-way millimeter-wave signal X (t) is orthogonal with two-way i(t), L qt () carries out quadrature downconvert, obtain two-way intermediate-freuqncy signal and export Y i(t) and Y q(t);

(5), centre frequency f is adopted bPF=f if, filtering bandwidth B bPF> B rFcomplex bandpass filters, B rFfor millimeter-wave signal bandwidth, Y is exported to two-way intermediate-freuqncy signal i(t) and Y qt complex intermediate frequency signal Y (t) that () forms=Y i(t)+jY qt () carries out filtering, complex signal Y (t) can be expressed as wherein for useful signal, for image signal, A represents signal strength signal intensity, ω if=2 π f ifrepresent intermediate-freuqncy signal angular frequency, t represents the time; After complex bandpass filters, positive frequency component pass through, negative frequency component suppressed, obtain two-way useful signal component Z i(t) and Z q(t);

(6), to useful signal component digitlization is carried out, sample frequency and f s>=n × 2B, wherein k and n is respectively positive integer, and B is the baseband signal bandwidth of transmitting terminal information source, and the digital signal obtained after 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 qt () subsequent treatment, comprises digital low-pass filtering, demodulation, recover the original transmission signal of transmitting terminal.

Wherein, local oscillation signal is the orthogonal local oscillation signal of the two-way be divided into is respectively cos2 π f lOt, sin2 π f lOt.

Further, further comprising the steps of: before the digitlization of useful signal component, adopt variable gain amplifier to useful signal component Z i(t) and Z qt () carries out amplification and firm power, then remove the noise in useful signal component by plural bandpass filtering, improves 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, multiple treatment circuit is adopted to use quadrature downconvert frequency conversion to the signal of different frequency range, be fixed the complex intermediate frequency signal of centre frequency, by complex bandpass filters, the image signal as negative frequency components is removed, realize mirror image to suppress, then by analog if signal by analog to digital converter, according to bandpass sample theory, complete and digitizedly realize down-conversion simultaneously, then recover the primary signal of transmitting terminal through subsequent digital signal process.

Multiband millimeter wave receiver of the present invention and method have following beneficial effect:

1., adopt the mixing of N subharmonic, reduce the frequency of local oscillation signal, selecting frequency synthesizer is as local oscillator in addition, controls synthesis corresponding frequencies, has both solved the problem manufacturing and designing difficulty, too increase the flexibility that multiband millimeter-wave signal receives by CPU.

2., General System needs high-quality radio frequency band filter to disinthibite image frequency, and high-quality radio-frequency filter difficult design, and need exponent number high be not easy to integrated, the present invention adopts quadrature downconvert and multiple band pass filter, solve mirror image while realizing millimeter-wave signal frequency conversion and suppress problem, without the need to radio-frequency filter, simplify the design difficulty of system, improve level of integrated system.

3., the present invention adopts the frequency mixer of fixed center frequency, thus can reach analog signal figure by bandpass sampling and make signal down-conversion, obtains required baseband signal, simplifies receiving terminal structure.The mixing of fixed center frequency makes follow-up signal processing circuit of intermediate frequency without the need to changing, cost-saving.

Accompanying drawing explanation

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 downconvert in the present invention;

Fig. 4 is the schematic diagram of plural bandpass filtering in the present invention;

Fig. 5 adopts the present invention's single channel millimeter-wave signal under complex field to receive the spectrum analysis figure of process.

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.Requiring particular attention 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 are described in and will be left in the basket here.

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 mainly comprises multi-frequency band radio-frequency reception matching module, local oscillator module, mirror image harmonic inhabitation frequency mixing module, bandpass sampling down conversion module.

Multi-frequency band radio-frequency receives matching module and comprises:

An antenna receiving unit 1, its frequency reception range covers all frequency range x that multiband millimeter wave receiver is supported i, 1≤i≤X, X is the number of frequency bands that multiband millimeter wave receiver is supported; 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, for the millimeter-wave signal that reception antenna receiving system 1 transmits, the frequency range x belonging to 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 of local oscillation signal generation to frequency synthesizer 3, comprise local frequency f iffor the fixing output IF-FRE that N th harmonic mixer group 7 is arranged, N is the mixing number of times of N th harmonic mixer group 7.

Local oscillator module comprises:

A frequency synthesizer 3, for control signal synthesis local oscillation signal L (t) transmitted according to control module 2, sends orthocoupler 4 to by local oscillation signal.

An orthocoupler 4, for the local oscillation signal L being divided into two-way orthogonal local oscillation signal i(t), L q(t), and send X N th harmonic mixer group 7 respectively to.

Mirror image harmonic inhabitation frequency mixing module comprises:

X signal amplifier 5, for being amplified by the millimeter-wave signal of corresponding frequency band, the reception frequency range of i-th signal amplifier is x i.

In the present embodiment, signal amplifier adopts low noise amplifier (LNA, Low Noise Amplifier).

X signal shunt 6, for the millimeter-wave signal of amplification is divided into identical two-way millimeter-wave signal X (t), sends corresponding N th harmonic mixer group 7 to respectively.

X N th harmonic mixer group 7, for millimeter-wave signal and local oscillation signal are carried out N mixing, N selects according to actual conditions, and the process frequency range of i-th N th harmonic mixer group is x i; Each N th harmonic mixer group comprises:

A N th harmonic mixer 71, for by road millimeter-wave signal X (t) and a road local oscillation signal L it () carries out N mixing, obtain intermediate-freuqncy signal and export Y it () also sends complex bandpass filters (BPF, BandPass Filter) 8 to.

A N th harmonic mixer 72, for by another road millimeter-wave signal X (t) and another road local oscillation signal L qt () carries out N mixing, obtain intermediate-freuqncy signal and export Y qt () also sends complex bandpass filters (BPF) 8 to.

In the present embodiment, N th harmonic mixer 71 and N th harmonic mixer 72 all adopt pipe to formula N subharmonic mixting circuit, and its local oscillator operating frequency is fundamental mixer local oscillator operating frequency mixing times N=4.

A complex bandpass filters (BPF) 8, its centre frequency f bPF=f if, filtering bandwidth B bPF> B rF, B rFfor millimeter-wave signal bandwidth; For exporting Y to intermediate-freuqncy signal i(t) and Y qt complex signal Y (t) that () is combined into=Y i(t)+jY qt () carries 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, for respectively by useful signal component Z i(t) and Z qt () amplifies and firm power.

A complex bandpass filters (BPF) 10, for by useful signal component Z i(t) and Z qt () is combined into a road complex signal and carries out filtering, remove useful signal component Z i(t) and Z qnoise in (t), and by filtered useful signal component Z i(t) and Z qt () sends analog to digital converter (ADC, Analog-to-DigitalConverter) 10 respectively to.

Variable gain amplifier 9 and complex bandpass filters 10 are optional module, and its Main Function is for improving useful signal component Z i(t) and Z qthe signal quality of (t).

Bandpass sampling down conversion module comprises:

Two analog to digital converters (ADC) 10, for respectively to useful signal component Z i(t) and Z qt () carries out bandpass sampling, by useful signal component Z i(t) and Z qt () is converted to two ways of digital signals W i(t) and W q(t), sample frequency and f s>=n × 2B, wherein k and n is respectively positive integer, and B is the baseband signal bandwidth of transmitting terminal information source, realizes signal down-conversion simultaneously, makes digital signal W i(t) and W qt () becomes baseband signal.

A digital signal processing module, for two ways of digital signals W i(t) and W qt () carries out Digital Signal Processing, comprise digital low-pass filtering, demodulation, recovers the original transmission signal that transmitting terminal is launched.

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 comprises the following 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 i, 1≤i≤X, antenna receiving unit receives the millimeter-wave signal of a certain frequency range, and sends control module to.

In the present embodiment, multiband millimeter wave receiver Support center frequency is 40GHz, 50GHz, 60GHz, bandwidth B rFfor three kinds of frequency range millimeter-wave signals of 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 sends the control signal of local oscillation signal generation to frequency synthesizer, comprise the local frequency of local oscillation signal f iffor the fixing output IF-FRE that N th harmonic mixer is arranged, 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, then by local oscillation signal L that local oscillation signal is divided into two-way orthogonal by orthocoupler i(t), L q(t).

Take centre frequency as the millimeter-wave signal of 60GHz bandwidth 300MHz be example, control module receives the millimeter-wave signal transmitted by adaptive array antenna, the local frequency needed for the frequency conversion of first control frequency synthesizer synthesis 60GHz millimeter wave.The present embodiment adopts 4 subharmonic mixing, and the fixing output intermediate frequency 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 , Then gating circuit one, i.e. 60GHz millimeter-wave signal treatment circuit.When millimeter-wave signal is 50GHz, enter circuit two, frequency synthesizer synthesis local frequency is 12.4GHz; When millimeter-wave signal is 40GHz, enter circuit three, frequency synthesizer synthesis local frequency is 9.9GHz.

In the present embodiment, the local oscillation signal adopted is the orthogonal local oscillation signal of the two-way be 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 by millimeter-wave signal signal X (t) that is divided into two-way identical after amplifying.

Adopt low noise amplifier LNA to amplify millimeter-wave signal in the present embodiment, compensate the loss that radiofrequency signal causes in the process of long range propagation, and noise is introduced less.

Step S204: the i-th pair of N th harmonic mixer group is respectively to the local oscillation signal L that two-way millimeter-wave signal X (t) is orthogonal with two-way i(t), L qt () carries out quadrature downconvert, obtain two-way intermediate-freuqncy signal and export Y i(t) and Y q(t).

Fig. 3 is the schematic diagram of quadrature downconvert in the present invention.As shown in Figure 3, in the present embodiment, local oscillation signal is local frequency f lO=14.9GHz, the orthogonal local oscillation signal of two-way is 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 that two-way is orthogonal 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.It can thus be appreciated that realize the compound of millimeter-wave signal and local oscillation signal frequently by quadrature downconvert.

Step S205: adopt centre frequency f bPF=f if, filtering bandwidth B bPF> B rFcomplex bandpass filters, wherein B rFfor millimeter-wave signal bandwidth, Y is exported to two-way intermediate-freuqncy signal i(t) and Y qt complex intermediate frequency signal Y (t) that () forms=Y i(t)+jY qt () carries out filtering, in complex signal Y (t), existing useful signal also has image signal, can be expressed as wherein for useful signal, for image signal, A represents signal strength signal intensity, ω if=2 π f ifrepresent intermediate-freuqncy signal angular frequency, t represents the time; After complex bandpass filters, positive frequency component pass through, negative frequency component suppressed, thus realize the suppression to image signal, obtain two-way useful signal component Z i(t) and Z q(t).

Fig. 4 is the schematic diagram of plural bandpass filtering in the present invention.As shown in Figure 4, the transfer function of complex bandpass filters is wherein S is the multiple parameter of granny rag Lars conversion of low pass filter transfer function, and ω is the angular frequency variable that time domain variable t is corresponding in Fourier transform, and S=j ω, C are the condensances of complex bandpass filters, ω ifrepresent the center angular frequency of complex bandpass filters.Complex intermediate frequency signal Y (t)=Y i(t)+jY qfourier transform frequency response function Y (j the ω)=Y of (t) 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), due to Z ( jω ) = Y ( jω ) H ( jω ) = Y ( jω ) 1 SC - j ω if C , Therefore can obtain: 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.

The design of complex bandpass filters and operation principle can list of references: Qiu Cong. a kind of method for designing [J] of active RC complex filter. and microelectronics and computer, 2009,26(11): 135-138.

Step 206: adopt variable gain amplifier to useful signal component Z i(t) and Z qt () carries out amplification and firm power, then remove the noise in useful signal component by plural bandpass filtering, improves the signal quality of useful signal component.

Step 207: digitlization is carried out to useful signal component, sample frequency and f s>=n × 2B, wherein k and n is respectively positive integer, and B is the baseband signal bandwidth of transmitting terminal information source, and the digital signal obtained after 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 qt () subsequent treatment, comprises digital low-pass filtering, demodulation, recover 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 of process.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 as shown in A point signal spectrum figure, useful signal is because be real signal, so its frequency spectrum is conjugation symmetry, existing positive frequency component also has negative frequency component, its centre frequency and local frequency f lOat a distance of ω if.Image signal is also real signal, and its centre frequency and useful signal are about local oscillator symmetry.

When carrying out real mixing, such as 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 by two impulses of mixing local oscillator conjugation symmetry respectively and cause aliasing.Adopt compound in the present invention frequently, namely adopt as mixing local oscillator, its frequency spectrum is as shown in B point signal spectrum figure, and on frequency spectrum, local frequency place only has single impulse, after carrying out quadrature downconvert, only has 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, useful signal is positive frequency component, and image signal is negative frequency components, and its frequency spectrum, as shown in C point signal spectrum figure, therefore signal aliasing can not occur.

C point signal by complex bandpass filters, by the image signal filtering of negative frequency components, leaves useful signal Z (t) of positive frequency part again, and its frequency spectrum as shown in D point signal spectrum figure, thus realizes mirror image suppression.Because sampling is a kind of process of multiplicative mixing, by input analog signal and cycle impulse signal δ tt () is multiplied realization.Remember that the analog if signal before being input to analog to digital converter is Z (t)=Z i(t)+jZ qt (), then 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, for the sampling period.Sampled output signal is the frequency spectrum of W (t) ω is the angular frequency variable that in sampled signal W (t), time domain variable n is corresponding in Fourier transform, ω s=2 π f sfor sampling angular frequency.From formula, digital signal W (t)=W on frequency spectrum i(t)+jW qt the frequency spectrum of () is the frequency spectrum of D point signal Z (t) with interval ω sleft and right frequency displacement because ω s=2 π f s=2 π f if/ k=ω if/ k, therefore one of them frequency spectrum will move to base band, and its frequency spectrum is as 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, as shown in F point signal spectrum figure, namely realizes the down-conversion of intermediate-freuqncy signal Z (t), again through subsequent digital signal process, the original transmission signal of transmitting terminal just can be recovered.

Although be described the illustrative embodiment of the present invention above; 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 change to limit and in the spirit and scope of the present invention determined, these changes are apparent, and all innovation and creation utilizing the present invention to conceive are all at the row of protection in appended claim.

Claims (9)

1. a multiband millimeter wave receiver, is characterized in that comprising:
An antenna receiving unit (1), its frequency reception range covers all frequency range x that multiband millimeter wave receiver is supported i, 1≤i≤X, X is the number of frequency bands that multiband millimeter wave receiver is supported; For receiving millimeter-wave signal, and millimeter-wave signal is sent to control module (2);
A control module (2), for the millimeter-wave signal that reception antenna receiving system (1) transmits, the frequency range x belonging to 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 rFthe control signal of local oscillation signal generation is sent to frequency synthesizer (3);
A frequency synthesizer (3), for control signal synthesis local oscillation signal L (t) transmitted according to control module (2), sends orthocoupler (4) to by local oscillation signal;
An orthocoupler (4), for the local oscillation signal L being divided into two-way orthogonal local oscillation signal i(t), L q(t), and send X N th harmonic mixer group (7) respectively to;
X signal amplifier (5), for being amplified by the millimeter-wave signal of corresponding frequency band, the reception frequency range of i-th signal amplifier is x i;
X signal shunt (6), for the millimeter wave of amplification is divided into identical two-way millimeter-wave signal X (t), sends corresponding bank of mixers (7) to respectively;
X N th harmonic mixer group (7), for millimeter-wave signal and local oscillation signal are carried out N mixing, the process frequency range of i-th N th harmonic mixer group is x i; Each N th harmonic mixer group comprises:
A N th harmonic mixer (71), for by road millimeter-wave signal X (t) and a road local oscillation signal L it () carries out N mixing, obtain intermediate-freuqncy signal and export Y it () also sends complex bandpass filters (8) to;
A N th harmonic mixer (72), for by another road millimeter-wave signal X (t) and another road local oscillation signal L qt () carries out N mixing, obtain intermediate-freuqncy signal and export Y qt () also sends complex bandpass filters (8) to;
A complex bandpass filters (8), its centre frequency f bPF=f if, f iffor the fixing output IF-FRE that N th harmonic mixer group (7) is arranged, filtering bandwidth B bPF> B rF, B rFfor millimeter-wave signal bandwidth; For exporting Y to intermediate-freuqncy signal i(t) and Y qt complex signal Y (t) that () is combined into=Y i(t)+jY qt () carries 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), for respectively to useful signal component Z i(t) and Z qt () carries out bandpass sampling, by useful signal component Z i(t) and Z qt () is converted to two ways of digital signals W i(t) and W q(t), sample frequency and f s>=n × 2B, wherein k and n is respectively positive integer, and B is the baseband signal bandwidth of transmitting terminal information source, realizes signal down-conversion simultaneously, makes digital signal W i(t) and W qt () becomes baseband signal;
A digital signal processing module (12), for two ways of digital signals W i(t) and W qt () carries out Digital Signal Processing, comprise digital low-pass filtering, demodulation, recovers the signal that transmitting terminal is launched.
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), for respectively by useful signal component Z i(t) and Z qt () amplifies and firm power;
A complex bandpass filters (10), for by useful signal component Z i(t) and Z qt complex signal that () forms carries out filtering, removes useful signal component Z i(t) and Z qnoise in (t).
7. a multiband millimeter wave method of reseptance, is characterized in that comprising the following steps:
(1), the number of frequency bands of multiband millimeter wave receiver support is designated as X, and each frequency range is expressed as x i, 1≤i≤X, is received the millimeter-wave signal of a certain frequency range, and sends control module to by antenna receiving unit;
(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 sends the control signal of local oscillation signal generation to frequency synthesizer, comprise the local frequency of local oscillation signal f iffor the fixing output IF-FRE that N th harmonic mixer is arranged, f rFfor the centre frequency of millimeter-wave signal, 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, then by local oscillation signal L that local oscillation signal is divided into two-way orthogonal by orthocoupler i(t), L q(t);
(3), the signal amplifier of alignment processing circuit amplifies millimeter-wave signal, and by signal X (t) that the millimeter-wave signal after amplifying is divided into two-way identical;
(4), i-th pair of N th harmonic mixer group is respectively to the local oscillation signal L that two-way millimeter-wave signal X (t) is orthogonal with two-way i(t), L qt () carries out quadrature downconvert, obtain two-way intermediate-freuqncy signal and export Y i(t) and Y q(t);
(5), centre frequency f is adopted bPF=f if, filtering bandwidth B bPF> B rFcomplex bandpass filters to two-way intermediate-freuqncy signal export Y i(t) and Y qt complex intermediate frequency signal Y (t) that () forms=Y i(t)+jY qt () carries out filtering, complex signal Y (t) can be expressed as wherein for useful signal, for image signal, ω if=2 π f ifrepresent intermediate-freuqncy signal angular frequency, t represents the time; After complex bandpass filters, positive frequency component pass through, negative frequency component suppressed, obtain two-way useful signal component Z i(t) and Z q(t);
(6), to useful signal component digitlization is carried out, sample frequency and f s>=n × 2B, wherein k and n is respectively positive integer, and B is the baseband signal bandwidth of transmitting terminal information source, and the digitized signal obtained after 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 qt () subsequent treatment, comprises digital low-pass filtering, demodulation, recover the original transmission signal of transmitting terminal.
8. multiband millimeter wave method of reseptance according to claim 7, it is characterized in that, described local oscillation signal is the orthogonal local oscillation signal of the two-way be divided into is respectively cos2 π f lOt, sin2 π f lOt.
9. the multiband millimeter wave method of reseptance according to claim 7 or 8, is characterized in that, further comprising the steps of: before the digitlization of useful signal component, adopts variable gain amplifier to useful signal component Z i(t) and Z qt () carries out amplification and firm power, then remove the noise in useful signal component by plural bandpass filtering.
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