CN100517988C - Radio-frequency receiver and receiving method - Google Patents
Radio-frequency receiver and receiving method Download PDFInfo
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- CN100517988C CN100517988C CNB2005100825804A CN200510082580A CN100517988C CN 100517988 C CN100517988 C CN 100517988C CN B2005100825804 A CNB2005100825804 A CN B2005100825804A CN 200510082580 A CN200510082580 A CN 200510082580A CN 100517988 C CN100517988 C CN 100517988C
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Abstract
The invention comprises: an antenna for receiving RF signals; a low noise amplifier coupled to the antenna and used to amplify the received RF signals; a direct conversion unit coupled to the low nose amplifier and used to make frequency reduction for the RF signals and to generate an in-phase fundamental frequency signal BI and a orthogonal fundamental frequency signal BQ; a first A/D converter coupled to the direct conversion unit for digitalizing the fundamental frequency signal BI in order to get a in-phase digital signal DI; a second A/C converter coupled to the direct conversion unit for digitalizing the orthogonal fundamental frequency signal BQ in order to get a digital orthogonal fundamental frequency signal DQ; a digital frequency boosting unit coupled to the first A/D converter and the second A/D converter for making frequency up-conversion for the DI and DQ in order to generate a IF signal.
Description
Technical field
The present invention relates in radio frequency receiver, particularly relate to the method and apparatus that produces intermediate-freuqncy signal with digital modulation mode.
Background technology
Fig. 1 is the schematic diagram of existing superheterodyne receiver.Antenna 101 receives a radiofrequency signal RF, and process is amplified in low noise amplifier 102.Then first band pass filter 103 filters the unwanted composition among this radiofrequency signal RF, is sent to frequency mixer 104.The frequency of oscillation that this frequency mixer 104 provides according to local oscillator 105, RF carries out mixing to this radiofrequency signal, and generation one comprises the intermediate-freuqncy signal of high-frequency noise, through the filtering of second band pass filter 106, exports pure intermediate-freuqncy signal at last.The frequency of oscillation that this local oscillator 105 provides is that the main key that changes into intermediate-freuqncy signal can fall in this radiofrequency signal RF.Though the existing super-heterodyne architecture of Fig. 1 is quite simple, excellent frequency band and channel-selective is provided, avoid the interference of adjacent frequency bands signal.But the realization of first band pass filter 103 and second band pass filter 106 also is not easy, and needs quality and complicated hardware design quite accurately, and the hanging component mode realizes that cost is not low in addition usually.
Fig. 2 is the schematic diagram of existing zero intermediate frequency receiver (homodyne receiver).The zero intermediate frequency receiver is the receiver architecture that widely adopts at present, can directly direct converting unit 210 be dropped to fundamental frequency.Same antenna 101 has received a radiofrequency signal RF, through the amplification of low noise amplifier 102.Radiofrequency signal RF after the amplification then be transfused to connect always the conversion unit 210, promptly directly export a homophase fundamental frequency signal B
IWith a quadrature baseband signal B
QIn this direct converting unit 210, comprise a local oscillator 105, one homophase frequency demultiplier 202, one quadrature frequency demultipliers, 204, one first low pass filters 206 and one second low pass filters 208.This local oscillator 105 is in order to produce a cosine wave and a sine wave.Wherein the frequency of this w promptly equals the carrier frequency of radiofrequency signal RF.This homophase frequency demultiplier 202 multiply by this cosine wave with the output of low noise amplifier 102, and generation one comprises the homophase fundamental frequency signal B of mirror image noise
IThen, can obtain a pure homophase fundamental frequency signal B through the low-pass filtering treatment of first low pass filter 206
ISimilarly, this quadrature frequency demultiplier 204 multiply by this sine wave with the output of low noise amplifier 102, obtains a quadrature baseband signal B who comprises the mirror image noise
QFiltering mirror image noise in second low pass filter 208 can obtain a pure quadrature baseband signal B
QThough zero intermediate frequency receiver simplicity of design can't be applicable in the demodulation application that needs intermediate-freuqncy signal, based on this structure, must add that still a modulator is modulated to intermediate frequency with fundamental frequency signal.Therefore need a solution that makes the best of both worlds.
Summary of the invention
The invention provides a radio frequency receiver, comprise an antenna, a low noise amplifier connects the conversion unit always, one first analog-digital converter, one second analog-digital converter and a digital raising frequency unit.This antenna receives a radiofrequency signal.This low noise amplifier couples this antenna, amplifies this radiofrequency signal.This direct converting unit couples this low noise amplifier, and this radiofrequency signal is carried out frequency reducing, produces a homophase fundamental frequency signal B
IWith a quadrature baseband signal B
QThis first analog-digital converter couples this direct converting unit, with this homophase fundamental frequency signal B
IDigitlization obtains together phase digital signal D
IThis second analog-digital converter couples this direct converting unit, with this quadrature baseband signal B
QDigitlization obtains a quadrature digital signal D
QThis numeral raising frequency unit couples this first analog-digital converter and this second analog-digital converter, to this in-phase digital signal D
IWith quadrature digital signal D
QCarry out raising frequency, produce an intermediate-freuqncy signal.
This direct converting unit can comprise a local oscillator, a homophase frequency demultiplier, a quadrature frequency demultiplier, one first low pass filter, and one second low pass filter.This local oscillator produces a sinusoidal wave and cosine wave.This homophase frequency demultiplier couples this low noise amplifier and this local oscillator, according to this cosine wave, changes this radiofrequency signal.This quadrature frequency demultiplier couples this low noise amplifier and this local oscillator, according to this sine wave, changes this radiofrequency signal.This homophase frequency demultiplier of this first low pass filter coupled obtains this homophase fundamental frequency signal B after the output low-pass filtering with this homophase frequency demultiplier
IThis quadrature frequency demultiplier of this second low pass filter coupled obtains this quadrature baseband signal B after the output low-pass filtering with this quadrature frequency demultiplier
QWherein should sine wave and the cosine wave frequency can be the carrier frequency of this radiofrequency signal.
This direct converting unit also can be to comprise a local oscillator, a homophase frequency demultiplier, a quadrature frequency demultiplier, and a multiphase filter.This local oscillator produces a sinusoidal wave and cosine wave.This homophase frequency demultiplier couples this low noise amplifier and this local oscillator, according to this cosine wave, changes this radiofrequency signal.This quadrature frequency demultiplier couples this low noise amplifier and this local oscillator, according to this sine wave, changes this radiofrequency signal.This multiphase filter couples this homophase frequency demultiplier and this quadrature frequency demultiplier, obtains this homophase fundamental frequency signal B after the output multiphase filtering with this homophase frequency demultiplier and quadrature frequency demultiplier
IWith this quadrature baseband signal B
QWherein should sine wave and the cosine wave frequency can be the carrier frequency of this radiofrequency signal specific distance that is shifted.
This numeral raising frequency unit can comprise together mutually digital upconverter, an orthogonal digital upconverter, a digital local oscillator, a digital adder and a digital slicer.This numeral local oscillator produces frequency sine-wave among an intermediate frequency cosine wave and.This in-phase digital upconverter couples this numeral local oscillator, receives this in-phase digital signal D
IWith this intermediate frequency cosine wave, export a multiplied result.This orthogonal digital upconverter couples this numeral local oscillator, receives this quadrature digital signal D
QWith frequency sine-wave in this, export its multiplied result.This digital adder couples this in-phase digital upconverter and orthogonal digital upconverter, with the multiplied result addition of this in-phase digital upconverter and the output of orthogonal digital upconverter.This digital slicer couples this digital adder, converts the addition result of this digital adder to intermediate-freuqncy signal.Should middle frequency sine-wave be 10.8 megahertzes wherein, and this intermediate-freuqncy signal be the square wave of a frequency 10.8 megahertzes with this intermediate frequency cosine wave frequency.
This numeral raising frequency unit can comprise one first raising frequency unit, one second raising frequency unit.This first raising frequency unit receives this in-phase digital signal D
IWith this quadrature digital signal D
Q, in compound mixing mode with this in-phase digital signal D
IWith this quadrature digital signal D
QRaising frequency is a homophase low frequency signal D '
IWith a quadrature low frequency signal D '
QThis second raising frequency unit comprises one second local oscillator, one the 5th multiplier, one the 6th multiplier, one the 3rd adder and a digital slicer.This second local oscillator produces one second cosine wave and one second sine wave.The 5th multiplier couples this second local oscillator, receives this homophase low frequency signal D '
IWith this second cosine wave, export this homophase low frequency signal D '
IMultiplied result with this second cosine wave.The 6th multiplier couples this second local oscillator, receives this quadrature low frequency signal D '
QWith this second sine wave, export this quadrature low frequency signal D '
QResult with this second sine wave.The 3rd adder couples the 5th multiplier and the 6th multiplier, with the output results added of the 5th multiplier and the 6th multiplier.This digital slicer couples the 3rd adder, converts the addition result of the 3rd adder to intermediate-freuqncy signal.
This first raising frequency unit can comprise one first local oscillator, one first multiplier, one second multiplier, one the 3rd multiplier, one the 4th multiplier, a first adder, and a second adder.This first local oscillator produces a primary sinusoid and one first cosine wave.This first multiplier couples this first local oscillator, receives this in-phase digital signal D
IWith this first cosine wave, export this in-phase digital signal D
IMultiplied result with this first cosine wave.This second multiplier couples this first local oscillator, receives this in-phase digital signal D
IWith this primary sinusoid, export this in-phase digital signal D
IMultiplied result with this primary sinusoid.The 3rd multiplier couples this first local oscillator, receives this quadrature digital signal D
QWith this primary sinusoid, export this quadrature digital signal D
QMultiplied result with this primary sinusoid.The 4th multiplier couples this first local oscillator, receives this quadrature digital signal D
QWith this first cosine wave, export this quadrature digital signal D
QMultiplied result with this first cosine wave.This first adder couples this first multiplier and the 3rd multiplier, and the output valve of this first multiplier is deducted the output valve of the 3rd multiplier, obtains this homophase low frequency signal D '
IThis second adder couples this second multiplier and the 4th multiplier, and the output valve with output valve addition the 4th multiplier of this second multiplier obtains this quadrature low frequency signal D '
QThis primary sinusoid and this first cosine wave frequency are 1.2 megahertzes, and this second sine wave and this second cosine wave frequency are 9.6 megahertzes.This intermediate-freuqncy signal is the square wave of a frequency 10.8 megahertzes.
Another embodiment of the present invention provides a radio frequency receiving method, is applied to above-mentioned radio frequency receiver.At first, receive a radiofrequency signal, and amplify this radiofrequency signal.Then this radiofrequency signal is carried out frequency reducing, produce a homophase fundamental frequency signal B
IWith a quadrature baseband signal B
QWith this homophase fundamental frequency signal B
IDigitlization obtains together phase digital signal D
I, with this quadrature baseband signal B
QDigitlization obtains a quadrature digital signal D
QAt last, to this in-phase digital signal D
IWith quadrature digital signal D
QCarry out raising frequency, produce an intermediate-freuqncy signal.
Description of drawings
Fig. 1 is the schematic diagram of existing superheterodyne receiver;
Fig. 2 is the schematic diagram of existing zero intermediate frequency receiver;
Fig. 3 a and Fig. 3 b are the embodiment of radio frequency receiver of the present invention;
Fig. 4 is the embodiment of the present invention's numeral raising frequency unit 306;
Fig. 5 is another embodiment of the present invention's numeral raising frequency unit 306; And
Fig. 6 is the flow chart of radio frequency receiving method of the present invention.
The reference numeral explanation
101 antennas, 102 low noise amplifiers
103 first band pass filters, 104 frequency mixers
105 local oscillators, 106 second band pass filters
202 homophase frequency demultipliers, 204 quadrature frequency demultipliers
206 first low pass filters, 208 second low pass filters
210 direct converting unit 220 direct converting units
302 first analog-digital converters, 304 second analog-digital converters
306 digital raising frequency unit, 308 multiphase filters
402 in-phase digital upconverters, 404 orthogonal digital upconverters
406 digital local oscillator 408 digital adders
410 digital slicer
502a ~ 502d first, second and third, multiplier
504 first adders, 506 second adders
508 the 5th multipliers 510 the 6th multiplier
512 the 3rd adders, 514 digital slicer
520 first local oscillators, 530 second local oscillators
560 second raising frequency unit, 550 first raising frequency unit
Embodiment
Fig. 3 a and Fig. 3 b are the embodiment of radio frequency receiver of the present invention.In Fig. 3 a, this antenna 101, low noise amplifier 102 is with directly converting unit 210 is identical with the zero intermediate frequency receiver of Fig. 2.The homophase fundamental frequency signal B that this direct converting unit 210 is exported
IWith quadrature baseband signal B
Q,, change into digital signal in-phase digital signal D further through first analog-digital converter 302 and second analog-digital converter 304
IWith quadrature digital signal D
Q, last, via a digital raising frequency unit 306 with this homophase fundamental frequency signal B
IWith quadrature baseband signal B
QConvert an intermediate-freuqncy signal to.Present embodiment has been quoted zero intermediate frequency (ZIF) structure as the basis, so have good signal of video signal rejection ability.Implementation detail as for this numeral raising frequency unit 306 then describes in detail in Fig. 4 and Fig. 5.
In Fig. 3 b, the direct converting unit 210 of this direct converting unit 220 and Fig. 3 a is slightly different.The frequency that this local oscillator 105 provides is not equal to the carrier frequency of radiofrequency signal RF, has been offset a definite value but set.For instance, the frequency W of radiofrequency signal RF
0Can differ 150 kilo hertzs of (W with the frequency of local oscillator 105
0± 150K), the frequency reducing signal distributions that makes homophase frequency demultiplier 202 and 204 generations of quadrature frequency demultiplier is in the position slightly higher than fundamental frequency.Because avoided the fundamental frequency section, can not need to handle the problem that the image frequency composition causes direct voltage drift (DC Offset).So the structure of Fig. 3 b is called the VLIF structure again, has preferable signal strength signal intensity than Fig. 3 a.Used a multiphase filter 308 (poly phase filter) in this direct converting unit 220, utilized its preferable image frequency thousand to disturb the removal ability, output homophase fundamental frequency signal B
IWith quadrature baseband signal B
QEqually, this first analog-digital converter 302 and second analog-digital converter 304 are with homophase fundamental frequency signal B
IWith quadrature baseband signal B
QDigitlization, output in-phase digital signal D
IWith quadrature digital signal D
Q, convert intermediate-freuqncy signal to through digital raising frequency unit 306.
Fig. 4 is the embodiment of the present invention's numeral raising frequency unit 306.This in-phase digital signal D
IWith quadrature digital signal D
QAfter the input digit raising frequency unit 306, carry out up-conversion by in-phase digital upconverter 402 and orthogonal digital upconverter 404.Wherein this in-phase digital upconverter 402 and orthogonal digital upconverter 404 receive intermediate frequency cosine wave and the middle frequency sine-wave that digital local oscillator 406 produces numeral, output and in-phase digital signal D
IWith quadrature digital signal D
QProduct to a digital adder 408, add up.Then the result who adds up is sent to digital slicer 410 and is converted to intermediate-freuqncy signal.The effect of digital slicer 410 is a kind of quantizers, input signal can be converted to the square wave kenel, and its physical significance is equal to the amplitude limiter (limiter) in the analog signal.
Fig. 5 is another embodiment of the present invention's numeral raising frequency unit 306.This numeral raising frequency unit 306 is with in-phase digital signal D
IWith quadrature digital signal D
QRaising frequency be divided into for two stages.Phase I carries out in the first raising frequency unit 550, and second stage is carried out in the second raising frequency unit 560.Comprise four first multiplier 502a in this first raising frequency unit 550, the second multiplier 502b, the 3rd multiplier 502c, the 4th multiplier 502d, one first local oscillator 520, and a first adder 504 and a second adder 506.This first local oscillator 520 produces a primary sinusoid and one first cosine wave.Wherein the first multiplier 502a is with this in-phase digital signal D
IMultiply by this first cosine wave, the second multiplier 502b is with this in-phase digital signal D
IMultiply by this primary sinusoid, the 3rd multiplier 502c is with this quadrature digital signal D
QMultiply by this primary sinusoid, and the 4th multiplier 502d is with this quadrature digital signal D
QMultiply by this first cosine wave.This first adder 504 couples this first multiplier 502a and the 3rd multiplier 502c, and the output valve of this first multiplier 502a is deducted the output valve of the 3rd multiplier 502c, obtains this homophase low frequency signal D '
IThis second adder 506 couples this second multiplier 502b and the 4th multiplier 502d, and the output valve with output valve addition the 4th multiplier 502d of this second multiplier 502b obtains this quadrature low frequency signal D '
QThe step of being carried out in this first raising frequency unit 550 is called compound mixing (ComplexMixer), and its effect is to be with in-phase digital signal D
IWith quadrature digital signal D
QRaising frequency is exported homophase low frequency signal D ' to 1.2MHz (megahertz)
IWith quadrature low frequency signal D '
QWherein this primary sinusoid and this first cosine wave frequency are 1.2MHz.In the second raising frequency unit 560, carry out the second stage raising frequency subsequently.
In this second raising frequency unit 560, comprise one second local oscillator 530, in order to produce one second cosine wave and one second sine wave.One the 5th multiplier 508 couples this second local oscillator 530, with this homophase low frequency signal D '
IMultiply by second cosine wave.One the 5th multiplier 508 couples this second local oscillator 530, with this quadrature low frequency signal D '
QMultiply by second sine wave.One the 3rd adder 512 couples the 5th multiplier 508 and the 6th multiplier 510, and both multiplied result additions with this then export a digital slicer 514 to.This digital slicer 514 can be an a kind of quantizer (1-Bit Quantizer), is the intermediate-freuqncy signal of square wave in order to produce waveform.In the present embodiment, this second sine wave and this second cosine wave frequency are 9.6 megahertzes, so this intermediate-freuqncy signal is the square wave of a frequency 10.8 megahertzes.The benefit of two-stage raising frequency is, the frequency of second local oscillator 530 can be selected oscillator signal ready-made in the directly employing system 9.6 megahertzes, and frequency 1.2 megahertzes of first local oscillator 520, then can produce by lookup table mode, so generally need be in order not produce 10.8 megahertzes configure hardware in addition, provide cost savings.
Fig. 6 is the flow chart of radio frequency receiving method of the present invention.At first, in step 602, receive a radiofrequency signal RF.In step 604, amplify this radiofrequency signal RF.Step 606, RF carries out frequency reducing to this radiofrequency signal, produces a homophase fundamental frequency signal B
IWith a quadrature baseband signal B
QIn step 608 and step 610, with this homophase fundamental frequency signal B
IWith this quadrature baseband signal B
QDigitlization obtains together phase digital signal D
IWith a quadrature digital signal D
QStep 612 is to this in-phase digital signal D
IWith quadrature digital signal D
QCarry out raising frequency, produce an intermediate-freuqncy signal.Wherein the step that this radiofrequency signal RF is carried out frequency reducing can be to drop to fundamental frequency, also can be the low frequency that drops to a non-zero, for example 150 kilo hertzs.To this in-phase digital signal D
IWith quadrature digital signal D
QCarry out the step of raising frequency, can one time raising frequency to intermediate-freuqncy signal IF, also raising frequency at twice.When for example this intermediate-freuqncy signal IF is the square wave of a frequency 10.8 megahertzes, can be at first raising frequency for the first time to 1.2 megahertzes, raising frequency 9.6 megahertzes more for the second time obtain the intermediate-freuqncy signal IF of 10.8 megahertzes at last.This, raising frequency can be a kind of compound mixing (Complex Mixer) mode first time, directly cancellation image frequency composition.For example first local oscillator 520 by Fig. 5 produces a primary sinusoid and one first cosine wave, again with this in-phase digital signal D
IMultiply each other with this first cosine wave, produce one first digital signal.With this in-phase digital signal D
IMultiply each other with this primary sinusoid, produce one second digital signal.With this quadrature digital signal D
QMultiply each other with this primary sinusoid, produce a three digital signal.With this quadrature digital signal D
QMultiply each other with this first cosine wave, produce one the 4th digital signal.In first adder 504, this first digital signal is deducted this three digital signal at last, obtain this homophase low frequency signal D '
I, in second adder 506,, obtain this quadrature low frequency signal D ' with this second digital signal addition the 4th digital signal
Q
In the present invention, this first and second analog-digital converter must be to have good resolution, eliminates optical mixing process with the image frequency of convenient back segment.Though the analog-digital converter that low intermediate frequency receiver needs must be higher than the resolution of other structure, but the signal that enters this analog-digital converter does not comprise zero-frequency, therefore can come input signal with the AC coupled mode, can save be present in order to solve DC offset problem other system in DC drift eliminator, greatly reduce the complexity of board design, we also lower the complexity that it is regarded as analog circuit so long, and it is married again the digital circuit part.
In addition, eliminate mixing and become the Digital Signal Processing mode owing to be the image frequency of back segment, on behalf of this section image frequency, this eliminate in the optical mixing process, can't produce the error in extra angle or the gain between the orthogonal signalling again.The orthogonal signalling error that front stage circuits produced even can also be by suitable mode general's correction.Thus, the error specification of prime analog circuit just can become the broad pine and design easily.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; those skilled in the art can do some changes and retouching under the premise without departing from the spirit and scope of the present invention, so protection scope of the present invention is as the criterion with claim of the present invention.
Claims (20)
1. a radio frequency receiver comprises:
One antenna is in order to receive a radiofrequency signal;
One low noise amplifier couples this antenna, in order to amplify this radiofrequency signal;
Connect the conversion unit always, couple this low noise amplifier,, produce a homophase fundamental frequency signal (B in order to this radiofrequency signal is carried out frequency reducing
I) and a quadrature baseband signal (B
Q);
One first analog-digital converter couples this direct converting unit, with this homophase fundamental frequency signal (B
I) digitlization, obtain together phase digital signal (D
I);
One second analog-digital converter couples this direct converting unit, with this quadrature baseband signal (B
Q) digitlization, obtain a quadrature digital signal (D
Q); And
One digital raising frequency unit couples this first analog-digital converter and this second analog-digital converter, to this in-phase digital signal (D
I) and quadrature digital signal (D
Q) carry out raising frequency, produce an intermediate-freuqncy signal;
Wherein, this numeral raising frequency unit comprises:
One digital local oscillator is in order to produce frequency sine-wave among an intermediate frequency cosine wave and;
Together mutually digital upconverter couples this numeral local oscillator, receives this in-phase digital signal (D
I) and this intermediate frequency cosine wave, export this in-phase digital signal (D
I) be multiplied by the result of this intermediate frequency cosine wave;
One orthogonal digital upconverter couples this numeral local oscillator, receives this quadrature digital signal (D
Q) and be somebody's turn to do middle frequency sine-wave, export this quadrature digital signal (D
Q) be multiplied by the result of frequency sine-wave in this;
One digital adder couples this in-phase digital upconverter and orthogonal digital upconverter, with the output results added of this in-phase digital upconverter and orthogonal digital upconverter; And
One digital slicer couples this digital adder, converts the addition result of this digital adder to this intermediate-freuqncy signal.
2. radio frequency receiver as claimed in claim 1, wherein this direct converting unit comprises:
One local oscillator is in order to produce a sinusoidal wave and cosine wave;
One homophase frequency demultiplier couples this low noise amplifier and this local oscillator, in order to according to this cosine wave, changes this radiofrequency signal;
One quadrature frequency demultiplier couples this low noise amplifier and this local oscillator, in order to according to this sine wave, changes this radiofrequency signal;
One first low pass filter couples this homophase frequency demultiplier, obtains this homophase fundamental frequency signal (B after the output low-pass filtering with this homophase frequency demultiplier
I); And
One second low pass filter couples this quadrature frequency demultiplier, with after the output low-pass filtering of this quadrature frequency demultiplier to this quadrature baseband signal (B
Q);
Wherein should sine wave and this cosine wave frequency equal the carrier frequency of this radiofrequency signal.
3. radio frequency receiver as claimed in claim 1, wherein this direct converting unit comprises:
One local oscillator is in order to produce a sinusoidal wave and cosine wave;
One homophase frequency demultiplier couples this low noise amplifier and this local oscillator, in order to according to this cosine wave, changes this radiofrequency signal;
One quadrature frequency demultiplier couples this low noise amplifier and this local oscillator, in order to according to this sine wave, changes this radiofrequency signal;
One multiphase filter couples this homophase frequency demultiplier and this quadrature frequency demultiplier, obtains this homophase fundamental frequency signal (B after the output multiphase filtering with this homophase frequency demultiplier and quadrature frequency demultiplier
I) and this quadrature baseband signal (B
Q);
Wherein should sine wave and this cosine wave frequency carrier frequency of equaling this radiofrequency signal specific distance that is shifted.
4. radio frequency receiver as claimed in claim 1 should middle frequency sine-wave be 10.8 megahertzes with this intermediate frequency cosine wave frequency wherein, and this intermediate-freuqncy signal be the square wave of a frequency 10.8 megahertzes.
5. a radio frequency receiver comprises:
One antenna is in order to receive a radiofrequency signal;
One low noise amplifier couples this antenna, in order to amplify this radiofrequency signal;
Connect the conversion unit always, couple this low noise amplifier,, produce a homophase fundamental frequency signal (B in order to this radiofrequency signal is carried out frequency reducing
I) and a quadrature baseband signal (B
Q);
One first analog-digital converter couples this direct converting unit, with this homophase fundamental frequency signal (B
I) digitlization, obtain together phase digital signal (D
I);
One second analog-digital converter couples this direct converting unit, with this quadrature baseband signal (B
Q) digitlization, obtain a quadrature digital signal (D
Q); And
One digital raising frequency unit couples this first analog-digital converter and this second analog-digital converter, to this in-phase digital signal (D
I) and quadrature digital signal (D
Q) carry out raising frequency, produce an intermediate-freuqncy signal; Wherein should comprise numeral raising frequency unit:
One first raising frequency unit receives this in-phase digital signal (D
I) and this quadrature digital signal (D
Q), in compound mixing mode with this in-phase digital signal (D
I) and this quadrature digital signal (D
Q) raising frequency be a homophase low frequency signal (D '
I) and a quadrature low frequency signal (D '
Q);
One second raising frequency unit comprises:
One second local oscillator is in order to produce one second cosine wave and one second sine wave;
One the 5th multiplier couples this second local oscillator, receive this homophase low frequency signal (D '
I) and this second cosine wave, export this homophase low frequency signal (D '
I) and the multiplied result of this second cosine wave;
One the 6th multiplier couples this second local oscillator, receive this quadrature low frequency signal (D '
Q) and this second sine wave, export this quadrature low frequency signal (D '
Q) and the multiplied result of this second sine wave;
One the 3rd adder couples the 5th multiplier and the 6th multiplier, with the output results added of the 5th multiplier and the 6th multiplier; And
One digital slicer couples the 3rd adder, converts the addition result of the 3rd adder to intermediate-freuqncy signal.
6. radio frequency receiver as claimed in claim 5, wherein this first raising frequency unit comprises:
One first local oscillator is in order to produce a primary sinusoid and one first cosine wave;
One first multiplier couples this first local oscillator, receives this in-phase digital signal (D
I) and this first cosine wave, export this in-phase digital signal (D
I) and the multiplied result of this first cosine wave;
One second multiplier couples this first local oscillator, receives this in-phase digital signal (D
I) and this primary sinusoid, export this in-phase digital signal (D
I) and the multiplied result of this primary sinusoid;
One the 3rd multiplier couples this first local oscillator, receives this quadrature digital signal (D
Q) and this primary sinusoid, export this quadrature digital signal (D
Q) and the multiplied result of this primary sinusoid;
One the 4th multiplier couples this first local oscillator, receives this quadrature digital signal (D
Q) and this first cosine wave, export this quadrature digital signal (D
Q) and the multiplied result of this first cosine wave;
One first adder couples this first multiplier and the 3rd multiplier, and the output valve of this first multiplier is deducted the output valve of the 3rd multiplier (502c), obtain this homophase low frequency signal (D '
I); And
One second adder couples this second multiplier and the 4th multiplier, with the output valve of output valve addition the 4th multiplier of this second multiplier, obtain this quadrature low frequency signal (D '
Q).
7. radio frequency receiver as claimed in claim 6, wherein:
This primary sinusoid and this first cosine wave frequency are 1.2 megahertzes;
This second sine wave and this second cosine wave frequency are 9.6 megahertzes; And
This intermediate-freuqncy signal is the square wave of a frequency 10.8 megahertzes.
8. radio frequency receiver as claimed in claim 5, wherein this direct converting unit comprises:
One local oscillator is in order to produce a sinusoidal wave and cosine wave;
One homophase frequency demultiplier couples this low noise amplifier and this local oscillator, in order to according to this cosine wave, changes this radiofrequency signal;
One quadrature frequency demultiplier couples this low noise amplifier and this local oscillator, in order to according to this sine wave, changes this radiofrequency signal;
One first low pass filter couples this homophase frequency demultiplier, obtains this homophase fundamental frequency signal (B after the output low-pass filtering with this homophase frequency demultiplier
I); And
One second low pass filter couples this quadrature frequency demultiplier, with after the output low-pass filtering of this quadrature frequency demultiplier to this quadrature baseband signal (B
Q);
Wherein should sine wave and this cosine wave frequency equal the carrier frequency of this radiofrequency signal.
9. radio frequency receiver as claimed in claim 5, wherein this direct converting unit comprises:
One local oscillator is in order to produce a sinusoidal wave and cosine wave;
One homophase frequency demultiplier couples this low noise amplifier and this local oscillator, in order to according to this cosine wave, changes this radiofrequency signal;
One quadrature frequency demultiplier couples this low noise amplifier and this local oscillator, in order to according to this sine wave, changes this radiofrequency signal;
One multiphase filter couples this homophase frequency demultiplier and this quadrature frequency demultiplier, obtains this homophase fundamental frequency signal (B after the output multiphase filtering with this homophase frequency demultiplier and quadrature frequency demultiplier
I) and this quadrature baseband signal (B
Q);
Wherein should sine wave and this cosine wave frequency carrier frequency of equaling this radiofrequency signal specific distance that is shifted.
10. radio frequency receiver as claimed in claim 5 should middle frequency sine-wave be 10.8 megahertzes with this intermediate frequency cosine wave frequency wherein, and this intermediate-freuqncy signal be the square wave of a frequency 10.8 megahertzes.
11. a radio frequency receiving method comprises:
Receive a radiofrequency signal;
Amplify this radiofrequency signal;
This radiofrequency signal is carried out frequency reducing, produce a homophase fundamental frequency signal (B
I) and a quadrature baseband signal (B
Q);
With this homophase fundamental frequency signal (B
I) and this quadrature baseband signal (B
Q) digitlization, obtain together phase digital signal (D
I) and a quadrature digital signal (D
Q); And
To this in-phase digital signal (D
I) and quadrature digital signal (D
Q) carry out raising frequency, produce an intermediate-freuqncy signal;
Wherein to this in-phase digital signal (D
I) and quadrature digital signal (D
Q) step of carrying out raising frequency comprises:
Produce frequency sine-wave among an intermediate frequency cosine wave and;
With this in-phase digital signal (D
I) be multiplied by this intermediate frequency cosine wave, obtain one first digital signal;
With this quadrature digital signal (D
Q) be multiplied by frequency sine-wave in this, obtain a three digital signal;
With this first digital signal and this three digital signal addition, obtain an addition result; And
This addition result is quantized into the square wave kenel, produces this intermediate-freuqncy signal.
12. radio frequency receiving method as claimed in claim 11 wherein comprises the step that this radiofrequency signal is carried out frequency reducing:
Produce a sinusoidal wave and cosine wave;
This radiofrequency signal be multiply by this cosine wave, obtain together phase product;
This radiofrequency signal be multiply by this sine wave, obtain a quadrature product;
This homophase product is carried out low-pass filtering, stay the fundamental frequency composition, obtain this homophase fundamental frequency signal (B
I); And
This quadrature product is carried out low-pass filtering, stay the fundamental frequency composition, obtain this quadrature baseband signal (B
Q);
Wherein this cosine wave and frequency values that should sine wave equal the carrier frequency of this radiofrequency signal.
13. radio frequency receiving method as claimed in claim 11 wherein comprises the step that this radiofrequency signal is carried out frequency reducing:
Produce a sinusoidal wave and cosine wave, have a first frequency;
This radiofrequency signal be multiply by this cosine wave, obtain together phase product;
This radiofrequency signal be multiply by this sine wave, obtain a quadrature product;
This quadrature product of this homophase sum of products is carried out multiphase filtering, and staying this first frequency is main composition, obtains this homophase fundamental frequency signal (B
I) and this quadrature baseband signal (B
Q);
This first frequency carrier frequency of equaling this radiofrequency signal specific distance that is shifted wherein.
14. radio frequency receiving method as claimed in claim 11 should middle frequency sine-wave be 10.8 megahertzes with this intermediate frequency cosine wave frequency wherein, and this intermediate-freuqncy signal be the square wave of a frequency 10.8 megahertzes.
15. a radio frequency receiving method comprises:
Receive a radiofrequency signal;
Amplify this radiofrequency signal;
This radiofrequency signal is carried out frequency reducing, produce a homophase fundamental frequency signal (B
I) and a quadrature baseband signal (B
Q);
With this homophase fundamental frequency signal (B
I) and this quadrature baseband signal (B
Q) digitlization, obtain together phase digital signal (D
I) and a quadrature digital signal (D
Q); And
To this in-phase digital signal (D
I) and quadrature digital signal (D
Q) carry out raising frequency, produce an intermediate-freuqncy signal;
Wherein to this in-phase digital signal (D
I) and quadrature digital signal (D
Q) step of carrying out raising frequency comprises:
In compound mixing mode with this in-phase digital signal (D
I) and this quadrature digital signal (D
Q) raising frequency be a homophase low frequency signal (D '
I) and a quadrature low frequency signal (D '
Q);
Produce one second cosine wave and one second sine wave;
With this homophase low frequency signal (D '
I) and this second cosine wave multiply each other, obtain one first result;
With this quadrature low frequency signal (D '
Q) and this second sine wave multiply each other, obtain one second result;
With this first result and this second results added; And
This addition result is quantized into the square wave kenel, produces this intermediate-freuqncy signal.
16. radio frequency receiving method as claimed in claim 15 wherein should comprise with the step of compound mixing mode raising frequency:
Produce a primary sinusoid and one first cosine wave;
With this in-phase digital signal (D
I) and this first cosine wave multiply each other, produce one first digital signal;
With this in-phase digital signal (D
I) and this primary sinusoid multiply each other, produce one second digital signal;
With this quadrature digital signal (D
Q) and this primary sinusoid multiply each other, produce a three digital signal;
With this quadrature digital signal (D
Q) and this first cosine wave multiply each other, produce one the 4th digital signal;
This first digital signal is deducted this three digital signal, obtain this homophase low frequency signal (D '
I);
With with this second digital signal addition the 4th digital signal, obtain this quadrature low frequency signal (D '
Q).
17. radio frequency receiving method as claimed in claim 16, wherein:
This primary sinusoid and this first cosine wave frequency are 1.2 megahertzes;
This second sine wave and this second cosine wave frequency are 9.6 megahertzes; And
This intermediate-freuqncy signal is the square wave of a frequency 10.8 megahertzes.
18. radio frequency receiving method as claimed in claim 15 wherein comprises the step that this radiofrequency signal is carried out frequency reducing:
Produce a sinusoidal wave and cosine wave;
This radiofrequency signal be multiply by this cosine wave, obtain together phase product;
This radiofrequency signal be multiply by this sine wave, obtain a quadrature product;
This homophase product is carried out low-pass filtering, stay the fundamental frequency composition, obtain this homophase fundamental frequency signal (B
I); And
This quadrature product is carried out low-pass filtering, stay the fundamental frequency composition, obtain this quadrature baseband signal (B
Q);
Wherein this cosine wave and frequency values that should sine wave equal the carrier frequency of this radiofrequency signal.
19. radio frequency receiving method as claimed in claim 15 wherein comprises the step that this radiofrequency signal is carried out frequency reducing:
Produce a sinusoidal wave and cosine wave, have a first frequency;
This radiofrequency signal be multiply by this cosine wave, obtain together phase product;
This radiofrequency signal be multiply by this sine wave, obtain a quadrature product;
This quadrature product of this homophase sum of products is carried out multiphase filtering, and staying this first frequency is main composition, obtains this homophase fundamental frequency signal (B
I) and this quadrature baseband signal (B
Q);
This first frequency carrier frequency of equaling this radiofrequency signal specific distance that is shifted wherein.
20. radio frequency receiving method as claimed in claim 15 should middle frequency sine-wave be 10.8 megahertzes with this intermediate frequency cosine wave frequency wherein, and this intermediate-freuqncy signal be the square wave of a frequency 10.8 megahertzes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100825804A CN100517988C (en) | 2005-07-11 | 2005-07-11 | Radio-frequency receiver and receiving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100825804A CN100517988C (en) | 2005-07-11 | 2005-07-11 | Radio-frequency receiver and receiving method |
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| Publication Number | Publication Date |
|---|---|
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| CN100517988C true CN100517988C (en) | 2009-07-22 |
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ID=37609869
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100825804A Active CN100517988C (en) | 2005-07-11 | 2005-07-11 | Radio-frequency receiver and receiving method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857175A (en) * | 2011-06-28 | 2013-01-02 | 联咏科技股份有限公司 | Frame structure supporting zero intermediate frequency/low intermediate frequency/intermediate frequency system and method |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8929848B2 (en) | 2008-12-31 | 2015-01-06 | Mediatek Singapore Pte. Ltd. | Interference-robust receiver for a wireless communication system |
| TW201112650A (en) * | 2009-09-18 | 2011-04-01 | Mediatek Singapore Pte Ltd | Amplifier and receiver for a wireless communication system |
| CN102983813B (en) * | 2012-10-30 | 2016-08-03 | 英特尔公司 | Frequency mixer |
| US10317535B2 (en) * | 2016-03-31 | 2019-06-11 | Samsung Electronics Co., Ltd | Method and apparatus for second order intercept point (IP2) calibration |
| CN108896980B (en) * | 2018-04-09 | 2022-06-21 | 飞依诺科技股份有限公司 | Method and device for generating RF data based on IQ data |
| CN113225094B (en) * | 2020-01-21 | 2022-03-25 | 瑞昱半导体股份有限公司 | Radio frequency interference estimation device, signal processing device and signal processing method |
| CN114024563A (en) * | 2021-11-04 | 2022-02-08 | 中徽建技术有限公司 | Front-end circuit for ultra-wideband radio frequency receiver |
-
2005
- 2005-07-11 CN CNB2005100825804A patent/CN100517988C/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857175A (en) * | 2011-06-28 | 2013-01-02 | 联咏科技股份有限公司 | Frame structure supporting zero intermediate frequency/low intermediate frequency/intermediate frequency system and method |
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| Publication number | Publication date |
|---|---|
| CN1897468A (en) | 2007-01-17 |
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