CN202488730U - Frequency shift machine near-far end carrier synchronizer - Google Patents
Frequency shift machine near-far end carrier synchronizer Download PDFInfo
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- CN202488730U CN202488730U CN2012201282232U CN201220128223U CN202488730U CN 202488730 U CN202488730 U CN 202488730U CN 2012201282232 U CN2012201282232 U CN 2012201282232U CN 201220128223 U CN201220128223 U CN 201220128223U CN 202488730 U CN202488730 U CN 202488730U
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Abstract
The utility model relates to a frequency shift machine near-far end carrier synchronizer which comprises a near-end machine and a far-end machine, wherein the near-end machine at least comprises a first local oscillator, a second local oscillator, a first crystal oscillator, a first clock chip, a first AD (active directory) analog-to-digital conversion unit, a first DDC (direct digital control) digital lower conversion unit, a first DUC (digital up converter) digital upper conversion unit, a first DA (digital audio) digital-to-analog conversion unit and a carrier signal plug-in unit; and the far end machine at least comprises a third local oscillator, a fourth local oscillator, a second crystal oscillator, a second clock chip, a second AD analog-to-digital conversion unit, a second DDC digital lower conversion unit, a second DUC digital upper conversion unit, a second DA digital-to-analog conversion unit and a frequency offset measuring and compensation unit. The frequency shift machine near-far end carrier synchronizer provided by the utility model is applied to the carrier synchronization of a frequency shift machine near-far end.
Description
Technical field
The utility model relates to the shift frequency machine, is specifically related to the nearly far-end carrier synchronization of shift frequency machine.
Background technology
For the self-excitation that overcomes intra-frequency repeater and the problem that can not omnidirectional covers; Frequency-shift repeater is widely used; Its basic principle is that the network signal with a certain frequency range upconverts to other frequency ranges at near-end through frequency converter, and processing and amplifying utilizes the antenna with frequency range to receive after antenna is launched at far-end again; Handle the back and return former frequency range, with omnidirectional or directional antenna the target area is covered again through the frequency converter down-conversion.The processing of upward signal then in contrast.Said process often uses the shift frequency machine to realize, what wherein realize the far-end function is remote termination, and what realize the near-end function is the near-end machine.
Shown in the remote termination sketch map of the near-end machine of Fig. 1 a and Fig. 1 b; In the near-end machine; The numerical portion of delivering to circuit after the frequency of oscillation that radiofrequency signal RF0 and first crystal oscillator produce is mixed through first local oscillator carries out the filtered signal of frequency conversion and is mixed into signal RF1 through second local oscillator; Transfer to remote termination, wherein numerical portion comprises an AD AD conversion unit, a DDC Digital Down Convert unit, a DUC Digital Up Convert unit, a DA D/A conversion unit.
In the remote termination, the radiofrequency signal RF1 that receives
'Carry out the filtered signal of frequency conversion with the numerical portion of delivering to circuit after the frequency of oscillation that second crystal oscillator produces is mixed through the 3rd local oscillator and be mixed into signal RF0 through the 4th local oscillator
', wherein numerical portion comprises the 2nd AD AD conversion unit, the 2nd DDC Digital Down Convert unit, the 2nd DUC Digital Up Convert unit, the 2nd DA D/A conversion unit.
In the said process, in the ideal case, the RF1 that remote termination receives
'The frequency of the RF1 that sends out of frequency and near-end machine, and the RF0 that sends out of remote termination
'The frequency of the RF0 that receives of frequency and near-end machine be identical, RF1 in the reality
'Frequency be identical with the frequency of RF1, but RF0
'Frequency be different with the frequency of RF0, this is because the equal factor of the accuracy of oscillator and nearly far-end crystal oscillator causes the local oscillator frequency deviation, makes numerical portion can't reach zero intermediate frequency, has had a strong impact on the performance of demodulator.Therefore the carrier synchronization of remote termination and near-end machine is very important.
The utility model content
The utility model technical problem to be solved is the nearly far-end carrier synchronization of a kind of shift frequency machine device to be provided, the problem that can't reach zero intermediate frequency described in the solution background technology.
In order to solve the problems of the technologies described above, the nearly far-end carrier synchronization of a kind of shift frequency machine of the utility model device comprises near-end machine and remote termination;
Said near-end machine comprises first local oscillator, second local oscillator, first crystal oscillator, first clock chip, an AD AD conversion unit, a DDC Digital Down Convert unit, a DUC Digital Up Convert unit, a DA D/A conversion unit and carrier signal insertion unit at least;
Said remote termination comprises the 3rd local oscillator, the 4th local oscillator, second crystal oscillator, second clock chip, the 2nd AD AD conversion unit, the 2nd DDC Digital Down Convert unit, the 2nd DUC Digital Up Convert unit, the 2nd DA D/A conversion unit and frequency deviation measurement and compensating unit at least;
The output of said carrier signal insertion unit is electrically connected on the input of a DUC Digital Up Convert unit; Said first crystal oscillator and first clock chip are that first local oscillator, second local oscillator, an AD AD conversion unit, a DDC Digital Down Convert unit, a DUC Digital Up Convert unit and a DA D/A conversion unit provide clock frequency, and armed radio frequency signal frequency and clock frequency transfer to behind the AD AD conversion unit respectively via a DDC Digital Down Convert unit and a DUC Digital Up Convert unit to a DA D/A conversion unit after by exporting remote termination to after second local oscillator through first local oscillator of near-end machine;
The output of said frequency deviation measurement and compensating unit is electrically connected on the input of the 2nd DDC Digital Down Convert unit and the input of the 2nd DUC Digital Up Convert unit; Said second crystal oscillator and second clock chip are that the 3rd local oscillator, the 4th local oscillator, the 2nd AD AD conversion unit, the 2nd DDC Digital Down Convert unit, the 2nd DUC Digital Up Convert unit and the 2nd DA D/A conversion unit provide clock frequency, and the radio frequency signal frequency that remote termination receives and clock frequency transfer to behind the 2nd AD AD conversion unit respectively via the 2nd DDC Digital Down Convert unit and the 2nd DUC Digital Up Convert unit to the two DA D/A conversion units after by exporting the near-end machine after the 4th local oscillator to through the 3rd local oscillator of remote termination.
Further, said first local oscillator, second local oscillator, the 3rd local oscillator and the 4th local oscillator are low local oscillators.
Further, said carrier signal is inserted the unit and is included in the device that inserts a carrier signal before the DUC Digital Up Convert of near-end machine at least, and this carrier signal is the sinusoidal wave digital signal of I=c, Q=0, wherein 0≤c≤0.5.
Wherein, Carrier signal is inserted the unit: owing to insert the single-tone carrier wave of an I=c, Q=0 (0≤c≤0.5); So the single-tone carrier wave need take a frequency, this frequency must not influence the transmission of other carrier waves, so can the right of this frequency insertion useful signal be transmitted.
Frequency deviation measurement and compensating unit: need to prove the multiple that tone signal the 2nd DDC Digital Down Convert unit extracts, the multiple that extracts in theory is many more, and algorithm accuracy is good more, yet the frequency deviation region that can measure is more little.
The utility model adopts said structure, has the following advantages:
1. the utility model inserted a carrier signal before the DUC of near-end machine Digital Up Convert; Is frequency RF0 identical frequency with the radiofrequency signal of near-end machine reception through calculating frequency deviation and compensate of frequency deviation with said carrier signal shift frequency at remote termination; Thereby solved the problem that can't reach zero intermediate frequency described in the background technology; Realize the carrier synchronization of nearly far-end, improved the performance of demodulator;
2. the carrier signal of the utility model insertion before the DUC of near-end machine Digital Up Convert is the sinusoidal wave digital signal of I=c, Q=0 (0≤c≤0.5), is simple and easy to realize.
Description of drawings
Fig. 1 a is the near-end machine of the shift frequency machine of the prior art in the background technology.
Fig. 1 b is the remote termination of the shift frequency machine of the prior art in the background technology.
Fig. 2 a is the near-end machine sketch map in the nearly far-end carrier synchronization of the shift frequency machine device of the utility model.
Fig. 2 b is the remote termination sketch map in the nearly far-end carrier synchronization of the shift frequency machine device of the utility model.
Embodiment
Combine accompanying drawing and embodiment that the utility model is further specified at present.
Brief account I, the Q signal used of the utility model once at first: communication the earliest is an analog communication, supposes that carrier wave is cos (a), and signal is cos (b), so through the frequency spectrum shift that coordinates, has just obtained:
cos(a)*cos(b)=?1/2[cos(a+b)-cos(a-b)]
Under a carrier wave, produced two signals like this, a+b and a-b, and, only need a signal to get final product in fact for transmission, and that is to say that both select one to get final product, another one is useless, need filter.But practice filters is unfavorable, is difficult to filter fully another one, so because a lot of band resources have been wasted in the existence of another one frequency band.
After getting into digital Age, the signal frequency of having only in some moment transmission such as 0, is assumed to be 900MHz, and 1 is assumed to be 901MHz, and these two frequencies are changing always, and can not occur simultaneously.This is different from the analog communication signal, and such as television set, the frequency band of signal is exactly 6.5MHz.Also having a serious problem, is exactly that the signal band resource is more and more valuable, can not cause double-sideband signal again as so simple carrier wave of simulation and signal multiplication.
Everybody hopes to obtain most, imports a signal and b signal exactly, obtains single a+b or a-b and gets final product.Based on this purpose, we just launch this formula:
cos(a－b)＝cos(a)cos(b)＋sin(a)sin(b)
This formula clearly shows, as long as multiply each other carrier wave a and signal b, afterwards they separately all phase shift 90 spend and multiply each other, addition afterwards just can obtain the signal of a-b.This is in digital communication, and current semiconductor technology can be accomplished fully: 1. digital communication, the single time has only a frequency, so can phase shift 90 degree.2. adder, multiplier technology are easy to realize.
Because I is exactly cos (b), Q is exactly sin (b), and these two signals are made up:
cos(b), sin(b)
cos(b),?-sin(b)
-cos(b), sin(b)
-cos(b), -sin(b)
This is exactly that four of IQ signal has been modulated mutually.
Following mask body is set forth the scheme of the utility model; The thinking of the utility model is in the near-end machine, to insert a carrier signal; This carrier signal is the sinusoidal wave digital signal of I=c, Q=0 (0≤c≤0.5); Be tone signal and since tone signal shift frequency when being absolute zero intermediate frequency signals I be constant with Q, so insert the carrier signal of an I=c, Q=0 (0≤c≤0.5) before in the DUC Digital Up Convert; Be the intermediate-freuqncy signal that will transmit of institute through the DUC Digital Up Convert, being positioned at needs to transmit the most right-hand of carrier wave.Is zero intermediate frequency at remote termination with the tone signal shift frequency that inserts; Owing to there is frequency deviation; So can be through the frequency values of tone signal behind the calculating shift frequency; This frequency values is the frequency deviation that near-end machine local oscillator two and remote termination local oscillator one are produced, and again through compensating for frequency offset, makes the frequency RF0 of the radiofrequency signal that the near-end machine receives and the frequency RF0 of the radiofrequency signal of remote termination transmission
'Identical.
Concrete; Shown in Fig. 2 a and Fig. 2 b; The nearly far-end carrier synchronization of a kind of shift frequency machine of the utility model device; Comprise near-end machine and remote termination; The near-end machine comprises that at least first local oscillator 101, second local oscillator 102, first crystal oscillator 103, first clock chip 104, an AD AD conversion unit 105, a DDC Digital Down Convert unit 106, a DUC Digital Up Convert unit 107, a DA D/A conversion unit 108 and carrier signal insert unit 109; Said first crystal oscillator 103 and first clock chip 104 are that first local oscillator 101, second local oscillator 102, an AD AD conversion unit 105, a DDC Digital Down Convert unit 106, a DUC Digital Up Convert unit 107, a DA D/A conversion unit 108 and carrier signal are inserted unit 109 accurate clock frequency is provided; Said first local oscillator 101, an AD AD conversion unit 105, a DDC Digital Down Convert unit 106, a DUC Digital Up Convert unit 107, a DA D/A conversion unit 108 and second local oscillator 102 are connected in series; The output of said carrier signal insertion unit 109 is electrically connected on the input of a DUC Digital Up Convert unit 107; Armed radio frequency signal frequency RF0 and the clock frequency that produced by first crystal oscillator 103 and first clock chip 104 transfer to a DDC Digital Down Convert unit 106 after transferring to an AD AD conversion unit 105 through first local oscillator 101 of near-end machine again; The carrier signal that the signal of output inserts unit 109 with carrier signal transfers to a DUC Digital Up Convert unit 107, the signal of output via a DA D/A conversion unit 108 after again via output radio frequency signal frequency RF1 after second local oscillator to remote termination; Said carrier signal is inserted unit 109 and is included in the device that inserts a carrier signal before the DUC Digital Up Convert of near-end machine at least, and this carrier signal is the sinusoidal wave digital signal of I=c, Q=0, wherein 0≤c≤0.5;
Remote termination comprises the 3rd local oscillator 201, the 4th local oscillator 202, second crystal oscillator 203, second clock chip 204, the 2nd AD AD conversion unit 205, the 2nd DDC Digital Down Convert unit 206, the 2nd DUC Digital Up Convert unit 207, the 2nd DA D/A conversion unit 208 and frequency deviation measurement and compensating unit 209 at least; Said second crystal oscillator 203 and second clock chip 204 are that the 3rd local oscillator 201, the 4th local oscillator 202, the 2nd AD AD conversion unit 205, the 2nd DDC Digital Down Convert unit 206, the 2nd DUC Digital Up Convert unit 207, the 2nd DA D/A conversion unit 208 and frequency deviation measurement and compensating unit 209 provide clock frequency; Said the 3rd local oscillator 201, the 2nd AD AD conversion unit 205, the 2nd DDC Digital Down Convert unit 206, the 2nd DUC Digital Up Convert unit 207, the 2nd DA D/A conversion unit 208 and the 4th local oscillator 202 are connected in series the radio frequency signal frequency RF1 that remote termination receives
'Transfer to the 2nd DDC Digital Down Convert unit 206 after transferring to the 2nd AD AD conversion unit 205 with the clock frequency that produces by second crystal oscillator 203 and second clock chip 204 through the 3rd local oscillator 201 of remote termination; The signal of output and frequency deviation measurement transfer to the 2nd DUC Digital Up Convert unit 207 with the compensating signal of compensating unit 209, and the signal of output and frequency deviation measurement transfer to the 2nd DA D/A conversion unit 208 after by the 4th local oscillator 202 back output radio frequency signal frequency RF0 with the compensating signal of compensating unit 209
'To the near-end machine; Wherein, Frequency deviation measurement and 209 pairs the 2nd DDC Digital Down Converts of compensating unit unit 206 and the 2nd DUC Digital Up Convert unit 207 are controlled; Specifically be that the DDS Direct Digital Synthesizer of the 2nd DDC Digital Down Convert unit 206 and the 2nd DUC Digital Up Convert unit 207 is controlled, said frequency deviation measurement and compensating unit 209 are used to calculate the frequency deviation value of near-end machine and remote termination
With the compensate of frequency deviation value
With said carrier signal shift frequency to be the frequency RF0 frequency much at one of the radiofrequency signal of near-end machine reception.
Further, said first local oscillator, second local oscillator, the 3rd local oscillator and the 4th local oscillator are low local oscillators.
In the said structure; Carrier signal is inserted unit 109: owing to insert the single-tone carrier wave of an I=c, Q=0 (0≤c≤0.5); So the single-tone carrier wave need take a frequency, this frequency must not influence the transmission of other carrier waves, so can the right of this frequency insertion useful signal be transmitted.
Frequency deviation measurement and compensating unit 209: need to prove the multiple that tone signal the 2nd DDC Digital Down Convert unit 206 extracts, the multiple that extracts in theory is many more, and algorithm accuracy is good more, yet the frequency deviation region that can measure is more little.
Experimental result shows, frequency and the compensating for frequency offset that the utility model can calculate frequency deviation makes that the RF spot of input of near-end machine is almost consistent with the RF spot of remote termination output.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; But the those skilled in the art should be understood that; In the spirit and scope of the utility model that does not break away from appended claims and limited; Can make various variations to the utility model in form with on the details, be the protection range of the utility model.
Claims (3)
1. the nearly far-end carrier synchronization of a shift frequency machine device is characterized in that: comprise near-end machine and remote termination;
Said near-end machine comprises first local oscillator, second local oscillator, first crystal oscillator, first clock chip, an AD AD conversion unit, a DDC Digital Down Convert unit, a DUC Digital Up Convert unit, a DA D/A conversion unit and carrier signal insertion unit at least;
Said remote termination comprises the 3rd local oscillator, the 4th local oscillator, second crystal oscillator, second clock chip, the 2nd AD AD conversion unit, the 2nd DDC Digital Down Convert unit, the 2nd DUC Digital Up Convert unit, the 2nd DA D/A conversion unit and frequency deviation measurement and compensating unit at least;
The output of said carrier signal insertion unit is electrically connected on the input of a DUC Digital Up Convert unit; Said first crystal oscillator and first clock chip are that first local oscillator, second local oscillator, an AD AD conversion unit, a DDC Digital Down Convert unit, a DUC Digital Up Convert unit and a DA D/A conversion unit provide clock frequency, and armed radio frequency signal frequency and clock frequency transfer to behind the AD AD conversion unit respectively via a DDC Digital Down Convert unit and a DUC Digital Up Convert unit to a DA D/A conversion unit after by exporting remote termination to after second local oscillator through first local oscillator of near-end machine;
The output of said frequency deviation measurement and compensating unit is electrically connected on the input of the 2nd DDC Digital Down Convert unit and the input of the 2nd DUC Digital Up Convert unit; Said second crystal oscillator and second clock chip are that the 3rd local oscillator, the 4th local oscillator, the 2nd AD AD conversion unit, the 2nd DDC Digital Down Convert unit, the 2nd DUC Digital Up Convert unit and the 2nd DA D/A conversion unit provide clock frequency, and the radio frequency signal frequency that remote termination receives and clock frequency transfer to behind the 2nd AD AD conversion unit respectively via the 2nd DDC Digital Down Convert unit and the 2nd DUC Digital Up Convert unit to the two DA D/A conversion units after by exporting the near-end machine after the 4th local oscillator to through the 3rd local oscillator of remote termination.
2. the nearly far-end carrier synchronization of shift frequency machine according to claim 1 device is characterized in that: said first local oscillator, second local oscillator, the 3rd local oscillator and the 4th local oscillator are low local oscillators.
3. the nearly far-end carrier synchronization of shift frequency machine according to claim 1 device; It is characterized in that: said carrier signal is inserted the unit and is included in the device that inserts a carrier signal before the DUC Digital Up Convert of near-end machine at least; This carrier signal is the sinusoidal wave digital signal of I=c, Q=0, wherein 0≤c≤0.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201282232U CN202488730U (en) | 2012-03-30 | 2012-03-30 | Frequency shift machine near-far end carrier synchronizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201282232U CN202488730U (en) | 2012-03-30 | 2012-03-30 | Frequency shift machine near-far end carrier synchronizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202488730U true CN202488730U (en) | 2012-10-10 |
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ID=46963113
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201282232U Expired - Fee Related CN202488730U (en) | 2012-03-30 | 2012-03-30 | Frequency shift machine near-far end carrier synchronizer |
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| Country | Link |
|---|---|
| CN (1) | CN202488730U (en) |
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2012
- 2012-03-30 CN CN2012201282232U patent/CN202488730U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121010 Termination date: 20170330 |