CN102594766A - Method and device for near-far end carrier synchronization of frequency shift machine - Google Patents
Method and device for near-far end carrier synchronization of frequency shift machine Download PDFInfo
- Publication number
- CN102594766A CN102594766A CN2012100897821A CN201210089782A CN102594766A CN 102594766 A CN102594766 A CN 102594766A CN 2012100897821 A CN2012100897821 A CN 2012100897821A CN 201210089782 A CN201210089782 A CN 201210089782A CN 102594766 A CN102594766 A CN 102594766A
- Authority
- CN
- China
- Prior art keywords
- frequency
- digital
- unit
- signal
- end machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Transceivers (AREA)
Abstract
The invention relates to a frequency shift machine, in particular to near-far end carrier synchronization of the frequency shift machine. A method for the near-far end carrier synchronization of the frequency shift machine includes the following steps: step 1 a carrier signal is inserted before digital up conversion (DUC) of a near-end machine, and the carrier signal is a sine wave digital signal with I = c and Q = 0, wherein 0 <= c <= 0.5; step 2 the carrier signal is shifted in frequency to a frequency point which is almost the same as frequency RF0 of a radio frequency signal received by the near-end machine on a far-end machine through calculation of frequency deviation value and frequency deviation compensation value of the near-end machine and the far-end machine, through special formula: wherein the RF0 is the frequency of the radio frequency signal received by the near-end machine, the RF1 is frequency of a radio frequency signal sent by the near-end machine, and frequency deviation compensation is performed according to the formula so as to enable the frequency RF0 of the radio frequency signal received by the near-end machine to be the same as frequency RF0' of a radio frequency signal sent by the far-end machine. The method and the device are applied to the near-far end carrier synchronization of the frequency shift machine.
Description
Technical field
The present invention relates to the shift frequency machine, be 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.
Summary of the invention
Technical problem to be solved by this invention is nearly far-end carrier synchronization method of a kind of shift frequency machine and 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 method of a kind of shift frequency machine of the present invention may further comprise the steps:
Step 1: before the DUC of near-end machine Digital Up Convert, insert a carrier signal, this carrier signal is the sinusoidal wave digital signal of I=c, Q=0, wherein greater than 0≤c≤0.5;
Step 2: is and the frequency RF0 frequency much at one of the radiofrequency signal of near-end machine reception specifically to pass through formula in frequency deviation value
and the compensate of frequency deviation value
of remote termination through calculating near-end machine and remote termination with said carrier signal shift frequency:
; Wherein RF0 is the frequency of the radiofrequency signal of near-end machine reception; RF1 is the frequency of the radiofrequency signal of near-end machine transmission
Carry out compensate of frequency deviation according to following formula, make 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.
Further, the value of the c in the step 1 is relevant with the gain of circuit board, preferred c=0.15.
Further, before the DUC of near-end machine Digital Up Convert, insert a carrier signal in the step 1, said carrier signal goes out a channel separately and places the right of useful signal to transmit.
Further; Calculate the frequency deviation
of near-end machine and remote termination in the step 2; Specifically calculate frequency deviation through the Fitz algorithm, the formula of Fitz algorithm is following:
In the following formula, P, N get natural number, because the tone signal modulation index is 1; So P of the present invention gets 1, N is relevant with estimated accuracy, within the specific limits; N is big more, means that the data association is tight more in taking into account apart from correlation far away more; It is accurate more to estimate, but because the existence of noise can not rely on the unlimited N of increasing to improve estimated accuracy; T is the time, i.e. the inverse of the sampling rate after the down-conversion, and the more little performance of T is good more in theory, but when frequency deviation was big, T just can not be too little; R (m) is the auto-correlation of the carrier signal z (k) that is inserted into, and R (m) is provided by following formula:
Above-mentioned formula is applicable to the single computing; So make
; 0 < μ < 1; Approach actual frequency deviation value through recursive mode, can better adapt to this system (opposing deep fade) like this.The μ value is more little in addition, and the time that reaches accurate frequency values is long more, but dysfunctional is good more, and vice versa, so μ need appropriately to select.Preferably, the μ value is 0.05 among the present invention.
In order to adapt to the simple in structure suitable computing principle of FPGA, the L in the above-mentioned formula
0Value be 2
n, make L
0=L-m, the definition of substitution R (m):
，
Through revising L
0Value touch the mark.Preferably, L
0Value be 32.
Further, the compensate of frequency deviation in the step 2 specifically: through calculating
Obtain offset and compensate digital frequency synthesizer DDS, make useful carrier frequency reach zero intermediate frequency, through calculating to the DDC Digital Down Convert
Obtain offset and compensate digital frequency synthesizer DDS, make 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 to the DUC Digital Up Convert
'Identical.
A kind of nearly far-end carrier synchronization of shift frequency machine device of using said method; Comprise near-end machine and remote termination; The 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 and a DA D/A conversion unit at least; 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 and the 2nd DA D/A conversion unit at least; 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; 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; In addition; The near-end machine also comprises carrier signal insertion unit; The output of said carrier signal insertion unit is electrically connected on the input of a DUC Digital Up Convert unit; Remote termination also comprises frequency deviation measurement and compensating unit, and 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 first local oscillator, second local oscillator, the 3rd local oscillator and the 4th local oscillator are low local oscillators.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; 0≤c≤0.5 wherein; Said frequency deviation measurement and compensating unit comprise the calculation element that calculates near-end machine and the frequency deviation value
of remote termination, the calculation element that calculates compensate of frequency deviation value
at least, and according to the result of calculation of the calculation element of calculation element that calculates near-end machine and the frequency deviation value
of remote termination and calculating compensate of frequency deviation value
and with the said carrier signal shift frequency compensation arrangement that is zero intermediate frequency;
The calculation element of said calculating compensate of frequency deviation value
is according to computes compensate of frequency deviation value:
The calculation element of the frequency deviation value of said calculating near-end machine and remote termination
is to calculate frequency deviation value through the Fitz algorithm
The formula of Fitz algorithm is following:
，
In the following formula, P, N get natural number, and T is the time, and R (m) is the auto-correlation of the carrier signal z (k) that is inserted into, and R (m) is provided by following formula:
Make L
0=L-m, the definition of substitution R (m):
Through revising L
0Value touch the mark.
Further; Said frequency deviation measurement and compensating unit comprise that also calculating
obtains offset and compensate the calculation element to the DDC Digital Down Convert; And calculate
and obtain offset and compensate calculation element to the DUC Digital Up Convert; Wherein
; 0 < μ < 1, this way is to approach actual frequency deviation value through recursive mode.
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 present invention adopts above-mentioned method and structure, has the following advantages:
1. the present invention 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 present invention's 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 of the present invention device.
Fig. 2 b is the remote termination sketch map in the nearly far-end carrier synchronization of the shift frequency machine of the present invention device.
Embodiment
Combine accompanying drawing and embodiment that the present invention is further specified at present.
I, the Q signal used of brief account the present invention 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 scheme of the present invention; Thinking of the present invention 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, the nearly far-end carrier synchronization method of a kind of shift frequency machine of the present invention may further comprise the steps:
Step 1: before the DUC of near-end machine Digital Up Convert, insert a carrier signal, this carrier signal is the sinusoidal wave digital signal of I=c, Q=0, wherein 0≤c≤0.5;
Step 2: is and the frequency RF0 frequency much at one of the radiofrequency signal of near-end machine reception specifically to pass through formula in frequency deviation value
and the compensate of frequency deviation value
of remote termination through calculating near-end machine and remote termination with said carrier signal shift frequency:
Carry out compensate of frequency deviation according to following formula, make 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.Formula
wherein requires that all local oscillators are low local oscillator in the native system.
Further, the value of the c in the step 1 is relevant with the gain of circuit board, preferred c=0.15.
Further, before the DUC of near-end machine Digital Up Convert, insert a carrier signal in the step 1, said carrier signal goes out a channel separately and places the right of useful signal to transmit.
Further; Calculate the frequency deviation
of near-end machine and remote termination in the step 2; Specifically calculate frequency deviation through the Fitz algorithm, the formula of Fitz algorithm is following:
In the following formula, P, N get natural number, because the tone signal modulation index is 1; So P of the present invention gets 1, N is relevant with estimated accuracy, within the specific limits; N is big more, means that the data association is tight more in taking into account apart from correlation far away more; It is accurate more to estimate, but because the existence of noise can not rely on the unlimited N of increasing to improve estimated accuracy; T is the time, i.e. the inverse of the sampling rate after the down-conversion, and the more little performance of T is good more in theory, but when frequency deviation was big, T just can not be too little; R (m) is the auto-correlation of the carrier signal z (k) that is inserted into, and R (m) is provided by following formula:
Above-mentioned formula is applicable to the single computing; So make
; 0 < μ < 1; Approach actual frequency deviation value through recursive mode, can better adapt to this system (opposing deep fade) like this.The μ value is more little in addition, and the time that reaches accurate frequency values is long more, but dysfunctional is good more, and vice versa, so μ need appropriately to select.Preferably, the μ value is 0.05 among the present invention.
In order to adapt to the simple in structure suitable computing principle of FPGA, the L in the above-mentioned formula
0Value be 2
n, make L
0=L-m, the definition of substitution R (m):
，
Through revising L
0Value touch the mark.Preferably, L
0Value be 32.
Further, the compensate of frequency deviation in the step 2 specifically: through calculating
Obtain offset and compensate digital frequency synthesizer DDS, make useful carrier frequency reach zero intermediate frequency, through calculating to the DDC Digital Down Convert
Obtain offset and compensate digital frequency synthesizer DDS, make 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 to the DUC Digital Up Convert
'Identical.
Shown in Fig. 2 a and Fig. 2 b; A kind of nearly far-end carrier synchronization of shift frequency machine device of using said method of the present invention; 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.
Said frequency deviation measurement and compensating unit comprise the calculation element that calculates near-end machine and the frequency deviation value
of remote termination, the calculation element that calculates compensate of frequency deviation value
at least, and according to the result of calculation of the calculation element of calculation element that calculates near-end machine and the frequency deviation value
of remote termination and calculating compensate of frequency deviation value
and with the said carrier signal shift frequency compensation arrangement that is zero intermediate frequency; The calculation element of said calculating compensate of frequency deviation value
is according to computes compensate of frequency deviation value:
The calculation element of the frequency deviation value of said calculating near-end machine and remote termination
is to calculate frequency deviation value through the Fitz algorithm, and the formula of Fitz algorithm is following:
，
In the following formula, P, N get natural number, and T is the time, and R (m) is the auto-correlation of the carrier signal z (k) that is inserted into, and R (m) is provided by following formula:
Make L
0=L-m, the definition of substitution R (m):
，
Through revising L
0Value touch the mark.
Said frequency deviation measurement and compensating unit comprise that also calculating
obtains offset and compensate the calculation element to the digital frequency synthesizer DDS of DDC Digital Down Convert; And calculate
and obtain offset and compensate calculation element to the digital frequency synthesizer DDS of DUC Digital Up Convert; Wherein
; 0 < μ < 1, this way is to approach actual frequency deviation value through recursive mode.
In addition; For the use formula
that adapts to, 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 method of the present invention 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 present invention in conjunction with preferred embodiment; But the those skilled in the art should be understood that; In the spirit and scope of the present invention that do not break away from appended claims and limited; Can make various variations to the present invention in form with on the details, be protection scope of the present invention.
Claims (9)
1. nearly far-end carrier synchronization method of shift frequency machine is characterized in that: may further comprise the steps:
Step 1: before the DUC of near-end machine Digital Up Convert, insert a carrier signal, this carrier signal is the sinusoidal wave digital signal of I=c, Q=0, wherein 0≤c≤0.5;
Step 2: is and the identical frequency of frequency RF0 of the radiofrequency signal of near-end machine reception specifically to pass through formula in frequency deviation value
and the compensate of frequency deviation value
of remote termination through calculating near-end machine and remote termination with said carrier signal shift frequency:
Carry out compensate of frequency deviation according to following formula, make 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.
2. the nearly far-end carrier synchronization method of shift frequency machine according to claim 1 is characterized in that: the c value in the step 1 is 0.15.
3. the nearly far-end carrier synchronization method of shift frequency machine according to claim 1; It is characterized in that: before the DUC of near-end machine Digital Up Convert, insert a carrier signal in the step 1, said carrier signal goes out a channel separately and places the right of useful signal to transmit.
4. the nearly far-end carrier synchronization method of shift frequency machine according to claim 1; It is characterized in that: the frequency deviation
of calculating near-end machine and remote termination in the step 2; Specifically calculate frequency deviation through the Fitz algorithm, the formula of Fitz algorithm is following:
In the following formula, P, N get natural number, and T is the time, and R (m) is the auto-correlation of the carrier signal z (k) that is inserted into, and R (m) is provided by following formula:
Make L
0=L-m, the definition of substitution R (m):
Through revising L
0Value touch the mark;
Make
; 0 < μ < 1, approach actual frequency deviation value through recursive mode.
5. the nearly far-end carrier synchronization method of shift frequency machine according to claim 4 is characterized in that: compensate of frequency deviation specifically: through calculating
Obtain offset and compensate digital frequency synthesizer DDS, make useful carrier frequency reach zero intermediate frequency, through calculating to the DDC Digital Down Convert
Obtain offset and compensate digital frequency synthesizer DDS, make 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 to the DUC Digital Up Convert
'Identical.
6. the nearly far-end carrier synchronization method of shift frequency machine according to claim 4 is characterized in that: the μ value is 0.05.
7. the nearly far-end carrier synchronization method of shift frequency machine according to claim 4 is characterized in that: L
0Value be 32.
8. the nearly far-end carrier synchronization of shift frequency machine device of using said method; Comprise near-end machine and remote termination; The 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 and a DA D/A conversion unit at least; 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 and the 2nd DA D/A conversion unit at least; 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; 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; It is characterized in that:
The near-end machine also comprises carrier signal insertion unit; The output of said carrier signal insertion unit is electrically connected on the input of a DUC Digital Up Convert unit; Remote termination also comprises frequency deviation measurement and compensating unit, and 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 first local oscillator, second local oscillator, the 3rd local oscillator and the 4th local oscillator are low local oscillators; 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; 0≤c≤0.5 wherein; Said frequency deviation measurement and compensating unit comprise the calculation element that calculates near-end machine and the frequency deviation value
of remote termination, the calculation element that calculates compensate of frequency deviation value
at least, and are the compensation arrangement of the frequency identical with the frequency RF0 of the radiofrequency signal of near-end machine reception according to the result of calculation of the calculation element that calculates near-end machine and the frequency deviation value
of remote termination and the calculation element of calculating compensate of frequency deviation value
and with said carrier signal shift frequency;
The calculation element of said calculating compensate of frequency deviation value
is according to computes compensate of frequency deviation value:
The calculation element of the frequency deviation value of said calculating near-end machine and remote termination
is to calculate frequency deviation value through the Fitz algorithm, and the formula of Fitz algorithm is following:
In the following formula, P, N get natural number, and T is the time, and R (m) is the auto-correlation of the carrier signal z (k) that is inserted into, and R (m) is provided by following formula:
Make L
0=L-m, the definition of substitution R (m):
Through revising L
0Value touch the mark.
9. the nearly far-end carrier synchronization of shift frequency machine according to claim 8 device; It is characterized in that: said frequency deviation measurement and compensating unit comprise that also calculating
obtains offset and compensate the calculation element to the digital frequency synthesizer DDS of DDC Digital Down Convert; And calculate
and obtain offset and compensate calculation element to the digital frequency synthesizer DDS of DUC Digital Up Convert; Wherein
, 0 < μ < 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210089782.1A CN102594766B (en) | 2012-03-30 | 2012-03-30 | Method and device for near-far end carrier synchronization of frequency shift machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210089782.1A CN102594766B (en) | 2012-03-30 | 2012-03-30 | Method and device for near-far end carrier synchronization of frequency shift machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102594766A true CN102594766A (en) | 2012-07-18 |
| CN102594766B CN102594766B (en) | 2015-05-13 |
Family
ID=46482974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210089782.1A Active CN102594766B (en) | 2012-03-30 | 2012-03-30 | Method and device for near-far end carrier synchronization of frequency shift machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102594766B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342960A (en) * | 2016-11-29 | 2017-11-10 | 重庆邮电大学 | A kind of unbound nucleus frequency deviation estimating method of suitable Amplitude phase shift keying |
| CN111585675A (en) * | 2020-04-30 | 2020-08-25 | 中国电力科学研究院有限公司 | Power communication channel simulation device and working method thereof |
| CN113206682A (en) * | 2021-04-29 | 2021-08-03 | 展讯通信（上海）有限公司 | Near-end combining unit, far-end combining unit and indoor distribution system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0844764A2 (en) * | 1996-11-20 | 1998-05-27 | Nec Corporation | Automatic frequency correction for a radio calling system |
| CN1297611A (en) * | 1998-02-20 | 2001-05-30 | 艾利森电话股份有限公司 | Method and apparatus for detecting frequency synchronization signal |
| CN1457570A (en) * | 2001-07-23 | 2003-11-19 | 连宇通信有限公司 | Frequency Correction Method and Device for CDMA Communication System Receiver |
| CN1794610A (en) * | 2004-12-21 | 2006-06-28 | 三星电子株式会社 | Multi-transceiver system and methods of compensating offset frequency |
| CN101197606A (en) * | 2006-12-04 | 2008-06-11 | 京信通信技术(广州)有限公司 | Digital intermediate frequency conversion method and system used in repeater |
-
2012
- 2012-03-30 CN CN201210089782.1A patent/CN102594766B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0844764A2 (en) * | 1996-11-20 | 1998-05-27 | Nec Corporation | Automatic frequency correction for a radio calling system |
| CN1297611A (en) * | 1998-02-20 | 2001-05-30 | 艾利森电话股份有限公司 | Method and apparatus for detecting frequency synchronization signal |
| CN1457570A (en) * | 2001-07-23 | 2003-11-19 | 连宇通信有限公司 | Frequency Correction Method and Device for CDMA Communication System Receiver |
| CN1794610A (en) * | 2004-12-21 | 2006-06-28 | 三星电子株式会社 | Multi-transceiver system and methods of compensating offset frequency |
| CN101197606A (en) * | 2006-12-04 | 2008-06-11 | 京信通信技术(广州)有限公司 | Digital intermediate frequency conversion method and system used in repeater |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342960A (en) * | 2016-11-29 | 2017-11-10 | 重庆邮电大学 | A kind of unbound nucleus frequency deviation estimating method of suitable Amplitude phase shift keying |
| CN107342960B (en) * | 2016-11-29 | 2019-12-31 | 重庆邮电大学 | A Non-data-aided Frequency Offset Estimation Method Suitable for Amplitude Phase Shift Keying |
| CN111585675A (en) * | 2020-04-30 | 2020-08-25 | 中国电力科学研究院有限公司 | Power communication channel simulation device and working method thereof |
| CN111585675B (en) * | 2020-04-30 | 2022-07-26 | 中国电力科学研究院有限公司 | Power communication channel simulation device and working method thereof |
| CN113206682A (en) * | 2021-04-29 | 2021-08-03 | 展讯通信（上海）有限公司 | Near-end combining unit, far-end combining unit and indoor distribution system |
| CN113206682B (en) * | 2021-04-29 | 2022-09-16 | 展讯通信（上海）有限公司 | Near-end combining unit, far-end combining unit and indoor distribution system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102594766B (en) | 2015-05-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Han et al. | Multifunctional transceiver for future intelligent transportation systems | |
| TWI241793B (en) | Method and apparatus for I/Q mismatch calibration in a receiver | |
| CN110824507B (en) | Simulator of upper note receiving processor of navigation satellite | |
| CN104935539B (en) | A system and method for calibrating a radio frequency transceiver | |
| CN105765872B (en) | Generation method, generating means, method of reseptance and the reception device of spread-spectrum signal | |
| CN103458424A (en) | Self-interference elimination method based on power detection and loop delay calculation | |
| CN109660277B (en) | A device and method for generating hybrid spread spectrum information | |
| Na et al. | Leggiero: Analog WiFi backscatter with payload transparency | |
| US20170207939A1 (en) | Communication apparatus for increasing communication speeds, spectral efficiency and enabling other benefits | |
| CN104917556A (en) | Synchronous multi-beam signal generation method based on ultrahigh-speed DAC | |
| US9912357B1 (en) | Digital polar transmitter having a digital front end | |
| CN105450380A (en) | Fast fourier transform (FFT) carrier frequency estimation and Costas loop based non-cooperative communication carrier synchronization system | |
| WO2018052612A1 (en) | Amplitude-modulation signal and phase-modulation signal delay adjustment for polar transmitter | |
| CN102176656B (en) | Broadband up-converter and up-conversion method | |
| CN102594766B (en) | Method and device for near-far end carrier synchronization of frequency shift machine | |
| JP5696622B2 (en) | Wireless transmission device | |
| CN108649993A (en) | Whether there is or not communication signal transmissions delay measurement systems when plasma for one kind | |
| CN202488730U (en) | Frequency shift machine near-far end carrier synchronizer | |
| CN102386851B (en) | Master-slave equipment system | |
| CN103795435B (en) | A kind of image frequency suppressing method and device | |
| CN101795252A (en) | Direct variable frequency modulation method and modulation device thereof | |
| CN108881086B (en) | Circuit for modulating signal and method for modulating signal | |
| De Angelis et al. | Performance assessment of chirp-based time dissemination and data communications in inductively coupled links | |
| Sutam et al. | SAGC Circuit Design and Implementation for FSK Modem through Radio Channel | |
| CN110212997A (en) | A kind of acquisition methods and device for modulating the bit error rate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Method and device for near-far end carrier synchronization of frequency shift machine Effective date of registration: 20161221 Granted publication date: 20150513 Pledgee: China Co truction Bank Corp Xiamen branch Pledgor: Fujian Jing'ao Communication Science & Technology Co., Ltd. Registration number: 2016990001151 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model |