CN102594766B - 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
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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 Ve and frequency deviation compensation value F of the near-end machine and the far-end machine, through special formula: F=Ve*(1-RF0/RF1), wherein RF0 is the frequency of the radio frequency signal received by the near-end machine, 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 frequency shift machine, be specifically related to the nearly far end carrier synchronization of frequency shift machine.
Background technology
In order to overcome intra-frequency repeater self-excitation and can not omnidirectional cover problem, frequency-shift repeater is widely used, its general principle is that the network signal of a certain frequency range is being upconverted to other frequency ranges proximally by frequency converter, go out through antenna transmission after amplifying process, receive at the antenna of far-end recycling with frequency range, return former frequency range by frequency converter down-conversion after process, then with omnidirectional or directional antenna, target area is covered.The process of upward signal then in contrast.Said process often uses frequency shift machine to realize, and what wherein realize far-end function is remote termination, and what realize near-end function is near-end machine.
As shown in the near-end machine of Fig. 1 a and the remote termination schematic diagram of Fig. 1 b, in near-end machine, signal after the numerical portion that the frequency of oscillation that radiofrequency signal RF0 and the first crystal oscillator produce delivers to circuit after the first local oscillator mixes carries out variable-frequency filtering is mixed into signal RF1 through the 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 remote termination, the radiofrequency signal RF1 received
'signal after the numerical portion that the frequency of oscillation produced with the second crystal oscillator delivers to circuit after the 3rd local oscillator mixes carries out variable-frequency filtering is 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 said process, in the ideal case, the RF1 that receives of remote termination
'frequency and the frequency of RF1 that sends out of near-end machine, and the RF0 that remote termination sends out
'frequency be identical with the frequency of the RF0 that near-end machine receives, RF1 in reality
'frequency be identical with the frequency of RF1, but RF0
'frequency be different from the frequency of RF0, this is accuracy due to oscillator and the equal factor of nearly far-end crystal oscillator, causes local oscillator frequency deviation, makes numerical portion to reach zero intermediate frequency, 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, provides a kind of nearly far end carrier synchronization method of frequency shift machine and device, solves the problem that cannot reach zero intermediate frequency described in background technology.
In order to solve the problems of the technologies described above, the nearly far end carrier synchronization method of a kind of frequency shift machine of the present invention, comprises the following steps:
Step 1: inserted a carrier signal before the DUC Digital Up Convert of near-end machine, this carrier signal is the sinusoidal wave digital signal of I=c, Q=0, is wherein greater than 0≤c≤0.5;
Step 2: at remote termination by calculating the frequency deviation value of near-end machine and remote termination
with compensate of frequency deviation value
be the frequency almost identical with the frequency RF0 of the radiofrequency signal that near-end machine receives by described carrier signal shift frequency, especially by formula:
, wherein RF0 is the frequency of the radiofrequency signal that near-end machine receives, and RF1 is the frequency of the radiofrequency signal that near-end machine sends,
Compensate of frequency deviation is carried out, the frequency RF0 of the radiofrequency signal that the frequency RF0 of the radiofrequency signal that near-end machine is received and remote termination send according to above formula
'identical.
Further, the value of the c in step 1 is relevant with the gain of circuit board, preferred c=0.15.
Further, insert a carrier signal in step 1 before the DUC Digital Up Convert of near-end machine, described carrier signal goes out separately the right that a channel is placed in useful signal and transmits.
Further, the frequency deviation of near-end machine and remote termination is calculated in step 2
, calculate frequency deviation particular by Fitz algorithm, the formula of Fitz algorithm is as follows:
，
In above formula, P, N get natural number, because tone signal modulation index is 1, P of the present invention gets 1, N is relevant with estimated accuracy, within the specific limits, N is larger, in meaning that correlation far away takes into account distance, data correlation is tightr, it is more accurate to estimate, but due to the existence of noise, the unlimited N that increases can not be relied on to improve estimated accuracy; T is the time, the inverse of the sampling rate namely after down-conversion, and the less performance of T is better in theory, but when frequency deviation is larger, T just can not be too little; R (m) is the auto-correlation of the carrier signal z (k) be inserted into, and R (m) is provided by following formula:
, wherein, L is he number, and L gets natural number;
Above-mentioned formula is applicable to single computing, therefore order
, 0< μ <1, approaches actual frequency deviation value by the mode of recurrence, better can adapt to this system (opposing deep fade) like this.μ value is less in addition, and the time reaching precise frequencies value is longer, but dysfunctional is better, and vice versa, therefore μ selects to need appropriately.Preferably, in the present invention, μ value is 0.05.
In order to the structure adapting to FPGA is simply applicable to computing principle, the L in above-mentioned formula
0value be 2
n, make L
0=L-m, substitutes into the definition of R (m):
，
By amendment L
0value touch the mark.Preferably, L
0value be 32.
Further, the compensate of frequency deviation in step 2 is specifically: by calculating
obtain offset to compensate to the digital frequency synthesizer DDS of DDC Digital Down Convert, make useful carrier frequency reach zero intermediate frequency, by calculating
obtain the frequency RF0 that offset compensates the radiofrequency signal sent to the digital frequency synthesizer DDS of DUC Digital Up Convert, the frequency RF0 of the radiofrequency signal making near-end machine receive and remote termination
'identical.
Apply the nearly far end carrier synchronization device of frequency shift machine of said method, comprise near-end machine and remote termination, near-end machine at least comprises the first local oscillator, second local oscillator, first crystal oscillator, first clock chip, one AD AD conversion unit, one DDC Digital Down Convert unit, one DUC Digital Up Convert unit and a DA D/A conversion unit, remote termination at least comprises the 3rd local oscillator, 4th local oscillator, second crystal oscillator, second clock chip, 2nd AD AD conversion unit, 2nd DDC Digital Down Convert unit, 2nd DUC Digital Up Convert unit and the 2nd DA D/A conversion unit, described first crystal oscillator and the first clock chip are the first local oscillator, second local oscillator, one AD AD conversion unit, one DDC Digital Down Convert unit, one DUC Digital Up Convert unit and a DA D/A conversion unit provide clock frequency, and armed radio frequency signal frequency and clock frequency export remote termination to via a DDC Digital Down Convert unit and a DUC Digital Up Convert unit respectively after the first local oscillator of near-end machine transfers to an AD AD conversion unit to a DA D/A conversion unit after by the second local oscillator, described second crystal oscillator and second clock chip are 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 export near-end machine via after the 2nd DDC Digital Down Convert unit and the 2nd DUC Digital Up Convert unit to the 2nd DA D/A conversion unit to respectively after the 3rd local oscillator of remote termination transfers to the 2nd AD AD conversion unit after by the 4th local oscillator, in addition, near-end machine also comprises carrier signal plug-in unit, the output of described carrier signal plug-in 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 described 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, described first local oscillator, the second local oscillator, the 3rd local oscillator and the 4th local oscillator are low local oscillators.Described carrier signal plug-in unit inserts the device of a carrier signal before being at least included in the DUC Digital Up Convert of near-end machine, this carrier signal is the sinusoidal wave digital signal of I=c, Q=0, wherein 0≤c≤0.5, described frequency deviation measurement and compensating unit at least comprise the frequency deviation value calculating near-end machine and remote termination
calculation element, calculate compensate of frequency deviation value
calculation element, and according to calculating the frequency deviation value of near-end machine and remote termination
calculation element and calculate compensate of frequency deviation value
calculation element result of calculation and be the compensation arrangement of zero intermediate frequency by described carrier signal shift frequency;
Described calculating compensate of frequency deviation value
calculation element calculate compensate of frequency deviation value according to following formula:
, wherein RF0 is the frequency of the radiofrequency signal that near-end machine receives, and RF1 is the frequency of the radiofrequency signal that near-end machine sends;
The frequency deviation value of described calculating near-end machine and remote termination
calculation element be calculate frequency deviation value by Fitz algorithm,
The formula of Fitz algorithm is as follows:
，
In above formula, P, N get natural number, and T is the time, and R (m) is the auto-correlation of the carrier signal z (k) be inserted into, and R (m) is provided by following formula:
, wherein, L is he number, and L gets natural number;
Make L
0=L-m, substitutes into the definition of R (m):
，
By amendment L
0value touch the mark.
Further, described frequency deviation measurement and compensating unit also comprise calculating
obtain offset to compensate to the calculation element of DDC Digital Down Convert, and calculate
obtaining offset compensates to the calculation element of DUC Digital Up Convert, wherein
, 0< μ <1, this way approaches actual frequency deviation value by the mode of recurrence.
Wherein, carrier signal plug-in unit: owing to inserting I=c, Q=0(0≤c≤0.5) single-tone carrier wave, so single-tone carrier wave needs to take a frequency, this frequency must not affect the transmission of other carrier waves, therefore the right this frequency can being inserted useful signal is transmitted.
Frequency deviation measurement and compensating unit: it should be noted that the multiple that tone signal the 2nd DDC Digital Down Convert unit extracts, the multiple extracted in theory is more, and the accuracy of algorithm is better, but the frequency deviation region that can measure is less.
The present invention adopts above-mentioned method and structure, has the following advantages:
1. the present invention inserted a carrier signal before the DUC Digital Up Convert of near-end machine, be with the frequency RF0 of radiofrequency signal that near-end machine receive identical frequency by calculating frequency deviation with compensate of frequency deviation by described carrier signal shift frequency at remote termination, thus solve the problem that cannot reach zero intermediate frequency described in background technology, achieve the carrier synchronization of nearly far-end, improve the performance of demodulator;
2. the carrier signal that the present invention inserted before the DUC Digital Up Convert of near-end machine is I=c, Q=0(0≤c≤0.5) sinusoidal wave digital signal, be simple and easy to realize.
Accompanying drawing explanation
Fig. 1 a is the near-end machine of the frequency shift machine of prior art in background technology.
Fig. 1 b is the remote termination of the frequency shift machine of prior art in background technology.
Fig. 2 a is the near-end machine schematic diagram in the nearly far end carrier synchronization device of frequency shift machine of the present invention.
Fig. 2 b is the remote termination schematic diagram in the nearly far end carrier synchronization device of frequency shift machine of the present invention.
Embodiment
Now the present invention is further described with embodiment by reference to the accompanying drawings.
First simply introduce I, Q signal that the present invention uses: communication is the earliest analog communication, suppose that carrier wave is cos (a), signal is cos (b), so by the frequency spectrum shift that coordinates, just obtains:
cos(a)*cos(b)= 1/2[cos(a+b)-cos(a-b)]
Under a carrier wave, create two signals like this, a+b and a-b, and for transmission, in fact only need a signal, that is both select one, and another one is useless, needs to filter.But practice filters is undesirable, be difficult to filter another one completely, so because the existence of another one frequency band, waste a lot of band resource.
After entering digital Age, some moment transmit only have a signal frequency, such as 0, be assumed to be 900MHz, 1 is assumed to be 901MHz, and these two frequencies are in change always, and can not occur simultaneously.This is different from analog communication signal, such as television set, and the frequency band of signal is exactly 6.5MHz.Also having a serious problem, is exactly that signal band resource is more and more valuable, again as simulation the same so simply carrier wave and signal multiplication, can not cause double-sideband signal.
Everybody wishes to obtain most, is exactly input a signal and b signal, obtains single a+b or a-b.Based on this object, we just launch this formula:
cos(a－b)＝cos(a)cos(b)＋sin(a)sin(b)
This formula clearly shows, as long as carrier wave a is multiplied with signal b, afterwards they separately all phase shift 90 degree be multiplied, be added afterwards, just can obtain the signal of a-b.This is in digital communication, and current semiconductor technology can be accomplished completely: 1. digital communication, and the single time only has a frequency, so can phase shift 90 degree.2. adder, multiplier technology are easy to realize.
Be exactly sin (b) because I is exactly cos (b), Q, these two signals combined:
cos(b), sin(b)
cos(b), -sin(b)
-cos(b), sin(b)
-cos(b), -sin(b)
This is exactly that four of I/Q signal has been modulated mutually.
Lower mask body sets forth the solution of the present invention, thinking of the present invention is in near-end machine, insert a carrier signal, this carrier signal is I=c, Q=0(0≤c≤0.5) sinusoidal wave digital signal, i.e. tone signal, because tone signal I and Q when shift frequency is absolute zero intermediate frequency signals is constant, therefore before DUC Digital Up Convert insert I=c, Q=0(0≤c≤0.5) carrier signal, by the intermediate-freuqncy signal of DUC Digital Up Convert for transmitting, be positioned at the rightmost needing to transmit carrier wave.Be zero intermediate frequency at remote termination by the tone signal shift frequency of insertion, owing to there is frequency deviation, so can by the frequency values of tone signal after calculating shift frequency, this frequency values is the frequency deviation that near-end machine local oscillator two produces with remote termination local oscillator one, again by compensating for frequency offset, the frequency RF0 of the radiofrequency signal that the frequency RF0 of the radiofrequency signal that near-end machine is received and remote termination send
'identical.
Concrete, the nearly far end carrier synchronization method of a kind of frequency shift machine of the present invention, comprises the following steps:
Step 1: inserted a carrier signal before the DUC Digital Up Convert of near-end machine, this carrier signal is the sinusoidal wave digital signal of I=c, Q=0, wherein 0≤c≤0.5;
Step 2: at remote termination by calculating the frequency deviation value of near-end machine and remote termination
with compensate of frequency deviation value
be the frequency almost identical with the frequency RF0 of the radiofrequency signal that near-end machine receives by described carrier signal shift frequency, especially by formula:
, wherein RF0 is the frequency of the radiofrequency signal that near-end machine receives, and RF1 is the frequency of the radiofrequency signal that near-end machine sends,
Compensate of frequency deviation is carried out, the frequency RF0 of the radiofrequency signal that the frequency RF0 of the radiofrequency signal that near-end machine is received and remote termination send according to above formula
'identical.Wherein formula
, require that in native system, all local oscillators are low local oscillator.
Further, the value of the c in step 1 is relevant with the gain of circuit board, preferred c=0.15.
Further, insert a carrier signal in step 1 before the DUC Digital Up Convert of near-end machine, described carrier signal goes out separately the right that a channel is placed in useful signal and transmits.
Further, the frequency deviation of near-end machine and remote termination is calculated in step 2
, calculate frequency deviation particular by Fitz algorithm, the formula of Fitz algorithm is as follows:
，
In above formula, P, N get natural number, because tone signal modulation index is 1, P of the present invention gets 1, N is relevant with estimated accuracy, within the specific limits, N is larger, in meaning that correlation far away takes into account distance, data correlation is tightr, it is more accurate to estimate, but due to the existence of noise, the unlimited N that increases can not be relied on to improve estimated accuracy; T is the time, the inverse of the sampling rate namely after down-conversion, and the less performance of T is better in theory, but when frequency deviation is larger, T just can not be too little; R (m) is the auto-correlation of the carrier signal z (k) be inserted into, and R (m) is provided by following formula:
, wherein, L is he number, and L gets natural number;
Above-mentioned formula is applicable to single computing, therefore order
, 0< μ <1, approaches actual frequency deviation value by the mode of recurrence, better can adapt to this system (opposing deep fade) like this.μ value is less in addition, and the time reaching precise frequencies value is longer, but dysfunctional is better, and vice versa, therefore μ selects to need appropriately.Preferably, in the present invention, μ value is 0.05.
In order to the structure adapting to FPGA is simply applicable to computing principle, the L in above-mentioned formula
0value be 2
n, make L
0=L-m, substitutes into the definition of R (m):
，
By amendment L
0value touch the mark.Preferably, L
0value be 32.
Further, the compensate of frequency deviation in step 2 is specifically: by calculating
obtain offset to compensate to the digital frequency synthesizer DDS of DDC Digital Down Convert, make useful carrier frequency reach zero intermediate frequency, by calculating
obtain the frequency RF0 that offset compensates the radiofrequency signal sent to the digital frequency synthesizer DDS of DUC Digital Up Convert, the frequency RF0 of the radiofrequency signal making near-end machine receive and remote termination
'identical.
As shown in Figure 2 a and 2 b, a kind of nearly far end carrier synchronization device of frequency shift machine applying said method of the present invention, comprise near-end machine and remote termination, near-end machine at least comprises the first local oscillator 101, second local oscillator 102, first crystal oscillator 103, first clock chip 104, one AD AD conversion unit 105, one DDC Digital Down Convert unit 106, one DUC Digital Up Convert unit 107, one DA D/A conversion unit 108 and carrier signal plug-in unit 109, described first crystal oscillator 103 and the first clock chip 104 are the first local oscillator 101, second local oscillator 102, one AD AD conversion unit 105, one DDC Digital Down Convert unit 106, one DUC Digital Up Convert unit 107, one DA D/A conversion unit 108 and carrier signal plug-in unit 109 provide accurate clock frequency, described first local oscillator 101, one AD AD conversion unit 105, one DDC Digital Down Convert unit 106, one DUC Digital Up Convert unit 107, one DA D/A conversion unit 108 and the second local oscillator 102 are connected in series, the output of described carrier signal plug-in 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 produced by the first crystal oscillator 103 and the first clock chip 104 transfer to a DDC Digital Down Convert unit 106 again after the first local oscillator 101 of near-end machine transfers to an AD AD conversion unit 105, the signal exported transfers to a DUC Digital Up Convert unit 107 together with the carrier signal of carrier signal plug-in unit 109, the signal exported exports radio frequency signal frequency RF1 to remote termination via after the second local oscillator again via after a DA D/A conversion unit 108, described carrier signal plug-in unit 109 inserts the device of a carrier signal before being at least included in the DUC Digital Up Convert of near-end machine, this carrier signal is the sinusoidal wave digital signal of I=c, Q=0, wherein 0≤c≤0.5,
Remote termination at least comprises the 3rd local oscillator 201, 4th local oscillator 202, second crystal oscillator 203, second clock chip 204, 2nd AD AD conversion unit 205, 2nd DDC Digital Down Convert unit 206, 2nd DUC Digital Up Convert unit 207, 2nd DA D/A conversion unit 208 and frequency deviation measurement and compensating unit 209, described second crystal oscillator 203 and second clock chip 204 are the 3rd local oscillator 201, 4th local oscillator 202, 2nd AD AD conversion unit 205, 2nd DDC Digital Down Convert unit 206, 2nd DUC Digital Up Convert unit 207, 2nd DA D/A conversion unit 208 and frequency deviation measurement and compensating unit 209 provide clock frequency, described 3rd local oscillator 201, 2nd AD AD conversion unit 205, 2nd DDC Digital Down Convert unit 206, 2nd DUC Digital Up Convert unit 207, 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
'after the 3rd local oscillator 201 of remote termination transfers to the 2nd AD AD conversion unit 205, the 2nd DDC Digital Down Convert unit 206 is transferred to the clock frequency produced by the second crystal oscillator 203 and second clock chip 204, the signal exported transfers to the 2nd DUC Digital Up Convert unit 207 with frequency deviation measurement together with the compensating signal of compensating unit 209, and signal and the frequency deviation measurement of output transfer to after the 2nd DA D/A conversion unit 208 and export radio frequency signal frequency RF0 after by the 4th local oscillator 202 together with the compensating signal of compensating unit 209
'to near-end machine, wherein, frequency deviation measurement and compensating unit 209 control the 2nd DDC Digital Down Convert unit 206 and the 2nd DUC Digital Up Convert unit 207, specifically control the DDS Direct Digital Synthesizer of the 2nd DDC Digital Down Convert unit 206 and the 2nd DUC Digital Up Convert unit 207, described frequency deviation measurement and compensating unit 209 are for calculating the frequency deviation value of near-end machine and remote termination
with compensate of frequency deviation value
with the frequency that the frequency RF0 of the radiofrequency signal received for near-end machine by described carrier signal shift frequency is almost identical.
Described frequency deviation measurement and compensating unit at least comprise the frequency deviation value calculating near-end machine and remote termination
calculation element, calculate compensate of frequency deviation value
calculation element, and according to calculating the frequency deviation value of near-end machine and remote termination
calculation element and calculate compensate of frequency deviation value
calculation element result of calculation and be the compensation arrangement of zero intermediate frequency by described carrier signal shift frequency; Described calculating compensate of frequency deviation value
calculation element calculate compensate of frequency deviation value according to following formula:
, wherein RF0 is the frequency of the radiofrequency signal that near-end machine receives, and RF1 is the frequency of the radiofrequency signal that near-end machine sends;
The frequency deviation value of described calculating near-end machine and remote termination
calculation element be calculate frequency deviation value by Fitz algorithm, the formula of Fitz algorithm is as follows:
，
In above formula, P, N get natural number, and T is the time, and R (m) is the auto-correlation of the carrier signal z (k) be inserted into, and R (m) is provided by following formula:
, wherein, L is he number, and L gets natural number;
Make L
0=L-m, substitutes into the definition of R (m):
，
By amendment L
0value touch the mark.
Described frequency deviation measurement and compensating unit also comprise calculating
obtain offset to compensate to the calculation element of the digital frequency synthesizer DDS of DDC Digital Down Convert, and calculate
obtaining offset compensates to the calculation element of the digital frequency synthesizer DDS of DUC Digital Up Convert, wherein
, 0< μ <1, this way approaches actual frequency deviation value by the mode of recurrence.
In addition, the use formula in order to adapt to
, described first local oscillator, the second local oscillator, the 3rd local oscillator and the 4th local oscillator are low local oscillators.
In said structure, carrier signal plug-in unit 109: owing to inserting I=c, Q=0(0≤c≤0.5) single-tone carrier wave, so single-tone carrier wave needs to take a frequency, this frequency must not affect the transmission of other carrier waves, therefore the right this frequency can being inserted useful signal is transmitted.
Frequency deviation measurement and compensating unit 209: it should be noted that the multiple that tone signal the 2nd DDC Digital Down Convert unit 206 extracts, the multiple extracted in theory is more, and the accuracy of algorithm is better, but the frequency deviation region that can measure is less.
Experimental result shows, method of the present invention can calculate the frequency of frequency deviation and compensating for frequency offset makes the RF spot of the input of near-end machine almost consistent with the RF spot that remote termination exports.
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; can make a variety of changes the present invention in the form and details, be protection scope of the present invention.
Claims (9)
1. the nearly far end carrier synchronization method of frequency shift machine, is characterized in that: comprise the following steps:
Step 1: inserted a carrier signal before the DUC Digital Up Convert of near-end machine, this carrier signal is the sinusoidal wave digital signal of I=c, Q=0, wherein 0≤c≤0.5;
Step 2: at remote termination by calculating the frequency deviation value V of near-end machine and remote termination
ebe the frequency identical with the frequency RF0 of the radiofrequency signal that near-end machine receives with compensate of frequency deviation value F by described carrier signal shift frequency, especially by formula:
F=V
e* (1-RF0/RF1), wherein RF0 is the frequency of the radiofrequency signal that near-end machine receives, and RF1 is the frequency of the radiofrequency signal that near-end machine sends,
Carry out compensate of frequency deviation according to above formula, the frequency RF0 of the radiofrequency signal that near-end machine is received is identical with the frequency RF0 ' of the radiofrequency signal that remote termination sends.
2. the nearly far end carrier synchronization method of frequency shift machine according to claim 1, is characterized in that: the c value in step 1 is 0.15.
3. the nearly far end carrier synchronization method of frequency shift machine according to claim 1, it is characterized in that: before the DUC Digital Up Convert of near-end machine, insert a carrier signal in step 1, described carrier signal goes out separately the right that a channel is placed in useful signal and transmits.
4. the nearly far end carrier synchronization method of frequency shift machine according to claim 1, is characterized in that: the frequency deviation V calculating near-end machine and remote termination in step 2
e, calculate frequency deviation particular by Fitz algorithm, the formula of Fitz algorithm is as follows:
In above formula, P, N get natural number, and T is the time, and R (m) is the auto-correlation of the carrier signal z (k) be inserted into, and R (m) is provided by following formula:
Make L
0=L-m, substitutes into the definition of R (m):
By amendment L
0value touch the mark;
Make V=μ * V
e, 0< μ <1, approaches actual frequency deviation value by the mode of recurrence.
5. the nearly far end carrier synchronization method of frequency shift machine according to claim 4, it is characterized in that: compensate of frequency deviation specifically: obtain offset compensate to the digital frequency synthesizer DDS of DDC Digital Down Convert by calculating V* (1-RF0/RF1), useful carrier frequency is made to reach zero intermediate frequency, obtaining offset by calculating-V*RF0/RF1 compensates to the digital frequency synthesizer DDS of DUC Digital Up Convert, and the frequency RF0 of the radiofrequency signal that near-end machine is received is identical with the frequency RF0 ' of the radiofrequency signal that remote termination sends.
6. the nearly far end carrier synchronization method of frequency shift machine according to claim 4, is characterized in that: μ value is 0.05.
7. the nearly far end carrier synchronization method of frequency shift machine according to claim 4, is characterized in that: L
0value be 32.
8. apply the nearly far end carrier synchronization device of frequency shift machine of the arbitrary described frequency shift machine nearly far end carrier synchronization method of the claims 1-7, comprise near-end machine and remote termination, near-end machine at least comprises the first local oscillator, second local oscillator, first crystal oscillator, first clock chip, one AD AD conversion unit, one DDC Digital Down Convert unit, one DUC Digital Up Convert unit and a DA D/A conversion unit, remote termination at least comprises the 3rd local oscillator, 4th local oscillator, second crystal oscillator, second clock chip, 2nd AD AD conversion unit, 2nd DDC Digital Down Convert unit, 2nd DUC Digital Up Convert unit and the 2nd DA D/A conversion unit, described first crystal oscillator and the first clock chip are the first local oscillator, second local oscillator, one AD AD conversion unit, one DDC Digital Down Convert unit, one DUC Digital Up Convert unit and a DA D/A conversion unit provide clock frequency, and armed radio frequency signal frequency and clock frequency export remote termination to via a DDC Digital Down Convert unit and a DUC Digital Up Convert unit respectively after the first local oscillator of near-end machine transfers to an AD AD conversion unit to a DA D/A conversion unit after by the second local oscillator, described second crystal oscillator and second clock chip are 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 export near-end machine via after the 2nd DDC Digital Down Convert unit and the 2nd DUC Digital Up Convert unit to the 2nd DA D/A conversion unit to respectively after the 3rd local oscillator of remote termination transfers to the 2nd AD AD conversion unit after by the 4th local oscillator, it is characterized in that:
Near-end machine also comprises carrier signal plug-in unit, the output of described carrier signal plug-in 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 described 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; Described first local oscillator, the second local oscillator, the 3rd local oscillator and the 4th local oscillator are low local oscillators; Described carrier signal plug-in unit inserts the device of a carrier signal before being at least included in the DUC Digital Up Convert of near-end machine, this carrier signal is the sinusoidal wave digital signal of I=c, Q=0, wherein 0≤c≤0.5, described frequency deviation measurement and compensating unit at least comprise the frequency deviation value V calculating near-end machine and remote termination
ecalculation element, calculate the calculation element of compensate of frequency deviation value F, and according to calculating the frequency deviation value V of near-end machine and remote termination
ecalculation element with calculate compensate of frequency deviation value F calculation element result of calculation and by described carrier signal shift frequency be the compensation arrangement of the frequency identical with the frequency RF0 of the radiofrequency signal that near-end machine receives;
The calculation element of described calculating compensate of frequency deviation value F calculates compensate of frequency deviation value according to following formula:
F=V
e* (1-RF0/RF1), wherein RF0 is the frequency of the radiofrequency signal that near-end machine receives, and RF1 is the frequency of the radiofrequency signal that near-end machine sends;
The frequency deviation value V of described calculating near-end machine and remote termination
ecalculation element be calculate frequency deviation value by Fitz algorithm, the formula of Fitz algorithm is as follows:
In above formula, P, N get natural number, and T is the time, and R (m) is the auto-correlation of the carrier signal z (k) be inserted into, and R (m) is provided by following formula:
Make L
0=L-m, substitutes into the definition of R (m):
By amendment L
0value touch the mark.
9. the nearly far end carrier synchronization device of frequency shift machine according to claim 8, it is characterized in that: described frequency deviation measurement and compensating unit also comprise and calculate V* (1-RF0/RF1) and obtain offset and compensate to the calculation element of the digital frequency synthesizer DDS of DDC Digital Down Convert, and calculate-V*RF0/RF1 and obtain offset and compensate to the calculation element of the digital frequency synthesizer DDS of DUC Digital Up Convert, wherein V=μ * V
e, 0< μ <1.
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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 |
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