CN102625327A - Automatic frequency point tracking method for digital intermediate frequency optical fiber repeater - Google Patents
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Abstract
The invention belongs to the technical field of radio transmission systems, and provides a high-reliability and high-real-time performance automatic frequency point tracking method for a digital intermediate frequency optical repeater. The method comprises the following steps of: 1) first, performing analogue-to-digital (A/D) sampling on a signal of which the frequency is shifted to an intermediate frequency by a repeater, digitalizing the signal and performing frequency mixing on the digitalized signal in a numerically controlled oscillator (NCO); then, filtering the signal by using a finite impulse response (FIR) filter; and finally, performing secondary extraction of data; 2) inputting I and Q signals which are subjected to the secondary extraction into a power calculator, and performing square summation to calculate instantaneous power: P instantaneous=(I<2>+Q<2>), calculating the power by using an accumulation module in a power cumulative calculation mode, and then transmitting the power into a power comparison module; and 3) comparing the received power values of signals at frequency-changed frequency points output from each power accumulation module by using the power comparison module according to an order from large to small, recording the frequency points corresponding to the power, and transmitting the frequency points to an upper computer.
Description
Technical field
the invention belongs to the radio transmission system technical field, relate in particular to a kind of digital intermediate frequency optical fiber repeater frequency automatic tracking method.
Background technology
repeater function amplifies exactly from the base station that (descending) and travelling carriage (up) receive the useful signal of coming, and the signal after will amplifying sends through antenna (or other coupled modes).Improve the covering power of system base-station through this mode.
When working,
repeater must keep in full accord by same donor base station (descending) frequency.The working frequency points of repeater generally all is to be provided with through the repeater management system, and this management system is independent of base station system.Like this, when base station frequency point changed, the repeater management system can't directly be known its variation.
industry at present are that the repeater comparatively common method of change working frequency points is: assign note through direct amplifying station monitoring and order each repeater completion to change frequently; Some supervisory control system is uncontrollable, can only artificially change to the scene frequently.Therefore, when the GSM base station frequency point is optimized, need cost plenty of time and energy, bring very big inconvenience for the network optimization staff.
Summary of the invention
the present invention is exactly to the problems referred to above, provides a kind of reliability, real-time good, the digital intermediate frequency optical fiber repeater frequency automatic tracking method that flexibility is high.
for realizing above-mentioned purpose, the present invention adopts following technical scheme, the present invention includes following steps.
1) the repeater shift frequency is at first sampled through A/D to the signal of intermediate frequency; Get into NCO after the digitlization and carry out mixing; Become zero-frequency, and export digital carrier I, Q signal that two-way differs 90 degree, this two paths of signals is sent into the CIC decimation filter respectively; Carry out filtering through the FIR filter more subsequently, carry out the second decimation of data at last.
2) I behind the second decimation, Q signal input power calculator are carried out square anded instantaneous power a: P
Instantaneous
=(I
2
+ Q
2
), adopt power accumulation calculating mode to come rated output through accumulator module again, send into the power comparison module afterwards.
3) performance number that changes frequent some signal of power comparison module each power accumulator module output that will receive is relatively come out according to order from big to small; And its power frequency points corresponding also noted in the lump; Send host computer to; The method that relatively adopts bubble sort of power wherein, every collection finishes a frame power data, just performance number is carried out bubble sort one time; At last, host computer will be from frequency point setting that motion tracking goes out to the frequency-selecting passage of repeater operate as normal.
are as a kind of preferred version; Step 1) according to the invention is when new frequency signal of input; After the AD digitlization; The power that step 2) will calculate this frequency is compared with the power of each good frequency-selecting frequency of step 3) ordering one by one, sees the adjacent frequency of this frequency whether existence is wherein arranged.
if the neighbour of this frequency is not frequently, it just can be regarded as a new frequency word, and the frequency F0 minimum with power in the frequency of each frequency-selecting channel signal compares; If power is greater than the power P 0 of F0; Replace F0 so, restart bubble sort, draw a new sequence; If power is less than P0, the frequency of the digital signal that directly will newly import discards.
if the frequently adjacent of this frequency arranged, the frequency of setting new input is Fnew, and power is Pnew; Frequency with its adjacent frequency in the frequency of each frequency-selecting channel signal that ordering is good is Fx, and power is Px, and two kinds of possibilities are arranged so.
<b > 1, Pnew< Px, then Fx is the dominant frequency point, Fnew is the frequently adjacent of Fx, abandons Fx.</b>
2, Pnew>Px, then Fnew is the dominant frequency point, Fx is that the adjacent of Fnew keeps Fnew frequently, abandons Fx, and need restart bubble sort one time, the frequency Fnew of input newly is aligned in the sequence of frequency of each frequency-selecting channel signal.
as another kind of preferred version, when the power of the adjacent signal C frequently that is considered to a certain signal B during greater than a certain threshold value LINE2, do not abandon this signal C earlier, and it is kept in, and it is effective to put a sign flag; Afterwards when receiving signal A; If find that signal B is the adjacent frequency of signal A, and sign flag is effective, explains that so signal A is a main signal; Signal B is that the frequency of signal A is revealed; Should signal B be discarded, and temporary before signal C is resumed out as normal working signal, it is invalid to indicate that flag puts.
beneficial effect of the present invention: adopt method of the present invention can realize to frequency from motion tracking, from this simple loaded down with trivial details work, free the network optimization personnel; And reliability, real-time are good, and flexibility is high; In addition, the present invention has effectively practiced thrift the system transmissions resource, improves system suitability, and cost is low.
Description of drawings
further specify the present invention below in conjunction with accompanying drawing and embodiment.Protection range of the present invention not only is confined to the statement of following content.
Fig. 1 digital optical fiber direct station near-end machine system.
Fig. 2 digital optical fiber direct station remote termination system.
The structure of
Fig. 3 digital intermediate frequency FPGA.
Fig. 4 frequency tracking system of the present invention theory diagram.
The structured flowchart that
Fig. 5 frequency of the present invention is followed the tracks of.
The adjacent signal schematic representation frequently of
Fig. 6 400KHz.
Embodiment
The realization of
automatic tracking technique of frequency belongs to a more single independently module of function ratio, and it generally need be embedded in the digital intermediate frequency unit of digital optical fiber direct station and use.For clearly understanding technological incidence of criminal offenses of the present invention, at first with digital optical fiber direct station with and digital intermediate frequency unit principle briefly introduce.
are respectively the near-end machine and the remote termination system of digital optical fiber direct station like Fig. 1, shown in Figure 2.The near-end machine receives the signal of mobile communication base station, is down-converted to intermediate-freuqncy signal, transforms to digital signal through high-speed ADC; Be packaged into serial data through after the Digital Signal Processing by certain frame format; Send to remote termination through fiber optical transceiver again, separate frame, return to intermediate-freuqncy signal through baseband processing unit; Through upconverting to radio frequency, launch again through RF power amplification; After the remote termination receiving subsystem receives, be down-converted to intermediate-freuqncy signal from the up signal of portable terminal, then through above-mentioned inverse process; Get back to the near-end repeater through optical fiber; Receive to the base station, accomplished the far-end covering function of mobile communication base station like this, become a kind of end that zooms out of base station.
in digital optical fiber direct station, one of its key technology is the Digital IF Processing technology.
no matter its structure of near-end machine or remote termination is all basic identical, mainly comprise the power module unit, the MCU administrative unit; Two-way ADC and two-way DAC Date Conversion Unit, FPGA digital signal processing unit, clock unit; Clock Managing Unit, compositions such as optical module unit.
Among
the present invention, the automatic tracking technique of frequency can be used as a function ratio more independently module be placed among the digital signal processing unit FPGA (XILINX Spartan6100t) and realize.Among the FPGA, mainly just realized Digital Signal Processing, serdes transfer of data, and the automatic following function of frequency.Because up, descending frequency is corresponding among the GSM, the automatic tracking technique of frequency is only being realized in the link down.FPGA implementation structure such as Fig. 3 substantially, its principle realizes as follows.
Two kinds of frequency-selecting passages have mainly been designed in
, and wherein a kind of is repeater operate as normal frequency-selecting passage, establishes 16 the tunnel altogether, and signal is through NCO, and CIC through the packing of CPRI protocol data, sends to the repeater remote termination by optical fiber after the FIR resume module; A kind of in addition is the frequency automatic tracking channel, has only 1 the tunnel, except the frequency-selecting function, has increased the design of real-time measurement carrier power, through measuring the power of carrier wave, for the automatic track algorithm of frequency provides the data input, finally selects effective carrier wave.
The theory diagram of
frequency automatic tracking system of the present invention is as shown in Figure 4.Wherein concrete execution mode is following: automatic all frequencies in the carrier track searching loop bandwidth, accomplish the power detection of each frequency, and this passage is an executed in real time always to the analysis of carrier power.According to the NCO parameter that constantly changes passage, promptly carrier frequency word parameter selects successively different frequent points to carry out power detection in tracing process.Calculate after the power of each frequency,, select effective frequency of working in the base station again according to certain method filtering noise and clutter.Export these frequencies to Surveillance center at last, Surveillance center exports useful frequency word to the frequency-selecting passage of operate as normal again, and calculates frequency point number and export host computer to.
Specifically set forth technical scheme of the present invention through several parts below
.
The realization of
, digital signal processing module.
The inside of
frequency automatic tracking system realizes that block diagram is as shown in Figure 5.Digital signal processing is: digital signal sequences and NCO through after the AD sampling multiply each other; Become zero-frequency; And export digital carrier I, the Q signal that two-way differs 90 degree, and frequency is 61.44MHz, this two paths of signals is sent into CIC decimation filter (64 times of extractions) more respectively; The back signal frequency of coming out is reduced to 0.96MHz, carries out filtering through the FIR filter more subsequently.0.96MHz data transfer rate for power calculation difficulty relatively also, so need carry out the second decimation of data.
two, power accumulator.
The time of
basic frame of GSM is 4.6125ms, can sample at least one data for guaranteeing each time slot, and the clock with second decimation is decided to be 26 KHz or 52KHz at last; The sampling of two GSM time slots is totally 30 data, or 30 data of a GSM time slot sampling, and 240 data of a GSM frame sampling so not only can guarantee preferably precision but also can avoid the too high performance requirement of FPGA proposition.
According to rating formula, I, the Q signal of ingoing power calculator carried out a square summation: P
Instantaneous
=(I
2
+ Q
2
).The power of this moment is instantaneous power, but such power is unsettled, is not suitable for direct measurement as watt level.Can use power accumulation calculating mode to come rated output.The clock that uses is 26 or 52KHz, 1 frame GSM signal is sampled, the power sum of calculating sampling point, promptly 240 data add up and: P=∑ (I
2
+ Q
2
).The power of each frequency is to add up as power with the data sum of 240 points of this frame, sends into the power comparison module afterwards.
three, power comparator.
After
power comparison module receives the performance number of 16 passages of power accumulator module output; The power of these 16 passages is relatively come out according to order from big to small; And its power frequency points corresponding also noted in the lump, send host computer to.The method that relatively adopts bubble sort of power wherein, every collection finishes a frame power data, just performance number is carried out bubble sort one time.At last, the frequency that host computer will go out from motion tracking is set on the channel of operate as normal.
have a kind of adjacent disturbed condition frequently in comparing the power process, should be noted that.
so-called adjacent interference frequently just is meant: in the GMS system, the bandwidth of signal also has certain power all greater than 200KHz so the adjacent 200KHz of effective frequency will occur, and is as shown in Figure 6.Though adjacent performance number frequently is not very very big; The thresholding that has been higher than interference also; The detectability of carrier frequency during to extremely low telephone traffic for the assurance system, we just can not be only remove and adjacently disturb frequently by improving thresholding, go the adjacent mechanism of disturbing frequently so system must add one.
mechanism is described below: when new power P of input and frequency word FREQ, elder generation compares this frequency word with arranging 16 good frequency words one by one, sees whether adjacent frequency is wherein arranged.
are not if having, even if it does a new frequency word, compare with the minimum frequency F0 of power in 16 frequencies, if power greater than P0, so, replaces F0, restart bubble sort, draw the sequence of 16 new frequencies.If power is less than P0, the frequency that directly will newly import discards.
if having, the frequency of setting new input is Fnew, and power is Pnew.Same its adjacent frequency frequently of arranging in 16 good frequencies is Fx, and power is Px.Two kinds of possibilities are arranged so.
<b > 1, Pnew< Px, then Fx is the dominant frequency point, Fnew is the frequently adjacent of Fx, need abandon Fx.</b>
2, Pnew>Px, then Fnew is the dominant frequency point, Fx is the frequently adjacent of Fnew, needs to keep Fnew, discards Fx.And need restart bubble sort one time, the frequency Fnew that newly imports is aligned in the sequence of 16 frequencies.
also can occur like Fig. 6 situation above-mentioned going in the adjacent mechanism frequently.
have a high power signal A (like BCCH).Have frequency to reveal in its inclined to one side 200K position, the there also has certain power signal B, also has the low-power signal C--TCH of an operate as normal at its inclined to one side 400KHz place.According to the above-mentioned adjacent mechanism of eliminating frequently, the working signal C at 400KHz place is dropped with regard to the adjacent frequency of the signal B that is used as the inclined to one side 200K of BCCH probably partially.So also need carry out a bit improving, avoid producing this mistake filters main signal as neighbour's frequency signal situation to going adjacent mechanism frequently.
solution: as shown in Figure 6, suppose that signal is transferred to the power comparison module from the power accumulator module successively according to the order of frequency C, B, A.
At first, the C signal is preserved
.When receiving the B signal again afterwards, if according to the above-mentioned adjacent mechanism of eliminating frequently, the C signal can be used as the frequently adjacent of B signal and be dropped, and this has just lost normal power signal C.Institute thinks this situation of avoiding, and when being considered to adjacent frequency C power frequently greater than a certain threshold value LINE2, does not abandon this frequency word earlier, keep in, and it is effective to put a sign flag.When receiving a-signal, find that B is the adjacent frequency of A afterwards, and the flag sign effectively; Explain that so a-signal is a main signal, the B signal is that the frequency of A is revealed, and should B be discarded; And temporary before C signal is resumed out as normal working signal, and it is invalid that the flag sign is put.Eliminate mechanism with regard to perfect adjacent frequency like this.
behind process power calculation and power comparison module, FPGA just can export 16 frequency words to single-chip microcomputer.Host computer transfers these frequency words to frequency points corresponding number, shows at monitoring software, and 16 frequency words that monitoring software will upgrade again are set in the frequency-selecting passage of operate as normal, have just accomplished the function of whole frequency from motion tracking.
it is understandable that; More than about specific descriptions of the present invention; Only be used to the present invention is described and be not to be subject to the described technical scheme of the embodiment of the invention; Those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the present invention, to reach identical technique effect; As long as satisfy the use needs, all within protection scope of the present invention.
Claims (3)
1. digital intermediate frequency optical fiber repeater frequency automatic tracking method is characterized in that comprising the steps:
1) the repeater shift frequency is at first sampled through A/D to the signal of intermediate frequency; Get into NCO after the digitlization and carry out mixing; Become zero-frequency, and export digital carrier I, Q signal that two-way differs 90 degree, this two paths of signals is sent into the CIC decimation filter respectively; Carry out filtering through the FIR filter more subsequently, carry out the second decimation of data at last;
2) I behind the second decimation, Q signal input power calculator are carried out square anded instantaneous power a: P
Instantaneous=(I
2+ Q
2), adopt power accumulation calculating mode to come rated output through accumulator module again, send into the power comparison module afterwards;
3) performance number that changes frequent some signal of power comparison module each power accumulator module output that will receive is relatively come out according to order from big to small; And its power frequency points corresponding also noted in the lump; Send host computer to; The method that relatively adopts bubble sort of power wherein, every collection finishes a frame power data, just performance number is carried out bubble sort one time; At last, host computer will be from frequency point setting that motion tracking goes out to the frequency-selecting passage of repeater operate as normal.
2. according to the said digital intermediate frequency optical fiber repeater of claim 1 frequency automatic tracking method; It is characterized in that said step 1) is when new frequency signal of input; After the AD digitlization; The power that step 2) will calculate this frequency is compared with the power of each good frequency-selecting frequency of step 3) ordering one by one, sees the adjacent frequency of this frequency whether existence is wherein arranged;
If this frequency is frequently not adjacent, it just can be regarded as a new frequency word, and the frequency F0 minimum with power in the frequency of each frequency-selecting channel signal compares; If power is greater than the power P 0 of F0; Replace F0 so, restart bubble sort, draw a new sequence; If power is less than P0, the frequency of the digital signal that directly will newly import discards;
If the frequently adjacent of this frequency arranged, the frequency of setting new input is Fnew, and power is Pnew; Frequency with its adjacent frequency in the frequency of each frequency-selecting channel signal that ordering is good is Fx, and power is Px, and two kinds of possibilities are arranged so;
1, Pnew Px, then Fx is the dominant frequency point, Fnew be Fx adjacent frequently, abandon Fx;
2, Pnew>Px, then Fnew is the dominant frequency point, Fx is that the adjacent of Fnew keeps Fnew frequently, abandons Fx, and need restart bubble sort one time, the frequency Fnew of input newly is aligned in the sequence of frequency of each frequency-selecting channel signal.
3. according to the said digital intermediate frequency optical fiber repeater of claim 2 frequency automatic tracking method; It is characterized in that when the power of the adjacent signal C frequently that is considered to a certain signal B during greater than a certain threshold value LINE2; Earlier do not abandon this signal C, and it is kept in, and it is effective to put a sign flag; Afterwards when receiving signal A; If find that signal B is the adjacent frequency of signal A, and sign flag is effective, explains that so signal A is a main signal; Signal B is that the frequency of signal A is revealed; Should signal B be discarded, and temporary before signal C is resumed out as normal working signal, it is invalid to indicate that flag puts.
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| CN108155939A (en) * | 2017-12-19 | 2018-06-12 | 南京典格通信科技有限公司 | Power testing method in a kind of GSM_R digital optical fiber direct stations |
| CN113114325A (en) * | 2021-03-19 | 2021-07-13 | 中国联合网络通信集团有限公司 | Communication method and device |
| CN115412143A (en) * | 2022-08-24 | 2022-11-29 | 金寨天兴通讯科技有限公司 | Relay frequency self-selection method of 5G wireless frequency shift repeater |
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