CN102647385B - Automatic frequency tracking method and automatic frequency tracking device for digital optical-fiber repeater - Google Patents
Automatic frequency tracking method and automatic frequency tracking device for digital optical-fiber repeater Download PDFInfo
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Abstract
The invention relates to an automatic frequency tracking method and an automatic frequency tracking device for a digital optical-fiber repeater. The automatic frequency tracking method comprises the following steps: a) converting an input analog intermediate frequency signal to a digital intermediate frequency signal; b) generating two paths of orthogonal digital carrier signals I and Q used for selecting work frequency points for inputting carrier signals; c) multiplying the digital intermediate frequency signal by signals I and Q generated by a DDS (Direct Digital Synthesizer) and shifting the work frequency points to zero intermediate frequency; and d) carrying out statistical operation on each frequency point to obtain the average power within 1 time slot, carrying out continuous statistical operation on each frequency point in 8 time slots, and selecting the largest average power and storing the average power in an RAM (random access memory). The automatic frequency tracking device for a digital optical-fiber repeater comprises an A/D (analog/digital) conversion module, a DDS mixed-frequency module, a carrier power statistic module, a carrier power RAM and a CPU (Central Processing Unit). Only two multipliers and a small quantity of logical resources are needed in the power statistical algorithm used by the tracking method and the tracking device, so that an FPGA (Field Programmable Gata Array) design resource is saved greatly.
Description
Technical field
The present invention relates to a kind of automatic frequency tracking method and a kind of automatic frequency tracking device, particularly relate to a kind of digital optical fiber direct station automatic frequency tracking method and a kind of digital optical fiber direct station automatic frequency tracking device, belong to mobile communication technology field.
Background technology
Publication number is the Chinese invention patent of CN1801673, disclose a kind of communication repeater system adopting digital intermediate frequency mode, the communication repeater system of this employing digital intermediate frequency mode, be made up of relay and capped end, transmitted by optical fiber settling signal between its relay and capped end, it is characterized in that: the mobile communication downlink radiofrequency signal from base station is admitted to RF module, analog if signal is transformed to after analog down, this analog if signal is admitted to AID switching device, analog if signal is transformed to digital medium-frequency signal, then send into programmable digital down converter DDC to extract, filtering process, complete second time frequency translation, the carrier frequency of digital medium-frequency signal is made to reduce further also and then become baseband signal, this baseband signal is admitted to baseband processing module, by baseband processing module and then the data being packaged into applicable CPRI frame format by 8B/I0B conversion module, these data are by optical transceiver and by optical fiber long-distance transmissions to capped end, at capped end, first programmable digital upconverter DUC is sent into after 8B/I0B conversion module signal being sent into capped end by optical transceiver carries out solution frame by baseband processing module to signal then, baseband signal is passed through filtering, the frequency up-conversion operation such as interpolation are converted to digital intermediate frequency signal, undertaken converting and after the disposal of gentle filter, digital intermediate frequency signal being converted to analog intermediate frequency signal by D/A transformation device again, deliver to antenna after analog intermediate frequency signal being transformed to radiofrequency signal finally by RF module and be transmitted into corresponding overlay area: the course of work of its upward signal is the inverse process of the above-mentioned downstream signal course of work.
Because the management platform of repeater is independent of base station sub-system, its working frequency points must be consistent could effectively work completely with donor base station frequency, and base station will change operating frequency at any time in frequency optimization process.At present for the method for repeater change working frequency points is: by long distance control system manual modification frequency; Part is lost to the repeater of monitoring contact, can only complete and change frequently in the scene of sending someone.Prior art needs for digital optical fibre frequency-selecting repeater is by the problem of manual mode modification frequency, and the outdoor maintenance cost of digital optical fibre frequency-selecting repeater is high.
As shown in Figure 5, a kind of existing technical scheme is: a kind of digital optical fiber direct station automatic frequency tracking device comprises A/D analog-to-digital conversion module, DDC down conversion module, mean effective power detection module, carrier power memory module and CPU module.Analog if signal is obtained digital medium-frequency signal through A/D analog-to-digital conversion by this technical scheme, digital medium-frequency signal realizes frequency-selecting function by DDC down conversion module, the multi-carrier digital intermediate-freuqncy signal being about to input is separated into independently single-carrier signal, then counted the power of each carrier wave by mean effective power detection module, last CPU module filters out the carrier wave used according to each carrier power.The carrier power statistical method of this technical scheme asks for inband signal average power, if band bandwidth is 24MHZ, the average power of then adding up is the power of 24MHZ frequency band intercarrier signal, and other carrier signal filterings must could be counted single-carrier power by this power statistic method exactly.Digital medium-frequency signal carries out filtering through DDC down conversion module, single-carrier signal can be obtained, but the filter in DDC down conversion module needs a large amount of multipliers, and multiplier is the precious resources of taking advantage of of FPGA, the performance requirement that multiplication demand will improve fpga chip in a large number, will cause design cost higher.
The method of current existing select frequency automatically stroke analysis carrier power successively each frequency will be moved on to zero intermediate frequency by DDC, and then use filter by other frequency filterings, last outgoing carrier performance number is:
（1）
Wherein I is in-phase signal, and Q is orthogonal signalling, and n is discrete series summation item number.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, and a kind of reasonable in design is provided, structure is simple, easy to use, safe and reliable, the digital optical fiber direct station automatic frequency tracking device that design cost is low, and a kind of step is few, the digital optical fiber direct station automatic frequency tracking method of reliable results.
The present invention's adopted technical scheme that solves the problem is: a kind of digital optical fiber direct station automatic frequency tracking method, is characterized in: comprise the following steps:
A) analog if signal of input is converted to digital medium-frequency signal;
B) two-way orthogonal digital carrier signal I, Q is produced, for selecting the working frequency points of input carrier signal;
C) digital medium-frequency signal produces with DDS I, Q signal are multiplied, and working frequency points is moved zero intermediate frequency, facilitates accurate statistics carrier power.
D) utilize algorithm to add up the average power of each frequency in 1 time slot, each frequency place adds up 8 time slots continuously, chooses wherein maximum average power and is stored in RAM, utilizing resource few, and statistics power is accurate, and efficiency is high;
E) average power stored in comparison step d, selects 20 maximum frequencies and removes adjacent frequency; Save amount of calculation, get rid of unnecessary frequency.
F) frequency that frequency average power is greater than setting threshold value is chosen; Ensure frequency reliability.
G) frequency list is upgraded.
The present invention by upgrade frequency list and original frequency list contrast, if upgrade frequency list and original frequency list incomplete same, be then equipped with frequency change mark.Improve user to the understanding of frequency changing condition.
In the time interval of the time that certain frequency that inspection of the present invention has been arranged occurs for the last time and current time, if this time interval exceeds the expired time interval of setting, just deleted, and be equipped with the mark of frequency deletion.Contribute to delayed deletion frequency.
If the present invention is a surplus frequency only, then do not delete this frequency.
In step e of the present invention, remove adjacent frequency and refer to, compare the average power content between adjacent frequency, retain the frequency that average power content is maximum.
The present invention's adopted technical scheme that solves the problem is: a kind of digital optical fiber direct station automatic frequency tracking device, is characterized in that: comprise
A/D analog-to-digital conversion module, converts the analog if signal of input to digital medium-frequency signal;
DDS frequency mixing module, DDS produces two-way orthogonal digital carrier signal I, Q, and for selecting the working frequency points of input carrier signal, the I that digital medium-frequency signal produces with DDS, Q signal are multiplied, successively each frequency is moved zero intermediate frequency, use DDS frequency mixing module to save design cost;
Carrier power statistical module, utilize algorithm to add up the average power of each frequency in 1 time slot, each frequency place adds up 8 time slots continuously, saves multiplying amount, raises the efficiency;
Carrier power RAM, chooses average power maximum in each carrier wave 8 time slots, and is stored in carrier power RAM, realize quick storage, facilitates CPU to read the power of current each frequency in real time;
CPU, reads the average power of each frequency from carrier power RAM, the threshold value of this numerical value and CPU setting is compared, and filters out effective frequency.
Described A/D modular converter and the electrical connection of DDS frequency mixing module, described DDS frequency mixing module and the electrical connection of carrier power statistical module, described carrier power statistical module and CPU electrical connection, described carrier power statistical module and carrier power RAM electrical connection, described carrier power RAM and CPU electrical connection.
DDS frequency mixing module of the present invention comprises frequency ROM and DDS unit, and DDS unit reads frequency ROM and stores frequency phase increment, and DDS unit will produce two-way orthogonal digital carrier I, Q signal.
Carrier power statistical module of the present invention and carrier power RAM realize in the programmable logic device, and programmable logic device can be CPLD or FPGA.
CPU module of the present invention is 51 series monolithics or arm processor.
The present invention compared with prior art, have the following advantages and effect: because single-carrier power is the power averaging power in-100khz-+100khz frequency range, it equals the mean value of all frequency power spectrum density summations in carrier wave, for GSM signal, it approximates centre carrier frequency power spectral density.Power spectral density, refers to signal or the noise for having continuous frequency spectrum and limited average power, represents the frequency function of the unit bandwidth power of its spectrum component.And carrier wave has been moved zero intermediate frequency by DDS, namely require that centre carrier frequency power spectrum is exactly the power spectral density asking zero intermediate frequency.And for stable random signal, power spectral density is exactly the Fourier transform of signal auto-correlation function, discrete signal auto-correlation function expression formula is as follows:
（2）
Wherein X (i) is random signal train, and n represents discrete signal variable, then discrete signal powers spectrum density expression formula is as follows:
（3）
Require single-carrier power, then in the hope of zero intermediate frequency power spectral density mean value, can obtain zero intermediate frequency power spectral density expression formula by (3) formula:
（4）
Can draw from (4) formula, by suing for peace to the input signal sequence in certain hour, and then ask its modulus value, then can obtain the power spectral density of zero intermediate frequency, integration time is longer, then average power is more accurate, and it approximates single carrier average power.The power statistic algorithm that the present invention uses only needs 2 multipliers and a small amount of logical resource, greatly saves FPGA and designs resource.
Accompanying drawing explanation
Fig. 1 is the frequency-selecting flow chart of digital optical fiber direct station automatic frequency tracking method of the present invention.
Fig. 2 is the flow chart of the screening frequency of digital optical fiber direct station automatic frequency tracking method of the present invention.
Fig. 3 is the flow chart that digital optical fiber direct station automatic frequency tracking device of the present invention detects frequency change.
Fig. 4 is digital optical fiber direct station automatic frequency tracking apparatus structure schematic diagram of the present invention.
Fig. 5 is the structural representation of prior art of the present invention.
Embodiment
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
As Figure 1-Figure 4.In the present invention, RAM represents random asccess memory, and DDS represents Direct Digital Synthesizer, and CPLD represents CPLD, and FPGA represents field programmable gate array.
First embodiment.
A kind of digital optical fiber direct station automatic frequency tracking method in the present embodiment, comprises the following steps:
A, convert the analog if signal of input to digital medium-frequency signal;
B, DDS produce two-way orthogonal digital carrier signal I, Q, for selecting the working frequency points of input carrier signal;
C, digital medium-frequency signal and DDS are produced the orthogonal digital carrier signal I of two-way, Q signal is multiplied, successively the frequency in frequency band is moved zero intermediate frequency, first can choose a frequency and move zero intermediate frequency, then travel through all frequencies and move zero intermediate frequency;
D, utilize algorithm to add up the average power of each frequency in 1 time slot, each frequency place adds up 8 time slots continuously, chooses wherein maximum average power, and is stored in RAM by this average power and corresponding frequency;
E, select the frequency that in 20 steps d, average power is maximum, remove adjacent frequency; The process removing adjacent frequency is first choose effective current frequency, then the average power between more current frequency and effective adjacent frequency, retains the frequency that maximum average power is larger.Travel through all effective frequencies in passage successively.
In f, selecting step d, average power is greater than the frequency of setting threshold value;
G, upgrade frequency list according to the frequency in step e.
The digital optical fiber direct station automatic frequency tracking method of the present embodiment needs manually to set threshold value before use.
Second embodiment.
Digital optical fiber direct station automatic frequency tracking device for realizing digital optical fiber direct station automatic frequency tracking method in the present embodiment comprises A/D modular converter, DDS frequency mixing module, carrier power statistical module, carrier power RAM and CPU, DDS frequency mixing module and is made up of frequency ROM and DDS unit.
A/D modular converter and the electrical connection of DDS frequency mixing module, DDS frequency mixing module and the electrical connection of carrier power statistical module, carrier power statistical module and CPU electrical connection, carrier power statistical module and carrier power RAM electrical connection, carrier power RAM and CPU electrical connection.Wherein DDS frequency mixing module, carrier power statistical module and carrier power RAM realize in FPGA.
A/D modular converter converts input analog if signal wherein to digital medium-frequency signal.DDS frequency mixing module exports two-way difference 90 degree of I, Q signals, this I, Q signal are multiplied with digital medium-frequency signal, successively each frequency is moved zero intermediate frequency, then the average power of the carrier wave corresponding to each frequency of carrier power statistical module counts in 1 time slot, the average power of continuous statistics 8 time slots, relatively the average power numerical value of these 8 time slots, is stored to maximum average power in carrier power RAM.
CPU reads the average power of the frequency of carrier power RAM, choose the frequency that 20 average powers are maximum, then remove adjacent frequency, then contrast with the threshold value of setting, retain the frequency that average power is greater than threshold value, remove the frequency that average power is less than threshold value.The process removing adjacent frequency is first choose effective current frequency, then the average power between more current frequency and effective adjacent frequency, retains the frequency that average power is larger.Travel through all effective frequencies in passage successively.
The digital optical fiber direct station automatic frequency tracking device of the present embodiment needs manually to set threshold value before use.
3rd embodiment.
The present embodiment supposition only has frequency 1, frequency 2 and frequency 3.A kind of digital optical fiber direct station automatic frequency tracking method in the present embodiment comprises the following steps:
A, convert the analog if signal of input to digital medium-frequency signal.
B, use DDS frequency mixing module produce 3 kinds of I, Q carrier signals, I, Q carrier signal of I, Q carrier signal of frequency 1, I, Q carrier signal of frequency 2 and frequency 3 successively;
C, by I1, Q1 signal multiplication of the digital medium-frequency signal that exports in step a and frequency 1, frequency 1 moved zero intermediate frequency, obtain the zero intermediate frequency signals of frequency 1; By I2, Q2 signal multiplication of the digital medium-frequency signal that exports in step a and frequency 2, frequency 2 moved zero intermediate frequency, obtain the zero intermediate frequency signals of frequency 2; By I3, Q3 signal multiplication of the digital medium-frequency signal that exports in step a and frequency 3, frequency 3 moved zero intermediate frequency, obtain the zero intermediate frequency signals of frequency 3.
The average power of zero intermediate frequency signals in 1 time slot of d, statistics frequency 1, statistics 8 time slots, choose wherein maximum average power, store the information of the maximum average power of this frequency 1 continuously; The average power of zero intermediate frequency signals in 1 time slot of statistics frequency 2, statistics 8 time slots, choose wherein maximum average power, store the information of this frequency 2 maximum average power continuously; The average power of zero intermediate frequency signals in 1 time slot of statistics frequency 3, statistics 8 time slots, choose wherein maximum average power, store the information of this frequency 3 maximum average power continuously.
The maximum frequency of 20 average powers is selected in the information of e, the information of frequency 1 maximum average power stored from steps d, the information of frequency 2 maximum average power and frequency 3 maximum average power.Because the present embodiment only has three frequencies, so three frequencies all retain; Remove adjacent frequency, take out an effective frequency as current frequency (such as, the frequency point number of frequency 1 correspondence is No. 50, the frequency point number of frequency 2 correspondence is No. 49, the frequency point number of frequency 3 correspondence is No. 51), check whether the adjacent frequency (No. 49 and No. 51) of current frequency 1 is effective, if adjacent frequency (such as No. 49 frequencies) is effective frequency, so just check No. 2(49, this adjacent frequency) maximum average power, if it is less than current frequency (No. 50), so just it is labeled as invalid frequency, otherwise then retains.To No. 3(51, another frequency) also do identical inspection and process.The long and is exactly select the frequency in three adjacent frequencies with peak value.If frequency number is four or more than four frequencies, the tabular sequence that then installation prearrangement is good selectes current frequency, can be according to frequency sequence number, from big to small or from small to large, or other order, the result after removing frequency in the present embodiment is only remaining frequency 1.
F, a setting threshold value, the maximum average power of frequency 1 and threshold value are compared, the maximum average power of frequency 1 is greater than threshold value, retains frequency 1.
G, frequency according to the reservation in step f, i.e. frequency 1, upgrades frequency list.
If three frequencies are not adjacent frequencies in step e, so f step process is setting threshold value, and the maximum average power of frequency 1 and threshold value are compared, the maximum average power of frequency 1 is greater than threshold value, retains frequency 1; The maximum average power of frequency 2 and threshold value are compared, the maximum average power of frequency 2 is less than threshold value, removes frequency 2; The maximum average power of frequency 3 compared, the maximum average power of frequency 3 is greater than threshold value, retains frequency 3.
4th embodiment.
Digital optical fiber direct station automatic frequency tracking device for realizing digital optical fiber direct station automatic frequency tracking method in the present embodiment comprises A/D modular converter, DDS frequency mixing module, carrier power statistical module, carrier power RAM and CPU, DDS frequency mixing module and is made up of frequency ROM and DDS unit.
A/D modular converter and the electrical connection of DDS frequency mixing module, DDS frequency mixing module and the electrical connection of carrier power statistical module, carrier power statistical module and CPU electrical connection, carrier power statistical module and carrier power RAM electrical connection, carrier power RAM and CPU electrical connection.DDS frequency mixing module, carrier power statistical module and carrier power RAM realize in FPGA.
The present embodiment supposition only detects frequency 1, frequency 2 and frequency 3.The digital optical fiber direct station automatic frequency tracking device course of work in the present embodiment is as follows:
Analog if signal input A/D modular converter, A/D modular converter exports digital medium-frequency signal.
Frequency ROM stores the phase increment of each frequency in passband, and the present embodiment intermediate-frequeney point ROM stores the phase increment of frequency 1, frequency 2 and frequency 3.
When DDS frequency mixing module receives frequency selection instruction, the phase increment that frequency ROM reads frequency 1 correspondence sends into DDS unit; DDS unit will export I1, Q1 signal of two-way difference 90 degree; I1, Q1 signal that DDS produces and A/D modular converter export digital medium-frequency signal and are multiplied, and frequency 1 is moved zero intermediate frequency, and sends the signal after moving to carrier power statistical module.Add up the average power of the carrier wave of frequency 1 in 1 time slot, the average power of statistics 8 time slots, obtains maximum average power more afterwards, the maximum average power of the carrier wave of this frequency 1 is sent in carrier power RAM and stores continuously.
Frequency ROM reads frequency 2 phase increment and sends into DDS unit.DDS unit will export I2, Q2 signal of two-way difference 90 degree; I2, Q2 signal that DDS produces and A/D modular converter export digital medium-frequency signal and are multiplied, and send signal to carrier power statistical module.Add up the average power of the carrier wave of frequency 2 in 1 time slot, the average power of statistics 8 time slots, obtains maximum average power more afterwards, the maximum average power of the carrier wave of this frequency 2 is sent in carrier power RAM and stores continuously.
Frequency ROM reads frequency 3 phase increment and sends into DDS unit.DDS unit will export I3, Q3 signal of two-way difference 90 degree; I3, Q3 signal that DDS produces and A/D modular converter export digital medium-frequency signal and are multiplied, and send signal to carrier power statistical module.Add up the average power of the carrier wave of frequency 3 in 1 time slot, the average power of statistics 8 time slots, obtains maximum average power more afterwards, the maximum average power of the carrier wave of this frequency 3 is sent in carrier power RAM and stores continuously.The present embodiment does not remove adjacent frequency.
CPU chooses 20 maximum frequencies of average power, chooses frequency 1, frequency 2 and frequency 3 in the present embodiment.
CPU reads the maximum average power of carrier power RAM intermediate-frequeney point 1, and the maximum average power of this frequency 1 compared with the threshold value of setting, the maximum average power of frequency 1 is less than threshold value, removes frequency 1.
CPU reads the maximum average power of carrier power RAM intermediate-frequeney point 2, and the maximum average power of this frequency 2 compared with the threshold value of setting, the maximum average power of frequency 2 is greater than threshold value, retains frequency 2.
CPU reads the maximum average power of carrier power RAM intermediate-frequeney point 3, and the maximum average power of this frequency 3 compared with the threshold value of setting, the maximum average power of frequency 2 is greater than threshold value, retains frequency 3.
CPU upgrades frequency list.
A/D modular converter of the present invention also can be called A/D analog-to-digital conversion module.
Above content described in this specification is only made for the present invention illustrating.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from the content of specification of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (8)
1. a digital optical fiber direct station automatic frequency tracking method, is characterized in that: comprise the following steps:
A) analog if signal of input is converted to digital medium-frequency signal;
B) two-way orthogonal digital carrier signal I, Q is produced, for selecting the working frequency points of input carrier signal;
C) digital medium-frequency signal produces with DDS I, Q signal are multiplied, and working frequency points is moved zero intermediate frequency; DDS represents Direct Digital Synthesizer;
D) utilize algorithm to add up the average power of each frequency in 1 time slot, each frequency place adds up 8 time slots continuously, chooses maximum average power and is stored in RAM; RAM represents random asccess memory;
E) comparison step d) in the average power that stores, select 20 maximum frequencies and remove adjacent frequency; The process removing adjacent frequency is first choose effective current frequency, then the average power between more current frequency and effective adjacent frequency, retains the frequency that maximum average power is larger; Travel through all effective frequencies in passage successively;
F) frequency that frequency average power is greater than the threshold value of setting is chosen;
G) frequency list is upgraded.
2. digital optical fiber direct station automatic frequency tracking method according to claim 1, it is characterized in that: the frequency list upgraded and original frequency list are contrasted, if frequency list and the original frequency list of renewal are incomplete same, be then equipped with the mark of frequency change.
3. digital optical fiber direct station automatic frequency tracking method according to claim 1 and 2, it is characterized in that: the time interval checking the time that certain frequency arranged occurs for the last time and current time, if this time interval exceeds the expired time interval of setting, just deleted, and be equipped with the mark of frequency deletion.
4. digital optical fiber direct station automatic frequency tracking method according to claim 3, is characterized in that: if only remain a frequency, then do not delete this frequency.
5. a digital optical fiber direct station automatic frequency tracking device, is characterized in that: comprise
A/D modular converter, converts the analog if signal of input to digital medium-frequency signal;
DDS frequency mixing module, DDS produces two-way orthogonal digital carrier signal I, Q, and for selecting the working frequency points of input carrier signal, the I that digital medium-frequency signal produces with DDS, Q signal are multiplied, and successively each frequency are moved zero intermediate frequency;
Carrier power statistical module, utilize algorithm to add up the average power of each frequency in 1 time slot, each frequency place adds up 8 time slots continuously; DDS represents Direct Digital Synthesizer;
Carrier power RAM, chooses average power maximum in each carrier wave 8 time slots, and is stored in carrier power RAM; RAM represents random asccess memory;
CPU, reads the average power of each frequency from carrier power RAM, the threshold value of this average power and CPU setting is compared, and filters out effective frequency; Described A/D modular converter and the electrical connection of DDS frequency mixing module, described DDS frequency mixing module and the electrical connection of carrier power statistical module, described carrier power statistical module and CPU electrical connection, described carrier power statistical module and carrier power RAM electrical connection, described carrier power RAM and CPU electrical connection.
6. digital optical fiber direct station automatic frequency tracking device according to claim 5, it is characterized in that: described DDS frequency mixing module comprises frequency ROM and DDS unit, DDS unit reads the frequency phase increment that frequency ROM stores, and DDS unit will produce two-way orthogonal digital carrier I, Q signal.
7. digital optical fiber direct station automatic frequency tracking device according to claim 5, is characterized in that: described carrier power statistical module and carrier power RAM realize in the programmable logic device, and programmable logic device is CPLD or FPGA.
8. digital optical fiber direct station automatic frequency tracking device according to claim 5, is characterized in that: described CPU module is 51 series monolithics or arm processor.
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| CN107197471A (en) * | 2017-05-25 | 2017-09-22 | 京信通信系统（中国）有限公司 | A kind of repeater business statistical method and device |
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| 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 |
| CN101488795A (en) * | 2009-01-08 | 2009-07-22 | 福建邮科通信技术有限公司 | Optical fiber digital transmission method applied on straight-forward station |
| CN102368867A (en) * | 2011-11-16 | 2012-03-07 | 三维通信股份有限公司 | Automatic frequency-selecting GSM (Global System for Mobile Communication) digital optical fiber repeater and realizing method thereof |
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