CN117896003A - Digital optical fiber repeater for GSM-R multi-carrier combined technology - Google Patents
Digital optical fiber repeater for GSM-R multi-carrier combined technology Download PDFInfo
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Abstract
The invention discloses a digital optical fiber repeater for GSM-R multi-carrier combination technology, comprising: the base station connected with the optical fiber repeater comprises a main remote radio unit and a standby remote radio unit, and outputs a first RRU signal and a second RRU signal respectively; the repeater near-end machine is characterized by comprising: the device comprises a first duplexer, a second duplexer, a first power divider, a second power divider, a first combiner, a second combiner, a master digital processing unit and a slave digital processing unit; the first duplexer and the second duplexer are provided with a public end, a signal output end and a signal input end; the first power divider and the second power divider form a signal separator, and the first RRU signal is divided into two paths by the signal separator and is respectively input into one input end of the master digital processing unit and one input end of the slave digital processing unit; the second RRU signal is divided into two paths by a signal separator and is respectively input into the other input ends of the main digital processing unit and the auxiliary digital processing unit.
Description
Technical Field
The invention relates to the technical field of railway communication systems, in particular to a design method of a GSM-R multi-carrier combined technology digital optical fiber repeater.
Background
For the GSM-R base station, when the optical fiber repeater is used for covering a weak field, the conventional connection scheme is to connect the A ports of the main RRU (Remote Radio Unit-remote radio unit) and the standby RRU (Remote Radio Unit-remote radio unit) output by the base station to the main path of the coupler and then connect the coupling port to the radio frequency port of the near-end machine of the repeater. After the downlink signal enters the repeater, the frequency separation is carried out through the diplexer, one path of signal is output by the two diplexers and enters two same-side ports of the 3dB bridge, and the 3dB bridge combines the signals and then divides the signals, and then the signals are transmitted to the digital intermediate frequency processing board.
If the base station is a conventional base station which does not support the multi-carrier combined technology, the frequency point output by the two RRUs is a main output BCCH signal (broadcast control channel Broadcast Control Channel), and the carrier frequency point is f1; and (3) outputting a TCH signal, wherein the carrier frequency point is f2. After the two paths of signals enter the near-end machine of the repeater, the two paths of signals are combined in the bridge and then are divided into a main digital intermediate frequency board and a standby digital intermediate frequency board. At this time, f1 is not equal to f2, so that the signals of different-frequency combining power division do not interfere with each other, the signal amplitude is stable, and the downlink function of the repeater is normal.
In a Railway integrated digital mobile communication system (Global System for Mobile Communications-Railway, abbreviated as GSM-R), when an optical fiber repeater is connected to a base station system adopting a multi-carrier combined technology, signals output by two RRUs all comprise BCCH and TCH, namely carrier frequency points of the signals are f1+f2, the phase difference existing in the two paths of signals is recorded as delta phi, after the two paths of signals are combined by an electric bridge, the output signals are identical-frequency signals, the phase difference exists between the two paths of downlink identical-frequency signals, and the phase difference is uncertain. The amplitude of the combined signal output to the subsequent unit is unequal, so that the repeater system cannot work normally. The problem is easy to cause downlink abnormality, affects GSM-R signal coverage between repeater stations, further causes abnormal conversation and data, and even affects system scheduling when serious, thereby causing driving safety accidents.
The current solution to this problem is mainly:
1. and adjusting the time delay of the base station side. The phase difference of the output signals is adjusted by adjusting the time delay deviation parameter of the carrier frequency plate in the BBU, so that the output signals are aligned in the time domain, namely delta phi=0 as much as possible.
2. The coupler is replaced. By using two paths of couplers with different coupling values (for example, one path uses a 40dB coupler and the other path uses a 30dB coupler), the amplitude difference of two paths of signals is artificially increased, so that the signal output by the bridge is mainly determined by the path of coupling signal with larger power.
The 1 st solution has the following disadvantages:
firstly, even if the delay value is adjusted at the base station side to align two paths of signals, after the signals pass through the bridge combiner, the phases of the signals are different when the signals are combined at the two output ports due to different transmission paths in the combiner, and finally the amplitudes of the two combined signals are inconsistent.
Secondly, because of the design problem of a base station manufacturer, the time delay of two paths of carrier frequency plate signals is poor, the phase after each reset is changed compared with that before the reset, so that the time delay alignment adjustment is complicated, and each power-on is required to be readjusted.
The disadvantage of scheme 2 is: essentially equivalent to using one of the two signals, i.e. the signal with the larger coupling degree (smaller coupling value) of the coupler, has larger power. Assuming that the main RRU is connected with a 30dB coupler and the standby RRU is connected with a 40dB coupler under the premise of the same transmitting power, the combined main RRU signal is dominant. In this way, the two carrier frequency boards of the base station are only valid in the normal operation (with smaller attenuator value), thereby causing the redundant functions of the main RRU, the standby RRU and the repeater of the base station to be invalid. Once the main circuit fails, the downlink gain of the repeater is abnormal (the downlink gain is smaller than that of the repeater), the normal coverage area of the road network signal is affected, and the situations such as call drop, packet loss or switching failure are caused.
In summary, the 1 st scheme cannot thoroughly solve the problem of mutual interference of the multi-carrier combining, while the 2 nd scheme can avoid the uncertainty of the combining interference, but brings other problems and hidden troubles.
Disclosure of Invention
According to the problems of the prior art, the present invention provides a digital optical fiber repeater for GSM-R multi-carrier combining technology, the digital optical fiber repeater comprising: the base station connected with the optical fiber repeater comprises a main remote radio unit and a standby remote radio unit, wherein the main remote radio unit outputs a first RRU signal, and the standby remote radio unit outputs a second RRU signal; the repeater near-end machine comprises: the device comprises a first duplexer, a second duplexer, a first power divider, a second power divider, a first combiner, a second combiner, a master digital processing unit and a slave digital processing unit;
the first duplexer and the second duplexer are provided with a public end, a signal output end and a signal input end;
the first power divider and the second power divider form a signal separator, and the first RRU signal is divided into two paths by the signal separator and is respectively input into one input end of the master digital processing unit and one input end of the slave digital processing unit; the second RRU signal is divided into two paths by the signal separator and is respectively input into the other input ends of the main digital processing unit and the auxiliary digital processing unit.
According to the digital optical fiber repeater disclosed by the invention, the first power divider and the second power divider are one-to-two power dividers, and each one-to-two power divider is provided with an input end and two output ends;
the signal output end of the first duplexer is connected to the input end of the first power divider, and the signal output end of the second duplexer is connected to the input end of the second power divider.
According to the digital optical fiber repeater disclosed by the invention, a first RRU signal is divided into two paths by the first power divider, one path of the signal is input to a first receiving end of a main digital processing unit, and the other path of the signal is input to a first receiving end of a slave digital processing unit;
the second RRU signal is divided into two paths by the second power divider, one path is input to the second receiving end of the master digital processing unit, and the other path is input to the second receiving end of the slave digital processing unit.
According to the digital optical fiber repeater disclosed by the invention, the first combiner and the second combiner are two-in-one power combiners, and each two-in-one power combiner is provided with two input ends and one output end;
the master digital processing unit and the slave digital processing unit are provided with two output ends: a first output terminal and a second output terminal;
the first output end of the main digital processing unit is connected to one input end of the first combiner; the first output end of the slave digital processing unit is connected to the other input end of the first combiner;
the second output end of the main digital processing unit is connected to one input end of the second combiner, and the output signal of the second output end of the auxiliary digital processing unit is connected to the other input end of the second combiner.
According to the digital optical fiber repeater, the output end of the first combiner is connected to the signal input end of the first duplexer, and the output end of the second combiner is connected to the signal input end of the second duplexer.
According to the digital optical fiber repeater of the present invention, the main digital processing unit includes: the device comprises a radio frequency processing unit, an intermediate frequency preprocessing unit and an intermediate frequency baseband processing unit;
the radio frequency processing unit comprises: a local oscillator, a mixer, a band-pass filter and an analog-to-digital converter;
the intermediate frequency preprocessing unit comprises: the device comprises a digital detection unit, an arbitration control unit, a signal synthesizer unit and a channel selection unit;
the structure of the slave digital processing unit is the same as that of the master digital processing unit.
According to the digital optical fiber repeater of the present invention, the radio frequency processing unit comprises: the first mixer, the first band-pass filter and the first analog-to-digital converter are connected in sequence; the first path of radio frequency signals and local oscillation signals of the local oscillator are injected into a first mixer at the same time to carry out mixing;
the radio frequency processing unit further comprises: the second mixer, the second band-pass filter and the second analog-digital converter are connected in sequence; the second radio frequency signal and the local oscillator signal of the local oscillator are injected into the second mixer at the same time to perform mixing.
According to the digital optical fiber repeater, the first analog-digital converter and the second analog-digital converter respectively generate a first digital intermediate frequency signal and a second digital intermediate frequency signal;
the signal synthesizer adds the first digital intermediate frequency signal and the second digital intermediate frequency signal to output a mixed digital intermediate frequency signal;
the first digital intermediate frequency signal, the second digital intermediate frequency signal and the mixed digital intermediate frequency signal are respectively input into one input end of the channel selection unit; the channel selection unit outputs one signal of the first digital intermediate frequency signal, the second digital intermediate frequency signal and the mixed digital intermediate frequency signal according to the mode selection instruction of the arbitration control unit.
According to the digital optical fiber repeater, the first digital intermediate frequency signal and the second digital intermediate frequency signal are input into a digital detection unit; the digital detection unit generates the power statistical result of the first digital intermediate frequency signal and the second digital intermediate frequency signal and sends the power statistical result to the arbitration control unit in real time.
According to the digital optical fiber repeater, the arbitration control unit receives the superior selection signal to determine the working mode of the digital processing unit, wherein the working mode comprises the following steps: the upper computer designates a mode, a power selecting mode and a combining mode; in the power selection mode, the arbitration control unit receives the power statistical result and selects one path of digital intermediate frequency signal with high power to output;
in the upper computer appointed mode, according to an upper selection signal, a first digital intermediate frequency signal or a second digital intermediate frequency signal is fixedly selected to be output as a digital intermediate frequency signal;
and in the combining mode, adding the first digital intermediate frequency signal and the second digital intermediate frequency signal and outputting the added signals as digital intermediate frequency signals.
The method of the invention has the following advantages: the problem of poor compatibility of the existing repeater to the base station of the multi-carrier combined technology is thoroughly solved. The scheme does not need to make any additional setting modification to the base station, and does not need to add or modify any external radio frequency component/unit; the normal operation of the existing service is not affected, and the redundant function of the base station/repeater is not sacrificed. The scheme adopts the design thought of the software radio, the analog signals are selected by the software domain after being digitized, the scheme is flexible and efficient, can solve the existing problems, can well support the base station of the non-multi-carrier combined technology, and is suitable for being applied to the use scenes of all repeater stations
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
Fig. 1 is a partial frame diagram of a near-end machine of a GSM-R multi-carrier combined technology digital fiber optic repeater of the present invention.
Fig. 2 is a schematic diagram of a part of the circuit inside the digital processing unit of the near-end machine according to the present invention.
Fig. 3 is an electrical schematic diagram of another portion of the circuitry within the digital processing unit of the present invention.
Fig. 4 is a diagram of a GSM-R multi-carrier combined technology digital optical fiber repeater according to the present invention.
Wherein: 1. the device comprises a first mixer, a second mixer, a first intermediate frequency filter, a second intermediate frequency filter, a first analog-digital converter, a second analog-digital converter, a signal synthesizer, a selector, a digital detector and an arbitration control unit, wherein the first mixer, the second mixer, the first intermediate frequency filter, the second intermediate frequency filter, the first analog-digital converter, the second analog-digital converter, the signal synthesizer, the selector, the signal synthesizer and the arbitration control unit.
Detailed Description
The invention is based on improving the internal design of the repeater system, and can realize the complete support of the base station with multi-carrier technology without adopting methods of adjusting the parameters of the base station or externally connecting different couplers, attenuators and the like. On the premise of not changing the basic function of the repeater, the characteristics and advantages of digitization are fully utilized, the processes of signal selection, combining, power and the like are moved to an intermediate frequency digital domain, the radio technology of software is applied, and the system is controlled by using a software idea. The method can effectively reduce and simplify the use of units such as radio frequency circuits in the repeater, particularly power splitters, combiners and the like, and enables the repeater to be more flexible and intelligent (such as functions of newly added modes/channel selection and the like, and gives control rights to a central control or network management upper computer), thereby supporting base stations with different functions/types more comprehensively.
A complete repeater system block diagram is shown in figure 4,
the near-end machine consists of a digital processing unit (master and slave) and a digital optical module, a duplexer, a two-power divider, a central control board, a main power supply module and a standby power supply module. The two paths of downlink signals output by the base station respectively enter the duplexer from the ANT1 and the ANT2 of the near-end machine, and are output to the two power dividers after passing through the duplexer, the two power dividers divide the signals into two paths, and the signals respectively enter the radio frequency receiving ports RX1 and RX2 of the master digital processing unit and the slave digital processing unit. In the digital processing unit, 930-934MHz radio frequency signals are converted into intermediate frequency analog signals through amplification, mixing, filtering and the like, and then converted and sampled by an analog-to-digital converter (ADC) to obtain intermediate frequency digital signals with the bandwidth of 100 MHz. The signal is preprocessed by the intermediate frequency to obtain a final downlink intermediate frequency digital signal in the current working mode, then processed by the intermediate frequency-baseband module, finally converted into high-speed serial data, packaged and sent to the digital optical module in a common wireless interface protocol (Common Public Radio Interface, CPRI for short) format, and then transmitted to the remote terminal through the optical fiber.
The remote terminal consists of a main digital processing unit, a secondary digital processing unit, a digital optical module, a duplexer, a two-power divider, a 3dB bridge, a main set low-noise amplifier, a diversity low-noise amplifier, a main power amplifier, a standby power amplifier, a central control board, a main power module, a standby power module and a movable ring control board. After receiving the downlink high-speed serial data, the remote terminal unpacks according to CPRI protocol format to obtain a downlink digital baseband signal, then the downlink digital baseband signal is processed by baseband-intermediate frequency to obtain a digital intermediate frequency signal, the digital intermediate frequency signal is converted into an intermediate frequency analog signal by a digital-to-analog converter (DAC), and then the intermediate frequency analog signal is recovered into a radio frequency analog signal of 930-934MHz after being processed by filtering, mixing, amplifying and the like. The signal is amplified by the current working power amplifier and then output to the duplexer, and is divided into two paths of signals by the 3dB bridge at the output port and output to the feeder line, and the signals are converted into space electromagnetic waves by the feeder line to the leaky cable or the antenna and finally received by the terminal antenna.
For the uplink channel, the uplink signal of 885-889MHz is transmitted by the antenna of the terminal and then enters the far-end machine through the space to the leaky cable or the antenna, and enters the digital processing unit through the 3dB bridge, the duplexer, the low noise amplifier, the power divider and other modules, the processing procedure of the digital processing unit is similar to the downlink signal processing and transmission flow, and finally, the digital processing unit of the near-end machine recovers the radio frequency signal, and the radio frequency signal is transmitted to the base station coupler for receiving after passing through the power divider and the duplexer. The technical solution of the present invention will be clearly and completely described in conjunction with the specific embodiments, but it should be understood by those skilled in the art that the embodiments described below are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on the embodiments of the present invention, are within the scope of the present invention.
Fig. 1 is a partial frame diagram of a near-end machine of a digital optical fiber repeater of the GSM-R multi-carrier combined technology according to the invention.
Example 1
A digital fiber optic repeater for use in a GSM-R multi-carrier joint technology, said digital fiber optic repeater comprising: the base station connected with the optical fiber repeater comprises a main remote radio unit and a standby remote radio unit, wherein the main remote radio unit outputs a first RRU signal, and the standby remote radio unit outputs a second RRU signal; the repeater near-end machine comprises: the device comprises a first duplexer, a second duplexer, a first power divider, a second power divider, a first combiner, a second combiner, a master digital processing unit and a slave digital processing unit;
the first duplexer and the second duplexer are provided with a public end, a signal output end and a signal input end;
the first power divider and the second power divider form a signal separator, and the first RRU signal is divided into two paths by the signal separator and is respectively input into one input end of the master digital processing unit and one input end of the slave digital processing unit; the second RRU signal is divided into two paths by the signal separator and is respectively input into the other input ends of the main digital processing unit and the auxiliary digital processing unit.
The invention changes the 3dB bridge used for the downlink signal combining/branching in the technical scheme of the prior near-end machine into two-input-output power dividers. The junction ports of the two power splitters are respectively connected with the downlink ports of the two diplexers, and the signals after power splitting are respectively connected to the radio frequency signal input ports RX1/RX2 of the master/slave digital processing units.
Compared with the original near-end machine design, the scheme cancels the radio frequency combining setting of a downlink channel, so that signals from the main/standby RRUs of the base station are respectively accessed into the digital processing unit through RX1 and RX2 ports of the intermediate frequency unit.
According to the digital optical fiber repeater disclosed by the invention, the first power divider and the second power divider are one-to-two power dividers, and each one-to-two power divider is provided with an input end and two output ends;
the signal output end of the first duplexer is connected to the input end of the first power divider, and the signal output end of the second duplexer is connected to the input end of the second power divider.
According to the digital optical fiber repeater disclosed by the invention, a first RRU signal is divided into two paths by the first power divider, one path of the signal is input to a first receiving end of a main digital processing unit, and the other path of the signal is input to a first receiving end of a slave digital processing unit;
the second RRU signal is divided into two paths by the second power divider, one path is input to the second receiving end of the master digital processing unit, and the other path is input to the second receiving end of the slave digital processing unit.
According to the digital optical fiber repeater disclosed by the invention, the first combiner and the second combiner are two-in-one power combiners, and each two-in-one power combiner is provided with two input ends and one output end;
the master digital processing unit and the slave digital processing unit are provided with two output ends: a first output terminal and a second output terminal;
the first output end of the main digital processing unit is connected to one input end of the first combiner; the first output end of the slave digital processing unit is connected to the other input end of the first combiner;
the second output end of the main digital processing unit is connected to one input end of the second combiner, and the output signal of the second output end of the auxiliary digital processing unit is connected to the other input end of the second combiner.
According to the digital optical fiber repeater, the output end of the first combiner is connected to the signal input end of the first duplexer, and the output end of the second combiner is connected to the signal input end of the second duplexer.
Example 2
The internal processing block diagram of the digital processing unit of the near-end machine of the present invention is shown in fig. 2 and 3.
According to the digital optical fiber repeater of the present invention, the digital processing unit of the near-end machine comprises: the device comprises a radio frequency processing unit, an intermediate frequency preprocessing unit and an intermediate frequency baseband processing unit;
the radio frequency processing unit comprises: a local oscillator (intermediate frequency local oscillator), a first mixer 1, a second mixer 2, a first intermediate frequency filter 3, a second intermediate frequency filter 4, a first analog-to-digital converter 5, and a second analog-to-digital converter 6.
The intermediate frequency preprocessing unit comprises: a signal synthesizer 7, a selector 8, a digital detector 9, and an arbitration control unit 10.
According to the digital optical fiber repeater of the present invention, the radio frequency processing unit comprises: the first mixer 1, the first intermediate frequency filter 3 and the first analog-digital converter 5 are connected in sequence. The first path of radio frequency signal and the local oscillation signal output by the local oscillator are injected into the first mixer 1 at the same time to perform mixing. The radio frequency component is filtered by the first intermediate frequency filter 3, and the first analog-digital converter 5 performs analog-digital conversion to generate a first path of digital intermediate frequency signal (CH 1) for output.
The radio frequency processing unit further comprises: a second mixer 2, a second intermediate frequency filter 4 and a second analog-digital converter 6 which are connected in sequence. The second path of radio frequency signals and the output local oscillation signals are injected into a second mixer to perform frequency mixing at the same time, radio frequency components are filtered by a second intermediate frequency filter 4, and the second analogue-digital converter 6 performs analogue-digital conversion to generate a second path of digital intermediate frequency signals (CH 2) to output.
According to the digital optical fiber repeater, the first analog-digital converter and the second analog-digital converter respectively generate a first digital intermediate frequency signal and a second digital intermediate frequency signal;
the signal synthesizer adds the first digital intermediate frequency signal and the second digital intermediate frequency signal to output a mixed digital intermediate frequency signal;
the first digital intermediate frequency signal, the second digital intermediate frequency signal and the mixed digital intermediate frequency signal are respectively input into one input end of the channel selection unit; the selector 8 outputs one of the first digital intermediate frequency signal, the second digital intermediate frequency signal and the mixed digital intermediate frequency signal according to a mode selection instruction output by the arbitration control unit 10.
According to the digital optical fiber repeater, the first digital intermediate frequency signal and the second digital intermediate frequency signal are input into a digital detection unit; the digital detection unit generates the power statistics of the first digital intermediate frequency signal and the second digital intermediate frequency signal and sends the power statistics to the arbitration control unit 10 in real time.
In the digital optical fiber repeater according to the present invention, the arbitration control unit 10 receives the upper selection signal to determine the operation mode of the digital processing unit, where the operation mode includes: the upper computer designates a mode, a power selecting mode and a combining mode; and in the power selection mode, the arbitration control unit receives the power statistical result and selects one path of digital intermediate frequency signal with high power to output.
In the near-end machine, the digital processing unit (downlink) is mainly divided into three parts of radio frequency processing, intermediate frequency preprocessing and intermediate frequency-baseband processing, the specific functions and implementation scheme of the digital processing unit are described in detail as follows, the radio frequency processing part consists of a two-channel radio frequency receiving circuit, an input downlink signal is mixed with a local oscillator, then the radio frequency is filtered through an intermediate frequency filter, and the radio frequency is converted into a first digital intermediate frequency signal and a second digital intermediate frequency signal through an ADC (analog-to-digital converter).
The intermediate frequency preprocessing part is formed by combining functional units such as detection calculation, arbitration control, channel selection, signal synthesizer, related clocks and the like, and the circuit connection relation is shown in figure 2.
The first digital intermediate frequency signal and the second digital intermediate frequency signal enter a digital detection unit, and the unit sends the power statistical results of the two paths to an arbitration control unit in real time.
The arbitration control unit determines the operating mechanism of the unit according to the requirements of the upper selection signal.
The unit may support the following three modes of operation:
1. the upper computer designates a mode, and fixedly selects a first digital intermediate frequency signal and a second digital intermediate frequency signal as final output;
2. a power selection strong mode, wherein one path with high power is selected as output according to the power of the first digital intermediate frequency signal and the second digital intermediate frequency signal;
3. and a combining mode, wherein the first digital intermediate frequency signal and the second digital intermediate frequency signal are added and then output.
The mode 1 and the mode 2 are suitable for the multi-carrier combined base station system, the first digital intermediate frequency signal and the second digital intermediate frequency signal are output according to different modes selected by the upper computer instruction, and the mode 3 is suitable for the non-multi-carrier combined base station system. The selection of channels for modes 1 and 3 is determined entirely by the upper computer control word. When the mode 2 is selected, the arbitration control unit judges the power according to the output of the digital detection unit, and selects a signal which has larger current power and is at least 3dB larger than the other path as the output, and if the two paths of power are equal or have a phase difference of less than 3dB, the channel 1 is selected as the output by default.
The intermediate frequency-baseband processing part receives an intermediate frequency output signal from a front stage, performs digital down conversion, multichannel filtering, local-CPRI data conversion and CPRI framing on the intermediate frequency output signal, and finally converts a data packet of the signal and the transparent transmission data into high-speed serial data through the high-speed parallel-serial data conversion module and outputs the high-speed serial data to the digital optical module. The digital down conversion, multi-channel filtering, data protocol conversion and other modules are controlled by corresponding parameters in the local register set.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (10)
1. A digital fiber optic repeater for use in a GSM-R multi-carrier joint technology, said digital fiber optic repeater comprising: the base station connected with the optical fiber repeater comprises a main remote radio unit and a standby remote radio unit, wherein the main remote radio unit outputs a first RRU signal, and the standby remote radio unit outputs a second RRU signal; the repeater near-end machine is characterized by comprising: the device comprises a first duplexer, a second duplexer, a first power divider, a second power divider, a first combiner, a second combiner, a master digital processing unit and a slave digital processing unit;
the first duplexer and the second duplexer are provided with a public end, a signal output end and a signal input end;
the first power divider and the second power divider form a signal separator, and the first RRU signal is divided into two paths by the signal separator and is respectively input into one input end of the master digital processing unit and one input end of the slave digital processing unit; the second RRU signal is divided into two paths by the signal separator and is respectively input into the other input ends of the main digital processing unit and the auxiliary digital processing unit.
2. The digital optical fiber repeater of claim 1, wherein the first power divider and the second power divider are one-to-two power dividers, each having an input and two outputs;
the signal output end of the first duplexer is connected to the input end of the first power divider, and the signal output end of the second duplexer is connected to the input end of the second power divider.
3. The digital optical fiber repeater according to claim 2, wherein the first RRU signal is split by the first power splitter into two paths, one path being input to the first receiving end of the master digital processing unit and the other path being input to the first receiving end of the slave digital processing unit;
the second RRU signal is divided into two paths by the second power divider, one path is input to the second receiving end of the master digital processing unit, and the other path is input to the second receiving end of the slave digital processing unit.
4. The digital optical fiber repeater of claim 1, wherein the first combiner and the second combiner are two-in-one power combiners, each of the two-in-one power combiners having two inputs and one output;
the master digital processing unit and the slave digital processing unit are provided with two output ends: a first output terminal and a second output terminal;
the first output end of the main digital processing unit is connected to one input end of the first combiner; the first output end of the slave digital processing unit is connected to the other input end of the first combiner;
the second output end of the main digital processing unit is connected to one input end of the second combiner, and the output signal of the second output end of the auxiliary digital processing unit is connected to the other input end of the second combiner.
5. The digital optical fiber repeater according to claim 4, wherein the output terminal of the first combiner is connected to the signal input terminal of the first duplexer, and the output terminal of the second combiner is connected to the signal input terminal of the second duplexer.
6. The digital fiber optic repeater of claim 1, wherein the main digital processing unit comprises: the device comprises a radio frequency processing unit, an intermediate frequency preprocessing unit and an intermediate frequency baseband processing unit;
the radio frequency processing unit comprises: a local oscillator, a mixer, a band-pass filter and an analog-to-digital converter;
the intermediate frequency preprocessing unit comprises: the device comprises a digital detection unit, an arbitration control unit, a signal synthesizer unit and a channel selection unit;
the structure of the slave digital processing unit is the same as that of the master digital processing unit.
7. The digital optical fiber repeater according to claim 6, wherein the radio frequency processing unit comprises: the first mixer, the first band-pass filter and the first analog-to-digital converter are connected in sequence; the first path of radio frequency signals and local oscillation signals of the local oscillator are injected into a first mixer at the same time to carry out mixing;
the radio frequency processing unit further comprises: the second mixer, the second band-pass filter and the second analog-digital converter are connected in sequence; the second radio frequency signal and the local oscillator signal of the local oscillator are injected into the second mixer at the same time to perform mixing.
8. The digital fiber optic repeater according to claim 7, wherein the first and second analog-to-digital converters generate first and second digital intermediate frequency signals, respectively;
the signal synthesizer adds the first digital intermediate frequency signal and the second digital intermediate frequency signal to output a mixed digital intermediate frequency signal;
the first digital intermediate frequency signal, the second digital intermediate frequency signal and the mixed digital intermediate frequency signal are respectively input into one input end of the channel selection unit; the channel selection unit outputs one signal of the first digital intermediate frequency signal, the second digital intermediate frequency signal and the mixed digital intermediate frequency signal according to the mode selection instruction of the arbitration control unit.
9. The digital optical fiber repeater according to claim 8, wherein the first digital intermediate frequency signal and the second digital intermediate frequency signal are input to a digital detection unit; the digital detection unit generates the power statistical result of the first digital intermediate frequency signal and the second digital intermediate frequency signal and sends the power statistical result to the arbitration control unit in real time.
10. The digital optical fiber repeater according to claim 9, wherein the arbitration control unit receives the upper level selection signal to determine an operation mode of the digital processing unit, the operation mode comprising: the upper computer designates a mode, a power selecting mode and a combining mode; in the power selection mode, the arbitration control unit receives the power statistical result and selects one path of digital intermediate frequency signal with high power to output;
in the upper computer appointed mode, according to an upper selection signal, a first digital intermediate frequency signal or a second digital intermediate frequency signal is fixedly selected to be output as a digital intermediate frequency signal;
and in the combining mode, adding the first digital intermediate frequency signal and the second digital intermediate frequency signal and outputting the added signals as digital intermediate frequency signals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410245671.8A CN117896003A (en) | 2024-03-05 | 2024-03-05 | Digital optical fiber repeater for GSM-R multi-carrier combined technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410245671.8A CN117896003A (en) | 2024-03-05 | 2024-03-05 | Digital optical fiber repeater for GSM-R multi-carrier combined technology |
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| CN117896003A true CN117896003A (en) | 2024-04-16 |
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| CN202410245671.8A Pending CN117896003A (en) | 2024-03-05 | 2024-03-05 | Digital optical fiber repeater for GSM-R multi-carrier combined technology |
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