CN106454560A - Multi-business digital light distribution system and multi-business capacity scheduling method - Google Patents

Abstract

The invention discloses a multi-service digital optical distribution system, which includes a near-end unit and a far-end unit. In the near-end unit, the downlink signal entering the near-end unit is processed and sent from a data interface and passes through an Ethernet processing unit. Carry out baseband CPRI framing together, then become optical signal by digital optical module, become microwave signal and transmit to far-end machine through optical fiber or by microwave transceiver unit; In said far-end machine: from the optical signal of near-end machine After passing through the digital optical module in the remote machine, it becomes a digital signal, and after being deframed by CPRI, it becomes a baseband signal and an Ethernet signal. After the Ethernet signal passes through the Ethernet processing unit, it is transmitted to other data terminals through the data interface; The microwave signal from the near-end machine becomes an intermediate frequency signal after passing through the microwave antenna and the microwave transceiver unit in the far-end machine, and enters the digital signal processing unit to become a baseband signal after analog-to-digital conversion; the two baseband signals are processed in the digital signal processing In the unit, it becomes an intermediate frequency signal, and after passing through the frequency conversion unit, it becomes a radio frequency signal. After downlink amplification, it enters the multiplexer and then the antenna transmits the signal.

Description

A multi-service digital optical distribution system and multi-service capacity scheduling method

technical field

The invention relates to mobile communication and private network communication technology, more specifically, to a multi-service digital optical distribution system and a multi-service capacity scheduling method.

Background technique

The rapid development of mobile communication technology has driven the explosive growth of mobile Internet and broadband data services, which has brought great challenges to traditional network coverage and optimization. For example, if the existing single- or dual-band optical fiber repeater equipment is used, multiple devices have to be used in multi-band and multi-standard coverage cells, resulting in increased costs and increased installation complexity. If the coverage method of BBU (Baseband Unit, baseband unit) + RRU (Radio Remote Unit, remote unit) is adopted, since RRU (Radio Remote Unit, remote unit) can basically only support single frequency, it cannot satisfy multi-frequency , Multi-mode requirements, and because the signal source used in the coverage area may not be the same main equipment manufacturer, it will cause the BBU (Baseband Unit, baseband unit) to be unusable, which will affect the implementation of the overall coverage plan.

In addition, in recent years, all countries in the world have vigorously promoted the development of rail transit. High-speed rail, intercity, subway, etc. will become the primary choice for people to travel short and medium distances in the future. Due to the characteristics of rail transit, such as fast vehicle speed, large vehicle body shielding, and complex road conditions, the communication quality of passengers is greatly affected, which causes a lot of inconvenience to travel, business trips, etc. In view of the above-mentioned network complexity of rail transit, if the traditional BBU (Baseband Unit, baseband unit) + RRU (RadioRemote Unit, remote unit) coverage method is used, in order to achieve multi-service coverage, on the one hand, a large number of different types of RRUs are required (Radio Remote Unit, remote unit) construction not only takes up a lot of space and requires high investment, but also is very difficult to upgrade and maintain. On the other hand, it will bring disadvantages such as frequent cell switching and intensive station construction, which will lead to frequent call drops.

In order to solve the problems of multi-service coverage in the field of mobile communication and private network proposed above, a few powerful manufacturers in the world have carried out technical research, but the technical research of all manufacturers still stays in the single communication field:

For example, the invention patent "A Digital Capacity Centric Distributed Antenna System" with the announcement number WO2014026005A1 was applied by Axell Wireless in 2014 for a digital capacity centralized distributed antenna system in the field of mobile communications. Although it mentions only downlink FM RF signal, but its implementation is not further described. The technical solution of this invention patent is to use a three-layer network architecture including MTDI, MSDH, RRU, etc. to achieve multiple frequency band signal coverage. The disadvantages are as follows: 1. MTDI uses different types of equipment corresponding to different interfaces, such as RF MTDI, AUX MTDI, Digital MTDI, and different MTDIs are connected to MSDH for management, resulting in scattered MTDIs, inconvenient applications in product applications, and a large space occupation; 2. The entire coverage network adopts a three-layer architecture, and product applications are complex and occupy a large space , especially not suitable for high-power RRU coverage; 3. MTDI does not support wireless access signals, and the application environment is limited; 4. The transparent transmission data channel needs to be implemented by an independent GateWay, and product integration design has not been realized; 5. Does not support private network system with single downlink channel; 6. RRU supports up to 4 frequency bands. When implementing MIMO, two independent RRUs are required, which is not conducive to product application; 7. Does not support TDD signal coverage, and the application environment is limited.

The invention patent with the announcement number WO2013097199A1 "Clock Switching Method, Device and Indoor Distributed System with Repeater as Relay" is a digital indoor distributed system in the field of mobile communication filed by Comba in 2013. The technical solution of this invention patent also uses a three-layer network architecture including MAU, MEU, and MRU to achieve indoor signal coverage, but the patent mainly talks about how to synchronize the clocks between MAU, MEU, and MRU, and rarely involves how to use this. Three parts cover the interior. According to its instruction manual, from the perspective of indoor coverage, the disadvantages are as follows: 1. The entire coverage network adopts a three-layer structure, the product application is complex, and it takes up a lot of space, especially not suitable for high-power RRU coverage; 2. MAU does not support wireless Access signal, limited application environment 3. Does not support private network system; 4. Does not support TDD signal coverage, limited application environment.

Contents of the invention

In view of the shortcomings of the prior art, the purpose of the present invention is to provide a multi-service digital optical distribution system and a multi-service capacity scheduling method to provide effective signal coverage for existing complex mobile communication networks and private network communication networks.

In order to achieve the above object, the technical solution of the multi-service digital optical distribution system of the present invention is: 1. A multi-service digital optical distribution system, comprising a near-end unit and a far-end unit, in the near-end unit: After the downlink signal is processed, it performs baseband CPRI (Common Public Radio Interface, Common Public Radio Interface) framing together with the signal from the data interface and through the Ethernet processing unit, and then becomes an optical signal through a digital optical module through an optical fiber or through a microwave transceiver unit Become a microwave signal and transmit to the far-end machine; In the said far-end machine: the optical signal from the near-end machine becomes a digital signal after passing through the digital optical module in the far-end machine, and passes through CPRI (Common Public Radio Interface, general public After deframing, the Ethernet signal becomes the baseband signal and the Ethernet signal, and the Ethernet signal passes through the Ethernet processing unit, and then is transmitted to other data terminals through the data interface; the microwave signal from the near-end machine passes through the microwave in the far-end machine After the antenna and microwave transceiver unit, it becomes an intermediate frequency signal, and after entering the digital signal processing unit, it becomes a baseband signal after analog-to-digital conversion; any of the two baseband signals becomes an intermediate frequency signal in the digital signal processing unit, and after passing through the frequency conversion unit It becomes a radio frequency signal. After downlink amplification, it enters the multiplexer and then the antenna transmits the signal. After downlink amplification, the radio frequency signal is coupled with a part of the signal from the output end and enters the feedback signal conversion unit to become a feedback digital baseband signal. A spectrum display processing unit and a spectrum display interface.

As an improvement of the present invention, in the near-end machine: the downlink signal entering the near-end machine is a radio frequency signal coupled through a coupler, or a radio frequency signal received by the antenna of the near-end machine, or a base station through a base station protocol interface The baseband signal or the combination of the aforementioned signals directly transmitted to the digital signal processing unit of the near-end machine, the radio frequency signal coupled from the base station enters the frequency conversion unit of the near-end machine, and the radio frequency signal received by the antenna of the near-end machine enters the transceiver unit , and are processed into intermediate frequency signals in the frequency conversion unit and the transceiver unit respectively, and the intermediate frequency signals enter the digital signal processing unit after passing through the interface board, and the digital signal processing unit converts the incoming intermediate frequency signals into baseband signals after analog-to-digital conversion; the near-end The transceiver unit of the machine includes a duplexer, an uplink and downlink amplification part, and a frequency conversion part. The couplers 1 to N of the near-end machine can be couplers of different coupling levels, and the base station protocol interfaces 1 to N correspond to different types of base stations. The near-end antennas 1 to N are selected according to the needs of actual working scenarios, and the duplexers, uplink and downlink amplification and frequency conversion units in the transceiver units 11 to 1N and N1 to NN of the near-end devices are determined according to the system operating frequency.

As an improvement of the present invention, in the near-end machine: the baseband signal directly transmitted to the digital signal processing unit of the near-end machine through the base station protocol interface or the baseband signal obtained after processing the radio frequency signal coupled through the base station Or the baseband signal obtained after processing the radio frequency signal received by the antenna of the near-end machine or the baseband signal of three combinations passes through the spectrum display processing unit, and then performs FFT (FastFourier Transformation, Fast Fourier Transformation) after data buffering to a certain number of digital signals Transformation, the time-domain signal is changed into a frequency-domain signal, and then becomes a spectrum signal after being smoothed by windowing. The spectrum signal passes through the spectrum display interface, and the spectrum of the required frequency band is displayed on a display terminal made of a monitor or software.

As an improvement of the present invention, in the remote unit: part of the baseband signal obtained by processing the optical signal of the near-end unit enters the remote unit at the same level for processing, while the other part passes through The optical fiber cascade processing unit of the remote machine is sent to the next remote machine to realize cascading between the remote machines.

As an improvement of the present invention, in the remote machine, the microwave transceiver unit includes a duplexer, uplink and downlink amplification and frequency conversion parts.

As an improvement of the present invention, in the remote machine: the baseband signal passes through the spectrum display processing unit, and after the data is buffered to a certain number of digital signals, FFT (Fast Fourier Transformation, Fast Fourier) transformation is performed, and the time The domain signal becomes a frequency domain signal, and becomes a spectrum signal after being smoothed by windowing. The spectrum signal passes through the spectrum display interface, and the spectrum of the required frequency band is displayed on a display terminal made of a monitor or software.

As an improvement of the present invention, in the remote machine: according to the size of the radio frequency signal bandwidth, one or more radio frequency signals passing through the frequency conversion unit are combined to reduce the number of radio frequency signal channels entering the next stage to carry more frequency bands.

As an improvement of the present invention, in the remote machine: according to whether it has MIMO (Multiple-inputMultiple-output) channel characteristics, the amplified radio frequency signals are respectively sent to the first multiplexer After being filtered by the multiplexer, the intermodulation signal and other interference signals are filtered out, and then transmitted by the antenna or leaky cable to achieve the purpose of signal coverage.

As an improvement of the present invention, a first power supply unit and a second power supply unit are respectively provided in the near-end machine and the remote machine, and the first power supply unit and the second power supply unit are interconnected through the interface board. When working, the two power supply units equally distribute the system power, and when any one is damaged, it will switch to a single power supply unit for power supply.

As an improvement of the present invention, in the remote machine: the feedback digital baseband signal passes through the spectrum display processing unit, after the data is cached to a certain number of digital signals, FFT (Fast Fourier Transformation, Fast Fourier) transformation is performed, and the The time-domain signal becomes a frequency-domain signal, which becomes a spectrum signal after being smoothed by windowing. The spectrum signal passes through the spectrum display interface, and the spectrum of the required frequency band is displayed on the display terminal made of a monitor or software.

The technical scheme of the multi-service capacity scheduling method of the present invention is: a multi-service capacity scheduling method, which includes the following steps: (1) according to the number of operators in each frequency band and the bandwidth of the frequency bands they occupy respectively, set the upper and lower levels of each frequency band (2) setting system uplink service judgment threshold; (3) detecting all uplink channel powers of each frequency band of all MRRU (Multi-band RadioRemote Unit, multi-band remote unit); (4 ) to determine whether the current power value is greater than the uplink service judgment threshold, if yes, then go to step (5), otherwise, the corresponding uplink channel and downlink channel gain of the corresponding frequency band of the corresponding MRRU (Multi-bandRadio Remote Unit, multi-band remote unit) The value is set to 0; (5) the corresponding uplink channel and downlink channel gain value of the corresponding frequency band of the corresponding MRRU (Multi-band Radio Remote Unit, multi-band remote unit) is set to 1; (6) all MRRU (Multi-band Radio Remote Unit, multi-band remote unit) corresponding uplink channels of corresponding frequency bands are summed and sent to D-OMU (Digital Optical Master Unit, digital optical near-end unit).

Compared with the prior art, the beneficial effects of the present invention are as follows: 1. A two-layer network architecture is adopted to realize multi-band signal coverage, with fewer equipment types and more convenient application; 2. One device of the near-end unit (OMU) is compatible with the RF interface of the base station, Digital interface, and wireless interface, with extended optical port, used to extend and receive long-distance base station data; 3. Introduce gigabit network (WLAN) data transparent transmission function; 4. Digital intermediate frequency (DSPU: Digital Signal Processing Unit) The unit is separated from the frequency conversion (T/R) unit, supports hot plugging, and can realize free combination of any frequency band and any standard according to needs; 5. The remote unit (ORU) can support up to 8 frequency bands, and supports RF combined output and Each frequency band is output separately, which can meet the MIMO needs of the current LTE system; 6. The near-end power supply is powered by dual power supplies, which can support redundant switching functions, so that when one of the power supplies is abnormal, the system power supply can continue to work normally, improving reliability 7. Support private network communication signals; 8. Support combined output of TDD signal and FDD signal; 9. Support microwave transmission; 10. Have spectrum display function; 11. Have capacity scheduling function.

Description of drawings

The structure and beneficial technical effects of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a block diagram of near-end units of the multi-service digital optical distribution system of the present invention;

Fig. 2 is a block diagram of the remote unit composition of the multi-service digital optical distribution system of the present invention;

Fig. 3 is the schematic diagram of the transceiver unit circuit of the near-end machine;

Fig. 4 is the schematic diagram of the frequency conversion unit circuit of the near-end machine (TDD system);

Fig. 5 is the schematic diagram of the microwave transceiver unit circuit of the near-end machine;

Fig. 6 is the schematic diagram of the frequency conversion unit circuit of the remote machine (private network, single downlink);

Fig. 7 is the schematic diagram of the frequency conversion unit circuit (TDD&FDD) of the remote machine;

Fig. 8 is the schematic diagram (TDD) of the uplink and downlink amplifying unit circuits of the remote machine;

Fig. 9 is a circuit schematic diagram of a feedback signal conversion unit;

Fig. 10 is a circuit schematic diagram of the spectrum display processing unit;

Figure 11 is an example diagram of frequency spectrum display;

Fig. 12 is a flow chart of the multi-service capacity scheduling method of the present invention;

FIG. 13 is a schematic diagram of 700MHz LTE frequency band capacity scheduling.

detailed description

In order to make the purpose of the invention, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.

Referring to Figures 1 to 11, the near-end unit of the multi-service digital optical distribution system of the present invention includes: near-end unit antenna 1...N, near-end unit microwave antenna, transceiver unit 11...1N, transceiver unit N1...NN, coupler 1 ...N, frequency conversion unit 1...N, interface board, power supply unit 1, power supply unit 2, monitoring unit, digital signal processing unit, Ethernet processing unit, data interface 1, data interface 2, microwave transceiver unit, near-end machine fiber level Link processing unit, spectrum display processing unit, spectrum display interface and other parts; remote machine includes: remote machine microwave antenna, microwave transceiver unit, Ethernet processing unit, digital signal processing unit, remote machine fiber cascade processing unit, interface Board, power supply unit 1, power supply unit 2, monitoring unit, frequency conversion unit 1...N, data interface 1, data interface 2, uplink and downlink amplification 1...N, multiplexer 1, multiplexer 2, antenna, MIMO antenna , spectrum display processing unit, spectrum display interface, feedback signal conversion unit 1...N and other parts.

The downlink radio frequency signal received from the base station coupling or near-end machine antenna enters the frequency conversion unit and the transceiver unit respectively, becomes an intermediate frequency signal, and enters the digital signal processing unit after passing through the interface board. The digital signal processing unit processes the incoming intermediate frequency signal through the modulus After conversion, it becomes a baseband signal, and the baseband signal and the signal from data interface 1 and data interface 2, and the signal after passing through the Ethernet processing unit perform baseband CPRI framing together, and become an optical signal through a digital optical module and send and receive through optical fiber or microwave The unit becomes a microwave signal for transmission. The second way is that the base station directly transmits the baseband signal of the base station to the digital signal processing unit through the base station protocol interface between the base station and the digital signal processing unit. Together with the data interface 2 and the signal after the Ethernet processing unit, baseband CPRI framing is performed, and the digital optical module is converted into an optical signal and transmitted through an optical fiber or a microwave transceiver unit into a microwave signal. Or the third way is that a part of the baseband signal analyzed by the base station protocol interface and a part of the baseband signal converted from the radio frequency signal received by the base station or the antenna of the near-end machine are combined together with the signal from data interface 1 and data interface 2, The signals after passing through the Ethernet processing unit are combined with baseband CPRI framing, and are converted into optical signals through digital optical modules and transmitted through optical fibers or through microwave transceiver units into microwave signals. The optical signal received by the remote machine from the optical fiber of the near-end machine becomes a digital signal after passing through a digital optical module, and becomes a baseband signal and an Ethernet signal after being deframed by CPRI. to data port 1 and data port 2. Or it becomes an intermediate frequency signal after passing through the microwave antenna and microwave transceiver unit of the remote machine, and becomes a baseband signal after entering the digital signal processing unit and undergoing analog-to-digital conversion. The baseband signal becomes an intermediate frequency signal in the digital signal processing unit, and becomes a radio frequency signal after passing through the frequency conversion unit. After downlink amplification, it enters the multiplexer and transmits the signal from the antenna or MIMO antenna.

For the uplink signal received from the antenna or leaky cable, through a process almost similar to that of the downlink signal, the uplink radio frequency signal is converted into an optical signal or a microwave signal in the far-end machine, and the optical signal or microwave signal is converted into a microwave signal in the near-end machine. It is a radio frequency signal, so as to realize the receiving and processing process of the uplink signal.

Below is the signal transmission process of the system of the present invention:

step 1:

The downlink signal entering the near-end unit may come from the following three aspects:

(1) Directly couple the radio frequency signal of the base station through the coupler, and after passing through the frequency conversion unit, it becomes an intermediate frequency signal;

(2) After receiving the radio frequency signal through the antenna of the near-end machine, a relatively clean intermediate frequency signal is obtained through processing by the transceiver unit, which includes a duplexer, an uplink and downlink amplification part, and a frequency conversion part.

(3) The base station communicates with the base station protocol interface in the digital signal processing unit of the near-end computer through the base station interface, and obtains the downlink baseband signal after analysis.

In specific implementation, the couplers 1...N can use 30dB/40dB/50dB or other couplers with different coupling levels. The base station interface 1...N is related to the type of the base station. Different types of base stations have different base station interfaces. The corresponding base station Protocol interfaces 1...N are also changed accordingly, where the transmission medium can be optical fiber or network cable, etc. The near-end antennas 1...N can be selected according to actual working scenarios. The duplexers, uplink and downlink amplification and frequency conversion units in the transceiver units 11...1N, N1...NN are determined according to the operating frequency of the system.

Step 2:

The intermediate frequency signal in step 1 is filtered by the frequency conversion unit of the near-end machine or the internal filter of the transceiver unit to filter out its image interference, so as to output a relatively pure intermediate frequency signal. During specific implementation, the filter can be designed with L, C discrete devices or special integrated devices, and the intermediate frequency can be adjusted according to the actual needs of the system. The intermediate frequency of the present invention is selected as 184.32MHz, but it is not limited to this frequency.

Step 3:

For the relatively pure intermediate frequency signal in step 2, it enters the digital signal processing unit after being transferred by the interface board. Based on the theory of software radio, the main digital signal processing unit passes the signal to the intermediate frequency signal through the A/D device according to a certain sampling rate. into a digital signal. During concrete realization, A/D device can select dual-channel A/D device or single-channel A/D device, and sampling rate can be adjusted according to intermediate frequency frequency and bandwidth relationship, and sampling rate is selected as 491.52MSPS among the present invention, but is not limited to the sampling rate.

Step 4:

The digital signal of the digital signal processing unit in the step 3 or the baseband signal of the (3) aspect in the step 1 pass through the spectrum display processing unit, after data buffering to a certain number of digital signals, and then through the FFT transform, the time domain The signal becomes a frequency domain signal, and after being smoothed by windowing, it becomes a spectrum signal. During specific implementation, the number of digital signals with a certain number of points can be freely selected according to the system, and the number of digital signals determined in the present invention is 16384, but it is not limited to this number of points. Windowing can add rectangular window, Hanning window, etc., but is not limited to this type of window function.

Step 5:

The spectrum signal in step 4 passes through the spectrum display interface, and the spectrum of the required frequency band is displayed on the terminal. During specific implementation, the spectrum display interface can be a display or a software GUI display, and at the same time, it is necessary to add functions for adjusting spectrum display based on the spectrum display or software GUI, such as adjusting spectrum resolution, adjusting spectrum bandwidth, and adjusting spectrum amplitude and other functions.

Step 6:

The digital signal of the digital signal processing unit in step 3 or the baseband signal of aspect (3) in step 1 and the digital signal recovered from the signals from data interface 1 and data interface 2 after passing through the Ethernet processing unit are carried out together for CPRI framing , the baseband signal converted into a serial high data rate is converted into an optical signal by the digital optical module and sent out through the main optical fiber or sent out by the microwave antenna after passing through the microwave transceiver unit. In specific implementation, the signal rate from data interface 1 and data interface 2 can be 10M, 100M or 1000M, and the signal can be communication signal such as WIFI; data stream signal such as image, video and so on. The number of data interfaces in the present invention is 2, but not limited to this number. The CPRI framing data rate can be adjusted according to the actual needs of the system, and is selected as 10Gbps in the present invention, but is not limited to this rate; special-purpose chips or field programmable logic devices (FPGA) or DSP can be used to realize concrete framing. In addition, the digital signal in the digital signal processing unit may be any one of the three aspects in step 1 or any combination thereof.

Step 7:

The optical fiber signal or microwave signal obtained from step 6, after long-distance optical fiber transmission or microwave transmission, is sent to the optical fiber port of the remote machine or the microwave receiving antenna; the distance can be 1km, 5km, 10km, 20km, 40km or 80km, etc. . The present invention adopts 20km, but is not limited to the number of kilometers. The microwave frequency band can be any frequency band above 3GHz, and the present invention adopts 60GHz.

Step 8:

The optical signal in step 7 enters the digital signal processing unit of the far-end machine through the near- and far-end optical fiber protocol interface. After CPRI deframing, the digital signal processing unit obtains the baseband digital signal and the Ethernet data transparent transmission signal. After the Ethernet data transparent transmission signal passes through the Ethernet processing unit, it is transmitted to other data terminals through data interface 1 and data interface 2. Part of the baseband digital signal enters the remote machine at the same level for processing, and part of it is sent to the remote machine at the next level through the optical fiber cascade processing unit of the remote machine to realize the cascading between the remote machines. During specific implementation, the signal rate transmitted to data interface 1 and data interface 2 can be 10M, 100M or 1000M, and the signal can be a communication signal such as WIFI, a data stream signal such as image, video, etc., and the number of data interfaces in the present invention is 2 but not limited to this number. The number of optical fiber protocol interfaces 1...N of the near-end machine and R21...R2N of the optical fiber cascading unit of the remote machine depends on the specific application scenario. In the present invention, there are two, but not limited to this number.

Step 9:

In addition to the signal transmitted from the optical fiber of the near-end computer in step 8, the way for the remote computer to obtain the baseband digital signal can also be obtained from the microwave antenna of the remote computer. The specific process is that after receiving the space signal by the microwave antenna of the remote machine, a relatively clean radio frequency signal is obtained through the microwave transceiver unit. The microwave transceiver unit includes a duplexer, uplink and downlink amplification and frequency conversion parts. During specific implementation, the microwave antenna of the remote machine can be selected according to the needs of actual working scenarios. The duplexer, uplink and downlink amplification and frequency conversion parts are determined according to the system operating frequency. The frequency conversion part mainly realizes that the radio frequency signal is converted into an intermediate frequency signal. The present invention uses 184.32 MHz, but is not limited to this frequency.

Step 10:

The intermediate frequency signal in step 9 enters the digital signal processing unit. Based on the theory of software radio, the digital signal processing unit converts the intermediate frequency signal into a digital signal through the A/D device according to a certain sampling rate. During concrete realization, A/D device can select dual-channel A/D device or single-channel A/D device, and sampling rate can be adjusted according to intermediate frequency frequency and bandwidth relationship, and sampling rate is selected as 491.52MSPS among the present invention, but is not limited to the sampling rate.

Step 11:

The digital signal in step 8 or step 10 passes through the spectrum display processing unit, first passes through the data cache to a certain number of digital signals, and then undergoes FFT transformation to change the time domain signal into a frequency domain signal, and after windowing and smoothing, it becomes spectrum signal. During specific implementation, the number of digital signals with a certain number of points can be freely selected according to the system, and the number of digital signals determined in the present invention is 16384, but it is not limited to this number of points. Windowing can add rectangular window, Hanning window, etc., but is not limited to this type of window function.

Step 12:

The spectrum signal in step 11 passes through the spectrum display interface, and the spectrum of the required frequency band is displayed on the terminal. During specific implementation, the spectrum display interface can be a display or a software GUI display, and at the same time, it is necessary to add functions for adjusting spectrum display based on the spectrum display or software GUI, such as adjusting spectrum resolution, adjusting spectrum bandwidth, and adjusting spectrum amplitude and other functions.

Step 13:

The digital signal in step 8 or step 10 passes through the digital signal processing unit, undergoes digital-to-analog conversion, becomes an intermediate frequency signal, enters the frequency conversion unit, and recovers as a radio frequency signal. During specific implementation, the intermediate frequency is set according to the actual needs of the system. The present invention is set to 138.24MHz, but is not limited to this frequency. In addition, in practical applications, one or more channels can be passed through according to the bandwidth of the radio frequency signal. The RF signal of the frequency conversion unit is combined to reduce the number of RF signal channels entering the next stage to carry more frequency bands.

Step 14:

The radio frequency signal in step 13 becomes a power amplified radio frequency signal after passing through the uplink and downlink amplification parts. In actual implementation, the downlink amplifier mainly plays the role of power linear amplification, and can adopt A/AB class power amplifier, or Doherty power amplifier, or DPD MCPA/APD MCPA/FF MCPA, etc., but not limited to power amplifiers of these technologies. At the same time, one or more input radio frequency signals can be linearly amplified by an uplink and downlink amplifying part according to the distance between the radio frequency signals after the frequency conversion unit.

Step 15:

In step 14, a part of the radio frequency signal after power linear amplification is coupled from the output terminal into the feedback signal conversion unit, and the radio frequency signal is converted into a digital signal through a process similar to step 1 and step 3. In the specific implementation process, the size of the coupler, the frequency selection of the intermediate frequency, and the size of the sampling rate are the same as or different from the values in step 1 and step 3.

Step 16:

The digital signal in step 15 goes through the same process as step 11 and step 12 to realize the signal spectrum display after linear amplification. In this way, the spectrum display of the downlink signal at the output end of the remote machine is realized.

Step 17:

The radio frequency signal after power linear amplification in step 14 is sent to multiplexer 1 and multiplexer 2 respectively according to whether it has MIMO channel characteristics, and intermodulation is filtered out after being filtered by the multiplexer Signals and other interference signals are emitted by antennas or leaky cables to achieve the purpose of signal coverage. In specific implementation, the multiplexing combiner is realized by cavity filtering, but it is not limited to adopting this technology. In addition, in order to combine TDD signals, there may be one or more single-channel filters.

Step 18:

The above steps 1-17 complete the entire process of the downlink radio frequency signal being connected from the near-end unit to the output of the remote unit. For the uplink signal, after receiving the uplink radio frequency signal from the antenna or leaky cable of the far-end unit, the process is similar to step 1. The process of -17 completes the entire process of the uplink signal from the far-end machine to the near-end machine, which will not be repeated here, but the protection of the technical principle is also effective.

In addition, the three aspects of the signal in step 1 can be determined according to the application scenario. It can be a signal of one aspect or any combination of signals; for the digital signal of the remote machine in steps 8 and 10, the system will Select the signal transmitted by the optical fiber of the near-end machine or the signal received by the microwave antenna of the far-end machine; the power supply unit 1 and power supply unit 2 of the near-end machine and the remote machine are interconnected through the interface board, and current sharing technology is used between them. Two power supply units evenly distribute system power, and when any one is damaged, it will automatically switch to a single power supply unit for power supply; BS_1N, BS_2N, transceiver unit 1N, transceiver unit NN, frequency conversion unit N, base station protocol interface N, near-far The optical fiber interface protocol N of the end machine, and the MN in the optical fiber cascading unit of the near end machine. Near and far-end optical fiber protocol interfaces 1...N in the remote machine, optical fiber cascading units R21...R2N in the remote machine, frequency conversion units 1...N, and uplink and downlink amplifiers 1...N. Feedback signal conversion unit 1...N, where N represents from 1, 2, 3...N, the specific value of N is determined by the specific system design; the power supply unit and monitoring unit of the near-end machine and the remote machine can be adjusted according to the actual situation. System design, free choice of quantity combination. For example, only one power supply unit or no monitoring unit is selected; when the near-end machine and the remote machine use microwave antennas for transmission, it must be ensured that the near-end machine inserts a synchronization signal when CPRI Frame time, the synchronous signal is restored to ensure the synchronization between the near and remote machines; the spectrum display in step 4/step 5, step 11/step 12, step 15/step 16 can display both the uplink spectrum and the downlink spectrum, It may also include both uplink and downlink spectrum.

Please refer to Fig. 12, the multi-service capacity scheduling method of the present invention includes the following steps: (1) according to the number of operators in each frequency band and the frequency band bandwidth respectively occupied, the number of uplink and downlink channels and the channel bandwidth of each frequency band are set; (2) ) setting the system uplink service judgment threshold; (3) detecting all uplink channel powers of each frequency band of all MRRUs; (4) judging whether the current power value is greater than the uplink service judgment threshold, if yes, then turning to step (5) , otherwise, the corresponding uplink channel and downlink channel gain value of the corresponding frequency band of the corresponding MRRU is set to 0; (5) the corresponding uplink channel and downlink channel gain value of the corresponding frequency band of the corresponding MRRU is set to 1; (6) the corresponding uplink channel gain value of the corresponding frequency band of all MRRU The channels are summed and sent to the D-OMU.

Please refer to Fig. 13, which is to use the multi-service capacity scheduling method to schedule the capacity of the 700MHz LTE frequency band, wherein, FIFO: (First in First output); DDC (Digital Down Convert); FIR (Finite Impulse Response).

According to the disclosure and teaching of the above specification, those skilled in the art to which the present invention pertains can also make appropriate changes and modifications to the above embodiment. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims (11)

1. a multi-service digital light compartment system, including near-end machine and remote termination, it is characterised in that

In described near-end machine:Enter near-end machine downstream signal after treatment with from data-interface and through Ethernet process The signal of unit carries out base band CPRI framing together, then becomes optical signal by digital light module and through optical fiber or passes through microwave Transmit-Receive Unit becomes microwave signal transmission to remote termination；

In described remote termination:Optical signal from near-end machine becomes data signal after the digital light module in remote termination, Solve after frame through CPRI and become baseband signal and ethernet signal, ethernet signal therein after Ethernet processing unit, Transmit to other data terminals through data-interface；From the microwave signal of near-end machine through the microwave antenna in remote termination, microwave Become intermediate-freuqncy signal after Transmit-Receive Unit, enter digital signal processing unit after analog to digital conversion, become baseband signal；Described two Any one becomes intermediate-freuqncy signal in digital signal processing unit to plant baseband signal, becomes radio frequency letter after converter unit Number, after descending amplification, after entering multiplexing's combiner, antenna is launched signal and go out, the radiofrequency signal after descending amplification Also enter feedback signal converting unit from a part of signal of output coupling, become feedback digital baseband signal, enter frequency spectrum and show Show processing unit and frequency spectrum display interface.

2. multi-service digital light compartment system according to claim 1, it is characterised in that in described near-end machine:Described Enter radiofrequency signal that the downstream signal of near-end machine received for the radiofrequency signal that coupled by coupler or near-end machine antenna, Or base station is transmitted directly to the baseband signal of the digital signal processing unit of near-end machine or aforementioned by base station protocol interface The combination of signal, the described converter unit entering near-end machine from the radiofrequency signal of base stations couple, described near-end machine antenna receives Radiofrequency signal enter Transmit-Receive Unit, and in converter unit and Transmit-Receive Unit, be processed as intermediate-freuqncy signal, intermediate-freuqncy signal warp respectively Cross and enter digital signal processing unit after interface board, digital signal processing unit to the intermediate-freuqncy signal entering after analog-to-digital conversion Become baseband signal；The Transmit-Receive Unit of described near-end machine includes duplexer, up-downgoing amplifier section and frequency conversion part, described closely The coupler 1 of terminal can be the coupler of difference coupling grade, the corresponding different types of base of base station protocol interface 1 to N to N Standing, described near-end machine antenna 1 to N needs according to real work scene and selects, and the Transmit-Receive Unit 11 of described near-end machine arrives 1N, N1 Depending on duplexer in NN, up-downgoing amplification and converter unit are according to system operating frequency.

3. multi-service digital light compartment system according to claim 2, it is characterised in that in described near-end machine：Described It is transmitted directly to the baseband signal of the digital signal processing unit of near-end machine by base station protocol interface or pass through base stations couple The baseband signal that obtains after treatment of radiofrequency signal or the radiofrequency signal that received by near-end machine antenna after treatment The baseband signal of the baseband signal obtaining or three kinds of combinations is through frequency spectrum display processing unit, by data buffer storage to necessarily Carry out FFT after the data signal counted, time-domain signal become frequency-region signal, after smoothing through windowing, become spectrum signal, Spectrum signal, through frequency spectrum display interface, is shown to the frequency spectrum needing frequency range the display terminal made by display or software On.

4. multi-service digital light compartment system according to claim 1, it is characterised in that in described remote termination：Described By baseband signal obtained from processing the optical signal of near-end machine, one part enters at this grade of remote termination Reason, and another part delivers to next stage remote termination by remote termination optical fiber cascade processing unit, it is achieved cascade between remote termination.

5. multi-service digital light compartment system according to claim 1, it is characterised in that in described remote termination, described Microwave transceiver unit includes duplexer, up-downgoing amplification and frequency conversion part.

6. multi-service digital light compartment system according to claim 1, it is characterised in that in described remote termination：Described Baseband signal is through frequency spectrum display processing unit, by carrying out FFT after the data signal of data buffer storage to certain point number, and will Time-domain signal becomes frequency-region signal, becomes spectrum signal after smoothing through windowing, and spectrum signal is through frequency spectrum display interface, needs The frequency spectrum of frequency range is shown on the display terminal made by display or software.

7. multi-service digital light compartment system according to claim 1, it is characterised in that in described remote termination：According to The size of radiofrequency signal bandwidth, wherein a certain road or multichannel through the radiofrequency signal of converter unit through closing road, reduce into Enter the radio frequency signal channels number of next stage to carry more multiband.

8. multi-service digital light compartment system according to claim 1, it is characterised in that in described remote termination：According to Whether having MIMO channel characteristics, the radiofrequency signal after amplifying is respectively fed to first multiplexing's combiner and the second multiplexing Combiner, filters inter-modulated signal after the filtering of multiplexing's combiner and other disturb signal, is launched by antenna or leakage cable and reaches The purpose covering to signal.

9. multi-service digital light compartment system according to claim 1, it is characterised in that at described near-end machine and remote termination In be provided with the first power subsystem and second source unit respectively, the first power subsystem and second source unit are equal by interface board Stream interconnection, when normally working, two power subsystem mean allocation system powers, when any one damages, switch to single electricity Source unit is powered.

10. multi-service digital light compartment system according to claim 1, it is characterised in that in described remote termination：Described Feedback digital baseband signal, through frequency spectrum display processing unit, is carried out by after the data signal of data buffer storage to certain point number Time-domain signal is become frequency-region signal by FFT, becomes spectrum signal after smoothing through windowing.Spectrum signal shows through frequency spectrum Interface, is shown to the frequency spectrum needing frequency range on the display terminal made by display or software.

11. 1 kinds of multi-service capacity scheduling methods, utilize the multi-service digital light compartment system of claim 1 to 10 to carry out signal Cover, it is characterised in that it comprises the steps：

(1) the operator's number according to each frequency range and the band bandwidth occupying respectively, sets the up-downgoing letter of each frequency range Number of channels and channel width；

(2) initialization system uplink service judges thresholding；

(3) all up channel power of all each frequency ranges of MRRU are detected；

(4) judge whether current power value judges thresholding, if it is, forward step (5) to, otherwise, accordingly more than uplink service The corresponding up channel of MRRU corresponding band and down channel yield value are set to 0；

(5) corresponding up channel and the down channel yield value of corresponding MRRU corresponding band is set to 1；

(6) the corresponding up channel of all MRRU corresponding band is sent to D-OMU after being added.