PDT radio remote device

Abstract

The utility model relates to the technical field of digital trunking communication, in particular to PDT radio frequency remote equipment, which comprises an optical fiber remote end device and an optical fiber remote end device, and the optical fiber remote end device comprises a first duplexer, a first low-noise amplifier, a second low-noise amplifier and a first digital optical module. The optical fiber pull-out end device comprises a second digital optical module, a low-noise amplifier module, a power amplifier module and a second duplexer, and the first duplexer is electrically connected with the first low-noise amplifier and the second low-noise amplifier; the first digital optical module is electrically connected with the first low-noise amplifier, the second low-noise amplifier and the second digital optical module, the second digital optical module is electrically connected with the low-noise amplifier module and the power amplifier module, and the second duplexer is electrically connected with the low-noise amplifier module and the power amplifier module. Therefore, the signal coverage condition in remote areas and large and ultra-large buildings can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of digital cluster communication, in particular to a PDT radio frequency remote device. Background Art

[0002] PDT (Professional Digital Trunking) is a digital trunking communication technology designed specifically for professional wireless communication systems. Compared to traditional analog trunking communication technology, PDT systems offer higher communication capacity, lower interference, and more stable signal transmission. This means that in emergency situations, rescue teams can communicate with the command center and other rescue teams more quickly and securely.

[0003] As PDT system networks gain widespread use, requirements for network coverage and quality become increasingly stringent. Due to environmental factors, weak signal areas and blind spots can occur in wireless communication coverage areas, such as in remote areas, large buildings, canyons, subways, tunnels, factories, and mines. The cost of setting up new base stations is too high, and the infrastructure is complex. Therefore, in order to facilitate the promotion and application of PDT systems, cheaper and more reliable equipment is needed to address signal coverage issues. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a PDT radio frequency remote device, which can solve the signal coverage problems in remote areas and large and super-large buildings.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A PDT radio frequency remote device includes a fiber remote proximal device and a fiber remote distal device, wherein the fiber remote proximal device includes a first duplexer, a first low-noise amplifier, a second low-noise amplifier, and a first digital optical module, and the fiber remote distal device includes a second digital optical module, a low-noise amplifier module, a power amplifier module, and a second duplexer;

[0007] The first duplexer is electrically connected to the output end of the first low-noise amplifier and the input end of the second low-noise amplifier, respectively; the first digital optical module is electrically connected to the input end of the first low-noise amplifier, the output end of the second low-noise amplifier, and the second digital optical module, respectively; the second digital optical module is electrically connected to the output end of the low-noise amplifier module and the input end of the power amplifier module, respectively; and the second duplexer is electrically connected to the input end of the low-noise amplifier module and the output end of the power amplifier module, respectively.

[0008] The beneficial effects of the present invention are:

[0009] This solution is provided with an optical fiber pulling near-end device and an optical fiber pulling far-end device. The optical fiber pulling near-end device includes a first duplexer, a first low-noise amplifier, a second low-noise amplifier and a first digital optical module. The optical fiber pulling far-end device includes a second digital optical module, a low-noise amplifier module, a power amplifier module and a second duplexer. The base station downlink signal is coupled with part of the downlink signal through the coupler in the first duplexer, and the required 360MHz signal is input into the system. The radio frequency signal is amplified by the second low-noise amplifier, and then digitized and converted into an electrical / optical signal by the first digital optical module. The optical signal is then transmitted to the optical fiber pulling far-end device via the optical fiber. The optical fiber pulling far-end device transmits the uplink optical signal back through the optical fiber. After the uplink optical signal is digitized and converted into an optical / electrical signal by the first digital optical module, the radio frequency signal is amplified by the second low-noise amplifier, and the output signal is then transmitted to the second digital optical module. A duplexer filters and outputs the required 350MHz signal, which is transmitted to the base station through a feeder and a coupler. The fiber optic remote near-end device transmits the digitally processed downlink optical signal back through the optical fiber. After optical / electrical conversion by the second digital optical module, the output signal is amplified and output by the power amplifier module to amplify the required 360MHz signal. Finally, it is filtered and output to the retransmission antenna through the second duplexer to provide signal coverage for the blind area. The MS port of the fiber optic remote device is connected to the retransmission antenna to receive the uplink signal sent by the terminal. The received signal is filtered and output by the second duplexer, and the required 350M signal is input into the system. The signal is amplified by the low-noise amplifier module, input into the second digital optical module for electrical / optical signal conversion, and finally transmitted to the fiber optic remote near-end device through optical fiber, thereby solving the signal coverage problem in remote areas and large and extra-large buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a connection diagram of the PDT radio frequency remote device of the present utility model;

[0011] Figure 2 This is a block diagram showing the connection between the first digital optical module and the second digital optical module of the PDT radio remote device of the present invention;

[0012] Description of labels:

[0013] 1. Fiber pulling and near-end device; 101. Base station antenna; 102. First duplexer; 103. First low-noise amplifier; 104. Second low-noise amplifier; 105. First digital optical module; 1051. First A / D converter; 1052. First D / A converter; 1053. First FPGA chip; 1054. First MCU chip; 1055. First SFP laser assembly; 106. First electronic attenuator; 107. Second electronic attenuator; 108. Modem; 109. Modem antenna;

[0014] 2. Fiber optic extension remote device; 201. Second digital optical module; 2011. Second A / D converter; 2012. Second D / A converter; 2013. Second FPGA chip; 2014. Second MCU chip; 2015. Second SFP laser assembly; 202. Low-noise amplifier module; 203. Power amplifier module; 204. Second duplexer; 205. Retransmission antenna; 206. First filter; 207. Second filter. DETAILED DESCRIPTION

[0015] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

[0016] Please refer to Figure 1 , the technical solution adopted by this utility model is:

[0017] A PDT radio frequency remote device includes a fiber remote proximal device and a fiber remote distal device, wherein the fiber remote proximal device includes a first duplexer, a first low-noise amplifier, a second low-noise amplifier, and a first digital optical module, and the fiber remote distal device includes a second digital optical module, a low-noise amplifier module, a power amplifier module, and a second duplexer;

[0018] The first duplexer is electrically connected to the output end of the first low-noise amplifier and the input end of the second low-noise amplifier, respectively; the first digital optical module is electrically connected to the input end of the first low-noise amplifier, the output end of the second low-noise amplifier, and the second digital optical module, respectively; the second digital optical module is electrically connected to the output end of the low-noise amplifier module and the input end of the power amplifier module, respectively; and the second duplexer is electrically connected to the input end of the low-noise amplifier module and the output end of the power amplifier module, respectively.

[0019] From the above description, it can be seen that the beneficial effects of the present invention are:

[0020] This solution is provided with an optical fiber pulling near-end device and an optical fiber pulling far-end device. The optical fiber pulling near-end device includes a first duplexer, a first low-noise amplifier, a second low-noise amplifier and a first digital optical module. The optical fiber pulling far-end device includes a second digital optical module, a low-noise amplifier module, a power amplifier module and a second duplexer. The base station downlink signal is coupled with part of the downlink signal through the coupler in the first duplexer, and the required 360MHz signal is input into the system. The radio frequency signal is amplified by the second low-noise amplifier, and then digitized and converted into an electrical / optical signal by the first digital optical module. The optical signal is then transmitted to the optical fiber pulling far-end device via the optical fiber. The optical fiber pulling far-end device transmits the uplink optical signal back through the optical fiber. After the uplink optical signal is digitized and converted into an optical / electrical signal by the first digital optical module, the radio frequency signal is amplified by the second low-noise amplifier, and the output signal is then transmitted to the second digital optical module. A duplexer filters and outputs the required 350MHz signal, which is transmitted to the base station through a feeder and a coupler. The fiber optic remote near-end device transmits the digitally processed downlink optical signal back through the optical fiber. After optical / electrical conversion by the second digital optical module, the output signal is amplified and output by the power amplifier module to amplify the required 360MHz signal. Finally, it is filtered and output to the retransmission antenna through the second duplexer to provide signal coverage for the blind area. The MS port of the fiber optic remote device is connected to the retransmission antenna to receive the uplink signal sent by the terminal. The received signal is filtered and output by the second duplexer, and the required 350M signal is input into the system. The signal is amplified by the low-noise amplifier module, input into the second digital optical module for electrical / optical signal conversion, and finally transmitted to the fiber optic remote near-end device through optical fiber, thereby solving the signal coverage problem in remote areas and large and extra-large buildings.

[0021] Furthermore, the optical fiber extension proximal end device further includes a first electronic attenuator, and the input end of the first low noise amplifier is electrically connected to the first digital optical module through the first electronic attenuator.

[0022] As can be seen from the above description, a first electronic attenuator is provided to reduce the power of the input signal to a lower level to meet the needs of subsequent circuits and avoid circuit overload or distortion; its adjustable range is greater than or equal to 30dB.

[0023] Furthermore, the optical fiber extension proximal end device further includes a second electronic attenuator, and the output end of the second low noise amplifier is electrically connected to the first digital optical module through the second electronic attenuator.

[0024] As can be seen from the above description, a second electronic attenuator is provided to reduce the power of the input signal to a lower level to meet the needs of subsequent circuits and avoid circuit overload or distortion; its adjustable range is greater than or equal to 30dB.

[0025] Furthermore, the optical fiber extension remote device further includes a first filter, and the output end of the low-noise amplifier module is electrically connected to the second digital optical module through the first filter.

[0026] As can be seen from the above description, the first filter plays a role of frequency selection, and is capable of selecting signals within a specific frequency range and guiding them to a corresponding transmission or reception path.

[0027] Furthermore, the optical fiber extension remote device further includes a second filter, and the input end of the power amplification module is electrically connected to the second digital optical module through the second filter.

[0028] As can be seen from the above description, the second filter plays a role of frequency selection, and is capable of selecting signals within a specific frequency range and guiding them to the corresponding transmission or reception path.

[0029] Furthermore, the first digital optical module includes a first A / D converter, a first D / A converter, a first FPGA chip, a first MCU chip and a first SFP laser component. The first FPGA chip is electrically connected to the first A / D converter, the first D / A converter, the first MCU chip and the first SFP laser component respectively. The first A / D converter is electrically connected to the input end of the first low-noise amplifier, the first D / A converter is electrically connected to the output end of the second low-noise amplifier, and the first SFP laser component is electrically connected to the second digital optical module.

[0030] From the above description, it can be seen that the first digital optical module performs A / D conversion on the analog RF signal in the first A / D converter, outputs it to the first FPGA chip for digital processing, and transmits it to the second digital optical module through the first SFP laser component.

[0031] Furthermore, the second digital optical module includes a second A / D converter, a second D / A converter, a second FPGA chip, a second MCU chip and a second SFP laser assembly. The second FPGA chip is electrically connected to the second A / D converter, the second D / A converter, the second MCU chip and the second SFP laser assembly, respectively. The second D / A converter is electrically connected to the output end of the low-noise amplifier module, the second A / D converter is electrically connected to the input end of the power amplifier module, and the second SFP laser assembly is electrically connected to the first SFP laser assembly.

[0032] From the above description, it can be seen that the first digital optical module performs A / D analog-to-digital conversion on the analog RF signal in the first A / D converter, outputs it to the first FPGA chip for digital processing, transmits it to the second digital optical module through the first SFP laser component, receives it by the second SFP laser component and enters the second FPGA chip for processing, and then performs digital-to-module conversion in the second D / A converter to output the analog RF signal; the second digital optical module inputs the analog RF signal into the second A / D converter for A / D analog-to-digital conversion, and then inputs it into the second FPGA chip for digital processing, transmits it to the first digital optical module through the second SFP laser component, receives it by the first SFP laser component and enters the first FPGA chip for processing, and then performs digital-to-module conversion in the first D / A converter to output the analog RF signal.

[0033] Furthermore, it also includes a monitoring module, which is electrically connected to the first duplexer, the first low noise amplifier, the second low noise amplifier, the first digital optical module, the second digital optical module, the low noise amplifier module, the power amplifier module and the second duplexer respectively.

[0034] From the above description, it can be seen that the monitoring module can use RS485 communication to manage and control the fiber optic remote near-end device and each module in the fiber optic remote device, and can be connected to the PC monitoring platform; it can also interact with the modem.

[0035] Furthermore, the optical fiber extension proximal end device further includes a modem and a modulation and demodulation antenna, and the modem is electrically connected to the modulation and demodulation antenna and the monitoring module respectively.

[0036] From the above description, it can be seen that by setting up a modem and a modulation and demodulation antenna, the working status of the optical fiber remote and near-end device can be reported to the background via short messages, and the background also sends messages to the modem to the monitoring module for setting queries, etc.

[0037] Furthermore, it also includes a power supply module, which is electrically connected to the first duplexer, the first low noise amplifier, the second low noise amplifier, the first digital optical module, the second digital optical module, the low noise amplifier module, the power amplifier module and the second duplexer respectively.

[0038] As can be seen from the above description, the power module converts AC power into DC voltage, providing appropriate DC power and current to the various modules in the optical fiber extension proximal device and the optical fiber extension distal device for operation.

[0039] Please refer to Figure 1 and Figure 2 As shown, the first embodiment of the present utility model is:

[0040] Please refer to Figure 1 A PDT radio frequency remote device includes a fiber remote proximal end device 1 and at least one fiber remote end device 2. The fiber remote proximal end device 1 includes a base station antenna 101 (in this embodiment, a commercially available device), a first duplexer 102 (in this embodiment, a commercially available device), a first low-noise amplifier 103 (in this embodiment, a SKY65015-70LF device), a second low-noise amplifier 104 (in this embodiment, a SKY65015-70LF device), and a first digital optical module 105 (in this embodiment, a commercially available device). The fiber remote end device 2 includes a second digital optical module 201 (in this embodiment, a commercially available device), a low-noise amplifier module 202 (in this embodiment, a PL08 chip), a power amplifier module 203 (in this embodiment, an AFT05MS031N chip), a second duplexer 204 (in this embodiment, a commercially available device), and a retransmitting antenna 205 (in this embodiment, a commercially available device).

[0041] The first low noise amplifier 103 and the second low noise amplifier 104 can perform single-stage amplification on small radio frequency signals.

[0042] The first duplexer 102 and the second duplexer 204 can isolate the transmit and receive signals; the first duplexer 102 (or the second duplexer 204) uses a coupler and an isolator to achieve isolation of the transmit and receive signals; when the transmitting device generates a signal, the coupler guides part of the signal to the antenna for transmission, and the isolator prevents the transmit signal from flowing back to the receiving device; when the receiving device receives the signal, the coupler guides part of the signal to the receiver, and the isolator prevents the receive signal from entering the transmitting device; the filter in the first duplexer 102 (or the second duplexer 204) can play a role of frequency selection, which selects signals within a specific frequency range and guides them to the corresponding transmit or receive path.

[0043] Please refer to Figure 1 The first duplexer 102 is electrically connected to the base station antenna 101, the output end of the first low-noise amplifier 103, and the input end of the second low-noise amplifier 104, respectively. The first digital optical module 105 is electrically connected to the input end of the first low-noise amplifier 103, the output end of the second low-noise amplifier 104, and the second digital optical module 201, respectively. The second digital optical module 201 is electrically connected to the output end of the low-noise amplifier module 202 and the input end of the power amplifier module 203, respectively. The second duplexer 204 is electrically connected to the input end of the low-noise amplifier module 202, the output end of the power amplifier module 203, and the retransmission antenna 205, respectively.

[0044] The low noise amplifier module 202 is composed of a multi-stage low noise amplifier. When amplifying extremely weak radio frequency signals, the noise coefficient of the module itself is extremely low, approximately less than 0.8 dB, and has good linearity.

[0045] The power amplifier module 203 is mainly used to amplify the input signal to a higher power level. It uses a high-efficiency and high-linearity LDMOS power tube as the final amplifier tube, which has good linearity and high efficiency. When working at full power, the efficiency can reach more than 38%.

[0046] Please refer to Figure 1 The optical fiber extension proximal end device 1 further includes a first electronic attenuator 106 (model PE4306 used in this embodiment), and the input end of the first low noise amplifier 103 is electrically connected to the first digital optical module 105 through the first electronic attenuator 106.

[0047] Please refer to Figure 1 The optical fiber extension proximal end device 1 further includes a second electronic attenuator 107 (model PE4306 used in this embodiment), and the output end of the second low noise amplifier 104 is electrically connected to the first digital optical module 105 through the second electronic attenuator 107 .

[0048] Please refer to Figure 1 The optical fiber pulling remote device 2 further includes a first filter 206 (a commercially available device is used in this embodiment), and the output end of the low noise amplifier module 202 is electrically connected to the second digital optical module 201 through the first filter 206 .

[0049] Please refer to Figure 1 The optical fiber pulling remote device 2 further includes a second filter 207 (a commercially available device is used in this embodiment). The input end of the power amplification module 203 is electrically connected to the second digital optical module 201 through the second filter 207 .

[0050] Please refer to Figure 2The first digital optical module 105 includes a first A / D converter 1051 (the model used in this embodiment is ECR8668), a first D / A converter 1052 (the model used in this embodiment is ECR8668), a first FPGA chip 1053 (the model used in this embodiment is XC7K75T), a first MCU chip 1054 (the model used in this embodiment is STM32F407VET6) and a first SFP laser assembly 1055 (the model used in this embodiment is HBP 3524-L2DT), the first FPGA chip 1053 is electrically connected to the first A / D converter 1051, the first D / A converter 1052, the first MCU chip 1054 and the first SFP laser component 1055 respectively, the first A / D converter 1051 is electrically connected to the input end of the first low-noise amplifier 103, the first D / A converter 1052 is electrically connected to the output end of the second low-noise amplifier 104, and the first SFP laser component 1055 is electrically connected to the second digital optical module 201.

[0051] Please refer to Figure 2 The second digital optical module 201 includes a second A / D converter 2011 (the model used in this embodiment is ECR8668), a second D / A converter 2012 (the model used in this embodiment is ECR8668), a second FPGA chip 2013 (the model used in this embodiment is XC7K75T), a second MCU chip 2014 (the model used in this embodiment is STM32F407VET6) and a second SFP laser component 2015 (the model used in this embodiment is HBP3524-L2DT). The second FPGA chip 2013 is electrically connected to the second A / D converter 2011, the second D / A converter 2012, the second MCU chip 2014 and the second SFP laser component 2015 respectively. The second D / A converter 2012 is electrically connected to the output end of the low-noise amplifier module 202, and the second A / D converter 2011 is electrically connected to the input end of the power amplifier module 203.

[0052] It also includes a monitoring module (in this embodiment, a commercially available device is used), which is electrically connected to the first duplexer 102, the first low-noise amplifier 103, the second low-noise amplifier 104, the first digital optical module 105, the second digital optical module 201, the low-noise amplifier module 202, the power amplifier module 203, and the second duplexer 204.

[0053] The optical fiber extension proximal end device 1 further includes a modem 108 (a commercially available device is used in this embodiment) and a modulation and demodulation antenna 109 (a commercially available device is used in this embodiment). The modem 108 is electrically connected to the modulation and demodulation antenna 109 and the monitoring module respectively.

[0054] It also includes a power supply module (in this embodiment, a commercially available device is used), which is electrically connected to the first duplexer 102, the first low-noise amplifier 103, the second low-noise amplifier 104, the first digital optical module 105, the second digital optical module 201, the low-noise amplifier module 202, the power amplifier module 203, and the second duplexer 204 respectively.

[0055] The working principle of the above-mentioned PDT radio frequency remote device is as follows:

[0056] Fiber optic pull-out proximal end device 1:

[0057] Downlink: The base station downlink signal is partially coupled through the coupler in the first duplexer 102, and then transmitted to the BS end of the fiber optic remote near-end device 1 via a feeder line. The signal is then filtered and input through the first duplexer 102 at the BS end (out-of-band filtering to select in-band signals), and the required 360MHz signal is input into the system. The RF signal is amplified by the second low-noise amplifier 104, and the signal output is controlled by the second electronic attenuator 107. The output signal is digitized and converted into an electrical / optical signal by the first digital optical module 105. The optical signal is then transmitted to the fiber optic remote device 2 via optical fiber.

[0058] Uplink: The optical fiber extension remote device 2 transmits the uplink optical signal back through the optical fiber. After digital processing and optical / electrical conversion by the first digital optical module 105, the signal output is controlled by the first electronic attenuator 106, and then the RF signal is amplified by the second low-noise amplifier 104. The output signal is then filtered and output by the first duplexer 102. The required 350MHz signal is transmitted to the base station through the feeder and coupler.

[0059] Fiber optic extension remote device 2:

[0060] Downlink: The optical fiber remote near-end device 1 transmits the digitally processed downlink optical signal back through the optical fiber. After the optical / electrical conversion by the second digital optical module 201, it is filtered and output by the second filter 207. The output signal is then amplified and output by the power amplifier module 203 to amplify the required 360MHz signal. Finally, it is filtered and output to the retransmission antenna 205 through the second duplexer 204 for signal coverage of the blind area.

[0061] Uplink: The MS port of the fiber optic remote device 2 is connected to the retransmission antenna 205 to receive the uplink signal sent by the terminal; the received signal is filtered and output through the second duplexer 204, and the required 350M signal is input into the system; the signal is amplified by the low-noise amplifier module, and then output by the first filter 206 for secondary filtering. The filtered signal is input into the second digital optical module 201 for electrical / optical signal conversion, and finally transmitted to the fiber optic remote near-end device 1 through optical fiber.

[0062] The PDT radio frequency remote device designed in this scheme is a cost-effective device with low cost, simple installation, and small base station function. Due to its advantages such as short construction period, small investment, and full improvement of channel utilization, it will be increasingly widely used in PDT system network communications.

[0063] The PDT radio remote device designed in this solution is an extremely effective device used to make up for the insufficient coverage of the PDT system base station, expand the base station coverage range, and fill the coverage blind spots.

[0064] The PDT remote radio equipment designed in this solution has the following advantages:

[0065] (1) Since the output signal frequency is different from the input signal frequency, the dual time slot and transparent channel will not occupy more valuable frequency resources.

[0066] (2) Since the coverage area is far away from the base station and there is no co-channel interference, the retransmission antenna 205 covering the blind area can select an omnidirectional or directional antenna according to the terrain conditions, and the coverage mode is diverse.

[0067] (3) There is no isolation problem between the sending and receiving of wireless repeater stations, and the site selection is convenient.

[0068] The PDT radio frequency remote device designed in this solution can be flexibly used in conjunction with base stations. One optical fiber remote near-end device 1 is equipped with multiple (usually 1-4) optical fiber remote far-end devices 2 for signal coverage. Currently, optical fiber repeaters have been widely used in public network networks. The PDT radio frequency remote device uses public network optical fiber repeaters. The fiber remote near-end device 1 uses a directional antenna or base station coupling method to receive the downlink signal from the base station and sends it to the fiber remote near-end device 1. After filtering and attenuation, it is sent to the first digital optical module for electrical / optical conversion, emitting optical signals with a wavelength of 1.55μm and 1.31μm. It is then sent to the first SFP laser assembly and combined with the optical signal of the original transmission link (wavelength 1.31μm) to be transmitted via the optical cable to the fiber-optic extension remote device 2; the second SFP laser assembly separates the 1.31μm and 1.55μm wavelength optical signals, and allows the 1.55μm wavelength optical signal to be input into the second digital optical module for optical / electrical conversion, and restored to a downlink signal. It is then filtered and amplified by the power amplifier inside the fiber-optic extension remote device 2, and transmitted by the omnidirectional antenna to the mobile station. The uplink signal of the mobile station is sent back to the base station, thus completing the signal connection between the base station and the mobile station and establishing a call.

[0069] In summary, the present invention provides a PDT radio frequency remote device, which is provided by setting a fiber optic remote proximal device and a fiber optic remote far-end device. The fiber optic remote proximal device includes a first duplexer, a first low-noise amplifier, a second low-noise amplifier and a first digital optical module. The fiber optic remote far-end device includes a second digital optical module, a low-noise amplifier module, a power amplifier module and a second duplexer. The base station downlink signal is coupled to part of the downlink signal through the coupler in the first duplexer, and the required 360MHz signal is input into the system. The radio frequency signal is amplified by the second low-noise amplifier, and then digitized and converted into an electrical / optical signal by the first digital optical module. The optical signal is then transmitted to the fiber optic remote device via an optical fiber; the fiber optic remote device transmits the uplink optical signal back through the optical fiber, which is digitized and converted into an optical / electrical signal by the first digital optical module, and then the radio frequency signal is amplified by the second low-noise amplifier. After amplification, the output signal is filtered and output through the first duplexer, and the required 350MHz signal is transmitted to the base station through the feeder and coupler; the optical fiber remote near-end device returns the digitally processed downlink optical signal through the optical fiber, and after the optical / electrical conversion through the second digital optical module, the output signal is amplified and output through the power amplifier module, amplifying the required 360MHz signal, and finally output to the retransmission antenna through the second-level filtering of the second duplexer to provide signal coverage for the blind area; the MS port of the optical fiber remote device is connected to the retransmission antenna to receive the uplink signal sent by the terminal; the received signal is filtered and output through the second duplexer, and the required 350M signal is input into the system; the signal is amplified by the low-noise amplifier module, input into the second digital optical module for electrical / optical signal conversion, and finally transmitted to the optical fiber remote near-end device through optical fiber, thereby solving the signal coverage problem in remote areas and large and super-large buildings.

[0070] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A PDT radio frequency remote device, characterized in that: It includes a fiber pulling proximal device and a fiber pulling distal device, wherein the fiber pulling proximal device includes a first duplexer, a first low-noise amplifier, a second low-noise amplifier and a first digital optical module, and the fiber pulling distal device includes a second digital optical module, a low-noise amplifier module, a power amplifier module and a second duplexer; The first duplexer is electrically connected to the output end of the first low-noise amplifier and the input end of the second low-noise amplifier, respectively; the first digital optical module is electrically connected to the input end of the first low-noise amplifier, the output end of the second low-noise amplifier, and the second digital optical module, respectively; the second digital optical module is electrically connected to the output end of the low-noise amplifier module and the input end of the power amplifier module, respectively; and the second duplexer is electrically connected to the input end of the low-noise amplifier module and the output end of the power amplifier module, respectively.

2. The PDT radio remote device according to claim 1, characterized in that: The optical fiber extension proximal end device further includes a first electronic attenuator, and the input end of the first low noise amplifier is electrically connected to the first digital optical module through the first electronic attenuator.

3. The PDT radio remote device according to claim 1, characterized in that: The optical fiber extension proximal end device further includes a second electronic attenuator, and the output end of the second low noise amplifier is electrically connected to the first digital optical module through the second electronic attenuator.

4. The PDT radio remote device according to claim 1, characterized in that: The optical fiber extension remote device further includes a first filter, and the output end of the low-noise amplifier module is electrically connected to the second digital optical module through the first filter.

5. The PDT radio remote device according to claim 1, characterized in that: The optical fiber extension remote device further includes a second filter, and the input end of the power amplification module is electrically connected to the second digital optical module through the second filter.

6. The PDT radio remote device according to claim 1, characterized in that: The first digital optical module includes a first A / D converter, a first D / A converter, a first FPGA chip, a first MCU chip and a first SFP laser component. The first FPGA chip is electrically connected to the first A / D converter, the first D / A converter, the first MCU chip and the first SFP laser component respectively. The first A / D converter is electrically connected to the input end of the first low-noise amplifier, the first D / A converter is electrically connected to the output end of the second low-noise amplifier, and the first SFP laser component is electrically connected to the second digital optical module.

7. The PDT radio remote device according to claim 6, characterized in that: The second digital optical module includes a second A / D converter, a second D / A converter, a second FPGA chip, a second MCU chip and a second SFP laser assembly. The second FPGA chip is electrically connected to the second A / D converter, the second D / A converter, the second MCU chip and the second SFP laser assembly respectively. The second D / A converter is electrically connected to the output end of the low-noise amplifier module, the second A / D converter is electrically connected to the input end of the power amplifier module, and the second SFP laser assembly is electrically connected to the first SFP laser assembly.

8. The PDT radio remote device according to claim 1, characterized in that: It also includes a monitoring module, which is electrically connected to the first duplexer, the first low noise amplifier, the second low noise amplifier, the first digital optical module, the second digital optical module, the low noise amplifier module, the power amplifier module and the second duplexer respectively.

9. The PDT radio remote device according to claim 8, characterized in that: The optical fiber extension proximal end device further comprises a modem and a modulation and demodulation antenna, wherein the modem is electrically connected to the modulation and demodulation antenna and the monitoring module respectively.

10. The PDT radio remote device according to claim 1, characterized in that: It also includes a power supply module, which is electrically connected to the first duplexer, the first low noise amplifier, the second low noise amplifier, the first digital optical module, the second digital optical module, the low noise amplifier module, the power amplifier module and the second duplexer respectively.

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