PDT radio remote device
By using optical fiber remote equipment in the PDT system, using optical fiber transmission and digital optical modules for signal amplification and processing, the problem of insufficient signal coverage in remote areas and large buildings is solved, effective signal coverage is achieved, and cost and Complexity.
Patent Information
- Application Number
- CN202411480174.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2024-12-13
AI Technical Summary
In remote areas and in large and super-large buildings, the signal coverage of the PDT system is insufficient, resulting in problems with weak signal areas and blind spots.
A PDT radio frequency stretching device is adopted, including optical fiber long and near end device and optical fiber long and far end device, and is transmitted through optical fiber using base station antenna, duplexer, low noise amplifier, digital optical module, power amplifier module and retransmission antenna. Perform signal amplification and processing to cover the signal blind spot.
It effectively solves the signal coverage problem in remote areas and large buildings, improves the coverage and quality of communication signals, and reduces equipment costs and infrastructure complexity.
Smart Images
Figure CN119135268A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of digital cluster communication, and 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 with traditional analog trunking communication technology, the PDT system has higher communication capacity, lower interference and more stable signal transmission; this means that in an emergency, rescue teams can communicate with the command center and other rescue teams more quickly and safely; When the PDT system network is widely used, the requirements for network coverage and network quality are getting higher and higher; due to the influence of coverage environment factors, the coverage area of wireless communication will produce weak signal areas and blind spots, such as some remote areas, large buildings, canyons, subways, tunnels, factories and mines, etc.; the cost of setting up new base stations is too high and the infrastructure is also relatively complex; therefore, in order to facilitate the promotion and application of the PDT system, it is necessary to use cheaper and more reliable equipment to solve the signal coverage problem. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a PDT radio frequency remote device, which can solve the signal coverage situation in remote areas and large and super-large buildings.
[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A PDT radio frequency remote device comprises a near-end optical fiber remote device and at least one far-end optical fiber remote device, wherein the near-end optical fiber remote device comprises a base station antenna, a first duplexer, a first low-noise amplifier, a second low-noise amplifier and a first digital optical module, and the far-end optical fiber remote device comprises a second digital optical module, a low-noise amplifier module, a power amplifier module, a second duplexer and a retransmission antenna; The first duplexer is electrically connected to the base station antenna, 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, the output end of the power amplifier module and the retransmission antenna, respectively.
[0005] The beneficial effects of the present invention are: The scheme is provided with a near-end fiber extension device and at least one far-end fiber extension device, wherein the near-end fiber extension device comprises a base station antenna, a first duplexer, a first low-noise amplifier, a second low-noise amplifier and a first digital optical module, and the far-end fiber extension device comprises a second digital optical module, a low-noise amplifier module, a power amplifier module, a second duplexer and a retransmission antenna, wherein the base station downlink signal is coupled with part of the downlink signal through a coupler in the first duplexer, and the required 360MHz signal is input into the system, and the radio frequency signal is amplified through the second low-noise amplifier, and then the digital processing and electrical / optical signal conversion are performed through the first digital optical module, and the optical signal is then transmitted to the far-end fiber extension device via the optical fiber; the far-end fiber extension device transmits the uplink optical signal back through the optical fiber, and after the digital processing and optical / electrical conversion are performed by the first digital optical module, the radio frequency signal is amplified by the second low-noise amplifier. , the output signal is filtered and output by the first duplexer, and the required 350MHz signal is transmitted to the base station through the feeder and the coupler; the optical fiber remote near-end device transmits the digitally processed downlink optical signal back through the optical fiber, and after the optical / electrical conversion by the second digital optical module, the output signal is amplified and output by the power amplifier module, and the required 360MHz signal is amplified, and finally output to the retransmission antenna through the second duplexer secondary filtering to cover 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 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 optical fiber remote near-end device through optical fiber, thereby solving the signal coverage problem in remote areas and large and super-large buildings. BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Figure 1 A connection block diagram of a PDT radio frequency remote device of the present invention; Figure 2 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; Description of labels: 1. Optical fiber pulling 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. Modulation and demodulation antenna; 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
[0007] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.
[0008] Please refer to Figure 1 , the technical solution adopted by the present invention is: A PDT radio frequency remote device comprises a near-end optical fiber remote device and at least one far-end optical fiber remote device, wherein the near-end optical fiber remote device comprises a base station antenna, a first duplexer, a first low-noise amplifier, a second low-noise amplifier and a first digital optical module, and the far-end optical fiber remote device comprises a second digital optical module, a low-noise amplifier module, a power amplifier module, a second duplexer and a retransmission antenna; The first duplexer is electrically connected to the base station antenna, 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, the output end of the power amplifier module and the retransmission antenna, respectively.
[0009] From the above description, it can be seen that the beneficial effects of the present invention are: The scheme is provided with a near-end fiber extension device and at least one far-end fiber extension device, wherein the near-end fiber extension device comprises a base station antenna, a first duplexer, a first low-noise amplifier, a second low-noise amplifier and a first digital optical module, and the far-end fiber extension device comprises a second digital optical module, a low-noise amplifier module, a power amplifier module, a second duplexer and a retransmission antenna, wherein the base station downlink signal is coupled with part of the downlink signal through a coupler in the first duplexer, and the required 360MHz signal is input into the system, and the radio frequency signal is amplified through the second low-noise amplifier, and then the digital processing and electrical / optical signal conversion are performed through the first digital optical module, and the optical signal is then transmitted to the far-end fiber extension device via the optical fiber; the far-end fiber extension device transmits the uplink optical signal back through the optical fiber, and after the digital processing and optical / electrical conversion are performed by the first digital optical module, the radio frequency signal is amplified by the second low-noise amplifier. , the output signal is filtered and output by the first duplexer, and the required 350MHz signal is transmitted to the base station through the feeder and the coupler; the optical fiber remote near-end device transmits the digitally processed downlink optical signal back through the optical fiber, and after the optical / electrical conversion by the second digital optical module, the output signal is amplified and output by the power amplifier module, and the required 360MHz signal is amplified, and finally output to the retransmission antenna through the second duplexer secondary filtering to cover 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 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 optical fiber remote near-end device through optical fiber, thereby solving the signal coverage problem in remote areas and large and super-large buildings.
[0010] Furthermore, the optical fiber extension proximal end device also 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.
[0011] From the above description, it can be seen that the first electronic attenuator is set 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.
[0012] Furthermore, the optical fiber extension proximal end device also 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.
[0013] From the above description, it can be seen that 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.
[0014] Furthermore, the optical fiber pulling remote device also 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.
[0015] It can be seen from the above description that the first filter plays a role of frequency selection, and can select signals within a specific frequency range and guide them to the corresponding transmission or reception path.
[0016] Furthermore, the optical fiber pulling remote device also includes a second filter, and the input end of the power amplifier module is electrically connected to the second digital optical module through the second filter.
[0017] It can be seen from the above description that the second filter plays a role of frequency selection, and can select signals within a specific frequency range and guide them to the corresponding transmission or reception path.
[0018] 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.
[0019] 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, and transmits it to the second digital optical module through the first SFP laser component.
[0020] 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 component. 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 component, 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 component is electrically connected to the first SFP laser component.
[0021] 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.
[0022] 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 amplification module, the power amplification module and the second duplexer respectively.
[0023] From the above description, it can be seen that the monitoring module can use RS485 communication to manage and control the various modules in the fiber optic remote near-end device and the fiber optic remote far-end device, and can be connected to the PC monitoring platform; it can also interact with the modem.
[0024] Furthermore, the optical fiber extension proximal end device also 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.
[0025] 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.
[0026] 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.
[0027] From the above description, it can be known that the power module converts AC power into DC voltage, and provides appropriate DC power and current to each module in the optical fiber extension proximal device and the optical fiber extension distal device for operation.
[0028] Please refer to Figure 1 and Figure 2 As shown, the first embodiment of the present invention is: Please refer to Figure 1A PDT radio frequency remote device comprises a fiber remote proximal device 1 and at least one fiber remote device 2, wherein the fiber remote proximal device 1 comprises a base station antenna 101 (in this embodiment, an existing device on the market is used), a first duplexer 102 (in this embodiment, an existing device on the market is used), a first low noise amplifier 103 (in this embodiment, the model used is SKY65015-70LF), a second low noise amplifier 104 (in this embodiment, the model used is SKY65015-70LF) and a first digital optical module 105 (in this embodiment, an existing device on the market is used), and the fiber remote device 2 comprises a second digital optical module 201 (in this embodiment, an existing device on the market is used), a low noise amplifier module 202 (in this embodiment, a chip of model PL08 is used), a power amplifier module 203 (in this embodiment, a chip of model AFT05MS031N is used), a second duplexer 204 (in this embodiment, an existing device on the market is used) and a retransmission antenna 205 (in this embodiment, an existing device on the market is used); The first low noise amplifier 103 and the second low noise amplifier 104 can perform single-stage amplification on small-signal radio frequency signals.
[0029] 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 isolate the transmit and receive signals; when the transmitting device generates a signal, the coupler guides a 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 a 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 in frequency selection, which selects signals within a specific frequency range and guides them to the corresponding transmit or receive path.
[0030] 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, and 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.
[0031] The low noise amplifier module 202 is composed of a multi-stage low noise amplifier. When amplifying an extremely weak radio frequency signal, the noise coefficient of the module itself is extremely low, about less than 0.8 dB, and has good linearity.
[0032] 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. The efficiency can reach more than 38% when working at full power.
[0033] Please refer to Figure 1 The optical fiber extension proximal end device 1 further includes a first electronic attenuator 106 (the model used in this embodiment is PE4306), 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.
[0034] Please refer to Figure 1 The optical fiber extension proximal end device 1 further includes a second electronic attenuator 107 (the model used in this embodiment is PE4306), 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.
[0035] Please refer to Figure 1 The optical fiber pulling remote device 2 further includes a first filter 206 (an existing device on the market 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 .
[0036] Please refer to Figure 1 The optical fiber pulling remote device 2 further includes a second filter 207 (a device currently available on the market is used in this embodiment), and the input end of the power amplification module 203 is electrically connected to the second digital optical module 201 through the second filter 207 .
[0037] 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 component 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.
[0038] 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.
[0039] It also includes a monitoring module (in this embodiment, a device currently available on the market 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 amplification module 202, the power amplification module 203 and the second duplexer 204 respectively.
[0040] The optical fiber extension proximal end device 1 further includes a modem 108 (an existing device on the market is used in this embodiment) and a modulation and demodulation antenna 109 (an existing device on the market is used in this embodiment), and the modem 108 is electrically connected to the modulation and demodulation antenna 109 and the monitoring module respectively.
[0041] It also includes a power supply module (an existing device on the market is used in this embodiment), 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.
[0042] The working principle of the above-mentioned PDT radio frequency remote device is: Fiber optic extension proximal device 1: Downlink: The base station downlink signal is coupled with part of the downlink signal through the coupler in the first duplexer 102, and then transmitted to the BS end of the optical fiber extension near-end device 1 through the feeder line, and then filtered and inputted (out-of-band filtering, selecting in-band signals) through the first duplexer 102 at the BS end, 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 electrical / optical signals through the first digital optical module 105, and the optical signal is then transmitted to the optical fiber extension far-end device 2 via optical fiber.
[0043] 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 the RF signal is amplified by the second low-noise amplifier 104. The output signal is filtered and output by the first duplexer 102, and the required 350MHz signal is transmitted to the base station through the feeder and coupler.
[0044] Optical fiber pulling remote device 2: Downlink: The optical fiber remote proximal device 1 transmits the digitally processed downlink optical signal back through the optical fiber, which is optically / electrically converted by the second digital optical module 201, filtered and output by the second filter 207, and the output signal is amplified and output by the power amplifier module 203 to amplify the required 360MHz signal, and finally output to the retransmission antenna 205 through the second duplexer 204 for secondary filtering to cover the blind area.
[0045] 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 via 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 proximal device 1 via optical fiber.
[0046] 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. It will be more and more widely used in PDT system network communications due to its advantages such as short construction period, small investment, and full improvement of channel utilization.
[0047] The PDT radio frequency 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 area.
[0048] The PDT radio frequency remote device designed in this scheme has the following advantages: (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.
[0049] (2) Since the coverage area is far 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.
[0050] (3) There is no isolation problem between the sending and receiving of wireless repeaters, and the site selection is convenient.
[0051] The PDT radio frequency remote device designed in this scheme can be flexibly used in conjunction with the base station. 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. At present, optical fiber repeaters have been widely used in public network networking; 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 of the base station and sends it to the fiber remote near-end device 1. After filtering and attenuation processing, it is sent to the first digital optical module for electrical / optical conversion, and emits optical signals with a wavelength of 1.55μm & 1.31μm. It is then sent to the first SFP laser component and combined with the optical signal (wavelength 1.31μm) of the original transmission link and transmitted to the fiber-optic remote device 2 via the optical cable; the second SFP laser component separates the optical signals of 1.31μm and 1.55μm wavelengths, and inputs the optical signal of 1.55μm wavelength into the second digital optical module for optical / electrical conversion, and is restored to a downlink signal, which is then filtered and amplified by the power amplifier inside the fiber-optic 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.
[0052] In summary, the present invention provides a PDT radio frequency remote device, which is provided with a near-end optical fiber remote device and at least one far-end optical fiber remote device, wherein the near-end optical fiber remote device includes a base station antenna, a first duplexer, a first low-noise amplifier, a second low-noise amplifier and a first digital optical module, and the far-end optical fiber remote device includes a second digital optical module, a low-noise amplifier module, a power amplifier module, a second duplexer and a retransmission antenna, wherein the base station downlink signal is coupled to part of the downlink signal through a coupler in the first duplexer, and the required 360MHz signal is input into the system, and the radio frequency signal is amplified through the second low-noise amplifier, and then digitized and converted into electric / optical signals through the first digital optical module, and the optical signal is then transmitted to the far-end optical fiber remote device via optical fiber; the far-end optical fiber remote device transmits the uplink optical signal back through the optical fiber, and after being digitized and converted into electric / optical signals by the first digital optical module, it is then transmitted to the far-end optical fiber remote device via optical fiber. The device amplifies the RF signal, and 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 the 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, and the required 360MHz signal is amplified, and finally output to the retransmission antenna through the second duplexer secondary filtering to cover 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 the optical fiber, thereby solving the signal coverage problem in remote areas and large and super-large buildings.
[0053] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, 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 near-end device and at least one fiber pulling far-end device, the fiber pulling near-end device includes a base station antenna, a first duplexer, a first low-noise amplifier, a second low-noise amplifier and a first digital optical module, and the fiber pulling far-end device includes a second digital optical module, a low-noise amplifier module, a power amplifier module, a second duplexer and a retransmission antenna; The first duplexer is electrically connected to the base station antenna, 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, the output end of the power amplifier module and the retransmission antenna, respectively.
2. The PDT radio frequency 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 frequency remote device according to claim 1, characterized in that: The optical fiber extension proximal end device further comprises 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 frequency 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 frequency remote device according to claim 1, characterized in that: The optical fiber pulling 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 frequency 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 frequency 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 component. 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 component 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 component is electrically connected to the first SFP laser component.
8. The PDT radio frequency 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 amplification module, the power amplification module and the second duplexer respectively.
9. The PDT radio frequency 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, and 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.