Multi-system digital optical fiber radio frequency remote device

Abstract

The invention relates to the technical field of digital optical fiber remote control, in particular to a multi-system digital optical fiber radio frequency remote control device which comprises a radio frequency digital access device and a radio frequency remote control device. The radio frequency digital access device comprises a first information source radio frequency signal receiving and transmitting module, a second information source radio frequency signal receiving and transmitting module and a third information source radio frequency signal receiving and transmitting module which are different in working frequency band, and the radio frequency remote device comprises a first signal conversion module, a second signal conversion module and a third signal conversion module. The radio frequency digital access device can enable downlink radio frequency signals of three different frequency band information sources to enter a digital optical fiber radio frequency access equipment system in a wired coupling mode, and after the downlink radio frequency signals are converted into digital signals, the digital signals are converted into optical signals through photoelectricity, and the optical signals are transmitted to the radio frequency remote device. And the radio frequency remote device converts the digital signal issued by the radio frequency digital access device into a radio frequency signal, thereby realizing wireless coverage of three signals with different frequency bands.

Description

Technical Field

[0001] The present invention relates to the technical field of digital optical fiber remote control, and in particular to a multi-system digital optical fiber radio frequency remote control device. Background Art

[0002] In order to meet the needs of daily intercom communication, public security and fire emergency rescue, and broadcast signals for passing vehicles in tunnels, traditional tunnel communications: 350MHz public security and fire, 400MHz internal dispatch equipment are laid out separately to achieve signal coverage, which are relatively independent, but their respective deployment requires more cable and antenna resources, and the excess of cables and antennas also affects the beauty of the tunnel; the FM frequency band is relatively rarely used for coverage in tunnels. Once a vehicle cannot receive the broadcast signal in the tunnel, if an emergency occurs, the vehicles and personnel in the tunnel cannot receive the corresponding information in time, which is likely to expand the accident level and cause greater losses.

[0003] Traditional tunnel coverage basically adopts analog fiber optic transmission coverage. However, the radio frequency attenuates with the attenuation of the optical signal, the transmission distance is short, the bottom noise is high, and the influence on base station reception is great (shortening the communication distance), and only a one-near-one-far extension method can be achieved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a multi-system digital optical fiber radio frequency remote device to achieve multi-band coverage of digital private network communication.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A multi-system digital optical fiber radio remote device comprises a first universal public radio interface, a second universal public radio interface, a radio frequency digital access device and at least one radio remote device; The radio frequency digital access device includes a first information source radio frequency signal transceiver module, a second information source radio frequency signal transceiver module and a third information source radio frequency signal transceiver module, the first information source radio frequency signal transceiver module, the second information source radio frequency signal transceiver module and the third information source radio frequency signal transceiver module have different operating frequency bands, and the radio frequency remote device includes a first signal conversion module, a second signal conversion module and a third signal conversion module; The first information source RF signal transceiver module, the second information source RF signal transceiver module and the third information source RF signal transceiver module are all electrically connected to the first universal public radio interface, the first signal conversion module, the second signal conversion module and the third signal conversion module are all electrically connected to the second universal public radio interface, and the second universal public radio interface is connected to the first universal public radio interface via an optical fiber.

[0006] The beneficial effects of the present invention are: The present solution is provided with a radio frequency digital access device and at least one radio frequency remote device, the radio frequency digital access device comprises a first source radio frequency signal transceiver module, a second source radio frequency signal transceiver module and a third source radio frequency signal transceiver module, the first source radio frequency signal transceiver module, the second source radio frequency signal transceiver module and the third source radio frequency signal transceiver module have different working frequency bands, the radio frequency remote device comprises a first signal conversion module, a second signal conversion module and a third signal conversion module, the radio frequency digital access device can transmit downlink radio frequency signals of three different frequency band sources into the digital optical fiber radio frequency access device through wired coupling. The system converts the digital signal into a digital signal, which is then converted into an optical signal by photoelectric conversion and then transmitted to the RF remote device; at the same time, the digital signal uploaded by the RF remote device is converted into an uplink RF signal and transmitted back to the source by wire; the RF remote device converts the digital signal sent by the RF digital access device into an RF signal to achieve wireless coverage of three different frequency bands; at the same time, the uplink RF signal received wirelessly is converted into a digital signal and transmitted to the RF digital access device; this solution adopts digital optical fiber remote mode to achieve multi-band (FM emergency broadcast, 350MHz public security fire protection, 400MHz internal dispatch) coverage of digital private network communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a connection block diagram of the radio frequency digital access device of the multi-system digital optical fiber radio frequency remote device of the present invention; Figure 2 A connection block diagram of a radio remote device of a multi-system digital optical fiber radio remote device of the present invention; Description of labels: 1. First common public radio interface; 2. Second common public radio interface; 3. RF digital access device; 31. First source RF signal transceiver module; 311. Third low noise amplifier; 312. First digital frequency selection unit; 32. Second source RF signal transceiver module; 321. First co-frequency combiner; 322. Fourth low noise amplifier; 323. Second digital frequency selection unit; 33. Third source RF signal transceiver module; 331. Second co-frequency combiner; 332. Fifth low noise amplifier; 333. First digital signal processing unit; 4. RF remote device; 41. First signal conversion module; 411. Second digital signal processing unit; 412. First power amplifier; 413. Filter; 414. First retransmission antenna; 42. Second signal conversion module; 421. Third digital frequency selection unit; 422. Third same-frequency combiner; 423. First low-noise amplifier; 424. Second low-noise amplifier; 425. First duplexer; 426. Second duplexer; 427. Second retransmission antenna; 428. Third retransmission antenna; 43. Third signal conversion module; 431. Third digital signal processing unit; 432. Fourth same-frequency combiner; 433. Second power amplifier; 434. Third power amplifier. DETAILED DESCRIPTION

[0008] 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.

[0009] Please refer to Figure 1 and Figure 2 , the technical solution adopted by the present invention is: A multi-system digital optical fiber radio remote device comprises a first universal public radio interface, a second universal public radio interface, a radio frequency digital access device and at least one radio remote device; The radio frequency digital access device includes a first information source radio frequency signal transceiver module, a second information source radio frequency signal transceiver module and a third information source radio frequency signal transceiver module, the first information source radio frequency signal transceiver module, the second information source radio frequency signal transceiver module and the third information source radio frequency signal transceiver module have different operating frequency bands, and the radio frequency remote device includes a first signal conversion module, a second signal conversion module and a third signal conversion module; The first information source RF signal transceiver module, the second information source RF signal transceiver module and the third information source RF signal transceiver module are all electrically connected to the first universal public radio interface, the first signal conversion module, the second signal conversion module and the third signal conversion module are all electrically connected to the second universal public radio interface, and the second universal public radio interface is connected to the first universal public radio interface via an optical fiber.

[0010] From the above description, it can be seen that the beneficial effects of the present invention are: The present solution is provided with a radio frequency digital access device and at least one radio frequency remote device, the radio frequency digital access device comprises a first source radio frequency signal transceiver module, a second source radio frequency signal transceiver module and a third source radio frequency signal transceiver module, the first source radio frequency signal transceiver module, the second source radio frequency signal transceiver module and the third source radio frequency signal transceiver module have different working frequency bands, the radio frequency remote device comprises a first signal conversion module, a second signal conversion module and a third signal conversion module, the radio frequency digital access device can transmit downlink radio frequency signals of three different frequency band sources into the digital optical fiber radio frequency access device through wired coupling. The system converts the digital signal into a digital signal, which is then converted into an optical signal by photoelectric conversion and then transmitted to the RF remote device; at the same time, the digital signal uploaded by the RF remote device is converted into an uplink RF signal and transmitted back to the source by wire; the RF remote device converts the digital signal sent by the RF digital access device into an RF signal to achieve wireless coverage of three different frequency bands; at the same time, the uplink RF signal received wirelessly is converted into a digital signal and transmitted to the RF digital access device; this solution adopts digital optical fiber remote mode to achieve multi-band (FM emergency broadcast, 350MHz public security fire protection, 400MHz internal dispatch) coverage of digital private network communication.

[0011] Furthermore, the first source RF signal transceiver module includes a third low-noise amplifier and a first digital frequency selection unit, the input end of the third low-noise amplifier receives the FM radio signal through the base station antenna, and the output end of the third low-noise amplifier is electrically connected to the first signal conversion module through the digital frequency selection unit.

[0012] From the above description, it can be seen that the third low noise amplifier can amplify the small RF signals of the uplink and downlink signals; the first digital frequency selection unit down-converts the RF signal to the ADC to convert the RF signal into a digital signal, and performs software digital processing (frequency selection, band selection, etc.) on the FPGA, and outputs it to the universal public radio interface for modulation to the optical fiber for transmission to the remote end.

[0013] Furthermore, the second signal source RF signal transceiver module includes a first co-frequency combiner, a fourth low-noise amplifier and a second digital frequency selection unit, the first input end of the first co-frequency combiner receives a downlink 360MHz RF signal through a base station antenna, the second input end of the first co-frequency combiner receives a downlink 420MHz RF signal through a base station antenna, the first output end of the first co-frequency combiner is electrically connected to the input end of the fourth low-noise amplifier, the second output end of the first co-frequency combiner is grounded through a resistor, and the output end of the fourth low-noise amplifier is electrically connected to the third signal conversion module through the second digital frequency selection unit.

[0014] From the above description, it can be seen that the fourth low-noise amplifier can amplify the small RF signals of the uplink and downlink signals; the second digital frequency selection unit down-converts the RF signal to the ADC to convert the RF signal into a digital signal, and performs software digital processing (frequency selection, band selection, etc.) on the FPGA, and outputs it to the universal public radio interface for modulation to the optical fiber for transmission to the remote end; the first co-frequency combiner can synthesize two RF signals with high isolation and output them as one.

[0015] Furthermore, the third signal source RF signal transceiver module includes a second co-frequency combiner, a fifth low-noise amplifier and a first digital signal processing unit, the first input end of the second co-frequency combiner is electrically connected to the output end of the fifth low-noise amplifier, the second input end of the second co-frequency combiner is grounded through a resistor, and the input end of the fifth low-noise amplifier is electrically connected to the second signal conversion module through the first digital signal processing unit.

[0016] From the above description, it can be seen that the fifth low-noise amplifier can amplify the small RF signals of the uplink and downlink signals; the first digital signal processing unit converts the received optical signal into a digital signal, sends it to the FPGA for software digital processing (noise suppression, carrier tracking, etc.), and inputs it to the DAC (DAC is a digital-to-analog converter, also known as a D / A converter) to convert the digital signal into an analog signal, and then up-converts it to an RF signal.

[0017] Furthermore, the first signal conversion module includes a second digital signal processing unit, a first power amplifier, a filter and a first retransmitting antenna, the second digital signal processing unit is electrically connected to the first source RF signal transceiver module and the input end of the first power amplifier, respectively, the output end of the first power amplifier is electrically connected to the input end of the filter, and the output end of the filter is electrically connected to the first retransmitting antenna.

[0018] From the above description, it can be seen that the second digital signal processing unit converts the received optical signal into a digital signal, performs software digital processing (low noise suppression, carrier tracking, etc.) on the FPGA, and inputs it into the DAC (DAC is a digital-to-analog converter, also known as a D / A converter) to convert the digital signal into an analog signal, and then up-converts it to a radio frequency signal; the filter can allow specific frequency components in the signal to pass through, and can greatly attenuate and suppress other frequency components.

[0019] Further, the second signal conversion module includes a third digital frequency selection unit, a third same-frequency combiner, a first low-noise amplifier, a second low-noise amplifier, a first duplexer, a second duplexer, a second retransmission antenna, and a third retransmission antenna; The third digital frequency selection unit is electrically connected to the third source RF signal transceiver module and the first output end of the third same-frequency combiner, respectively; the second output end of the third same-frequency combiner is grounded through a resistor; the first input end of the third same-frequency combiner is electrically connected to the output end of the first low-noise amplifier; the second input end of the third same-frequency combiner is electrically connected to the output end of the second low-noise amplifier; the first duplexer is electrically connected to the second retransmission antenna, the input end of the first low-noise amplifier and the third signal conversion module, respectively; the second duplexer is electrically connected to the third retransmission antenna, the input end of the second low-noise amplifier and the third signal conversion module, respectively.

[0020] From the above description, it can be seen that the first low noise amplifier and the second low noise amplifier can perform low noise multi-stage amplification on the small RF signal to improve the output signal-to-noise ratio so that the system can obtain a smaller noise coefficient; the third digital frequency selection unit down-converts the RF signal to the ADC to convert the RF signal into a digital signal, and performs software digital processing (frequency selection, band selection, etc.) on the FPGA, and outputs it to the universal public radio interface for modulation to the optical fiber for transmission to the remote end.

[0021] Further, the third signal conversion module includes a third digital signal processing unit, a fourth same-frequency combiner, a second power amplifier and a third power amplifier; The third digital signal processing unit is electrically connected to the second source RF signal transceiver module and the first input end of the third co-frequency combiner respectively, the second input end of the third co-frequency combiner is grounded through a resistor, the first output end of the third co-frequency combiner is electrically connected to the input end of the second power amplifier, the second output end of the third co-frequency combiner is electrically connected to the input end of the third power amplifier, the output end of the second power amplifier is electrically connected to the second duplexer, and the output end of the third power amplifier is electrically connected to the first duplexer.

[0022] From the above description, it can be seen that the third digital signal processing unit converts the received optical signal into a digital signal, sends it to the FPGA for software digital processing (noise suppression, carrier tracking, etc.), inputs it to the DAC (DAC is a digital-to-analog converter, also known as a D / A converter) to convert the digital signal into an analog signal, and then up-converts it to a radio frequency signal.

[0023] Furthermore, the second power amplifier and the third power amplifier are both digital pre-distortion power amplifiers.

[0024] Furthermore, one radio frequency digital access device is connected to sixteen radio frequency remote devices in a chain manner.

[0025] Furthermore, one radio frequency digital access device is connected to four radio frequency remote devices in a star configuration.

[0026] Please refer to Figure 1 and Figure 2 As shown, the first embodiment of the present invention is: A multi-system digital optical fiber radio remote device, comprising a first universal public radio interface 1 (the model used in this embodiment is N / SMA-KKF), a second universal public radio interface 2 (the model used in this embodiment is N / SMA-KKF), a radio frequency digital access device 3 (also called "access device", in this embodiment, a device currently available on the market is used), and at least one radio remote device 4 (also called "remote device", in this embodiment, a device currently available on the market is used); Please refer to Figure 1 The radio frequency digital access device 3 includes a first information source radio frequency signal transceiver module 31, a second information source radio frequency signal transceiver module 32 and a third information source radio frequency signal transceiver module 33, the first information source radio frequency signal transceiver module 31, the second information source radio frequency signal transceiver module 32 and the third information source radio frequency signal transceiver module 33 have different operating frequency bands, and the radio frequency remote device 4 includes a first signal conversion module 41, a second signal conversion module 42 and a third signal conversion module 43; The first information source RF signal transceiver module 31, the second information source RF signal transceiver module 32 and the third information source RF signal transceiver module 33 are all electrically connected to the first universal public radio interface 1, the first signal conversion module 41, the second signal conversion module 42 and the third signal conversion module 43 are all electrically connected to the second universal public radio interface 2, and the second universal public radio interface 2 and the first universal public radio interface 1 are connected via optical fiber.

[0027] Please refer to Figure 1 The first source RF signal transceiver module 31 includes a third low noise amplifier 311 (the model used in this embodiment is SKY65015-70LF) and a first digital frequency selection unit 312 (the chip model used in this embodiment is XC7K100T). The input end of the third low noise amplifier 311 receives the FM radio signal through the base station antenna, and the output end of the third low noise amplifier 311 is electrically connected to the first signal conversion module 41 through the digital frequency selection unit.

[0028] Please refer to Figure 1The second source RF signal transceiver module 32 includes a first same-frequency combiner 321 (the model used in this embodiment is PD0900U03-070), a fourth low-noise amplifier 322 (the model used in this embodiment is PNH16) and a second digital frequency selection unit 323 (the chip model used in this embodiment is XC7K100T). The first input end of the first same-frequency combiner 321 receives a downlink 360MHz RF signal through a base station antenna, and the second input end of the first same-frequency combiner 321 receives a downlink 420MHz RF signal through a base station antenna. The first output end of the first same-frequency combiner 321 is electrically connected to the input end of the fourth low-noise amplifier 322, and the second output end of the first same-frequency combiner 321 is grounded through a resistor. The output end of the fourth low-noise amplifier 322 is electrically connected to the third signal conversion module 43 through the second digital frequency selection unit 323.

[0029] Please refer to Figure 1 The third signal source RF signal transceiver module 33 includes a second same-frequency combiner 331 (the model used in this embodiment is PD0900U03-070), a fifth low-noise amplifier 332 (the model used in this embodiment is PNH16) and a first digital signal processing unit 333 (the chip model used in this embodiment is XC7K100T), the first input end of the second same-frequency combiner 331 is electrically connected to the output end of the fifth low-noise amplifier 332, the second input end of the second same-frequency combiner 331 is grounded through a resistor, and the input end of the fifth low-noise amplifier 332 is electrically connected to the second signal conversion module 42 through the first digital signal processing unit 333.

[0030] Please refer to Figure 2 The first signal conversion module 41 includes a second digital signal processing unit 411 (a chip of model XC7K100T is used in this embodiment), a first power amplifier 412 (a chip of model GRF5040 is used in this embodiment), a filter 413 (a device currently available on the market is used in this embodiment) and a first retransmission antenna 414 (a device currently available on the market is used in this embodiment). The second digital signal processing unit 411 is electrically connected to the first source RF signal transceiver module 31 and the input end of the first power amplifier 412 respectively, the output end of the first power amplifier 412 is electrically connected to the input end of the filter 413, and the output end of the filter 413 is electrically connected to the first retransmission antenna 414.

[0031] Please refer to Figure 2The second signal conversion module 42 includes a third digital frequency selection unit 421 (a chip of model XC7K100T is used in this embodiment), a third same-frequency combiner 422 (a chip of model PD0900U03-070 is used in this embodiment), a first low-noise amplifier 423 (a chip of model PL08 is used in this embodiment), a second low-noise amplifier 424 (a chip of model PL08 is used in this embodiment), a first duplexer 425 (a device currently available on the market is used in this embodiment), a second duplexer 426 (a device currently available on the market is used in this embodiment), a second retransmission antenna 427 (a device currently available on the market is used in this embodiment), and a third retransmission antenna 428 (a device currently available on the market is used in this embodiment); The third digital frequency selection unit 421 is electrically connected to the third source RF signal transceiver module 33 and the first output end of the third on-frequency combiner 422 respectively, the second output end of the third on-frequency combiner 422 is grounded through a resistor, the first input end of the third on-frequency combiner 422 is electrically connected to the output end of the first low noise amplifier 423, the second input end of the third on-frequency combiner 422 is electrically connected to the output end of the second low noise amplifier 424, the first duplexer 425 is electrically connected to the second retransmission antenna 427, the input end of the first low noise amplifier 423 and the third signal conversion module 43 respectively, and the second duplexer 426 is electrically connected to the third retransmission antenna 428, the input end of the second low noise amplifier 424 and the third signal conversion module 43 respectively.

[0032] Please refer to Figure 2 , the third signal conversion module 43 includes a third digital signal processing unit 431 (a chip of model XC7K100T is used in this embodiment), a fourth same-frequency combiner 432 (a chip of model PD0900U03-070 is used in this embodiment), a second power amplifier 433 (a chip of model GRF5040 is used in this embodiment) and a third power amplifier 434 (a chip of model GRF5040 is used in this embodiment); The third digital signal processing unit 431 is electrically connected to the second source RF signal transceiver module 32 and the first input end of the third co-frequency combiner 422 respectively, the second input end of the third co-frequency combiner 422 is grounded through a resistor, the first output end of the third co-frequency combiner 422 is electrically connected to the input end of the second power amplifier 433, the second output end of the third co-frequency combiner 422 is electrically connected to the input end of the third power amplifier 434, the output end of the second power amplifier 433 is electrically connected to the second duplexer 426, and the output end of the third power amplifier 434 is electrically connected to the first duplexer 425.

[0033] The second power amplifier 433 and the third power amplifier 434 are both digital pre-distortion power amplifiers.

[0034] Common Public Radio Interface (CPRI) is a digital protocol for serial high-speed data transmission between two parts of a modern base station. It implements the physical connection between access equipment and remote equipment through optical fiber cables based on the digital protocol. The processed digital RF and other signals are transmitted bidirectionally to the near and far ends by the CPRI protocol via optical fiber.

[0035] The RF digital access device 3 and the RF remote device 4 support a point-to-multipoint star networking. One RF digital access device 3 can be connected to four RF remote devices 4 in a star configuration. Each RF digital access device 3 supports a chain connection of at least sixteen RF remote devices 4. Optical fiber transmission is used between the RF digital access device 3 and the RF remote device 4, and the maximum remote distance can reach 20km.

[0036] The first digital signal processing unit 333, the second digital signal processing unit 411 and the third digital signal processing unit 431 convert the optical signal received by the universal public radio interface into a digital signal, send it to the FPGA for software digital processing (noise suppression, carrier tracking, etc.), input it to the DAC (DAC is a digital-to-analog converter, also known as a D / A converter) to convert the digital signal into an analog signal, and then up-convert it into a radio frequency signal.

[0037] The third low noise amplifier 311 , the fourth low noise amplifier 322 and the fifth low noise amplifier 332 can amplify small radio frequency signals of uplink and downlink signals.

[0038] The first digital frequency selection unit 312, the second digital frequency selection unit 323 and the third digital frequency selection unit 421 down-convert the RF signal to the ADC to convert the RF signal into a digital signal, send it to the FPGA for software digital processing (frequency selection, band selection, etc.), output it to the universal public radio interface for modulation and transmission to the optical fiber to the remote end.

[0039] The first low noise amplifier 423 and the second low noise amplifier 424 can perform low noise multi-stage amplification on the small radio frequency signal to improve the output signal-to-noise ratio so that the system can obtain a smaller noise coefficient.

[0040] The first duplexer 425 and the second duplexer 426 separate / combine the uplink and downlink signals, and filter out the out-band signals or spurious signals, and perform high-suppression bandpass filtering on the uplink and downlink. The design adopts a cross-coupling method, which introduces radiation coupling between non-adjacent cavities to generate a transmission zero point near the passband, making the filtering from the passband to attenuation steeper, and has the characteristics of high out-of-band suppression, low adjacent channel leakage and small size.

[0041] The working principle of the multi-system digital optical fiber radio frequency remote equipment designed in this scheme is: FM radio signal link: FM radio signals are received from outside the tunnel through the base station antenna, enter the third low noise amplifier 311 of the radio frequency digital access device 3 for small signal amplification, and go to the first digital frequency selection unit 312 for down-conversion, analog-to-digital conversion (through ADC, ADC is an analog-to-digital converter, also known as A / D converter) and digital processing (through FPGA), and frequency selection processing is performed at the same time. The digital signal goes to the first universal public radio interface 1, is transmitted to the radio frequency remote device 4 through optical fiber, and is further processed by the second universal public radio interface 2 to the second digital signal processing unit 411 for digital-to-analog conversion (through DAC, DAC is a digital-to-analog converter, also known as D / A converter), converts the digital quantity into an analog signal, is amplified to a certain power value by the first power amplifier 412, is input to the filter 413 to suppress out-of-band spurious signals, and is transmitted by the FM retransmission antenna (i.e., the first retransmission antenna 414).

[0042] 350MHz (downlink: 360MHz; uplink: 350MHz) public security fire protection, 400MHz (downlink: 420MHz; uplink: 410MHz) private network intercom link: Downlink: The downlink 360MHz (downlink: 420MHz) RF signal coupled by the antenna end of the base station is combined by the first co-frequency combiner 321 and output to the fourth low-noise amplifier 322 for RF small signal amplification, and then to the second digital frequency selection unit 323 for down-conversion, analog-to-digital conversion (through ADC, ADC is an analog-to-digital converter, also known as A / D converter) and digital processing (through FPGA), and frequency selection processing is performed at the same time. The digital signal is sent to the first universal public radio interface 1, transmitted to the radio frequency remote device 4 through the optical fiber, and transmitted to the second universal public radio Interface 2 is further processed by the third digital signal processing unit 431 for digital-to-analog conversion (performed by DAC, DAC is a digital-to-analog converter, also known as D / A converter), and the digital quantity is converted into an analog signal, which is divided into two paths by the fourth co-frequency combiner 432 and amplified to a certain power value by the second power amplifier 433 and the third power amplifier 434, and then input into the second duplexer 426 and the first duplexer 425 to suppress out-of-band spurious signals, and is transmitted by the 360MHz retransmission antenna (i.e., the third retransmission antenna 428) and the 420MHz retransmission antenna (i.e., the second retransmission antenna 427).

[0043] Uplink: The uplink 350MHz and 410MHz RF small signals received by the 360MHz retransmission antenna (i.e., the third retransmission antenna 428) and the 420MHz retransmission antenna (i.e., the second retransmission antenna 427) enter the second duplexer 426 and the first duplexer 425 respectively to suppress out-of-band spurious signals, extract useful RF signals in the working band, and then enter the first low-noise amplifier 423 and the second low-noise amplifier 424 for low-noise amplification, and then are combined by the third co-frequency combiner 422 to enter the third digital frequency selection unit 421 for down-conversion and analog-to-digital conversion (through ADC, ADC is an analog-to-digital converter, The digital signal is transmitted to the second universal public radio interface 2, transmitted to the radio frequency digital access device 3 through the optical fiber, and then to the first digital signal processing unit 333 via the first universal public radio interface 1, and is digitized (processed by FPGA) and converted into digital-to-analog (converted by DAC, DAC is a digital-to-analog converter, also known as D / A converter). The digital quantity is converted into an analog signal, which is output to the fifth low-noise amplifier 332 and then divided into two paths of 350MHz and 410MHz by the second co-frequency combiner 331 and output to the base station antenna end for coupling and reception by the base station.

[0044] In summary, the present invention provides a multi-system digital optical fiber radio frequency remote device, which is provided by setting a radio frequency digital access device and at least one radio frequency remote device, wherein the radio frequency digital access device includes a first signal source radio frequency signal transceiver module, a second signal source radio frequency signal transceiver module and a third signal source radio frequency signal transceiver module, and the first signal source radio frequency signal transceiver module, the second signal source radio frequency signal transceiver module and the third signal source radio frequency signal transceiver module have different working frequency bands, and the radio frequency remote device includes a first signal conversion module, a second signal conversion module and a third signal conversion module, and the radio frequency digital access device can convert the downlink radio frequency signals of the three signal sources of different frequency bands through a wired coupling method. The digital fiber optic RF access equipment system is converted into a digital signal, which is then converted into an optical signal through optoelectronic conversion and then transmitted to the RF remote device; at the same time, the digital signal uploaded by the RF remote device is converted into an uplink RF signal and transmitted back to the source through a wired method; the RF remote device converts the digital signal sent by the RF digital access device into an RF signal to achieve wireless coverage of three different frequency bands; at the same time, the uplink RF signal received wirelessly is converted into a digital signal and transmitted to the RF digital access device; this solution adopts the digital fiber optic remote method to achieve multi-band (FM emergency broadcasting, 350MHz public security fire protection, 400MHz internal dispatch) coverage of digital private network communications.

[0045] 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 multi-system digital optical fiber radio remote device, characterized in that: The device comprises a first universal public radio interface, a second universal public radio interface, a radio frequency digital access device and at least one radio frequency remote device; The radio frequency digital access device includes a first information source radio frequency signal transceiver module, a second information source radio frequency signal transceiver module and a third information source radio frequency signal transceiver module, the first information source radio frequency signal transceiver module, the second information source radio frequency signal transceiver module and the third information source radio frequency signal transceiver module have different operating frequency bands, and the radio frequency remote device includes a first signal conversion module, a second signal conversion module and a third signal conversion module; The first information source RF signal transceiver module, the second information source RF signal transceiver module and the third information source RF signal transceiver module are all electrically connected to the first universal public radio interface, the first signal conversion module, the second signal conversion module and the third signal conversion module are all electrically connected to the second universal public radio interface, and the second universal public radio interface is connected to the first universal public radio interface via an optical fiber.

2. The multi-system digital optical fiber radio remote device according to claim 1, characterized in that: The first source RF signal transceiver module includes a third low noise amplifier and a first digital frequency selection unit. The input end of the third low noise amplifier receives the FM broadcast signal through the base station antenna, and the output end of the third low noise amplifier is electrically connected to the first signal conversion module through the digital frequency selection unit.

3. The multi-system digital optical fiber radio remote device according to claim 1, characterized in that: The second source RF signal transceiver module includes a first co-frequency combiner, a fourth low-noise amplifier and a second digital frequency selection unit. The first input end of the first co-frequency combiner receives a downlink 360MHz RF signal through a base station antenna, and the second input end of the first co-frequency combiner receives a downlink 420MHz RF signal through a base station antenna. The first output end of the first co-frequency combiner is electrically connected to the input end of the fourth low-noise amplifier, the second output end of the first co-frequency combiner is grounded through a resistor, and the output end of the fourth low-noise amplifier is electrically connected to the third signal conversion module through the second digital frequency selection unit.

4. The multi-system digital optical fiber radio remote device according to claim 1, characterized in that: The third signal source RF signal transceiver module includes a second co-frequency combiner, a fifth low-noise amplifier and a first digital signal processing unit. The first input end of the second co-frequency combiner is electrically connected to the output end of the fifth low-noise amplifier. The second input end of the second co-frequency combiner is grounded through a resistor. The input end of the fifth low-noise amplifier is electrically connected to the second signal conversion module through the first digital signal processing unit.

5. The multi-system digital optical fiber radio remote device according to claim 1, characterized in that: The first signal conversion module includes a second digital signal processing unit, a first power amplifier, a filter and a first retransmitting antenna. The second digital signal processing unit is electrically connected to the first source RF signal transceiver module and the input end of the first power amplifier, respectively. The output end of the first power amplifier is electrically connected to the input end of the filter, and the output end of the filter is electrically connected to the first retransmitting antenna.

6. The multi-system digital optical fiber radio remote device according to claim 1, characterized in that: The second signal conversion module includes a third digital frequency selection unit, a third same-frequency combiner, a first low-noise amplifier, a second low-noise amplifier, a first duplexer, a second duplexer, a second retransmission antenna, and a third retransmission antenna; The third digital frequency selection unit is electrically connected to the third source RF signal transceiver module and the first output end of the third same-frequency combiner, respectively; the second output end of the third same-frequency combiner is grounded through a resistor; the first input end of the third same-frequency combiner is electrically connected to the output end of the first low-noise amplifier; the second input end of the third same-frequency combiner is electrically connected to the output end of the second low-noise amplifier; the first duplexer is electrically connected to the second retransmission antenna, the input end of the first low-noise amplifier and the third signal conversion module, respectively; the second duplexer is electrically connected to the third retransmission antenna, the input end of the second low-noise amplifier and the third signal conversion module, respectively.

7. The multi-system digital optical fiber radio remote device according to claim 6, characterized in that: The third signal conversion module includes a third digital signal processing unit, a fourth same-frequency combiner, a second power amplifier and a third power amplifier; The third digital signal processing unit is electrically connected to the second source RF signal transceiver module and the first input end of the third co-frequency combiner respectively, the second input end of the third co-frequency combiner is grounded through a resistor, the first output end of the third co-frequency combiner is electrically connected to the input end of the second power amplifier, the second output end of the third co-frequency combiner is electrically connected to the input end of the third power amplifier, the output end of the second power amplifier is electrically connected to the second duplexer, and the output end of the third power amplifier is electrically connected to the first duplexer.

8. The multi-system digital optical fiber radio remote device according to claim 7, characterized in that: The second power amplifier and the third power amplifier are both digital pre-distortion power amplifiers.

9. The multi-system digital optical fiber radio remote device according to claim 1, characterized in that: One radio frequency digital access device is connected to sixteen radio frequency remote devices in a chain manner.

10. The multi-system digital optical fiber radio remote device according to claim 1, characterized in that: One radio frequency digital access device is connected to four radio frequency remote devices in a star configuration.

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