Multi-system digital optical fiber radio frequency remote device

Abstract

The utility model relates to the technical field of digital optical fiber remote devices, in particular to a multi-system digital optical fiber radio frequency remote device, which comprises a radio frequency digital access device and a radio frequency remote 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 utility model 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. Background Art

[0002] In order to meet the needs of daily intercom communications, public security and fire emergency rescue, and broadcast signals for passing vehicles in tunnels, traditional tunnel communications: 350MHz public security and firefighting, and 400MHz internal dispatch equipment are deployed separately to achieve signal coverage. Although relatively independent, their separate deployment requires more cables and antennas, which also affects the aesthetics of the tunnel. The FM frequency band is relatively rarely used for coverage in tunnels. If a vehicle broadcasts signals in the tunnel, it cannot be received. In the event of an emergency, vehicles and personnel in the tunnel cannot receive the corresponding information in a timely manner, which can easily escalate the accident and cause greater losses.

[0003] Traditional tunnel coverage basically uses analog fiber optic transmission coverage. However, the radio frequency attenuates as the optical signal attenuates, the transmission distance is short, the bottom noise is high, and it has a great impact on base station reception (shortening the communication distance), and can only achieve a one-near and one-far extension method. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a multi-system digital optical fiber radio frequency remote device, which realizes multi-band coverage digital private network communication.

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

[0006] A multi-system digital optical fiber radio frequency remote device, comprising a radio frequency digital access device and a radio frequency remote device;

[0007] 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, wherein 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 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;

[0008] The first signal source RF signal transceiver module is electrically connected to the first signal conversion module, the second signal source RF signal transceiver module is electrically connected to the third signal conversion module, and the third signal source RF signal transceiver module is electrically connected to the second signal conversion module.

[0009] The beneficial effects of the present invention are:

[0010] This solution sets up a radio frequency digital access device and a radio frequency remote device. 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. 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 operating frequency bands. The radio frequency remote device includes a first signal conversion module, a second signal conversion module and a third signal conversion module. The radio frequency digital access device can transmit the downlink radio frequency signals of the three different frequency band signal sources into the digital optical fiber radio frequency access equipment system through wired coupling. , converted into a digital signal, and then converted into an optical signal through optoelectronics and transmitted to the radio frequency remote device; at the same time, the digital signal uploaded by the radio frequency remote device is converted into an uplink radio frequency signal and transmitted back to the source through a wired method; the radio frequency remote device converts the digital signal sent by the radio frequency digital access device into a radio frequency signal to achieve wireless coverage of three different frequency bands; at the same time, the uplink radio frequency signal received wirelessly is converted into a digital signal and transmitted to the radio frequency digital access device; this solution adopts digital optical fiber remote mode to achieve multi-band (FM emergency broadcast, 350M public security fire protection, 400M internal dispatch) coverage of digital private network communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a connection block diagram of the radio frequency digital access device of the multi-system digital optical fiber radio frequency remote equipment of the utility model;

[0012] Figure 2 This is a connection block diagram of the radio remote device of the multi-system digital optical fiber radio remote equipment of the present invention;

[0013] Description of labels:

[0014] 1. First Universal Public Radio Interface;

[0015] 2. Second Universal Public Radio Interface;

[0016] 3. RF digital access device; 31. First signal source RF signal transceiver module; 311. Third low-noise amplifier; 312. First digital frequency selection unit; 32. Second signal source RF signal transceiver module; 321. First on-frequency combiner; 322. Fourth low-noise amplifier; 323. Second digital frequency selection unit; 33. Third signal source RF signal transceiver module; 331. Second on-frequency combiner; 332. Fifth low-noise amplifier; 333. First digital signal processing unit;

[0017] 4. Radio frequency 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

[0018] 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.

[0019] Please refer to Figure 1 and Figure 2 , the technical solution adopted by this utility model is:

[0020] A multi-system digital optical fiber radio frequency remote device, comprising a radio frequency digital access device and a radio frequency remote device;

[0021] 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, wherein 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 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;

[0022] The first signal source RF signal transceiver module is electrically connected to the first signal conversion module, the second signal source RF signal transceiver module is electrically connected to the third signal conversion module, and the third signal source RF signal transceiver module is electrically connected to the second signal conversion module.

[0023] From the above description, it can be seen that the beneficial effects of the present invention are:

[0024] This solution sets up a radio frequency digital access device and a radio frequency remote device. 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. 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 operating frequency bands. The radio frequency remote device includes a first signal conversion module, a second signal conversion module and a third signal conversion module. The radio frequency digital access device can transmit the downlink radio frequency signals of the three different frequency band signal sources into the digital optical fiber radio frequency access equipment system through wired coupling. , converted into a digital signal, and then converted into an optical signal through optoelectronics and transmitted to the radio frequency remote device; at the same time, the digital signal uploaded by the radio frequency remote device is converted into an uplink radio frequency signal and transmitted back to the source through a wired method; the radio frequency remote device converts the digital signal sent by the radio frequency digital access device into a radio frequency signal to achieve wireless coverage of three different frequency bands; at the same time, the uplink radio frequency signal received wirelessly is converted into a digital signal and transmitted to the radio frequency digital access device; this solution adopts digital optical fiber remote mode to achieve multi-band (FM emergency broadcast, 350M public security fire protection, 400M internal dispatch) coverage of digital private network communication.

[0025] 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.

[0026] 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 then sends it to the FPGA for software digital processing (frequency selection, band selection, etc.), and outputs it to the universal public radio interface for modulation and optical fiber transmission to the remote end.

[0027] Furthermore, the second signal source RF signal transceiver module includes a first on-frequency combiner, a fourth low-noise amplifier and a second digital frequency selection unit, the first input end of the first on-frequency combiner receives a downlink 360MHz RF signal through the base station antenna, the second input end of the first on-frequency combiner receives a downlink 420MHz RF signal through the base station antenna, the first output end of the first on-frequency combiner is electrically connected to the input end of the fourth low-noise amplifier, the second output end of the first on-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.

[0028] 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 then sends it to the FPGA for software digital processing (frequency selection, band selection, etc.), and outputs it to the universal public radio interface for modulation and optical fiber transmission to the remote end.

[0029] Furthermore, the third signal source RF signal transceiver module includes a second on-frequency combiner, a fifth low-noise amplifier and a first digital signal processing unit, the first input end of the second on-frequency combiner is electrically connected to the output end of the fifth low-noise amplifier, the second input end of the second on-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.

[0030] As can be seen from the above description, 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 into the DAC (DAC is a digital-to-analog converter, also known as D / A converter) to convert the digital signal into an analog signal, which is then up-converted to an RF signal.

[0031] 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.

[0032] As can be seen from the above description, the second digital signal processing unit converts the received optical signal into a digital signal, sends it to the FPGA for software digital processing (low noise suppression, carrier tracking, etc.), and inputs it into the DAC (DAC is a digital-to-analog converter, also known as D / A converter) to convert the digital signal into an analog signal, which is then up-converted to an RF signal. The filter can allow specific frequency components in the signal to pass through and can greatly attenuate and suppress other frequency components.

[0033] Furthermore, 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;

[0034] 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 on-frequency combiner, respectively. The second output end of the third on-frequency combiner is grounded through a resistor. The first input end of the third on-frequency combiner is electrically connected to the output end of the first low-noise amplifier, and the second input end of the third on-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.

[0035] 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 small RF signals, thereby improving the output signal-to-noise ratio so that the system can obtain a smaller noise figure; the third digital frequency selection unit down-converts the RF signal to the ADC to convert the RF signal into a digital signal, and then sends it to the FPGA for software digital processing (frequency selection, band selection, etc.), and outputs it to the universal public radio interface for modulation and optical fiber transmission to the remote end.

[0036] Furthermore, 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;

[0037] 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 on-frequency combiner respectively, the second input end of the third on-frequency combiner is grounded through a resistor, the first output end of the third on-frequency combiner is electrically connected to the input end of the second power amplifier, the second output end of the third on-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.

[0038] As can be seen from the above description, the third digital signal processing unit converts the received optical signal into a digital signal, sends it to the FPGA for software digital processing (such as noise suppression and carrier tracking), and then inputs it into the DAC (DAC is a digital-to-analog converter, also known as D / A converter) to convert the digital signal into an analog signal, which is then up-converted to an RF signal.

[0039] Furthermore, the second power amplifier and the third power amplifier are both digital pre-distortion power amplifiers.

[0040] Furthermore, one radio frequency digital access device is connected to sixteen radio remote devices in a chain manner.

[0041] Furthermore, one radio frequency digital access device is connected to four radio remote devices in a star configuration.

[0042] Please refer to Figure 1 and Figure 2 As shown, the first embodiment of the present utility model is:

[0043] A multi-system digital optical fiber radio remote device includes a first universal public radio interface 1 (model N / SMA-KKF in this embodiment), a second universal public radio interface 2 (model N / SMA-KKF in this embodiment), a radio frequency digital access device 3 (also called "access device," which in this embodiment uses a commercially available device), and at least one radio remote device 4 (also called "remote device," which in this embodiment uses a commercially available device).

[0044] Please refer to Figure 1 The radio frequency digital access device 3 includes a first signal source radio frequency signal transceiver module 31, a second signal source radio frequency signal transceiver module 32, and a third signal source radio frequency signal transceiver module 33. The first signal source radio frequency signal transceiver module 31, the second signal source radio frequency signal transceiver module 32, and the third signal source radio frequency signal transceiver module 33 have different operating frequency bands. 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.

[0045] The first signal source RF signal transceiver module 31, the second signal source RF signal transceiver module 32 and the third signal 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 an optical fiber.

[0046] Please refer to Figure 1 The first signal 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 broadcast 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.

[0047] Please refer to Figure 1The second signal source RF signal transceiver module 32 includes a first on-frequency combiner 321 (model PD0900U03-070 used in this embodiment), a fourth low-noise amplifier 322 (model PNH16 used in this embodiment), and a second digital frequency selection unit 323 (chip model XC7K100T used in this embodiment). The first input end of the first on-frequency combiner 321 receives a downlink 360 MHz RF signal through the base station antenna, and the second input end of the first on-frequency combiner 321 receives a downlink 420 MHz RF signal through the base station antenna. The first output end of the first on-frequency combiner 321 is electrically connected to the input end of the fourth low-noise amplifier 322. The second output end of the first on-frequency combiner 321 is grounded via a resistor. The output end of the fourth low-noise amplifier 322 is electrically connected to the third signal conversion module 43 via the second digital frequency selection unit 323.

[0048] Please refer to Figure 1 The third signal source RF signal transceiver module 33 includes a second on-frequency combiner 331 (model PD0900U03-070 used in this embodiment), a fifth low-noise amplifier 332 (model PNH16 used in this embodiment), and a first digital signal processing unit 333 (model XC7K100T chip used in this embodiment). The first input end of the second on-frequency combiner 331 is electrically connected to the output end of the fifth low-noise amplifier 332, and the second input end of the second on-frequency combiner 331 is grounded via a resistor. The input end of the fifth low-noise amplifier 332 is electrically connected to the second signal conversion module 42 via the first digital signal processing unit 333.

[0049] Please refer to Figure 2 The first signal conversion module 41 includes a second digital signal processing unit 411 (a chip model XC7K100T is used in this embodiment), a first power amplifier 412 (a chip 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.

[0050] Please refer to Figure 2The second signal conversion module 42 includes a third digital frequency selection unit 421 (in this embodiment, a chip model XC7K100T is used), a third same-frequency combiner 422 (in this embodiment, a chip model PD0900U03-070 is used), a first low-noise amplifier 423 (in this embodiment, a chip model PL08 is used), a second low-noise amplifier 424 (in this embodiment, a chip model PL08 is used), a first duplexer 425 (in this embodiment, a device currently available on the market is used), a second duplexer 426 (in this embodiment, a device currently available on the market is used), a second retransmission antenna 427 (in this embodiment, a device currently available on the market is used), and a third retransmission antenna 428 (in this embodiment, a device currently available on the market is used).

[0051] 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, and 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. 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.

[0052] 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 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).

[0053] 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 on-frequency combiner 422 respectively, the second input end of the third on-frequency combiner 422 is grounded through a resistor, the first output end of the third on-frequency combiner 422 is electrically connected to the input end of the second power amplifier 433, the second output end of the third on-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.

[0054] The second power amplifier 433 and the third power amplifier 434 are both digital pre-distortion power amplifiers.

[0055] Common Public Radio Interface (CPRI) is a digital protocol for serial high-speed data transmission between two parts of a modern base station. This digital protocol enables a physical connection between access equipment and remote equipment via fiber optic cables. The CPRI protocol transmits processed digital RF and other signals bidirectionally to both the near and far ends via optical fiber.

[0056] The RF digital access device 3 and the RF remote device 4 support a point-to-multipoint star-type network. One RF digital access device 3 can connect four RF remote devices 4 in a star-type network. Each RF digital access device 3 supports a chain-type connection of at least sixteen RF remote devices 4. Fiber optic transmission is used between the RF digital access device 3 and the RF remote device 4, and the maximum remote distance can reach 20 km.

[0057] 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, which is then sent to the FPGA for software digital processing (noise suppression, carrier tracking, etc.), and then input into the DAC (DAC is a digital-to-analog converter, also known as D / A converter) to convert the digital signal into an analog signal, and then up-converted to a radio frequency signal.

[0058] 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.

[0059] 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, modulate it to the optical fiber and transmit it to the remote end.

[0060] The first low noise amplifier 423 and the second low noise amplifier 424 can perform low noise multi-stage amplification on the radio frequency small signal, thereby improving the output signal-to-noise ratio, so that the system can obtain a smaller noise figure.

[0061] The first duplexer 425 and the second duplexer 426 separate / combine the uplink and downlink signals, and filter out out-band signals or spurious signals, and perform high-suppression bandpass filtering on the uplink and downlink; they are designed in a cross-coupling manner, which introduces radiation coupling between non-adjacent cavities to generate a transmission zero point near the passband, making the passband to attenuation filtering steeper, and having the characteristics of high out-of-band suppression, low adjacent channel leakage and small size.

[0062] The working principle of the multi-system digital optical fiber radio remote equipment designed in this solution is:

[0063] FM broadcast signal link: FM broadcast signals are received from outside the tunnel via a base station antenna, enter the third low-noise amplifier 311 of the RF digital access device 3 for small signal amplification, and then pass to the first digital frequency selection unit 312 for down-conversion, analog-to-digital conversion (performed by an ADC, which is an analog-to-digital converter, also known as an A / D converter), and digital processing (performed by an FPGA). Frequency selection is also performed simultaneously. The digital signal reaches the first universal public radio interface 1, is transmitted via optical fiber to the radio remote device 4, and then passes through the second universal public radio interface 2 to the second digital signal processing unit 411 for further processing. Digital-to-analog conversion (performed by a DAC, which is a digital-to-analog converter, also known as a D / A converter) is performed to convert the digital quantity into an analog signal. The signal is amplified to a certain power value by the first power amplifier 412, input into the filter 413 to suppress out-of-band spurious signals, and then transmitted by the FM retransmission antenna (i.e., the first retransmission antenna 414).

[0064] 350MHz (downlink: 360MHz; uplink: 350MHz) Public Security Fire Protection, 400MHz (downlink: 420MHz; uplink: 410MHz) private network intercom link:

[0065] Downlink: The downlink 360MHz (downlink: 420MHz) RF signal coupled by the base station antenna end 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 sent to the second digital frequency selection unit 323 for down-conversion, analog-to-digital conversion (performed by ADC, ADC is an analog-to-digital converter, also known as A / D converter) and digital processing (performed by FPGA), and frequency selection processing is performed at the same time. The digital signal is sent to the first universal public radio interface 1 and transmitted to the radio remote device 4 via optical fiber, and then 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 a DAC, which is a digital-to-analog converter, also known as a D / A converter). The digital quantity is converted into an analog signal, which is then split 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. The signal is then input into the second duplexer 426 and the first duplexer 425 to suppress out-of-band spurious signals, and is then transmitted by the 360 MHz retransmission antenna (i.e., the third retransmission antenna 428) and the 420 MHz retransmission antenna (i.e., the second retransmission antenna 427).

[0066] 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 within the working band, and then enter the first low-noise amplifier 423 and the second low-noise amplifier 424 for low-noise amplification. Thereafter, they are combined by the third co-frequency combiner 422 and enter the third digital frequency selection unit 421 for down-conversion and analog-to-digital conversion (performed by 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 via optical fiber, and then to the first digital signal processing unit 333 via the first universal public radio interface 1 for digital processing (performed by FPGA) and digital-to-analog conversion (performed by DAC, DAC is a digital-to-analog converter, also known as D / A converter). The digital quantity is converted into an analog signal, output to the fifth low-noise amplifier 332, and then divided into two 350MHz and 410MHz channels by the second co-frequency combiner 331, output to the base station antenna end for coupling and reception by the base station.

[0067] In summary, the utility model provides a multi-system digital optical fiber radio frequency remote device, which is provided by setting a radio frequency digital access device and a radio frequency remote device. 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. 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 operating frequency bands. The radio frequency remote device includes a first signal conversion module, a second signal conversion module and a third signal conversion module. The radio frequency digital access device can convert the downlink radio frequency signals of the three different frequency band signal sources through wired coupling. The data enters the digital fiber optic RF access equipment system, is converted into a digital signal, and then converted into an optical signal through optoelectronics and 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 via 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 digital fiber optic remote mode to achieve multi-band (FM emergency broadcast, 350M public security and fire protection, 400M internal dispatch) coverage of digital private network communications.

[0068] 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 multi-system digital optical fiber radio remote device, characterized in that: Including radio frequency digital access device and radio frequency remote device; 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, wherein 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 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 signal source RF signal transceiver module is electrically connected to the first signal conversion module, the second signal source RF signal transceiver module is electrically connected to the third signal conversion module, and the third signal source RF signal transceiver module is electrically connected to the second signal conversion module.

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 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.

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 on-frequency combiner, a fourth low-noise amplifier and a second digital frequency selection unit. The first input end of the first on-frequency combiner receives a downlink 360MHz RF signal through the base station antenna, and the second input end of the first on-frequency combiner receives a downlink 420MHz RF signal through the base station antenna. The first output end of the first on-frequency combiner is electrically connected to the input end of the fourth low-noise amplifier, the second output end of the first on-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 on-frequency combiner, a fifth low-noise amplifier and a first digital signal processing unit. The first input end of the second on-frequency combiner is electrically connected to the output end of the fifth low-noise amplifier, the second input end of the second on-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.

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 on-frequency combiner, respectively. The second output end of the third on-frequency combiner is grounded through a resistor. The first input end of the third on-frequency combiner is electrically connected to the output end of the first low-noise amplifier, and the second input end of the third on-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 on-frequency combiner respectively, the second input end of the third on-frequency combiner is grounded through a resistor, the first output end of the third on-frequency combiner is electrically connected to the input end of the second power amplifier, the second output end of the third on-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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