CN108847891B - Radio over fiber distributed small base station system - Google Patents
Radio over fiber distributed small base station system Download PDFInfo
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- CN108847891B CN108847891B CN201810539751.9A CN201810539751A CN108847891B CN 108847891 B CN108847891 B CN 108847891B CN 201810539751 A CN201810539751 A CN 201810539751A CN 108847891 B CN108847891 B CN 108847891B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention provides an optical carrier radio distributed small base station system, which comprises a small base station unit and an ROF remote unit, wherein the small base station unit is connected with the ROF remote unit by adopting optical fibers; the small base station unit is used for completing modulation and demodulation of service data, interconversion between a modulation signal and a radio frequency signal and interconversion from the radio frequency signal to analog light; and the ROF remote unit is used for finishing the interconversion from analog light to radio frequency signals, and the power amplification and the receiving-transmitting duplex of the radio frequency signals. Compared with an integrated pico-base station system, the system can realize remote coverage, greatly improves the coverage area of a small base station, reduces the coverage cost of unit area, and is easier to realize fine coverage. The invention can be widely applied to mobile signal coverage application scenes with more partitions such as residential districts, hotels, tea buildings, entertainment places and the like, and the equipment cost and the installation and maintenance cost covered in unit area are greatly reduced compared with those of an integrated pico-cell station.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to an optical carrier radio distributed small base station system.
Background
With the market of mobile communication in China entering the 5G (fifth generation mobile communication) era, the traditional distributed coverage system adopts a radio frequency feeder and a large number of power dividers to complete signal coverage, and the transmission loss of the devices to high-frequency signals of 2.6GHz and above is very large, so that the problems of large electromagnetic radiation, large user terminal transmitting power, large construction coordination difficulty and the like when the radio frequency signals with large signal source lead power and high power are transmitted in the distributed system are prominent, and the distributed coverage system is not suitable for the future 5G system. In addition, the existing integrated pico-base station has a small power and a small coverage radius of only a few meters, so that the signal coverage problem of multi-partition scenes such as hotels and entertainment places is difficult to solve.
Disclosure of Invention
Aiming at the problem of indoor coverage of the current wireless signals, the invention provides an optical carrier radio distributed small base station system which adopts a digital signal transmission mode to effectively reduce the transmission loss difference among different frequency signals and reduce the transmission loss of radio frequency signals; distributed coverage is adopted, and the coverage range of a single station extends to the coverage range of the whole system.
The technical scheme of the invention provides a distributed small base station system of Radio Over Fiber (ROF), which is used for a multi-partition scene of a 5G communication system and comprises a small base station unit and an ROF remote unit, wherein the small base station unit is connected with the ROF remote unit by adopting optical fibers, analog modulation radio frequency signals are carried on the optical fibers, the ROF represents Radio Over Fiber (ROF),
the small base station unit is used for completing modulation and demodulation of service data, interconversion between a modulation signal and a radio frequency signal and interconversion from the radio frequency signal to analog light;
and the ROF remote unit is used for finishing the interconversion from analog light to radio frequency signals, and the power amplification and the receiving-transmitting duplex of the radio frequency signals.
Furthermore, the small cell includes a service interface and baseband processing unit 101, a radio frequency front end unit 102, an analog laser 103, and a monitoring unit 104, where the service interface and baseband processing unit 101 is connected to the radio frequency front end unit 102, the radio frequency front end unit 102 is connected to the analog laser 103, and the monitoring unit 104 is connected to the service interface and baseband processing unit 101 and the radio frequency front end unit 102.
Moreover, the small cell unit operates as follows,
in the downlink direction, the service interface and baseband processing unit 101 accesses service data, and sends the service data to the radio frequency front end unit 102 after baseband modulation and demodulation processing, and the radio frequency front end unit 102 converts signals into analog signals through digital-to-analog conversion, and sends the analog signals to each laser 103 after up-conversion and shunt amplification; meanwhile, the monitoring unit 104 sends remote monitoring information to the ROF remote unit, and the remote monitoring information is sent to the laser 103 through the radio frequency front end unit 102 and sent out;
in the uplink direction, the laser 103 receives uplink data from each ROF remote unit, and recovers the data to a digital signal through the radio frequency front end unit 102 to the service interface and baseband processing unit 103, and after demodulation, decoding and frame decoding, separates out monitoring return information to the monitoring unit 104, and restores main data to service data return through the service interface.
Furthermore, the ROF remote unit includes an analog laser 201, a combining and splitting unit 202, a power amplifier 203, a duplexer 204, a low noise amplifier 205, a gain control unit 206, and a monitoring unit 207, wherein the analog laser 201 is connected to the combining and splitting unit 202, the combining and splitting unit 202 is connected to the duplexer 204 via the power amplifier 203, and the duplexer 204 is connected to the combining and splitting unit 202 via the low noise amplifier 205 and the gain control unit 206.
Furthermore, the operation of the ROF remote unit is as follows,
in the downlink direction, the laser 201 recovers the downlink signal into a radio frequency carrier, and the combining and splitting unit 202 filters and separates out a service carrier and a monitoring carrier, wherein the monitoring carrier is distributed to the monitoring unit 207 for analysis, the service carrier passes through the power amplifier 203, the power amplifier 203 raises the signal level of the service carrier, and the output power level of the service carrier is adjusted by the monitoring unit 207, so as to realize different coverage requirements; the amplified downlink signal passes through the duplexer 204 and is transmitted by an external or internal antenna;
in the uplink direction, the antenna receives uplink signals sent by each terminal, the uplink signals are amplified by the duplexer 204 to the low noise amplifier 205, the gain control unit 206 realizes gain control of the uplink signals, the combining and splitting unit 202 combines the uplink main signals with the monitoring return signals sent by the monitoring unit 207, and the mixed carrier is directly modulated into optical signals by the laser 201 and is transmitted back to the small base station unit through the optical fiber.
And the small base station unit is connected with a plurality of ROF remote units to form a star network.
And the ROF remote unit is connected with other ROF remote units through the extended analog optical interface to form a chain network.
Compared with the traditional indoor distribution system, the radio-over-fiber distributed small base station system has the following advantages that:
1. compared with a passive room subsystem: the passive equipment does not get electricity, cannot control power, and is debugged by reinforcing the fixed attenuator by a link; the passive room is divided into high-frequency application links, so that the attenuation is large, and the passive room cannot be applied to a 4.9GHz 5G system; the system of the invention has no power loss and electromagnetic radiation problems introduced by feeder line transmission. Each ROF remote unit of the system can independently control the transmitting power by a monitoring unit, and the covering power can be remotely controlled through a central machine room, so that the refined covering of each floor and each area is realized. And by adopting optical fiber transmission, a transmission link is not influenced by frequency, and the transmission loss is very small.
2. Compared with the traditional integrated small base station: the traditional small base station can only realize short-distance coverage near the installation position of the base station; the small base station unit and the ROF remote unit of the system adopt optical transmission remote and remote distributed coverage, the coverage range is extended, the ROF remote unit does not contain digital signal processing and digital-to-analog conversion, only has a radio frequency front end, and the remote end is small in size.
3. The system adopts a distributed architecture, can provide access capacity and expand extended coverage; compared with the traditional digital remote base station, the main digital signal processing and returning parts of the system are all arranged in a central machine room, the remote ends do not contain digital signal processing, and the distributed low-power remote ends can uniformly cover signals; the remote units can extend to different partition spaces, and each remote covering power can be optimized independently; the volume of the high-power covered far-end is generally more than 20L, and the volume of the far-end of the system is only within 2L, so that the system is convenient for indoor arrangement and camouflage.
The system can be widely applied to mobile signal coverage application scenes of districts, hotels, entertainment places and the like, the cost of unit area coverage equipment and the cost of installation and maintenance are reduced by more than 30 percent compared with those of high-power remote ends and integrated base stations, the system has great market value, is a key development direction in the future communication field, and is an important basic technology for ensuring the leading level of China in the international 5G industry.
Drawings
Fig. 1 is an overall schematic diagram of an embodiment of the present invention.
Fig. 2 is a block diagram of a small cell site unit according to an embodiment of the present invention.
Fig. 3 is a block diagram of a remote unit of an ROF according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further specifically described below by combining the examples with the embodiments.
The invention provides a Radio Over Fiber (ROF) distributed small base station system aiming at a multi-partition scene of a 5G communication system, which comprises a small base station unit and an ROF remote unit, wherein the small base station unit is connected with the ROF remote unit by adopting optical fibers, and modulated radio frequency signals are carried on the optical fibers in a photon mode.
The radio over fiber distributed small base station system of the embodiment of the invention consists of two parts: a small base unit and a ROF remote unit. The small base station unit completes the modulation and demodulation from the service data to the digital modulation signal, the interconversion between the digital modulation signal and the radio frequency signal, and the interconversion from the radio frequency signal to the light. The remote ROF unit completes the interconversion from light to radio frequency signals, the power amplification and the receiving and transmitting duplexing of the radio frequency signals.
The small base station unit can be connected with a plurality of ROF remote units, the ROF remote units can also expand the optical interface to cascade other ROF remote units, networking of various forms such as star type, chain type and the like is realized, and the coverage range can also be expanded through an optical network.
As shown in fig. 1, a typical radio over fiber distributed small cell system is composed of a small cell unit 100 and a ROF remote unit 200. The small base station unit can also be connected with a plurality of ROF remote units in an expanding way to form a star topology network.
The invention provides that the small base station unit and each ROF remote unit are connected by adopting optical fibers, radio frequency signals are transmitted on the small base station unit, and service data of radio frequency carriers and monitoring information of carriers specifically modulated by control signals (such as frequency shift keying FSK modulation) are carried. The ROF remote unit can recover the radio frequency signal only by carrying out photoelectric conversion without carrying out digital processing and frequency spectrum shifting, thereby reducing the complexity of the unit. In the whole system, the ROF unit only has a radio frequency processing function, the function is simple, the cost is low, and the consumption of the ROF remote unit is maximum, so that the investment cost and the maintenance cost of the whole system can be reduced. In addition, the modulation bandwidth of the optical transceiver is very wide, and covers the frequency bands of all current mobile communication systems, so that the system can easily realize wireless signal transmission of various systems, and can insert self-defined carriers such as monitoring and auxiliary services in unoccupied frequency bands, and only needs to perform filtering separation at a receiving end.
The downlink of the system refers to the processing of signals from the small base unit to the ROF remote unit, and the uplink refers to the processing of signals from the ROF remote unit to the small base unit.
The downlink of the system is illustrated as follows:
the small base station unit accesses service data, carries out analysis, framing, coding, modulation and digital-to-analog conversion, then carries out up-conversion to obtain radio frequency signals, and the radio frequency signals are converted into optical signals by a direct modulation optical transceiver and are pulled to a corresponding ROF remote unit through optical fibers. The ROF remote unit recovers radio frequency signals through photoelectric conversion, and the radio frequency signals are transmitted out through an internal or external antenna after power amplification.
The uplink is illustrated as follows:
the ROF remote unit receives the uplink signal from the terminal, after power amplification and gain control, the uplink signal is directly converted into an optical signal by the direct modulation laser and transmitted to the connected small base station unit. The small base station unit receives signals uploaded by each route of ROF remote units, and restores the signals into service data after completing photoelectric conversion, signal combination, down-conversion, analog-to-digital conversion and digital demodulation in sequence, and the service data is returned through the interface unit.
The units in the examples are specifically described as follows:
1. small base station unit
As shown in fig. 2, the small cell unit of the system is composed of a service interface and baseband processing unit 101, a radio frequency front end unit 102, a laser 103, a monitoring unit 104, and a power supply unit 105. The service interface and baseband processing unit 101 is connected to the rf front end unit 102, the rf front end unit 102 is connected to the laser 103, and the monitoring unit 104 is connected to the service interface and baseband processing unit 101 and the rf front end unit 102.
The link connection relationship is as follows:
the service interface and baseband processing unit 101, the radio frequency front end unit 102 and the laser 103 are connected in sequence to form a downlink; the laser 103, the rf front-end unit 102, the service interface and baseband processing unit 101 are connected in sequence to form an uplink. In specific implementation, the uplink and the downlink can adopt the same link and different optical wavelengths. Further, a plurality of lasers 103 may be provided, providing a plurality of links to enable networking. Each laser 103 is connected to the rf front-end unit 102.
The monitoring unit 104 monitors each module unit and a plurality of remote ROF units. The power supply unit 105 supplies energy to each active module unit, and the power supply unit is connected with the active module units according to the chips adopted by the active module units in specific implementation.
The working principle is as follows:
in the downlink direction, the service interface and baseband processing unit 101 accesses service data, and sends the service data to the radio frequency front end unit 102 after baseband modulation and demodulation processing, and the radio frequency front end unit 102 converts signals into analog signals through digital-to-analog conversion, and sends the analog signals to each laser 103 after up-conversion and shunt amplification. Meanwhile, the monitoring unit 104 sends remote monitoring information to the ROF remote unit, and the remote monitoring information is also sent to the laser 103 through the rf front-end unit 102.
In the uplink direction, the laser 103 receives uplink data from each ROF remote unit, and recovers the data to a digital signal through the radio frequency front end unit 102 to the service interface and baseband processing unit 103, and after demodulation, decoding and frame decoding, the monitoring return information is separated and sent to the monitoring unit 104, and the main data is restored to service data through the service interface and returned.
The power supply unit 105 performs input power conversion to provide the required operating voltage for each active module unit.
ROF remote unit
As shown in fig. 3, the ROF remote unit of the system includes a laser 201, a combining and splitting unit 202, a power amplifier 203, a duplexer 204, a low noise amplifier 205, a gain control unit 206, a monitoring unit 207, and a power supply unit 208. The laser 201 is connected to the combining and splitting unit 202, the combining and splitting unit 202 is connected to the duplexer 204 via the power amplifier 203, the duplexer 204 is connected to the combining and splitting unit 202 via the low noise amplifier 205 and the gain control unit 206, and the monitoring unit 207 is connected to the combining and splitting unit 202.
The link connection relationship is as follows:
the laser 201, the combining and splitting unit 202, the power amplifier 203 and the duplexer 204 are sequentially connected to form a downlink; the duplexer 204, the low noise amplifier 205, the gain control unit 206, the combining and splitting unit 202, and the laser 201 are connected in sequence to form an uplink.
The monitoring unit 207 monitors each module unit in the ROF remote unit, and may be implemented by a microprocessor. The power supply unit 208 supplies energy to each active module unit, and the power supply unit is connected to the active module unit according to the chip adopted by each unit.
The working principle is as follows:
in the downlink direction, the laser 201 recovers the downlink signal into a radio frequency carrier, and the combining and splitting unit 202 filters and separates out a service carrier and a monitoring carrier. The monitor carriers are distributed to the monitor unit 207 for analysis, and the service carriers pass through the power amplifier 203. The power amplifier 203 boosts the signal level of the traffic carrier, and its output power level can be adjusted by the monitoring unit 207 to achieve different coverage requirements. The amplified downlink signal passes through the duplexer 204 and is transmitted by an external or internal antenna.
In the uplink direction, the antenna receives an uplink signal from each terminal, and the uplink signal is amplified by the duplexer 204 to the low noise amplifier 205. The gain control unit 206 implements automatic gain control of the uplink signal to avoid level differences caused by different distances between the user terminals, and to ensure that the power of the carrier entering the laser is constant. The combining and splitting unit 202 combines the uplink main signal with the monitoring return signal sent from the monitoring unit 207, and the mixed carrier is directly modulated into an optical signal by the laser 201 and is returned to the small base station unit through the optical fiber. In a specific implementation, the monitoring unit 207 may communicate with the near-end monitor, control the far-end power and the rf gain, and obtain the monitor backhaul signal.
The power supply unit 208 performs input power conversion to provide required operating voltage for each active module unit.
It should be emphasized that the described embodiments of the present invention are illustrative and not restrictive. Therefore, the present invention includes, but is not limited to, the examples described in the detailed description, and all other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art also belong to the protection scope of the present invention.
Claims (5)
1. An over-the-light radio distributed small cell system, characterized in that: the multi-partition scene for the 5G communication system is composed of a small base station unit and an ROF remote end unit, wherein the small base station unit is connected with the ROF remote end unit by adopting optical fibers, analog modulation radio frequency signals are carried on the optical fibers, the ROF represents radio over fiber,
the small base station unit is used for completing modulation and demodulation of service data, interconversion between a modulation signal and a radio frequency signal and interconversion from the radio frequency signal to analog light;
the ROF remote unit is used for completing the interconversion from analog light to radio frequency signals and the power amplification and transceiving duplexing of the radio frequency signals, an analog laser (201) is arranged in the ROF remote unit, and the ROF remote unit transmits analog modulation radio frequency signals with the small base station unit through optical fibers without digital signal processing and digital-to-analog conversion.
2. The radio over fiber distributed small cell base station system of claim 1, wherein: the small base station unit comprises a service interface and baseband processing unit (101), a radio frequency front end unit (102), an analog laser (103) and a monitoring unit (104), wherein the service interface and baseband processing unit (101) is connected with the radio frequency front end unit (102), the radio frequency front end unit (102) is connected with the analog laser (103), and the monitoring unit (104) is connected with the service interface and baseband processing unit (101) and the radio frequency front end unit (102).
3. The radio over fiber distributed small cell base station system of claim 2, wherein: the small cell base unit operates as follows,
in the downlink direction, a service interface and baseband processing unit (101) accesses service data, the service data is sent to a radio frequency front end unit (102) after baseband modulation and demodulation processing, the radio frequency front end unit (102) converts signals into analog signals through digital-to-analog conversion, and the analog signals are sent to each laser (103) after up-conversion and shunt amplification; meanwhile, the monitoring unit (104) sends remote monitoring information to the ROF remote unit, and the remote monitoring information is sent to the laser (103) through the radio frequency front end unit (102) and sent out;
in the uplink direction, the laser (103) receives uplink data from each ROF remote unit, the uplink data is recovered to a digital signal through the radio frequency front end unit (102) and is sent to the service interface and baseband processing unit (103), after demodulation, decoding and frame decoding are carried out, monitoring return information is separated and sent to the monitoring unit (104), and main data is restored to service data through the service interface and is returned.
4. The radio over fiber distributed small cell base station system of claim 1, wherein: the ROF remote unit comprises an analog laser (201), a combining and splitting unit (202), a power amplifier (203), a duplexer (204), a low noise amplifier (205), a gain control unit (206) and a monitoring unit (207), wherein the analog laser (201) is connected with the combining and splitting unit (202), the combining and splitting unit (202) is connected with the duplexer (204) through the power amplifier (203), and the duplexer (204) is connected with the combining and splitting unit (202) through the low noise amplifier (205) and the gain control unit (206).
5. The radio over fiber distributed small cell base station system of claim 4, wherein: the operation of the ROF remote unit is as follows,
in the downlink direction, the analog laser (201) restores downlink signals into radio frequency carriers, and a combining and splitting unit (202) filters and separates out service carriers and monitoring carriers, wherein the monitoring carriers are distributed to a monitoring unit (207) for analysis, the service carriers pass through a power amplifier (203), the power amplifier (203) improves the signal level of the service carriers, and the output power level of the service carriers is adjusted by the monitoring unit (207) to realize different coverage requirements; the amplified downlink signal is transmitted by an external or internal antenna through a duplexer (204);
in the uplink direction, an antenna receives uplink signals sent by each terminal, the uplink signals are amplified to a low noise amplifier (205) through a duplexer (204), a gain control unit (206) realizes gain control of the uplink signals, a combining and splitting unit (202) combines uplink main signals and monitoring return signals sent by a monitoring unit (207), and mixed carriers are directly modulated into optical signals by an analog laser (201) and are transmitted back to a small base station unit through optical fibers.
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| CN109687899B (en) * | 2019-01-16 | 2021-10-22 | 武汉虹信科技发展有限责任公司 | Method for transmitting satellite synchronous signal on extended type pico-base station |
| CN110166132A (en) * | 2019-05-15 | 2019-08-23 | 西南交通大学 | A kind of multiple spot virtual reality cut-in method based on light carrier radio communication |
| CN110620590A (en) * | 2019-08-14 | 2019-12-27 | 熊猫电子集团有限公司 | Serialized short-wave communication platform |
| CN111884723B (en) * | 2020-07-24 | 2024-05-28 | 中国电子科技集团公司第三十四研究所 | Photoelectric radio frequency feeder line assembly applied to uplink communication link |
| CN111884724B (en) * | 2020-07-24 | 2024-05-28 | 中国电子科技集团公司第三十四研究所 | Photoelectric radio frequency feeder line assembly applied to downlink communication link |
| CN113747451B (en) * | 2021-09-03 | 2024-01-30 | 瑞斯康达科技发展股份有限公司 | Base station host, base station system and communication method |
| CN114302415A (en) * | 2021-12-29 | 2022-04-08 | 盐城浩方信息技术有限公司 | Expansion unit of expansion type pico-base station based on 5G VoNR network |
| CN114172579A (en) * | 2021-12-31 | 2022-03-11 | 京信网络系统股份有限公司 | Base station and communication system |
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Address after: 430205 Hubei city of Wuhan province Jiangxia Hidden Dragon Island Tan lake two Road No. 1 Patentee after: CITIC Mobile Communication Technology Co., Ltd Address before: 430073 Hubei province Wuhan Dongxin East Lake high tech Development Zone, Road No. 5 Patentee before: Wuhan Hongxin Telecommunication Technologies Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 430205 No.1 tanhu 2nd Road, Canglong Island, Jiangxia District, Wuhan City, Hubei Province Patentee after: CITIC Mobile Communication Technology Co.,Ltd. Address before: 430205 No.1 tanhu 2nd Road, Canglong Island, Jiangxia District, Wuhan City, Hubei Province Patentee before: CITIC Mobile Communication Technology Co., Ltd |