CN106712851B - Distributed wireless signal coverage system - Google Patents
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Abstract
The invention provides a distributed wireless signal coverage system which comprises a baseband signal processing unit, a radio frequency extension unit and a radio frequency far-end unit, wherein digital optical transmission is adopted between the baseband signal processing unit and the radio frequency extension unit, and analog radio-over-fiber radio transmission is directly adopted between the radio frequency extension unit and the radio frequency far-end unit. Compared with the traditional distributed coverage system, the system has the advantages of small radio frequency remote unit volume, low cost, low power consumption, easy arrangement and easy realization of fine coverage. The system can be widely applied to mobile signal coverage application scenes of various large buildings, airports, stations and the like, and the total equipment cost and the installation and maintenance cost are greatly reduced.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a distributed wireless signal coverage system.
Background
With the market of the mobile communication in china entering the 4G (fourth generation mobile communication) era, the traditional distributed coverage system has great difference in transmission loss of signals with different frequencies, and thus it is difficult to meet the requirement of a unified platform for simultaneous access of multiple wireless communication networks. The transmission loss is large, so that the problems of large electromagnetic radiation, large user terminal transmitting power, large investment control and implementation coordination difficulty and the like when a signal source is connected with a high-power radio-frequency signal in a distribution system are prominent.
Disclosure of Invention
Aiming at the problem of indoor coverage of the current wireless signals, the invention provides a distributed wireless signal coverage system.
The technical scheme of the invention provides a distributed wireless signal coverage system, which comprises a baseband signal processing unit, a radio frequency extension unit and a radio frequency far-end unit, wherein digital optical transmission is adopted between the baseband signal processing unit and the radio frequency extension unit, and the radio frequency extension unit and the radio frequency far-end unit directly adopt analog radio over fiber transmission;
the baseband signal processing unit is used for completing the modulation and demodulation from the service data to the digital modulation signal;
the radio frequency expansion unit is used for finishing the interconversion between the digital modulation signal and the radio frequency signal and the interconversion from the radio frequency signal to the analog light;
and the radio frequency far-end 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.
Moreover, the baseband signal processing unit includes a service interface unit 101, a baseband processing unit 102, a digital laser 103, and a monitoring unit 104, where the service interface unit 101 is connected to the baseband processing unit 102, the baseband processing unit 102 is connected to the digital laser 103, and the monitoring unit 104 is connected to the baseband processing unit 102.
Moreover, the radio frequency expansion unit includes a digital laser 201, a digital processing unit 202, an analog-to-digital/digital-to-analog conversion unit 203, a frequency conversion unit 204, a combining and splitting unit 205, an analog laser 206 and a monitoring unit 207, the digital laser 201 is connected to the digital processing unit 202, the digital processing unit 202 is connected to the analog-to-digital/digital-to-analog conversion unit 203, the frequency conversion unit 204, the combining and splitting unit 205 and the analog laser 206 are sequentially connected, and the monitoring unit 207 is connected to the digital processing unit 202 and the combining and splitting unit 205.
The radio frequency remote unit includes an analog laser 301, a combining and splitting unit 302, a power amplifier 303, a duplexer 304, a low noise amplifier 305, a gain control unit 306, and a monitoring unit 307, wherein the analog laser 301 is connected to the combining and splitting unit 302, the combining and splitting unit 302 is connected to the duplexer 304 via the power amplifier 303, the duplexer 304 is connected to the combining and splitting unit 302 via the low noise amplifier 305 and the gain control unit 306, and the monitoring unit 307 is connected to the combining and splitting unit 302.
And the baseband signal processing unit is connected with the plurality of radio frequency extension units.
Furthermore, the radio frequency extension unit is connected with a plurality of radio frequency remote units.
And the radio frequency expansion unit is cascaded with other radio frequency expansion units through the expansion digital optical interface.
And the radio frequency remote unit is cascaded with other radio frequency remote units through the extended analog optical interface.
The distributed coverage system of the invention realizes the wireless signal indoor coverage based on the micro base station, and compared with the traditional indoor distribution system, the distributed coverage system has the following advantages:
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 units of the system adopt optical fiber transmission, and the problems of power loss and electromagnetic radiation caused by feeder transmission are solved. Each radio frequency remote unit of the system can independently control the transmitting power, and the fine coverage of each floor and each area can be realized.
2. Compared to conventional light distribution systems: the traditional light distribution system adopts digital processing at the near end and the far end, and the far end has larger power consumption and volume, thus being not beneficial to installation; the digital processing part of the system is mainly concentrated on the baseband signal processing unit and is used as a radio frequency far-end unit with the largest use amount in the indoor distribution system to directly amplify power, high-cost hardware of the digital processing part is not needed, equipment cost and maintenance cost are saved, the size of the far-end unit is smaller, debugging is not needed, the system is more suitable for indoor distribution, and the property coordination difficulty is relieved. In addition, the radio frequency expansion unit and the radio frequency remote unit of the system adopt analog optical transmission, multi-system signal transmission can be easily realized, the system is not limited by the speed of digital optical transmission, and the expansion flexibility is better than that of the traditional light distribution system which adopts digital optical transmission.
Compared with the traditional distributed coverage system, the system has the advantages of small radio frequency remote unit volume, low cost, low power consumption, easy arrangement and easy realization of fine coverage. The system adopts a multi-level distributed architecture, can provide access capacity and expand extended coverage; the coverage power utilization efficiency is high; the coverage power of different floors can be optimized independently; the far end has small volume, and is convenient for indoor arrangement; the coverage power is more uniform, the scheme design is simple, the coverage power is compatible with the existing coverage system to the maximum extent, and the investment in the early stage is protected. The system can be widely applied to mobile signal coverage application scenes of various large buildings, airports, stations and the like, the total equipment cost and the installation and maintenance cost are greatly reduced, the market value is great, and the system is a key development direction in the future communication field.
Drawings
Fig. 1 is an overall schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic networking diagram according to an embodiment of the present invention.
Fig. 3 is a block diagram of a baseband signal processing unit according to an embodiment of the present invention.
Fig. 4 is a block diagram of a radio frequency expansion unit according to an embodiment of the present invention.
Fig. 5 is a block diagram of a radio remote unit 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 distributed wireless signal coverage system of the embodiment of the invention consists of three parts: a baseband signal processing unit BU, a radio frequency expansion unit REU and a radio frequency remote unit RU. The baseband signal processing unit BU completes the modulation and demodulation from the service data to the digital modulation signal. The radio frequency expansion unit REU performs interconversion between the digital modulation signal and the radio frequency signal, and interconversion from the radio frequency signal to analog light. The radio frequency remote unit RU completes the interconversion from analog light to radio frequency signals, and the power amplification and the transceiving duplexing of the radio frequency signals. Therefore, the base station in the prior art is divided into three parts to realize distributed implementation, and the baseband signal processing unit only executes baseband part processing and can be regarded as a micro base station.
The baseband signal processing unit can be connected with a plurality of radio frequency extension units, the radio frequency extension units can also be connected with a plurality of radio frequency remote units, the radio frequency extension units can also extend digital optical interfaces to cascade the radio frequency extension units, and the radio frequency remote units can also extend analog optical interfaces to cascade the radio frequency remote units, so that networking of various forms such as star type, chain type and the like is realized, and the coverage range is extended.
As shown in fig. 1, a typical distributed wireless signal coverage system is composed of a baseband signal processing unit 100, an rf extension unit 200, and an rf remote unit 300. The baseband signal processing unit may also be connected to a plurality of rf extension units and rf remote units in an extended manner, such as the rf extension unit 400 and the rf remote unit 500 in fig. 2, to form a star topology network.
The invention provides that a baseband signal processing unit and each subordinate radio frequency extension unit are connected by adopting optical fibers, digital optical signals are transmitted on the baseband signal processing unit, and digitized service data and monitoring information are borne.
The radio frequency extension unit is connected with each radio frequency remote unit under the radio frequency extension unit by adopting an optical fiber, analog optical signals are transmitted on the radio frequency extension unit, and service data in a radio frequency carrier form and monitoring information in a specific modulation (such as frequency shift keying FSK modulation) carrier form are carried.
The radio frequency remote unit can recover radio frequency signals only by carrying out photoelectric conversion without carrying out digital processing and spectrum shifting, thereby reducing the complexity of the unit. The usage of the radio frequency remote unit is maximum in the whole system, so that the investment cost and the maintenance cost of the whole system can be reduced. In addition, the modulation bandwidth of the analog optical transceiver is very wide, generally reaching 0-3 GHz, and covering 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. In contrast, when digital light is adopted to transmit signals of multiple systems, the limitation of sampling rate requires very high transmission rate, and the transmission of signals of all the systems at present requires as high as 10Gbps, which puts high requirements on digital lasers and directly increases the system cost and complexity. And the expansion flexibility of digital optical transmission is poor, if the system needs to be increased, the frame format needs to be adjusted, and each unit of the whole system needs to be upgraded.
The downlink of the system refers to the processing process of signals from the baseband signal processing unit to the radio frequency remote unit, and the uplink refers to the processing process of signals from the radio frequency remote unit to the baseband signal processing unit.
The downlink of the system is illustrated as follows:
the baseband signal processing unit accesses service data, and after analysis, framing, coding and modulation, the service data is sent to the radio frequency expansion unit by the digital optical fiber transceiver through an optical fiber. The digital optical fiber transceiver of the radio frequency expansion unit receives signals, after demodulation and processing, the signals are shunted by the power division unit, each path of signals are subjected to digital-to-analog conversion and then are subjected to up-conversion to form radio frequency signals, the radio frequency signals are converted into analog optical signals by the analog optical transceiver, and the analog optical signals are amplified to the corresponding radio frequency remote unit through optical fibers. And the radio frequency far-end unit performs photoelectric conversion to recover radio frequency signals, and the radio frequency signals are transmitted out through an internal or external antenna after power amplification.
The uplink is illustrated as follows:
the radio frequency remote unit receives an uplink signal sent by the terminal, and after power amplification and gain control, the uplink signal is directly converted into an analog optical signal by the analog laser and transmitted to the connected radio frequency expansion unit. The radio frequency expansion unit receives signals uploaded by each radio frequency remote unit, frames each obtained digital signal according to a certain format after completing photoelectric conversion, down conversion and analog-to-digital conversion in sequence, and uploads the frames to the baseband signal processing unit by the digital laser. The baseband signal processing unit receives and demodulates the digital optical signal, and then restores the digital optical signal into service data, and the service data is transmitted back through the interface unit.
The units in the examples are specifically described as follows:
1. baseband signal processing unit BU
The baseband signal processing unit of the system, as shown in fig. 3, is composed of a service interface unit 101, a baseband processing unit 102, a digital laser 103, a monitoring unit 104, and a power supply unit 105. The service interface unit 101 is connected to the baseband processing unit 102, the baseband processing unit 102 is connected to the digital laser 103, and the monitoring unit 104 is connected to the baseband processing unit 102.
The link connection relationship is as follows:
the service interface unit 101, the baseband processing unit 102 and the digital laser 103 are connected in sequence to form a downlink; the digital laser 103, the baseband processing unit 102, and the service interface 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 digital lasers 103 may be provided, providing a plurality of links to enable networking. Each digital laser 103 is connected to the baseband processing unit 102.
The monitoring unit 104 monitors each module unit and subordinate REU and RU. 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 unit 101 accesses service data, analyzes and digitizes the service data, and transmits the service data to the baseband processing unit 102. Meanwhile, the monitoring unit 104 sends remote monitoring information to the rf extension unit and the rf remote unit, and also sends the remote monitoring information to the baseband processing unit 102. The baseband processing unit 102 performs framing, encoding, digital modulation, and other processing on the service and monitored combined signal, and then sends the signal to each radio frequency expansion unit REU by the digital laser 103.
In the uplink direction, the digital laser 103 receives uplink data from each radio frequency expansion unit REU, recovers the digital signal to the baseband processing unit 103, demodulates, decodes, and unframes the signal, separates out monitoring return information to the monitoring unit 104, and restores the main data to service data through the service interface unit 101 for return.
The power supply unit 105 performs input power conversion to provide the required operating voltage for each active module unit.
2. Radio frequency expansion unit REU
As shown in fig. 4, the rf expansion unit of the system is composed of a digital laser 201, a digital processing unit 202, an analog-to-digital/digital-to-analog conversion unit 203, a frequency conversion unit 204, a combining and splitting unit 205, an analog laser 206, a monitoring unit 207, and a power supply unit 208. The digital laser 201 is connected with the digital processing unit 202, the digital processing unit 202 is connected with the analog-digital/digital-analog conversion unit 203, the frequency conversion unit 204, the combining and splitting unit 205 and the analog laser 206 are sequentially connected, and the monitoring unit 207 is connected with the digital processing unit 202 and the combining and splitting unit 205.
The link connection relationship is as follows:
the digital laser 201, the digital processing unit 202, the analog-to-digital/digital-to-analog conversion unit 203, the frequency conversion unit 204, the combining and splitting unit 205 and the analog laser 206 are sequentially connected to form a downlink; the analog laser 206, the combining and splitting unit 205, the frequency conversion unit 204, the analog-to-digital/digital-to-analog conversion unit 203, the digital processing unit 202 and the digital laser 201 are sequentially connected to form an uplink. In specific implementation, the uplink and the downlink can adopt the same link and different optical wavelengths. Further, a multi-path analog-to-digital/digital-to-analog conversion unit 203, a frequency conversion unit 204, a combining and splitting unit 205, and an analog laser 206 may be provided to provide a plurality of links. Each analog-to-digital/digital-to-analog conversion unit 203 is connected with the digital processing unit 202.
The monitoring unit 207 monitors each module unit and subordinate RU. 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 downstream direction, the digital laser 201 receives the digital optical signal from the baseband processing unit BU, converts the digital optical signal into a digital signal, and transmits the digital signal to the digital processing unit 202. The digital processing unit 202 distributes the service information of each path of radio frequency remote unit RU, separates out the monitoring information sent by BU at the same time, and transmits the monitoring information to the monitoring unit 207 for processing. The analog-to-digital/digital-to-analog conversion unit 203 of each path completes the analog of the digital signal, and the digital signal is up-converted to the radio frequency by the frequency conversion unit 204 and then transmitted to the combining and splitting unit 205 after being amplified. Meanwhile, the monitoring information of the radio frequency remote unit RU is modulated into a narrowband carrier with a frequency different from that of the main signal by the monitoring unit 207 using a suitable modulation method (e.g., FSK modulation), and is also sent to the combining and splitting unit 205. After the combining and splitting unit 205 combines the carriers, the analog laser 206 directly modulates the combined carriers into an analog optical signal and transmits the analog optical signal to the radio frequency remote unit RU.
In the upstream direction, each analog laser 206 receives an upstream signal and converts the upstream signal into an electrical signal, and the electrical signal is filtered and separated by the combining and splitting unit 205. The separated monitoring carrier wave returned by the radio frequency remote unit RU is analyzed by the monitoring unit 207. The separated radio frequency carrier is amplified by the frequency conversion amplifying unit 204 and then down-converted to a digital intermediate frequency. The analog-to-digital/digital-to-analog conversion unit 203 digitizes the analog signal and passes it to the digital processing unit 202. After framing the uplink digital signals and monitoring signals sent from the monitoring unit 206, the digital processing unit 202 modulates the uplink digital signals into optical signals and sends the optical signals to the baseband signal processing unit BU by the digital laser 201.
The power supply unit 208 performs input power conversion to provide required operating voltage for each active module unit.
3. Radio frequency remote unit RU
As shown in fig. 5, the rf remote unit of the system includes an analog laser 301, a combining and splitting unit 302, a power amplifier 303, a duplexer 304, a low noise amplifier 305, a gain control unit 306, a monitoring unit 307, and a power supply unit 308. The analog laser 301 is connected to the combining and splitting unit 302, the combining and splitting unit 302 is connected to the duplexer 304 via the power amplifier 303, the duplexer 304 is connected to the combining and splitting unit 302 via the low noise amplifier 305 and the gain control unit 306, and the monitoring unit 307 is connected to the combining and splitting unit 302.
The link connection relationship is as follows:
the analog laser 301, the combining and splitting unit 302, the power amplifier 303 and the duplexer 304 are sequentially connected to form a downlink; the duplexer 304, the low noise amplifier 305, the gain control unit 306, the combining and splitting unit 302, and the analog laser 301 are connected in sequence to form an uplink.
The monitoring unit 307 monitors each module unit thereof. The power supply unit 308 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 analog laser 301 recovers the downlink signal into a radio frequency carrier, and the combining and splitting unit 302 filters and separates out a service carrier and a monitoring carrier. The monitoring carrier is distributed to the monitoring unit 307 for analysis, and the service carrier passes through the power amplifier 303. The power amplifier 303 boosts the traffic carrier signal level and its output power level can be adjusted by the monitoring unit 307 to achieve different coverage requirements. The amplified downlink signal passes through the duplexer 304 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 304 to the low noise amplifier 305. The gain control unit 306 implements automatic gain control of the uplink signal to avoid level differences caused by different distances between the user terminals, and ensure that the power of the carrier entering the laser is constant. The combining and splitting unit 302 combines the uplink main signal with the monitoring return signal sent by the monitoring unit 307, and the mixed carrier is directly modulated into analog light by the analog laser 301 and is returned to the radio frequency expansion unit REU through the optical fiber. In specific implementation, the monitoring unit 307 may communicate with the near-end monitor, control the far-end power and the rf gain, and obtain the monitor feedback 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 (8)
1. The utility model provides an indoor coverage system of distributed radio signal which characterized in that: the system comprises a base station, a unified platform, a signal source and a distribution system, wherein the unified platform is used for providing simultaneous access of various wireless communication networks, and the base station is divided into three parts for realizing distribution, comprises a baseband signal processing unit, a radio frequency expansion unit and a radio frequency far-end unit, realizes the signal source and the distribution system, adopts digital optical transmission between the baseband signal processing unit and the radio frequency expansion unit, and directly adopts analog radio over fiber transmission between the radio frequency expansion unit and the radio frequency far-end unit; the baseband signal processing unit executes a digital processing part, and the radio frequency far-end unit directly amplifies power; each radio frequency remote unit supports independent control of transmitting power, and fine coverage of each floor and each area is achieved;
the baseband signal processing unit is used for completing the modulation and demodulation from the service data to the digital modulation signal and executing the baseband part processing; the radio frequency expansion unit is used for finishing the interconversion between the digital modulation signal and the radio frequency signal and the interconversion from the radio frequency signal to the analog light;
and the radio frequency far-end 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.
2. The distributed wireless signal indoor coverage system of claim 1, wherein: the baseband signal processing unit includes a service interface unit 101, a baseband processing unit 102, a digital laser 103, and a monitoring unit 104, where the service interface unit 101 is connected to the baseband processing unit 102, the baseband processing unit 102 is connected to the digital laser 103, and the monitoring unit 104 is connected to the baseband processing unit 102.
3. The distributed wireless signal indoor coverage system of claim 1, wherein: the radio frequency expansion unit comprises a digital laser 201, a digital processing unit 202, an analog-digital/digital-analog conversion unit 203, a frequency conversion unit 204, a combining and splitting unit 205, an analog laser 206 and a monitoring unit 207, wherein the digital laser 201 is connected with the digital processing unit 202, the digital processing unit 202 is connected with the analog-digital/digital-analog conversion unit 203, the frequency conversion unit 204, the combining and splitting unit 205 and the analog laser 206 are sequentially connected, and the monitoring unit 207 is connected with the digital processing unit 202 and the combining and splitting unit 205.
4. The distributed wireless signal indoor coverage system of claim 1, wherein: the radio frequency remote unit comprises an analog laser 301, a combining and splitting unit 302, a power amplifier 303, a duplexer 304, a low noise amplifier 305, a gain control unit 306 and a monitoring unit 307, wherein the analog laser 301 is connected with the combining and splitting unit 302, the combining and splitting unit 302 is connected with the duplexer 304 through the power amplifier 303, the duplexer 304 is connected with the combining and splitting unit 302 through the low noise amplifier 305 and the gain control unit 306, and the monitoring unit 307 is connected with the combining and splitting unit 302.
5. The distributed wireless-signal indoor coverage system of claim 1, 2 or 3, wherein: the baseband signal processing unit is connected with the plurality of radio frequency extension units.
6. The distributed wireless-signal indoor coverage system of claim 1, 2 or 3, wherein: the radio frequency expansion unit is connected with a plurality of radio frequency remote units.
7. The distributed wireless-signal indoor coverage system of claim 1, 2 or 3, wherein: the radio frequency expansion unit is cascaded with other radio frequency expansion units through an expansion digital optical interface.
8. The distributed wireless-signal indoor coverage system of claim 1, 2 or 3, wherein: the radio frequency remote unit is cascaded with other radio frequency remote units through the extended analog optical interface.
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| CN201611122495.0A CN106712851B (en) | 2016-12-08 | 2016-12-08 | Distributed wireless signal coverage system |
| PCT/CN2017/107744 WO2018103469A1 (en) | 2016-12-08 | 2017-10-26 | Distributed wireless signal coverage system |
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| CN106712851A (en) | 2017-05-24 |
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