CN114401521A - Variable frequency communication transmission method and transmission system - Google Patents
Variable frequency communication transmission method and transmission system Download PDFInfo
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- CN114401521A CN114401521A CN202111541085.0A CN202111541085A CN114401521A CN 114401521 A CN114401521 A CN 114401521A CN 202111541085 A CN202111541085 A CN 202111541085A CN 114401521 A CN114401521 A CN 114401521A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a variable frequency communication transmission method and a variable frequency communication transmission system, which belong to the field of communication technology, and comprise the following steps: s1: the carrier frequency output by the air interface of the base station information source is adjusted to be low; s2: carrying out reference clock synchronization operation on signals of a base station information source; s3: the coaxial covering system transmits the reference synchronous clock to the frequency conversion system; s4: the frequency conversion system extracts a reference clock and performs frequency conversion reduction on the base station transmission signal in a frequency mixing mode; s5: and performing compensation processing on the transmitted and received signals. The method can solve the problems that the design difficulty of a high-power base station is high and the passive antenna cannot be supervised.
Description
Technical Field
The invention belongs to the field of communication technology, and particularly relates to a variable frequency communication transmission method and a variable frequency communication transmission system.
Background
In many cases, especially within buildings, tunnels, large public places, stadiums, etc., the signals from outdoor macro stations do not provide sufficient coverage field strength or the user density exceeds the capacity that can be generally handled. In these cases, the coverage of the indoor area may be optimized by installing an indoor coverage system.
As shown in fig. 1, a DAS system (distributed antenna system) is often used in the prior art, and the system is a coaxial coverage system, and is characterized in that a combination of an RRU, a passive device, a feeder line and an antenna is used, so that the system is stable and reliable, has lower cost than a base station, and can meet coverage of multiple communication systems by a multi-frequency combining manner; radio frequency connection, the information source requirement is low; but the disadvantages are also apparent: along with the increase of the frequency of the communication carrier frequency, the attenuation of different frequencies is inconsistent, the higher the frequency is, the larger the link attenuation is, the larger the space loss is, and the coverage effect is deteriorated; the reconstruction construction is difficult; the design difficulty of a high-power base station is increased, and the power consumption is increased; the passive antenna can not achieve various practical problems such as real-time management and control of the working state.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a variable frequency communication transmission method and a variable frequency communication transmission system, which can solve the problems that a high-power base station is difficult to design and a passive antenna cannot be supervised.
In order to achieve the above object, the present invention provides a frequency conversion communication transmission method, which includes the following steps:
s1: the carrier frequency output by the air interface of the base station information source is adjusted to be low;
s2: carrying out reference clock synchronization operation on signals of a base station information source;
s3: the coaxial covering system transmits the reference synchronous clock to the frequency conversion system;
s4: the frequency conversion system extracts a reference clock and performs frequency conversion reduction on the base station transmission signal in a frequency mixing mode;
s5: and performing compensation processing on the transmitted and received signals.
Specifically, in step S1, the carrier frequency after being adjusted to be lower does not conflict with the frequency bands of the sources of other wireless communication standards.
Specifically, the frequency of the carrier frequency after being adjusted down is lower than 800MHz or between 1000-1700 MHz.
Specifically, in step S4, the frequency conversion system is disposed at a front end of each antenna, and the frequency conversion system includes a mixer and a phase-locked loop.
Specifically, in step S5, the compensation system used for compensation includes a numerical control attenuator, an amplifier, and a low noise amplifier; the digital control attenuator is respectively connected with one ends of the amplifier and the low noise amplifier through a radio frequency single-pole double-throw switch, and the other ends of the amplifier and the low noise amplifier are connected with an antenna through a radio frequency single-pole double-throw switch.
The invention also provides a frequency conversion communication transmission system, which comprises a base station information source, a coaxial covering system, a frequency conversion system and an antenna;
the base station information source is used for reducing the carrier frequency output by the air interface of the base station information source and providing a reference synchronous clock for the frequency conversion system;
the coaxial covering system is used for transmitting a reference synchronous clock into the frequency conversion system;
the frequency conversion system is used for extracting a reference clock, performing frequency conversion reduction on a base station transmission signal in a frequency mixing mode, and performing compensation processing on a transmitted signal and a received signal;
the antenna is used for transmitting and receiving signals.
Specifically, in the base station information source, the reduced carrier frequency does not conflict with frequency bands of information sources of other wireless communication standards.
Specifically, the frequency of the carrier frequency after being adjusted down is lower than 800MHz or between 1000-1700 MHz.
Specifically, the frequency conversion system is arranged at the front end of each antenna, and the frequency conversion system comprises a mixer and a phase-locked loop.
Specifically, in the frequency conversion system, a compensation system adopted for compensation comprises a numerical control attenuator, an amplifier and a low noise amplifier; the digital control attenuator is respectively connected with one ends of the amplifier and the low noise amplifier through a radio frequency single-pole double-throw switch, and the other ends of the amplifier and the low noise amplifier are connected with an antenna through a radio frequency single-pole double-throw switch.
The enamel assembled excrement leaking groove provided by the invention has the following beneficial effects: compared with the existing covering system, the coaxial feeder can be compensated, and the passive device causes attenuation of high frequency; the construction difficulty is reduced, and the coverage area is effectively increased; the signal coverage cost is reduced, and the upgrading and utilization of an old coaxial feeder line system are facilitated.
Drawings
Fig. 1 is a diagram illustrating a networking scheme of a DAS system in the prior art;
fig. 2 is a flowchart of a frequency conversion communication transmission method in the present embodiment.
Fig. 3 is a schematic diagram of a frequency conversion communication transmission system in this embodiment.
Fig. 4 is a schematic diagram of a compensation system in this embodiment.
Fig. 5 is a schematic diagram of down-conversion in the present embodiment.
Fig. 6 is a schematic diagram of up-conversion in the present embodiment.
In the figure:
1. a base station information source; 2. a coaxial cover system; 3. a frequency conversion system; 4. an antenna.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make the technical field better understand the scheme of the present invention.
In the invention, the frequency band allocated to the operator in 5G (fifth generation mobile communication) in China is taken as an example for analysis (the frequency band of China mobile is 2515-2675MHz, and the frequency band of communication and telecommunication is 3300-3600MHz), and the higher frequency band causes larger attenuation in the transmission path, poorer penetrating power in microwave wireless transmission and reduced coverage area. The original coaxial feeder based on 2G \3G \4G frequency band application is difficult to meet the coverage requirement.
Referring to fig. 1, to solve the problem, an embodiment of the present invention provides a frequency conversion communication transmission method, which can act between a base station source and an antenna, modulate a signal of the base station source and transmit the modulated signal to the antenna, and the method specifically includes the following steps:
s1: and adjusting the carrier frequency output by the air interface of the base station information source to a lower frequency.
And the adjusted carrier frequency can not conflict with the frequency bands of the information sources of other wireless communication standards. Taking 5G as an example, the adjusted frequency band may not conflict with other 2G, 3G, 4G information sources. The adjusted frequency band is not fixed, the lowest 825MHz of the existing mobile communication frequency band can be selected to be lower than the frequency, such as lower than 800MHz, and the frequency can be converted to the non-use frequency band, such as between 1000-1700 MHz.
S2: and carrying out reference clock synchronization operation on the signal of the base station source. The reason for performing the reference clock synchronization operation is that the system needs to perform frequency conversion processing in subsequent steps, and only when the clocks are synchronized and a single clock is used for frequency conversion and restoration, the frequency does not deviate. The PLL is a phase locked loop and needs to be synchronized with the clock of the base station to avoid signal degradation caused by the clock, such as product frequency error.
S3: the coaxial overlay system transmits the reference synchronous clock to the frequency conversion system. The purpose of this step is to ensure that the clocks are the same, wherein a frequency conversion system is arranged at the front end of each antenna, and the coaxial coverage system is the existing DAS system, and the frequency conversion system mainly comprises a mixer and a phase-locked loop (PLL).
S4: and the frequency conversion system extracts the reference clock and performs frequency conversion reduction on the base station transmission signal in a frequency mixing mode. Specifically, as shown in fig. 6, the transmitting link performs up-conversion, the input radio frequency is subjected to frequency conversion by the mixer, and the output is an intermediate frequency, that is, the frequency conversion frequency + LO frequency point is the original frequency; as shown in fig. 5, the receiving link performs down-conversion, the input intermediate frequency is frequency-converted by the mixer, and the output is a radio frequency, that is, the original frequency-LO frequency point is the conversion frequency.
Wherein, the frequency conversion reduction process comprises the following steps: the frequency conversion frequency + LO frequency point is equal to the original frequency, the original frequency-LO frequency point is equal to the frequency conversion frequency, and the LO is the local oscillation frequency point, that is to say, the output of the PLL. For example, the existing 5G carrier frequency of the telecom communication is 3400-3600MHz (central frequency point 3500MHz), and the frequency can be converted to 500-700MHz (central frequency point 600MHz), and the LO frequency point is 2900MHz, so the frequency point after frequency conversion is 3500MHz-2900 MHz-600 MHz, which is only illustrated by way of example, and the frequency band after frequency conversion is adjustable and is not a fixed frequency band.
S5: and carrying out compensation processing on the transmitted and received signals so as to meet the requirement of field intensity. The compensated signal power is increased, and the coverage range can be increased.
Wherein, transmission refers to TX link, i.e. base station to terminal transmission process, and reception refers to RX link, i.e. terminal to base station transmission process.
As shown in fig. 4, the compensation system adopted in the compensation process includes a digitally controlled attenuator ATT, an amplifier AMP, and a low noise amplifier LNA; the digital control attenuator is used for adjusting the output power, the amplifier is used for amplifying the sending signal, and the low-noise amplifier is used for amplifying the receiving signal. The digital control attenuator ATT is respectively connected with one end of an amplifier AMP and one end of a low noise amplifier LNA through a radio frequency single-pole double-throw switch SPDT, specifically, a transmitted signal TX is sent to the amplifier AMP through the digital control attenuator ATT, and a signal received by an antenna is processed by the low noise amplifier LNA to form a received signal RX. The other ends of the amplifier AMP and the low noise amplifier LNA are connected to the antenna 4 through a radio frequency single pole double throw switch SPDT.
A mixer is connected between the digitally controlled attenuator ATT and the amplifier AMP and the low noise amplifier LNA, the mixer being connected to a Phase Locked Loop (PLL) for reference synchronous clocking of the signals.
As shown in fig. 3, an embodiment of the present invention further provides a frequency conversion communication transmission system for implementing the communication transmission method, where the frequency conversion communication transmission system includes a base station information source 1, a coaxial coverage system 2, a frequency conversion system 3, and an antenna 4, and compared with a networking system of the DAS system shown in fig. 1, the frequency conversion system 3 is added; wherein:
the base station information source 1 is used for changing the carrier frequency output by the air interface of the base station information source to a lower frequency and providing a reference synchronous clock for a frequency conversion system;
and the adjusted carrier frequency can not conflict with the frequency bands of the information sources of other wireless communication standards. Taking 5G as an example, the adjusted frequency band may not conflict with other 2G, 3G, 4G information sources. The adjusted frequency band is not fixed, the lowest 825MHz of the existing mobile communication frequency band can be selected to be lower than the frequency, such as lower than 800MHz, and the frequency can be converted to the non-use frequency band, such as between 1000-1700 MHz.
The reason for performing the reference clock synchronization operation is that the frequency conversion process is performed in the system, and only when the clock is synchronized, the frequency conversion process is performed by using a single clock and the frequency is restored, the frequency does not shift. The PLL is a phase locked loop and needs to be synchronized with the clock of the base station to avoid signal degradation caused by the clock, such as product frequency error.
And the coaxial covering system 2 is used for transmitting the reference synchronous clock to the frequency conversion system. The frequency conversion system is arranged at the front end of each antenna, the coaxial coverage system is the existing DAS system, and the frequency conversion system mainly comprises a frequency mixer and a phase-locked loop (PLL).
The frequency conversion system 3 is used for extracting a reference clock and carrying out frequency conversion reduction on the base station transmission signal in a frequency mixing mode; and then the signals received and transmitted by the frequency conversion communication transmission system are compensated, so that the field intensity is met. Specifically, as shown in fig. 6, the transmitting link performs up-conversion, the input radio frequency is subjected to frequency conversion by the mixer, and the output is an intermediate frequency, that is, the frequency conversion frequency + LO frequency point is the original frequency; as shown in fig. 5, the receiving link performs down-conversion, the input intermediate frequency is frequency-converted by the mixer, and the output is a radio frequency, that is, the original frequency-LO frequency point is the conversion frequency.
Wherein, the frequency conversion reduction process comprises the following steps: the frequency conversion frequency + LO frequency point is equal to the original frequency, the original frequency-LO frequency point is equal to the frequency conversion frequency, and the LO is the local oscillation frequency point, that is to say, the output of PLL. For example, the existing 5G carrier frequency of the telecom communication is 3400-3600MHz (central frequency point 3500MHz), and the frequency can be converted to 500-700MHz (central frequency point 600MHz), and the LO frequency point is 2900MHz, so the frequency point after frequency conversion is 3500MHz-2900 MHz-600 MHz, which is only illustrated by way of example, and the frequency band after frequency conversion is adjustable and is not a fixed frequency band.
The compensated signal power is increased, and the coverage range can be increased. Wherein, transmission refers to TX link, i.e. base station to terminal transmission process, and reception refers to RX link, i.e. terminal to base station transmission process.
As shown in fig. 4, the compensation system adopted in the compensation process includes a digitally controlled attenuator ATT, an amplifier AMP, and a low noise amplifier LNA; the digital control attenuator is used for adjusting the output power, the amplifier is used for amplifying the sending signal, and the low-noise amplifier is used for amplifying the receiving signal. The digital control attenuator ATT is respectively connected with one end of an amplifier AMP and one end of a low noise amplifier LNA through a radio frequency single-pole double-throw switch SPDT, specifically, a transmitted signal TX is sent to the amplifier AMP through the digital control attenuator ATT, and a signal received by an antenna is processed by the low noise amplifier LNA to form a received signal RX. The other ends of the amplifier AMP and the low noise amplifier LNA are connected to the antenna 4 through a radio frequency single pole double throw switch SPDT.
A mixer is connected between the digitally controlled attenuator ATT and the amplifier AMP and the low noise amplifier LNA, the mixer being connected to a Phase Locked Loop (PLL) for reference synchronous clocking of the signals.
And an antenna 4 for performing transmitting and receiving operations on the signal.
In the invention, the frequency conversion system is arranged at the front section of the antenna, so that the attenuation of high frequency caused by the coaxial feeder and the passive device can be compensated, the signal coverage cost is reduced, and the upgrading and utilization of the old coaxial feeder system are facilitated.
The inventive concept is explained in detail herein using specific examples, which are given only to aid in understanding the core concepts of the invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A frequency conversion communication transmission method is characterized by comprising the following steps:
s1: the carrier frequency output by the air interface of the base station information source is adjusted to be low;
s2: carrying out reference clock synchronization operation on signals of a base station information source;
s3: the coaxial covering system transmits the reference synchronous clock to the frequency conversion system;
s4: the frequency conversion system extracts a reference clock and performs frequency conversion reduction on the base station transmission signal in a frequency mixing mode;
s5: and performing compensation processing on the transmitted and received signals.
2. The method for transmitting communication with variable frequency according to claim 1, wherein in step S1, the frequency of the carrier frequency after being reduced does not conflict with the frequency bands of the sources of other wireless communication standards.
3. The method of claim 2, wherein the reduced carrier frequency is lower than 800MHz or between 1000-1700 MHz.
4. The method according to claim 1, wherein in step S4, the frequency conversion system is disposed at a front end of each antenna, and the frequency conversion system includes a mixer and a phase-locked loop.
5. The frequency-conversion communication transmission method according to claim 1, wherein in step S5, the compensation system used for compensation includes a digitally controlled attenuator, an amplifier, and a low noise amplifier; the digital control attenuator is respectively connected with one ends of the amplifier and the low noise amplifier through a radio frequency single-pole double-throw switch, and the other ends of the amplifier and the low noise amplifier are connected with an antenna through a radio frequency single-pole double-throw switch.
6. A frequency conversion communication transmission system is characterized by comprising a base station information source, a coaxial covering system, a frequency conversion system and an antenna;
the base station information source is used for reducing the carrier frequency output by the air interface of the base station information source and providing a reference synchronous clock for the frequency conversion system;
the coaxial covering system is used for transmitting a reference synchronous clock into the frequency conversion system;
the frequency conversion system is used for extracting a reference clock, performing frequency conversion reduction on a base station transmission signal in a frequency mixing mode, and performing compensation processing on a transmitted signal and a received signal;
the antenna is used for transmitting and receiving signals.
7. The frequency-converted communication transmission system of claim 6, wherein the frequency of the reduced carrier frequency in the source of the base station does not conflict with the frequency bands of the sources of other wireless communication standards.
8. The frequency-converted communication transmission system of claim 7, wherein the reduced carrier frequency is lower than 800MHz or between 1000-1700 MHz.
9. The frequency-converted communication transmission system of claim 6, wherein the frequency conversion system is disposed at a front end of each antenna, the frequency conversion system comprising a mixer and a phase-locked loop.
10. The frequency conversion communication transmission system according to claim 6, wherein the compensation system for compensation in the frequency conversion system comprises a numerical control attenuator, an amplifier and a low noise amplifier; the digital control attenuator is respectively connected with one ends of the amplifier and the low noise amplifier through a radio frequency single-pole double-throw switch, and the other ends of the amplifier and the low noise amplifier are connected with an antenna through a radio frequency single-pole double-throw switch.
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| CN202111541085.0A CN114401521A (en) | 2021-12-16 | 2021-12-16 | Variable frequency communication transmission method and transmission system |
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| CN202111541085.0A CN114401521A (en) | 2021-12-16 | 2021-12-16 | Variable frequency communication transmission method and transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116032341A (en) * | 2023-03-09 | 2023-04-28 | 深圳国人无线通信有限公司 | Configuration method of base station parameters and base station |
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| WO2016019843A1 (en) * | 2014-08-06 | 2016-02-11 | 华为技术有限公司 | Multi-antenna implementation method, device and system |
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- 2021-12-16 CN CN202111541085.0A patent/CN114401521A/en active Pending
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| CN1859033A (en) * | 2005-10-14 | 2006-11-08 | 华为技术有限公司 | System and its method for obtaining reference clock in frequency-shift repeater |
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| WO2016019843A1 (en) * | 2014-08-06 | 2016-02-11 | 华为技术有限公司 | Multi-antenna implementation method, device and system |
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