CN114024557A

CN114024557A - Signal transmission and covering method, signal access and covering unit

Info

Publication number: CN114024557A
Application number: CN202111405030.7A
Authority: CN
Inventors: 刘江涛; 谢路平; 李雪平; 樊奇彦
Original assignee: Comba Network Systems Co Ltd
Current assignee: Comba Network Systems Co Ltd
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2022-02-08
Anticipated expiration: 2041-11-24
Also published as: CN114024557B

Abstract

The invention provides a signal transmission and covering method and a signal access and covering unit, wherein the method applied to the signal access unit or the signal covering unit comprises the following steps: the method comprises the steps of receiving a high-frequency signal, obtaining a signal bandwidth of the high-frequency signal, determining a down-conversion bandwidth range where the signal bandwidth is located from a plurality of preset down-conversion bandwidth ranges, controlling down-conversion of the high-frequency signal to an intermediate-frequency signal according to the down-conversion bandwidth range where the signal bandwidth is located, and transmitting the intermediate-frequency signal.

Description

Signal transmission and covering method, signal access and covering unit

Technical Field

The present invention relates to the field of signal coverage, and more particularly, to a signal transmission and coverage method, and a signal access and coverage unit.

Background

Through years of technical development and revolution, communication technology has evolved from 2G to the 5G era in order to meet social development and living needs of people. The traffic volume, the communication rate and the bandwidth borne by the communication network are increased rapidly, which puts high demands on communication equipment, and especially in the coming 5G communication era, the application requirements under the scenes of interconnection of everything, ultra-large bandwidth, ultra-low time delay and the like need to be met. Under the condition of multi-band coexistence, the existing signal coverage equipment for signal coverage of a target area exposes practical problems, such as large development difficulty due to multiple equipment types, poor signal coverage performance, high equipment cost and the like.

The existing non-base station signal coverage equipment comprises an optical fiber repeater, a digital Distributed Antenna System (DAS), a wireless repeater and the like, wherein the signal access mode mainly comprises a radio frequency coupling access mode and a wireless coupling access mode, the signal transmission mode mainly comprises an optical fiber remote mode, a wireless transmission mode and the like, and the coverage mode is mostly same-frequency coverage.

However, in some specific situations, the adaptability of these signal coverage devices is poor, and in order to adapt to different scenes, a great variety of signal coverage devices need to be developed, and the cost of frequently developing and maintaining hardware devices is greatly increased, which results in a great waste of resources. Meanwhile, the signal coverage equipment has larger transmission loss in the process of transmitting high-frequency signals, but the frequency conversion of the signal coverage equipment is not flexible enough in the signal transmission process, so that the transmission loss can not be reduced to the maximum extent, and meanwhile, the design difficulty of the equipment is greatly increased by transmitting the high-frequency signals.

Disclosure of Invention

The present invention is directed to overcome at least one of the above-mentioned drawbacks of the prior art, and provides a signal transmission and coverage method, a signal access and coverage unit, which are used to solve the problems that the existing signal coverage equipment has poor adaptability, high design and manufacturing cost, and cannot reduce transmission loss to the maximum.

The technical scheme adopted by the invention comprises the following steps:

in a first aspect, the present invention provides a signal transmission method applied to a signal access unit or a signal coverage unit, including: the method comprises the steps of receiving a high-frequency signal, obtaining the signal bandwidth of the high-frequency signal, determining a down-conversion bandwidth range where the signal bandwidth is located from a plurality of preset down-conversion bandwidth ranges, controlling the down-conversion of the high-frequency signal to an intermediate-frequency signal according to the down-conversion bandwidth range where the signal bandwidth is located, and transmitting the intermediate-frequency signal.

In a second aspect, the present invention provides a signal covering method applied to a signal covering unit, including: receiving an intermediate frequency downlink signal, acquiring a signal bandwidth of the intermediate frequency downlink signal, determining an up-conversion bandwidth range where the signal bandwidth is located from one or more preset up-conversion bandwidth ranges, controlling the intermediate frequency downlink signal to be up-converted to a high frequency coverage signal according to the up-conversion bandwidth range where the signal bandwidth is located, and covering the high frequency coverage signal to a target area.

In a third aspect, the present invention provides a signal access unit, including: the signal input interface is used for receiving a high-frequency downlink signal; the signal bandwidth detection module is used for acquiring the signal bandwidth of the high-frequency downlink signal; the micro-processing module is used for determining a bandwidth range where the signal bandwidth is located from a plurality of preset down-conversion bandwidth ranges, and determining the intermediate frequency of the high-frequency downlink signal after down-conversion according to the down-conversion bandwidth range where the signal bandwidth is located; the frequency conversion module is used for controlling the down-conversion of the high-frequency downlink signal to an intermediate-frequency downlink signal according to the intermediate-frequency; and the signal output interface is used for transmitting the intermediate frequency downlink signal.

In a fourth aspect, the present invention provides a signal covering unit, comprising: the signal coverage interface is used for receiving a high-frequency uplink signal; the radio frequency transceiving module is used for acquiring the signal bandwidth of the high-frequency uplink signal, determining a down-conversion bandwidth range in which the signal bandwidth is located from a plurality of preset down-conversion bandwidth ranges, and controlling the down-conversion of the high-frequency uplink signal to an intermediate-frequency uplink signal according to the down-conversion bandwidth range in which the signal bandwidth is located; and the signal transmission interface outputs the intermediate frequency uplink signal.

In a fifth aspect, the present invention provides a signal covering unit, comprising: the signal transmission interface is used for receiving the intermediate frequency downlink signal; the radio frequency transceiving module is used for acquiring the signal bandwidth of the intermediate frequency downlink signal, determining an up-conversion bandwidth range in which the signal bandwidth is located from one or more preset up-conversion bandwidth ranges, and controlling the intermediate frequency downlink signal to be up-converted to a high-frequency coverage signal according to the up-conversion bandwidth range in which the signal bandwidth is located; and the signal coverage interface is used for covering the high-frequency coverage signal to a target area.

Compared with the prior art, the invention has the beneficial effects that:

the embodiment of the invention provides a signal transmission method applied to a signal access unit/a signal coverage unit, and provides the signal access unit and the signal coverage unit, after receiving the high-frequency signal, the unit down-converts the high-frequency signal to obtain an intermediate-frequency signal and then transmits the intermediate-frequency signal in the next step, so that the transmission loss is reduced in the transmission process, in the down-conversion process, one down-conversion bandwidth range in a plurality of preset down-conversion bandwidth ranges is determined based on the signal bandwidth of the high-frequency signal, the frequency of the down-converted intermediate-frequency signal is determined according to the down-conversion bandwidth range, the central frequency of the down-converted intermediate-frequency signal is minimized to the greatest extent and flexibly, the transmission loss is reduced to the greatest extent, the overall method is low in operation difficulty and high in operation efficiency, and the design cost and the design difficulty of a unit for operating the method are low.

The signal covering method applied to the signal covering unit is characterized in that after receiving an intermediate frequency downlink signal transmitted by a signal access unit, the intermediate frequency downlink signal is subjected to up-conversion to obtain a high frequency covering signal, and then the high frequency covering signal is covered to a target area.

Drawings

Fig. 1 is a schematic flow chart of steps S110 to S150 in one embodiment of the present invention.

Fig. 2 is a schematic flow chart of steps S141 to S142 in one embodiment of the present invention.

FIG. 3 is a flowchart illustrating steps S210-S250 according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating steps S241-S242 according to one embodiment of the present invention.

FIG. 5 is a flowchart illustrating steps S310-S340 according to an embodiment of the present invention.

FIG. 6 is a flowchart illustrating steps S331-S332 according to an embodiment of the present invention.

Fig. 7 is a schematic diagram of a signal access unit according to an embodiment of the present invention.

Fig. 8 is a schematic diagram of a signal covering unit according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of a signal covering unit according to an embodiment of the present invention.

Fig. 10 is a schematic diagram of a signal overlay apparatus according to an embodiment of the present invention.

Fig. 11 is a schematic diagram of a signal overlay apparatus according to an embodiment of the present invention.

Detailed Description

The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The embodiment provides a downlink signal transmission method, which is applied to a signal access unit.

The method is used for flexibly carrying out down-conversion on the high-frequency downlink signal according to the signal bandwidth of the high-frequency downlink signal in the transmission process, so that the down-converted downlink signal can reduce the transmission loss to the maximum extent in the transmission process.

The signal access unit is the main body of the method, and refers to a unit capable of receiving a downlink signal from a radio transceiver station such as a base station, and also refers to a unit capable of transmitting an uplink signal to a radio transceiver station such as a base station, and is not a part for interacting with a base station in a non-base station type signal coverage device, but is not a part for directly covering a signal.

As shown in fig. 1, the steps of the method include:

s110: receiving a high-frequency downlink signal;

in this step, the high frequency downlink signal is obtained by coupling from a radio transceiver station such as a base station, and the signal coupling mode mainly includes a radio frequency coupling access mode or a wireless coupling access mode. The downlink signal refers to a signal transmitted from a radio transceiver station such as a base station to a mobile terminal, and belongs to a signal transmitted in a downlink, and the frequency of the downlink signal generally reaches over 1000MHz and is a high-frequency signal.

After receiving the high-frequency downlink signal, in order to suppress noise in the high-frequency downlink signal, filtering the high-frequency downlink signal is required before executing the next step, before executing this step, the operating frequency of the high-frequency filtering module for performing high-frequency signal filtering in the signal access unit should be preset according to the source type of the wireless transceiver station, such as a base station, which couples the signals, and the signal frequency band of the coupled high-frequency downlink signal can be predetermined according to the source type, where the determined signal frequency band is the preset operating frequency of the high-frequency filtering module.

In this step, if more than two high-frequency downlink signals are received, the subsequent steps in this embodiment are performed for each high-frequency downlink signal respectively until the end.

S120: acquiring the signal bandwidth of a high-frequency downlink signal;

in this step, the signal bandwidth refers to the difference between the highest frequency and the lowest frequency of the harmonic contained in a signal, i.e. the frequency range possessed by the signal.

S130: determining a down-conversion bandwidth range in which the signal bandwidth is located from a plurality of preset down-conversion bandwidth ranges;

in this step, several ranges of the down-conversion bandwidth are preset, and the range of the down-conversion bandwidth refers to a numerical range consisting of a maximum bandwidth and a minimum bandwidth. If a plurality of down-conversion bandwidth ranges are discontinuous, and the signal bandwidth may not fall into any one down-conversion bandwidth range, it is necessary to determine a down-conversion bandwidth range in which the signal bandwidth is located according to a preset strategy. If there is continuity between several ranges of downconversion bandwidth, the range of downconversion bandwidth within which the acquired signal bandwidth falls can be determined directly. If a plurality of down-conversion bandwidth ranges are overlapped, the signal bandwidth may fall into more than one down-conversion bandwidth range, and a down-conversion bandwidth range in which the signal bandwidth is located needs to be determined according to a preset strategy. If several ranges of the down-conversion bandwidth do not overlap with each other, one of the ranges of the down-conversion bandwidth within which the acquired signal bandwidth falls can be directly determined.

S140: controlling the down-conversion of the high-frequency downlink signal to an intermediate-frequency downlink signal according to the bandwidth range of the signal bandwidth;

in this step, down-conversion refers to a process of mixing a frequency of a mixed signal to be lower than a frequency of an original signal. Because the down-conversion bandwidth range is provided with a plurality of down-conversion bandwidth ranges, and the signal bandwidth only falls into one of the down-conversion bandwidth ranges, the down-conversion process of the signal can be flexibly controlled according to the difference of the down-conversion bandwidth range in which the signal bandwidth is positioned, and the frequency of the intermediate frequency downlink signal obtained by down-conversion is minimized to the greatest extent, so that the transmission loss can be reduced to the greatest extent when the intermediate frequency downlink signal is transmitted in the subsequent steps.

Specifically, each down-conversion bandwidth range corresponds to one center frequency, and the correspondence is preset. The center frequency refers to the frequency in the middle of the filter passband and also to the geometric mean of the frequencies of the band signals. Based on this, as shown in fig. 2, step S140 specifically includes the following steps:

s141: determining a center frequency corresponding to a down-conversion bandwidth range in which a signal bandwidth is positioned;

each down-conversion bandwidth range corresponds to one center frequency, the signal bandwidth only falls into one of the several down-conversion bandwidth ranges, and then only one center frequency is determined in the step.

A positive correlation exists between the down-conversion bandwidth range and the corresponding central frequency, and the smaller the minimum bandwidth of the down-conversion bandwidth range is, that is, the smaller the value covered by the down-conversion bandwidth range is, the lower the corresponding central frequency is, for example, a down-conversion bandwidth range a is greater than or equal to 0MHz and less than 10MHz, and the minimum bandwidth is 0 MHz; the other down-conversion bandwidth range B is more than or equal to 10MHz and less than 40MHz, and the minimum bandwidth is 10 MHz; the center frequency corresponding to the down-conversion bandwidth range a is lower than the center frequency corresponding to the bandwidth range B. The smaller the minimum bandwidth of the down-conversion bandwidth range is, the lower the corresponding center frequency is, which is beneficial to minimizing the center frequency of the intermediate frequency downlink signal obtained by down-conversion, and the center frequency is flexibly selected in the down-conversion process instead of being based on a fixed center frequency, thereby reducing the transmission loss to the maximum extent.

If the number of the preset down-conversion bandwidth ranges is too large, the operation efficiency of the step may be affected, and if the number of the preset down-conversion bandwidth ranges is too small, the adaptability of the overall method and the effect of reducing the transmission loss may be affected.

Preferably, based on the general communication signal, the first down-conversion bandwidth range is preset to be greater than 0MHz and less than or equal to 20MHz, the corresponding center frequency is a first frequency, and the first frequency is preferably 20 MHz; the second down-conversion bandwidth range is preset to be more than 20MHz and less than or equal to 50MHz, the corresponding center frequency is a second frequency, and the second frequency is preferably 50 MHz; the third down-conversion bandwidth range is preset to be more than 50MHz and less than or equal to 100MHz, the corresponding center frequency is a third frequency, and the third frequency is preferably 100 MHz; the fourth down-conversion bandwidth range is preset to be greater than 100MHz, the corresponding center frequency is a fourth frequency, the fourth frequency is preferably (BW/2+50) MHz, and BW is the acquired signal bandwidth.

The number of the down-conversion bandwidth ranges is moderate, the bandwidth of the existing general communication signal is considered in the 4 preset down-conversion bandwidth ranges, the communication signals of various information source types can relatively and uniformly fall into the 4 down-conversion bandwidth ranges, the down-conversion process can be carried out according to the corresponding central frequency, the whole method is suitable for the communication signals of various information source types, and the environment adaptability is strong.

S142: controlling the down-conversion of the high-frequency downlink signal to an intermediate-frequency downlink signal according to the determined center frequency;

in this step, the determined center frequency represents the center frequency of the intermediate frequency downlink signal obtained by down-converting the high frequency downlink signal, and the bandwidths of the high frequency downlink signal before down-conversion and the intermediate frequency downlink signal after down-conversion are not changed, so that after the center frequency of the intermediate frequency downlink signal is determined, the frequency band in which the intermediate frequency downlink signal is located can also be determined. Meanwhile, preferably, in order to suppress noise in the intermediate frequency downlink signal obtained by the down-conversion, after the down-conversion and before the next step is performed, the intermediate frequency downlink signal needs to be filtered by using an intermediate frequency filtering module used for filtering the intermediate frequency downlink signal in the signal access unit, and the center frequency of the selected center frequency intermediate frequency filtering module is the center frequency determined in this step.

S150: and transmitting the intermediate frequency downlink signal.

In this step, the transmission of the intermediate frequency downlink signal refers to transmitting the signal to a next-stage unit in the downlink, that is, a portion directly used for signal coverage in the signal coverage device, and the portion generally refers to a signal coverage unit in the signal coverage device. Preferably, in this step, the intermediate frequency downlink signal may be transmitted after being power-amplified. The transmission is generally carried out by means of radio frequency wires or optical fibers, and preferably by means of radio frequency wires.

The present embodiment provides a signal transmission method applied to a signal access unit, where the signal transmission specifically refers to downlink signal transmission. After receiving the high-frequency downlink signal, the method carries out down-conversion on the high-frequency downlink signal to obtain an intermediate-frequency downlink signal, and then carries out the next transmission, so that the transmission loss is reduced in the transmission process, the method determines the center frequency of the intermediate frequency downlink signal after down-conversion based on the signal bandwidth of the high frequency downlink signal, and specifically determines one down-conversion bandwidth range in a plurality of preset down-conversion bandwidth ranges according to the signal bandwidth of the high frequency downlink signal, the smaller the minimum bandwidth of the down-conversion bandwidth range, the lower the corresponding center frequency is, the center frequency of the intermediate frequency downlink signal obtained by down-conversion can be minimized to the maximum extent based on the relation, the transmission loss can be reduced to the maximum extent, the overall method is low in operation difficulty and high in operation efficiency, and the design cost and the design difficulty of a unit for operating the method are low.

In one embodiment, based on the same concept as the previous embodiments, a signal transmission method is provided, which is applied to a signal covering unit.

The method is used for carrying out down-conversion after receiving the high-frequency uplink signal, and flexibly selecting the center frequency of the intermediate-frequency uplink signal obtained after the down-conversion according to the signal bandwidth of the high-frequency uplink signal in the down-conversion process, so that the transmission loss of the intermediate-frequency uplink signal after the down-conversion is reduced in the transmission process.

The signal coverage unit is the main body of the method, and refers to a unit capable of directly receiving a signal transmitted from a terminal in a target area, and also refers to a portion for performing signal coverage to the target area in a non-base station type signal coverage device, but not a portion for directly transmitting an uplink signal to a radio transceiver station such as a base station. The target area is an area where a terminal that transmits a signal to a radio transceiver station such as a base station is located.

As shown in fig. 3, the steps of the method include:

s210: receiving a high-frequency uplink signal;

in this step, the high frequency uplink signal is received from a terminal in the target area. The uplink signal is a signal transmitted from a mobile terminal to a radio transceiver station such as a base station, and is a signal transmitted in an uplink, and the frequency is generally 1000MHz or higher, and is a high frequency signal.

After receiving the high-frequency uplink signal, in order to suppress noise in the high-frequency uplink signal, before executing the next step, the high-frequency uplink signal may be filtered by using a high-frequency filtering module for filtering the high-frequency signal in the signal covering unit, and before executing this step, the operating frequency of the high-frequency filtering module should be preset according to one of available signal frequency bands in the target area, where the available signal frequency band is the preset operating frequency band of the high-frequency filtering module.

In this step, if more than two high-frequency uplink signals are received, the subsequent steps in this embodiment are performed once for each high-frequency uplink signal, respectively, until the end.

S220: acquiring the signal bandwidth of a high-frequency uplink signal;

S230: determining a down-conversion bandwidth range in which the signal bandwidth is located from a plurality of preset down-conversion bandwidth ranges;

in this step, several ranges of the down-conversion bandwidth are preset, and the range of the down-conversion bandwidth refers to a numerical range consisting of a maximum bandwidth and a minimum bandwidth. If the down-conversion bandwidth ranges are discontinuous, the signal bandwidth may not fall into any one of the down-conversion bandwidth ranges, and then the signal bandwidth needs to be in one of the down-conversion bandwidth ranges according to a preset strategy. If there is continuity between several ranges of downconversion bandwidth, the range of downconversion bandwidth within which the acquired signal bandwidth falls can be determined directly. If a plurality of down-conversion bandwidth ranges are overlapped, the signal bandwidth may fall into more than one down-conversion bandwidth range, and a down-conversion bandwidth range in which the signal bandwidth is located needs to be determined according to a preset strategy. If several ranges of the down-conversion bandwidth do not overlap with each other, one of the ranges of the down-conversion bandwidth within which the acquired signal bandwidth falls can be directly determined.

S240: controlling the down-conversion of the high-frequency uplink signal to the intermediate-frequency uplink signal according to the bandwidth range of the signal bandwidth;

in this step, down-conversion refers to a process of mixing a frequency of a mixed signal to be lower than a frequency of an original signal. Because the down-conversion bandwidth range is provided with a plurality of down-conversion bandwidth ranges, and the signal bandwidth only falls into one of the down-conversion bandwidth ranges, the down-conversion process of the signal can be flexibly controlled according to the difference of the down-conversion bandwidth range in which the signal bandwidth is positioned, and the frequency of the intermediate frequency uplink signal obtained by down-conversion is minimized to the greatest extent, so that the transmission loss can be reduced to the greatest extent when the intermediate frequency uplink signal is transmitted in the subsequent steps.

Specifically, each down-conversion bandwidth range corresponds to one center frequency, and the correspondence is preset. The center frequency refers to the frequency in the middle of the filter passband and also to the geometric mean of the frequencies of the band signals. Based on this, as shown in fig. 4, step S340 specifically includes the following steps:

s241: determining a center frequency corresponding to a down-conversion bandwidth range in which a signal bandwidth is positioned;

The positive correlation exists between the down-conversion bandwidth range and the corresponding central frequency, the smaller the minimum bandwidth of the down-conversion bandwidth range is, namely the smaller the numerical value covered by the down-conversion bandwidth range is, the lower the corresponding central frequency is, which is beneficial to minimizing the central frequency of the intermediate frequency uplink signal obtained by down-conversion, and the central frequency is flexibly selected in the down-conversion process instead of being based on a fixed central frequency, so that the transmission loss is reduced to the maximum extent.

S242: controlling the down-conversion of the high-frequency uplink signal to an intermediate-frequency uplink signal according to the determined center frequency;

in this step, the determined center frequency represents the center frequency of the intermediate frequency signal obtained after performing down-conversion on the high-frequency uplink signal, and the bandwidths of the high-frequency uplink signal before the down-conversion and the intermediate frequency uplink signal after the down-conversion are not changed, so that after the center frequency of the intermediate frequency uplink signal is determined, the frequency band in which the intermediate frequency uplink signal is located can also be determined. Meanwhile, preferably, in order to suppress noise in the intermediate frequency uplink signal obtained by the down-conversion, after the down-conversion and before the next step is performed, the intermediate frequency uplink signal may be filtered by using an intermediate frequency filtering module used for filtering the intermediate frequency uplink signal in the signal covering unit, and a center frequency of the selected intermediate frequency filtering module is the center frequency determined in this step.

S250: and transmitting the intermediate frequency uplink signal.

In this step, the transmission of the intermediate frequency uplink signal refers to transmitting the signal to a next unit in the uplink, that is, a signal interaction part with a radio transceiver station such as a base station in the signal coverage equipment, and the part generally refers to a signal access unit in the signal coverage equipment. Preferably, in this step, the intermediate frequency uplink signal is transmitted after being power-amplified. The transmission is generally carried out by means of radio frequency wires or optical fibers, and preferably by means of radio frequency wires.

Specifically, after receiving the intermediate frequency uplink signal transmitted by the signal covering unit, the signal access unit performs intermediate frequency filtering on the intermediate frequency uplink signal, then up-converts the intermediate frequency uplink signal to a high frequency uplink signal, and filters the high frequency uplink signal and then transmits the high frequency uplink signal back to the radio transceiver station such as the base station, thereby completing uplink signal transmission.

The embodiment provides a signal transmission method applied to a signal coverage unit, and the signal transmission specifically refers to uplink signal transmission. After receiving the high-frequency uplink signal, the method carries out down-conversion on the high-frequency uplink signal to obtain an intermediate-frequency uplink signal, and then carries out next-step transmission, so that the transmission loss is reduced in the transmission process, the method determines the center frequency of the intermediate frequency uplink signal after down-conversion based on the signal bandwidth of the high frequency uplink signal, and specifically determines one down-conversion bandwidth range in a plurality of preset down-conversion bandwidth ranges according to the signal bandwidth of the high frequency uplink signal, wherein the smaller the minimum bandwidth of the down-conversion bandwidth range, the lower the corresponding center frequency is, the center frequency of the intermediate frequency uplink signal obtained by down-conversion can be minimized to the maximum extent based on the relation, the transmission loss is reduced to the maximum extent, the overall method is low in operation difficulty and high in operation efficiency, and the design cost and the design difficulty of a unit for operating the method are low.

In one embodiment, based on the same concept as the previous embodiments, a downlink signal covering method is provided, which is applied to a signal covering unit.

The method is used for carrying out up-conversion after receiving the intermediate frequency downlink signal transmitted by the signal access unit, and flexibly selects the frequency of the high-frequency coverage signal obtained after up-conversion according to the signal bandwidth of the intermediate frequency downlink signal and the available frequency band of the target area in the up-conversion process, so that the cost brought in the execution process of the method is reduced as much as possible, and the design difficulty of a unit for executing the method is reduced.

The signal coverage unit is an execution subject of the method, and refers to a unit capable of performing signal coverage to a target area after receiving a downlink signal, and is also a part directly covering a signal in a non-base station type signal coverage device. The target area is an area where a terminal that finally receives a downlink signal transmitted by a radio transceiver station such as a base station is located, that is, an area to be covered by a signal.

As shown in fig. 5, the steps of the method include:

s310: receiving an intermediate frequency downlink signal;

in this step, the intermediate frequency downlink signal is received from the signal access unit. The intermediate frequency downlink signal refers to an intermediate frequency downlink signal. Preferably, in order to suppress noise in the intermediate frequency downstream signal, the intermediate frequency downstream signal may be preliminarily filtered by an intermediate frequency filtering module in the signal covering unit before the next step is performed.

In this step, if more than two intermediate frequency downlink signals are received, the subsequent steps in this embodiment are performed for each intermediate frequency downlink signal respectively until the end.

S320: acquiring the signal bandwidth of an intermediate frequency downlink signal, and determining an up-conversion bandwidth range in which the signal bandwidth is located from one or more preset up-conversion bandwidth ranges;

in this step, one or more upconversion bandwidth ranges are predetermined, and if the one or more upconversion bandwidth ranges are discontinuous, the signal bandwidth may not fall into any upconversion bandwidth range, and an upconversion bandwidth range where the signal bandwidth is located needs to be determined according to a predetermined policy. Such as one or more ranges of upconversion bandwidths, if contiguous, it is straightforward to determine the range of upconversion bandwidths within which the acquired signal bandwidth falls. If there is an overlap between one or more upconversion bandwidth ranges, the signal bandwidth may fall into more than one upconversion bandwidth range, and an upconversion bandwidth range where the signal bandwidth is located needs to be determined according to a preset strategy. If one or more upconversion bandwidth ranges do not overlap, one of the upconversion bandwidth ranges within which the acquired signal bandwidth falls can be directly determined.

The number of the up-conversion bandwidth ranges depends on the frequency bands available to the target area for signal coverage by the signal coverage unit, for example, when there are two available frequency bands in the target area, the up-conversion bandwidth ranges may be set to be at least two, and in the subsequent step of this embodiment, it may be determined to select one of the available frequency bands for up-conversion according to the up-conversion bandwidth range where the intermediate frequency downlink signal is located, so as to obtain a corresponding high frequency coverage signal for coverage.

S330: controlling the up-conversion of the intermediate frequency downlink signal to a high frequency coverage signal according to the up-conversion bandwidth range of the signal bandwidth;

in this step, the high-frequency overlay signal is a high-frequency downlink signal overlaid on the target area. Up-conversion refers to a process of mixing a signal having a higher frequency than an original signal. When the available frequency bands of the target area are more than two, the frequency after the up-conversion of the signal can be flexibly controlled according to the difference of the up-conversion bandwidth range where the signal bandwidth is located, the frequency of the high-frequency coverage signal obtained by the up-conversion is minimized to the maximum extent, the high-frequency coverage signal obtained by the up-conversion is ensured to be in the available frequency band of the target area, the performance requirement of the minimized high-frequency coverage signal on an execution main body, namely a signal coverage unit, is reduced, and the design difficulty is greatly reduced.

Specifically, each up-conversion bandwidth range corresponds to one frequency band, and the corresponding relationship is preset. A frequency band refers to a range of values consisting of a maximum frequency and a minimum frequency. Based on this, as shown in fig. 6, step S230 specifically includes the following steps:

s331: determining a frequency band corresponding to an up-conversion bandwidth range where a signal bandwidth is located;

each up-conversion bandwidth range corresponds to one frequency band, and the signal bandwidth of the intermediate frequency uplink signal only falls into one of the up-conversion bandwidth ranges, so that only one frequency band is determined in the step.

Specifically, when the number of available frequency bands, i.e., the up-conversion bandwidth ranges, of the target area is two or more, a positive correlation exists between the up-conversion bandwidth ranges and the corresponding frequencies, and the smaller the minimum bandwidth of the up-conversion bandwidth ranges, i.e., the smaller the value covered by the up-conversion bandwidth ranges, the smaller the minimum bandwidth/maximum bandwidth of the corresponding frequency bands, which is favorable for minimizing the frequency of the high-frequency coverage signal obtained by the up-conversion.

S332: controlling the up-conversion of the intermediate frequency downlink signal to a high frequency coverage signal according to the determined frequency band;

in this step, the determined frequency band is a frequency band in which a high-frequency coverage signal obtained by up-converting the intermediate-frequency downlink signal is located, and bandwidths of the intermediate-frequency downlink signal before up-conversion and the high-frequency coverage signal after up-conversion are not changed. Preferably, in order to suppress noise in the high-frequency coverage signal obtained by the up-conversion, after the up-conversion and before the next step is performed, the high-frequency coverage signal may be filtered, the peak-to-average power ratio may be reduced, and the pre-distortion may be performed by using a high-frequency filtering module used for filtering the high-frequency coverage signal in the signal coverage unit.

S340: covering the high-frequency covering signal to a target area;

in this step, covering generally refers to transmitting a high frequency covering signal through an antenna to a target area. Preferably, in this step, the high-frequency covering signal is covered to the target area after being power-amplified.

The embodiment provides a signal coverage method applied to a signal coverage unit, the method performs up-conversion on an intermediate frequency downlink signal transmitted by a signal access unit after receiving the intermediate frequency downlink signal, so as to obtain a high frequency coverage signal, and then covers the high frequency coverage signal to a target area, in the up-conversion process, the method determines a frequency band of the up-converted high frequency coverage signal based on a signal bandwidth of the intermediate frequency downlink signal, specifically, determines an up-conversion bandwidth range of the signal bandwidth in one or more preset up-conversion bandwidth ranges according to the signal bandwidth of the intermediate frequency downlink signal, the smaller the minimum bandwidth of the up-conversion bandwidth range, the smaller the minimum bandwidth of the corresponding frequency band, based on the relationship, the frequency band of the up-converted high frequency coverage signal can be minimized to the greatest extent, so as to ensure that the up-converted high frequency coverage signal is within an available frequency band of the target area, and the requirement on the performance of an execution main body, namely a signal covering unit, is reduced by minimizing the frequency of the high-frequency covering signal, and the design difficulty is greatly reduced.

In an embodiment, based on the same concept as the previous embodiment, the present embodiment provides a signal access unit, as shown in fig. 7, including:

a signal input interface 410 for receiving a high frequency downlink signal;

the high frequency downlink signal is coupled from a radio transceiver station, such as a base station.

After the signal input interface 410 receives the high frequency signal, in order to suppress the noise in the high frequency signal, the signal access unit further includes a high frequency filter module 460, the high frequency filter module 460 is used to filter the high frequency signal, the operating frequency of the high frequency filter module 460 should be preset according to the source type of the radio transceiver station such as the base station coupled with the signal, and the signal frequency band of the coupled high frequency signal can be preset according to the source type, and the determined signal frequency band is the preset operating frequency of the high frequency filter module 460.

A signal bandwidth detection module 420, configured to obtain a signal bandwidth of the high-frequency downlink signal;

the micro-processing module 430 is configured to determine a down-conversion bandwidth range where a signal bandwidth is located from a plurality of preset down-conversion bandwidth ranges, and determine an intermediate frequency of the high-frequency downlink signal after down-conversion according to the down-conversion bandwidth range where the signal bandwidth is located;

a plurality of down-conversion bandwidth ranges are preset, and the down-conversion bandwidth range refers to a numerical range formed by a maximum bandwidth and a minimum bandwidth. If the down-conversion bandwidth ranges are not continuous, and the signal bandwidth may not fall into any one of the down-conversion bandwidth ranges, the micro-processing module 430 needs to determine a down-conversion bandwidth range in which the signal bandwidth is located according to a preset policy. If there is continuity between several ranges of downconversion bandwidth, the range of downconversion bandwidth within which the acquired signal bandwidth falls can be determined directly. If there is an overlap between several ranges of the down-conversion bandwidth, the signal bandwidth may fall into more than one range of the down-conversion bandwidth, and the micro-processing module 430 needs to determine the range of the down-conversion bandwidth where the signal bandwidth is located according to a preset policy. If several ranges of the down-conversion bandwidth do not overlap with each other, i.e. there is no overlapping portion with each other, the micro-processing module 430 may directly determine one of the ranges of the down-conversion bandwidth within which the acquired signal bandwidth falls.

After determining one of the down-conversion bandwidth ranges where the signal bandwidth is located, the micro-processing module 430 determines the intermediate frequency of the high-frequency downlink signal after down-conversion according to the down-conversion bandwidth range. Specifically, each down-conversion bandwidth range corresponds to one center frequency, and the correspondence is preset. The central frequency refers to a frequency in the middle of the filtering passband, and also refers to a geometric mean value of the frequency band signal, when determining the intermediate frequency after the down-conversion of the high-frequency downlink signal, the micro processing module 430 specifically determines the central frequency corresponding to the down-conversion bandwidth range in which the signal bandwidth is located, and uses the determined intermediate frequency as the intermediate frequency after the down-conversion of the high-frequency downlink signal.

The positive correlation exists between the down-conversion bandwidth range and the corresponding central frequency, the smaller the minimum bandwidth of the down-conversion bandwidth range is, namely the smaller the numerical value covered by the down-conversion bandwidth range is, the lower the corresponding central frequency is, which is beneficial to minimizing the central frequency of the intermediate frequency signal obtained by down-conversion, and the central frequency is flexibly selected in the down-conversion process instead of being based on a fixed central frequency, so that the transmission loss is reduced to the maximum extent.

If the number of the preset down-conversion bandwidth ranges is too large, the operation efficiency of the step may be affected, and if the number of the preset down-conversion bandwidth ranges is too small, the environmental adaptability of the signal access unit and the effect of reducing transmission loss may be affected.

The number of the down-conversion bandwidth ranges is moderate, the bandwidth of the existing general communication signal is considered in the preset 4 down-conversion bandwidth ranges, the communication signals of various information source types can relatively and uniformly fall into the 4 down-conversion bandwidth ranges, and the signal access unit is suitable for the communication signals of various information source types and has strong environmental adaptability.

A frequency conversion module 440, configured to control a down-conversion of the high-frequency downlink signal to an intermediate-frequency downlink signal according to the determined intermediate-frequency;

down-conversion refers to a process of mixing a frequency of a mixed signal to be lower than a frequency of an original signal. The bandwidths of the high-frequency downlink signal before down-conversion and the intermediate-frequency downlink signal after down-conversion are not changed, and after the central frequency of the intermediate-frequency downlink signal is determined, the frequency band of the intermediate-frequency downlink signal can also be determined. Because there are several down-conversion bandwidth ranges, and the signal bandwidth falls into only one of the down-conversion bandwidth ranges, the frequency conversion module 440 can flexibly control the down-conversion process of the signal according to the difference of the down-conversion bandwidth range in which the signal bandwidth is located, and minimize the frequency of the intermediate frequency downlink signal obtained by down-conversion to the greatest extent, so that it can reduce the transmission loss to the greatest extent during the subsequent transmission.

Preferably, in order to suppress noise in the intermediate frequency downlink signal obtained by the down-conversion, the signal access unit further includes an intermediate frequency filter module 470, after the down-conversion, the intermediate frequency filter module 470 is configured to filter the intermediate frequency downlink signal, and in the intermediate frequency filter module 470 configured to filter the intermediate frequency downlink signal, an intermediate frequency filter having a center frequency that is the determined center frequency should be selected for filtering.

A signal output interface 450, configured to transmit the intermediate frequency downlink signal;

the transmission of the intermediate frequency downlink signal refers to transmitting the signal to a next-stage unit, that is, a part of the signal coverage equipment directly used for signal coverage, which is generally referred to as a signal coverage unit in the signal coverage equipment. Preferably, the signal access unit further includes an uplink/downlink switching module 480, the uplink/downlink switching module 480 is configured to switch an uplink and a downlink of the signal access unit, and the uplink/downlink switching module 480 includes a downlink intermediate frequency amplification module 481 configured to perform power amplification on the intermediate frequency downlink signal. The signal transmission interface 450 transmits the power-amplified intermediate frequency downlink signal. The transmission is generally carried out by means of radio frequency wires or optical fibers, and preferably by means of radio frequency wires.

Specifically, the signal access unit further includes a signal sampling module 491 and a synchronization module 492, the signal sampling module 491 is used for completing sampling of the signal processed in the signal access unit and transmitting the signal to the synchronization module 492, and the synchronization module 492 generates a synchronization signal according to the sampled signal configuration and transmits the synchronization signal to the next stage unit, i.e. the signal overlay unit.

Since this embodiment is based on the same concept as the foregoing embodiment, the beneficial effects brought by this embodiment can be referred to the beneficial effects in the foregoing embodiment, and are not described herein again.

In one embodiment, based on the same concept as the previous embodiment, the present embodiment provides a signal covering unit, as shown in fig. 8, including:

a signal transmission interface 510, configured to receive an intermediate frequency downlink signal;

the intermediate frequency downlink signal is received from the signal access unit. Specifically, the intermediate frequency downlink signal is input to the uplink and downlink switching module 550 of the signal covering unit through the signal input interface 510, and the uplink and downlink switching module 550 is configured to switch the uplink and downlink of the signal covering unit and output the intermediate frequency downlink signal to the radio frequency transceiver module 520.

A radio frequency transceiver module 520, configured to obtain a signal bandwidth of the intermediate frequency downlink signal;

the signal bandwidth refers to the difference between the highest frequency and the lowest frequency of the harmonics contained in a signal, i.e., the frequency range possessed by the signal. Preferably, in order to suppress noise in the intermediate frequency downlink signal, the rf transceiver module 520 further includes an intermediate frequency filtering module for performing preliminary filtering on the intermediate frequency downlink signal.

The synchronization and control module 530 determines an up-conversion bandwidth range in which the acquired signal bandwidth is located from one or more preset up-conversion bandwidth ranges, and determines a frequency band of the intermediate-frequency downlink signal after up-conversion according to the up-conversion bandwidth range in which the signal bandwidth is located;

specifically, if one or more of the up-conversion bandwidth ranges are predetermined, and if one or more of the up-conversion bandwidth ranges are discontinuous, the signal bandwidth may not fall into any of the up-conversion bandwidth ranges, the synchronization and control module 530 needs to determine the up-conversion bandwidth range in which the signal bandwidth is located according to a predetermined policy. If there is continuity between the upconversion bandwidth ranges, the synchronization and control module 530 may directly determine the upconversion bandwidth range within which the acquired signal bandwidth falls. If there is overlap between the up-conversion bandwidth ranges, the signal bandwidth may fall into more than one up-conversion bandwidth range, and the synchronization and control module 530 needs to determine the up-conversion bandwidth range where the signal bandwidth is located according to a preset strategy. If the up-conversion bandwidth ranges do not overlap, the synchronization and control module 530 may directly determine one of the up-conversion bandwidth ranges within which the acquired signal bandwidth falls.

The number of the up-conversion bandwidth ranges depends on the frequency bands available to the signal coverage unit in the target area for signal coverage, for example, when there are two frequency bands available to the target area, the up-conversion bandwidth ranges may be set to at least two.

Specifically, each up-conversion bandwidth range corresponds to one frequency band, and the corresponding relationship is preset. The frequency band is a numerical range formed by a maximum frequency and a minimum frequency, and when the synchronization and control module 530 determines the frequency band according to the signal bandwidth, specifically, the frequency band corresponding to the up-conversion bandwidth range where the signal bandwidth is located is determined, and the determined frequency band is used as the frequency band after the up-conversion of the intermediate-frequency downlink signal.

Each up-conversion bandwidth range corresponds to one frequency band, and if the signal bandwidth of the intermediate frequency uplink signal only falls into one of the up-conversion bandwidth ranges, only one frequency band determined by the synchronization and control module 530 is provided.

When the number of available frequency bands, i.e., up-conversion bandwidth ranges, of the target area is more than two, a positive correlation exists between the up-conversion bandwidth ranges and the corresponding frequencies, and the smaller the minimum bandwidth of the up-conversion bandwidth ranges, i.e., the smaller the numerical value covered by the up-conversion bandwidth ranges, the smaller the minimum bandwidth/maximum bandwidth of the corresponding frequency bands, which is favorable for minimizing the frequency of the high-frequency coverage signal obtained by up-conversion.

The rf transceiver module 520 is further configured to control the intermediate frequency downlink signal to be up-converted to the high frequency coverage signal according to the determined frequency band;

the determined frequency band corresponds to a frequency band corresponding to an up-conversion bandwidth range where the signal bandwidth is located, and the bandwidths of the intermediate-frequency down signal before up-conversion and the high-frequency covering signal after up-conversion are not changed. The high frequency cover signal is a high frequency downlink signal that covers up to the target area. Up-conversion refers to a process of mixing a signal having a higher frequency than an original signal. When the available frequency bands of the target area are more than two, the frequency after the up-conversion of the signal can be flexibly controlled according to the difference of the up-conversion bandwidth range where the signal bandwidth is located, the frequency of the high-frequency coverage signal obtained by the up-conversion is minimized to the maximum extent, the high-frequency coverage signal obtained by the up-conversion is ensured to be in the available frequency band of the target area, the performance requirement of the minimized high-frequency coverage signal on an execution main body, namely a signal coverage unit, is reduced, and the design difficulty is greatly reduced.

Preferably, in order to suppress noise in the high-frequency coverage signal obtained by the up-conversion, the rf transceiver module 520 includes a filter module for performing operations such as filtering, peak-to-average power ratio reduction, and pre-distortion on the high-frequency coverage signal obtained by the up-conversion, and an operating frequency band of the filter module for filtering the high-frequency coverage signal should be preset, where the operating frequency band is the determined frequency band.

A signal overlay interface 540 for overlaying the high frequency overlay signal to the target area;

coverage generally refers to transmitting a high frequency coverage signal through an antenna to a target area. Preferably, the signal covering unit further includes a downlink signal amplifying module 560 and a high-frequency filtering module 570, where the downlink signal amplifying module 560 is configured to perform power amplification on the high-frequency covering signal obtained after the up-conversion, and the high-frequency filtering module 570 filters the high-frequency covering signal, and the high-frequency covering signal after the amplification and the filtering is covered by the signal covering interface 540.

The synchronization and control module 530 of the signal overlay unit is also used for receiving and synchronizing the synchronization signal sent by the signal access unit. The signal access unit further includes a signal sampling module 580 for sampling the signal processed in the signal coverage unit and transmitting the signal to the synchronization and control module 530, and the synchronization and control module 530 generates a synchronization signal according to the sampled signal configuration and transmits the synchronization signal to the next stage unit, i.e., the signal access unit.

In one embodiment, based on the same concept as the previous embodiment, the present embodiment provides a signal covering unit, as shown in fig. 9, including:

a signal overlay interface 610 for receiving a high frequency uplink signal;

the signal is received from a terminal in the target area. The uplink signal is a signal transmitted from a mobile terminal to a radio transceiver station such as a base station, and belongs to a signal transmitted in an uplink. Preferably, in order to suppress noise in the high-frequency uplink signal, the signal covering unit further includes a high-frequency filtering module 650 for filtering the high-frequency uplink signal, and an operating frequency of the high-frequency filtering module 650 is preset according to one of available signal frequency bands of the target area, where the available signal frequency band is the preset operating frequency band of the high-frequency filtering module 650. Preferably, the signal covering unit further includes an uplink intermediate frequency low noise amplification module 660, configured to perform low noise amplification on the high frequency uplink signal, and output the processed signal to the radio frequency transceiver module 620.

A radio frequency transceiver module 620, configured to acquire a signal bandwidth of the high-frequency uplink signal;

the signal bandwidth refers to the difference between the highest frequency and the lowest frequency of the harmonics contained in a signal, i.e., the frequency range possessed by the signal.

The synchronization and control module 630 is configured to determine a downconversion bandwidth range where the acquired signal bandwidth is located from a plurality of preset downconversion bandwidth ranges, and determine an intermediate frequency of the high-frequency uplink signal after downconversion according to the downconversion bandwidth range where the signal bandwidth is located;

a plurality of down-conversion bandwidth ranges are preset, and the down-conversion bandwidth range refers to a numerical range formed by a maximum bandwidth and a minimum bandwidth. If the down-conversion bandwidth ranges are not continuous, and the signal bandwidth may not fall into any one of the down-conversion bandwidth ranges, the synchronization and control module 630 needs to determine the down-conversion bandwidth range in which the signal bandwidth is located according to a predetermined policy. The synchronization and control module 630 may directly determine the range of downconversion bandwidths within which the acquired signal bandwidth falls, as this is continuous between the ranges of downconversion bandwidths. If there is an overlap between the lower frequency conversion bandwidth ranges, the signal bandwidth may fall into more than one lower frequency conversion bandwidth range, and the synchronization and control module 630 needs to determine the lower frequency conversion bandwidth range where the signal bandwidth is located according to a preset policy. The synchronization and control module 630 may directly determine one of the downconversion bandwidth ranges within which the acquired signal bandwidth falls if the downconversion bandwidth ranges do not overlap with each other.

Specifically, each down-conversion bandwidth range corresponds to one center frequency, and the correspondence is preset. The center frequency refers to the frequency in the middle of the filter passband and also to the geometric mean of the frequencies of the band signals. Based on this, when the synchronization and control module 630 determines the intermediate frequency of the high-frequency uplink signal after the down-conversion according to the signal bandwidth, specifically, the center frequency corresponding to the down-conversion bandwidth range where the signal bandwidth is located is determined, and the center frequency is used as the intermediate frequency of the high-frequency uplink signal after the down-conversion.

The number of the down-conversion bandwidth ranges is moderate, the bandwidth of the existing general communication signal is considered in the preset 4 down-conversion bandwidth ranges, the communication signals of various information source types can relatively and uniformly fall into the 4 down-conversion bandwidth ranges, the signal covering unit is suitable for the communication signals of various information source types, and the environmental adaptability is high.

The radio frequency transceiver module 620 is further configured to control the down-conversion of the high-frequency uplink signal to the intermediate-frequency uplink signal according to the determined intermediate-frequency;

the determined intermediate frequency corresponds to a center frequency corresponding to an up-conversion bandwidth range where the signal bandwidth is located, and the bandwidths of the high-frequency uplink signal before down-conversion and the intermediate-frequency uplink signal after down-conversion are not changed. Down-conversion refers to a process of mixing a frequency of a mixed signal to be lower than a frequency of an original signal. Since there are several down-conversion bandwidth ranges, and the signal bandwidth only falls into one of the down-conversion bandwidth ranges, the rf transceiver module 620 may flexibly control the down-conversion process of the signal according to the determined difference of the intermediate frequency, and minimize the frequency of the intermediate frequency uplink signal obtained by down-conversion to the maximum extent, so that the loss of transmission can be reduced to the maximum extent when the signal is transmitted in the subsequent steps of this embodiment.

Preferably, in order to suppress noise in the intermediate frequency uplink signal obtained by the down-conversion, the rf transceiver module 620 includes an intermediate frequency filter module for filtering the intermediate frequency uplink signal after the down-conversion, and an intermediate frequency filter having a center frequency determined by the determined center frequency should be selected in the intermediate frequency filter module for filtering the intermediate frequency uplink signal.

And the signal transmission interface 640 outputs the intermediate-frequency uplink signal.

The output of the intermediate frequency uplink signal refers to the signal transmission to the next unit in the uplink, that is, the signal interaction part with the radio transceiver station such as the base station in the signal coverage equipment, and this part generally refers to the signal access unit in the signal coverage equipment. Preferably, the signal covering unit further includes an uplink signal amplifying module 670, configured to perform power amplification on the intermediate frequency uplink signal and then transmit the intermediate frequency uplink signal. Specifically, the signal covering unit further includes an uplink and downlink switching module 680, after the intermediate frequency uplink signal is filtered, the intermediate frequency uplink signal is input to the uplink and downlink switching module 680 of the signal covering unit, the uplink and downlink switching module 680 is used for switching an uplink and a downlink of the signal covering unit, and the intermediate frequency downlink signal is output through the signal transmission interface 640 after passing through the uplink and downlink switching module 680. The signal transmission module 640 generally transmits signals through radio frequency wires or optical fibers, and preferably transmits signals through radio frequency wires.

Preferably, the synchronization and control module 630 of the signal overlay unit is further configured to receive and synchronize with the synchronization signal sent by the signal access unit. The signal overlay unit further includes a signal sampling module 690 for sampling the signal processed in the signal overlay unit and transmitting the sampled signal to the synchronization and control module 630, and the synchronization and control module 630 generates a synchronization signal according to the sampled signal configuration and transmits the synchronization signal to the next stage unit, i.e., the signal access unit.

After receiving the intermediate frequency uplink signal transmitted by the signal covering unit, the signal access unit performs intermediate frequency filtering on the intermediate frequency uplink signal, performs up-conversion on the intermediate frequency uplink signal to a high frequency uplink signal, and performs filtering on the high frequency uplink signal and then transmits the high frequency uplink signal back to a base station and other wireless transceiver stations.

In an embodiment, based on the same concept as that of the previous embodiment, as shown in fig. 10, this embodiment provides a signal coverage device, which includes a signal access end and a signal coverage end, where the signal access end includes a plurality of groups of radio frequency lines and a plurality of groups of signal access units, the signal coverage end includes a plurality of groups of antennas and a plurality of groups of signal coverage units, the signal access end further includes an access end main control module, and the signal coverage end further includes a coverage end main control module.

Each signal access unit comprises a high-frequency filtering module, a medium-frequency filtering module, a downlink amplifying module, an uplink and downlink switching module, a signal bandwidth detecting module, a frequency conversion module, a microprocessor, a signal sampling module and a synchronization module.

Each signal covering unit comprises a high-frequency filtering module, a medium-frequency filtering module, a downlink amplifying module, an uplink and downlink switching module, a synchronizing and controlling module, a radio frequency transceiving module and a signal sampling module.

When the signal access end and the signal coverage end are electrified and initialized, the frequency of signal interaction with the base station is known by the access end main control module according to the information source type of the base station and is in the frequency band of 4.8GHz-4.9GHz, so that the working frequency of the high-frequency filtering module of each signal access unit can be preset to be 4.8GHz-4.9GHz, and the uplink signal output frequency of each signal access unit is 4.8GHz-4.9 GHz.

The coverage end main control module can know the signal coverage requirement of the target area, the available frequency ranges of the target area are 1880 MHz-1920 MHz and 2515MHz-2615MHz, and the up-conversion radio frequency of the radio frequency transceiver module of the signal coverage unit is 2515MHz-2615MHz in advance.

The following describes uplink and downlink signal transmission of one signal access unit and a corresponding signal coverage unit:

the signal access unit couples a high-frequency downlink signal with the frequency of 4.8GHz-4.9GHz from a base station, after a high-frequency filtering module of the signal access unit filters the high-frequency downlink signal, a signal bandwidth detection module in the signal access unit detects that the signal bandwidth of the high-frequency downlink signal is 100MHz, and a microprocessor in the signal access unit automatically sets a frequency conversion module of the signal access unit according to the signal bandwidth read by the signal bandwidth detection module, so that the frequency conversion module down-converts the high-frequency downlink signal to an intermediate-frequency downlink signal according to the setting.

Specifically, the microprocessor sets the frequency conversion module according to the signal bandwidth in the following process:

determining a down-conversion bandwidth range to which the bandwidth of the high-frequency downlink signal belongs, wherein four down-conversion bandwidth ranges are preset:

the first down-conversion bandwidth range is more than 0MHz and less than or equal to 20MHz, and the corresponding center frequency is 20 MHz;

the second down-conversion bandwidth range is greater than 20MHz and less than or equal to 50MHz, the corresponding center frequency is a second frequency, and the second frequency is preferably 50 MHz;

the third down-conversion bandwidth range is more than 50MHz and less than or equal to 100MHz, and the corresponding center frequency is 100 MHz;

the fourth down-conversion bandwidth range is preset to be larger than 100MHz, the corresponding center frequency is (BW/2+50) MHz, and BW is the acquired signal bandwidth.

The bandwidth of the high-frequency downlink signal is 100MHz, and the corresponding center frequency is 100MHz in the third down-conversion bandwidth range, so that the microprocessor automatically sets the frequency conversion module to output the intermediate-frequency downlink signal with the downlink intermediate-frequency center frequency of 100MHz, that is, down-convert the high-frequency downlink signal to the intermediate-frequency downlink signal with the intermediate-frequency center frequency of 100 MHz. The microprocessor sets a filter with the center frequency of 100MHz in the intermediate frequency filter module of the selection signal access unit as a working filter.

The intermediate frequency filtering module in the signal access unit carries out intermediate frequency filtering on intermediate frequency downlink signals, the downlink amplifying module carries out power amplification on the signals, and the signals are transmitted to the signal covering unit through the radio frequency line. And a signal sampling module in the signal access unit is matched with the synchronization module to generate a synchronization signal, and the synchronization signal is transmitted to the corresponding signal covering unit.

The signal covering unit receives the intermediate frequency downlink signal from the signal access unit, and a radio frequency transceiver module in the signal covering unit detects that the bandwidth of the intermediate frequency downlink signal is 100MHz and the center frequency is 100 MHz.

The synchronization and control module of the signal covering unit determines the up-conversion bandwidth range to which the intermediate frequency downlink signal belongs according to the detected signal bandwidth of the intermediate frequency downlink signal, and because there are two available frequency bands in the target area, which are 1880MHz to 1920MHz and 2515MHz to 2615MHz, two are preset in the up-conversion bandwidth range:

the first up-conversion bandwidth range is preset to be more than 0MHz and less than or equal to 40MHz, and the corresponding frequency band is 1880 MHz-1920 MHz;

the second up-conversion bandwidth range is preset to be more than 40MHz and less than or equal to 100MHz, and the corresponding frequency band is 2515MHz-2615 MHz.

The bandwidth of the intermediate frequency downlink signal is 100MHz, in the second up-conversion bandwidth range, the corresponding frequency band is 2515MHz-2615MHz, therefore, the synchronization and control module determines that the frequency band after up-conversion of the intermediate frequency downlink signal is 2515MHz-2615MHz, and transmits the control signal to the radio frequency transceiver module, the radio frequency transceiver module up-converts the intermediate frequency downlink signal to a high-frequency covering signal of 2515MHz-2615MHz, and performs primary filtering, peak-to-average power ratio reduction, predistortion and other operations on the high-frequency covering signal, then the high-frequency filtering module in the signal covering unit performs filtering, the downlink amplifying module in the signal covering unit performs power amplification, and finally the high-frequency covering signal is transmitted to a target area through an antenna, so that a terminal in the target area can receive and process the high-frequency downlink signal transmitted from the signal covering unit. In the process of processing signals by the signal covering unit, the synchronization and control module of the signal covering unit also receives and synchronizes with the synchronization signal sent by the signal access unit.

The terminal of the target area transmits the local information to the signal covering unit in the form of a high-frequency uplink signal with the frequency of 2515MHz-2615MHz according to the information interaction condition, the signal covering unit receives the high-frequency uplink signal from the terminal through an antenna, performs low-noise amplification on the high-frequency uplink signal by using an uplink amplification module of the signal covering unit, and performs filtering and the like on the high-frequency uplink signal by using a high-frequency filtering module of the signal covering unit.

The radio frequency transceiver module of the signal covering unit detects that the signal bandwidth of the high-frequency uplink signal is 100MHz, the synchronization and control module of the signal covering unit reads the signal bandwidth in the radio frequency transceiver module, determines the intermediate frequency of the high-frequency uplink signal after down-conversion according to the signal bandwidth, and automatically sets the radio frequency transceiver module to perform down-conversion on the high-frequency uplink signal.

Specifically, the setting process of the synchronization and control module to the radio frequency transceiver module according to the signal bandwidth is as follows:

determining a down-conversion bandwidth range to which the bandwidth of the high-frequency uplink signal belongs, wherein four down-conversion bandwidth ranges are preset:

The bandwidth of the high-frequency uplink signal is 100MHz, and the corresponding center frequency is 100MHz in the third down-conversion bandwidth range, so that the synchronization and control module automatically sets the radio frequency transceiver module to output the intermediate-frequency uplink signal with the downlink intermediate-frequency center frequency of 100MHz, that is, the high-frequency uplink signal is down-converted to the intermediate-frequency uplink signal with the intermediate-frequency center frequency of 100 MHz. And the synchronization and control module simultaneously sets a filter with the central frequency of 100MHz in the intermediate frequency filtering module of the selection signal covering unit as a working filter.

And an uplink amplification module in the signal covering unit performs power amplification on the intermediate frequency uplink signal and transmits the intermediate frequency uplink signal to the signal access unit through an uplink and downlink selector switch and a radio frequency line of the signal covering unit.

The signal access unit receives the intermediate frequency uplink signal, filters the intermediate frequency signal by using the own intermediate frequency filtering module, up-converts the intermediate frequency uplink signal to a radio frequency signal with the frequency of 4.8G-4.9GHz by using the own frequency conversion module, and transmits the radio frequency signal back to the base station after being filtered by the own high frequency filtering module.

In an embodiment, based on the same concept as that of the previous embodiment, as shown in fig. 11, the present embodiment provides a signal covering device, which includes a signal incoming end and a signal covering end, wherein the signal incoming end includes at least two sets of radio frequency lines, two sets of signal incoming units, and an incoming end main control module, and the signal covering end includes at least two sets of antennas, two sets of signal covering units, and a covering end main control module.

The first signal access unit comprises a first high-frequency filtering module, a first intermediate-frequency filtering module, a first downlink amplifying module, a first uplink and downlink switching module, a first signal bandwidth detecting module, a first frequency conversion module, a first microprocessor, a first signal sampling module and a first synchronization module.

The second signal access unit comprises a second high-frequency filtering module, a second intermediate-frequency filtering module, a second downlink amplifying module, a second uplink and downlink switching module, a second signal bandwidth detecting module, a second frequency conversion module, a second microprocessor, a second signal sampling module and a second synchronization module.

The first signal covering unit comprises a third high-frequency filtering module, a third intermediate-frequency filtering module, a third downlink amplifying module, a third uplink and downlink switching module, a first synchronization and control module, a first radio frequency transceiving module and a third signal sampling module.

The second signal covering unit comprises a fourth high-frequency filtering module, a fourth intermediate-frequency filtering module, a fourth downlink amplifying module, a fourth uplink and downlink switching module, a second synchronization and control module, a second radio frequency transceiving module and a fourth signal sampling module.

When the signal access end and the signal coverage end are electrified and initialized, the access end main control module can know the frequency band of 4.8GHz-4.9GHz of the signal frequency of the first signal access unit which performs signal interaction with the base station according to the information source type of the base station, so that the working frequency of the high-frequency filtering module of the first signal access unit can be preset to be 4.8GHz-4.9GHz, and the uplink signal output frequency of the first signal access unit is 4.8GHz-4.9 GHz. The access end main control module can know the signal frequency of the first signal access unit performing signal interaction with the base station in the frequency band of 3.4GHz-3.6GHz according to the information source type of the base station, so that the working frequency of the high-frequency filtering module of the first signal access unit can be preset to be 3.4GHz-3.6GHz, and the uplink signal output frequency of the first signal access unit is 3.4GHz-3.6 GHz.

The coverage end main control module can know the signal coverage requirement of the target area, the available frequency ranges of the first target area corresponding to the first signal coverage unit are 1880 MHz-1920 MHz and 2515MHz-2615MHz, and the up-conversion radio frequency of the radio frequency transceiver module of the first signal coverage unit is 2515MHz-2615MHz in advance. The coverage end main control module can know that the available frequency band of the second target area corresponding to the second signal coverage unit is only 3.4GHz-3.6GHz according to the signal coverage requirement of the target area, and the up-conversion radio frequency of the radio frequency transceiver module of the second signal coverage unit is preset to be 3.4GHz-3.6 GHz.

The first signal access unit is used for coupling a high-frequency downlink signal with the frequency of 4.8GHz-4.9GHz from a base station, after the first high-frequency filtering module filters the high-frequency downlink signal, the first signal bandwidth detection module detects that the signal bandwidth of the high-frequency downlink signal is 100MHz, and the first microprocessor automatically sets the first frequency conversion module according to the signal bandwidth read by the first signal bandwidth detection module, so that the first frequency conversion module down-converts the high-frequency downlink signal to an intermediate-frequency downlink signal according to the setting.

Specifically, the setting process of the first frequency conversion module by the first microprocessor according to the signal bandwidth is as follows:

The bandwidth of the high-frequency downlink signal is 100MHz, and the corresponding center frequency is 100MHz in the third down-conversion bandwidth range, so that the first microprocessor automatically sets the first frequency conversion module to output the intermediate-frequency downlink signal with the downlink intermediate-frequency center frequency of 100MHz, that is, down-convert the high-frequency downlink signal to the intermediate-frequency downlink signal with the intermediate-frequency center frequency of 100 MHz. The first microprocessor also sets and selects a filter with the center frequency of 100MHz in the first intermediate frequency filtering module as a working filter.

The first intermediate frequency filtering module performs intermediate frequency filtering on the intermediate frequency downlink signal, the first downlink amplifying module performs power amplification on the signal, and the signal is transmitted to the first signal covering unit through a group of radio frequency lines. The first signal sampling module and the first synchronization module are matched to generate a synchronization signal and transmit the synchronization signal to the corresponding first signal covering unit.

Similarly, the second signal access unit couples the high-frequency downlink signal with the frequency of 3.4GHz-3.6GHz from the base station, after the second high-frequency filtering module filters the high-frequency downlink signal, the second signal bandwidth detection module detects that the signal bandwidth of the high-frequency downlink signal is 200MHz, and the second microprocessor automatically sets the second frequency conversion module according to the signal bandwidth read by the second signal bandwidth detection module, so that the second frequency conversion module down-converts the high-frequency downlink signal to the intermediate-frequency downlink signal according to the setting.

The bandwidth of the high-frequency downlink signal is 200MHz, and the corresponding center frequency is 150MHz in the fourth down-conversion bandwidth range, so that the second microprocessor automatically sets the second frequency conversion module to output the intermediate-frequency downlink signal with the downlink intermediate-frequency center frequency of 150MHz, that is, down-convert the high-frequency downlink signal to the intermediate-frequency downlink signal with the intermediate-frequency center frequency of 150 MHz. The second microprocessor also sets and selects a filter with the center frequency of 150MHz in the second intermediate frequency filtering module as a working filter.

The second intermediate frequency filtering module performs intermediate frequency filtering on the intermediate frequency downlink signal, the second downlink amplifying module performs power amplification on the signal, and the signal is transmitted to the second signal covering unit through a group of radio frequency lines. The second signal sampling module and the second synchronization module are matched to generate a synchronization signal and transmit the synchronization signal to the corresponding second signal covering unit.

The first signal covering unit receives the intermediate frequency downlink signal from the first signal access unit through a group of radio frequency lines, and the first radio frequency transceiver module detects that the bandwidth of the intermediate frequency downlink signal is 100MHz and the center frequency is 100 MHz.

The first synchronization and control module determines an up-conversion bandwidth range to which the intermediate frequency downlink signal belongs according to the detected signal bandwidth of the intermediate frequency downlink signal, and because there are two available frequency bands in the target area, which are 1880MHz to 1920MHz and 2515MHz to 2615MHz, two up-conversion bandwidth ranges are preset:

The bandwidth of the intermediate frequency downlink signal is 100MHz, in the second up-conversion bandwidth range, the corresponding frequency band is 2515MHz-2615MHz, therefore, the first synchronization and control module determines that the frequency band after up-conversion of the intermediate frequency downlink signal is 2515MHz-2615MHz, and transmits the control signal to the first radio frequency transceiver module, the first radio frequency transceiver module up-converts the intermediate frequency downlink signal to a high-frequency coverage signal of 2515MHz-2615MHz, and performs primary filtering, peak-to-average power ratio reduction, pre-distortion and other operations on the high-frequency coverage signal, then the high-frequency coverage signal is filtered by the third high-frequency filter module, power amplification is performed by the third down amplification module, and finally the high-frequency coverage signal is transmitted to the first target area through a group of antennas, so that the terminal in the first target area can receive and process the high-frequency downlink signal transmitted from the first signal coverage unit. In the process of processing signals by the first signal covering unit, the first synchronization and control module also receives and synchronizes with the synchronization signal sent by the first signal access unit.

Similarly, the second signal covering unit receives the intermediate frequency downlink signal from the second signal access unit through another group of radio frequency lines, and the second radio frequency transceiver module detects that the bandwidth of the intermediate frequency downlink signal is 200MHz and the center frequency is 150 MHz.

The second synchronization and control module determines the up-conversion bandwidth range to which the intermediate frequency downlink signal belongs according to the detected signal bandwidth of the intermediate frequency downlink signal, because only one available frequency band of the target area is available, the frequency band corresponding to the intermediate frequency downlink signal is 3.4GHz-3.6GHz, therefore, the second synchronization and control module determines that the frequency band of the intermediate frequency downlink signal after up-conversion is 3.4GHz-3.6GHz, and transmits the control signal to a second radio frequency transceiver module, the second radio frequency transceiver module up-converts the intermediate frequency downlink signal to a high frequency covering signal of 3.4GHz-3.6GHz, and performs primary filtering and reduces the peak-to-average power ratio, pre-distortion, filtering by a fourth high-frequency filtering module, amplifying by a fourth downlink amplifying module, and transmitting to a second target area via another antenna, the terminal of the target area may receive and process the high frequency downlink signal transmitted from the second signal coverage unit. In the process of processing the signal by the second signal covering unit, the second synchronization and control module also receives the synchronization signal sent by the second signal access unit and synchronizes with the synchronization signal.

The terminal of the first target area transmits local information to the first signal covering unit in the form of a high-frequency uplink signal with the frequency of 2515MHz-2615MHz according to the information interaction condition, the first signal covering unit receives the high-frequency uplink signal from the terminal through a group of antennas, low-noise amplification is carried out on the high-frequency uplink signal through the third uplink amplification module, and filtering and the like are carried out on the high-frequency uplink signal through the third high-frequency filtering module.

The first radio frequency transceiver module detects that the signal bandwidth of the high-frequency uplink signal is 100MHz, the first synchronization and control module reads the signal bandwidth in the first radio frequency transceiver module, determines the intermediate frequency of the high-frequency uplink signal after down-conversion according to the signal bandwidth, and automatically sets the first radio frequency transceiver module to perform down-conversion on the high-frequency uplink signal.

Specifically, the setting process of the first synchronization and control module on the first radio frequency transceiver module according to the signal bandwidth is as follows:

The bandwidth of the high-frequency uplink signal is 100MHz, and the corresponding center frequency is 100MHz in the third down-conversion bandwidth range, so the first synchronization and control module automatically sets the first radio frequency transceiver module to output the intermediate-frequency uplink signal with the downlink intermediate-frequency center frequency of 100MHz, that is, the high-frequency uplink signal is down-converted to the intermediate-frequency uplink signal with the intermediate-frequency center frequency of 100 MHz. The first synchronization and control module simultaneously sets and selects a filter with the center frequency of 100MHz in the third frequency filtering module as a working filter.

The third uplink amplification module is used for performing power amplification on the intermediate frequency uplink signal and transmitting the intermediate frequency uplink signal to the first signal access unit through the third uplink and downlink selector switch and the radio frequency line.

The first signal access unit receives the intermediate frequency uplink signal, filters the intermediate frequency signal by using a first intermediate frequency filtering module, up-converts the intermediate frequency uplink signal to a radio frequency signal with the frequency of 4.8GHz-4.9GHz by using a first frequency conversion module, and returns the radio frequency signal to the base station after being filtered by the first high frequency filtering module.

Similarly, the terminal in the second target area transmits the local information to the second signal covering unit in the form of a high-frequency uplink signal with the frequency of 3.4GHz-3.6GHz according to the information interaction condition, the second signal covering unit receives the high-frequency uplink signal from the terminal through another group of antennas, performs low-noise amplification on the high-frequency uplink signal by using the fourth uplink amplification module, and performs filtering and the like on the high-frequency uplink signal by using the fourth high-frequency filtering module.

The second radio frequency transceiver module detects that the signal bandwidth of the high-frequency uplink signal is 200MHz, the second synchronization and control module reads the signal bandwidth in the second radio frequency transceiver module, determines the intermediate frequency of the high-frequency uplink signal after down-conversion according to the signal bandwidth, and automatically sets the second radio frequency transceiver module to perform down-conversion on the high-frequency uplink signal.

The bandwidth of the high-frequency uplink signal is 200MHz, and the corresponding center frequency is 150MHz in the fourth down-conversion bandwidth range, so the second synchronization and control module automatically sets the second radio frequency transceiver module to output the intermediate-frequency uplink signal with the downlink intermediate-frequency center frequency of 150MHz, that is, the high-frequency uplink signal is down-converted to the intermediate-frequency uplink signal with the intermediate-frequency center frequency of 150 MHz. The second synchronization and control module simultaneously sets and selects a filter with the center frequency of 150MHz in the fourth frequency filtering module as a working filter.

The fourth uplink amplification module is used for performing power amplification on the intermediate frequency uplink signal and transmitting the intermediate frequency uplink signal to the second signal access unit through the fourth uplink and downlink selector switch and the radio frequency line.

The second signal access unit receives the intermediate frequency uplink signal, filters the intermediate frequency signal by using a second intermediate frequency filtering module, up-converts the intermediate frequency uplink signal to a radio frequency signal with the frequency of 3.4GHz-3.6GHz by using a second frequency conversion module, and returns the radio frequency signal to the base station after being filtered by the second high frequency filtering module.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.

Claims

1. A signal transmission method is applied to a signal access unit or a signal coverage unit, and is characterized by comprising the following steps:

the method comprises the steps of receiving a high-frequency signal, obtaining the signal bandwidth of the high-frequency signal, determining a down-conversion bandwidth range where the signal bandwidth is located from a plurality of preset down-conversion bandwidth ranges, controlling the down-conversion of the high-frequency signal to an intermediate-frequency signal according to the down-conversion bandwidth range where the signal bandwidth is located, and transmitting the intermediate-frequency signal.

2. The signal transmission method according to claim 1,

each down-conversion bandwidth range corresponds to a center frequency;

controlling the down-conversion of the high-frequency downlink signal to the intermediate-frequency downlink signal according to the down-conversion bandwidth range where the signal bandwidth is located, specifically: and determining the central frequency corresponding to the down-conversion bandwidth range in which the signal bandwidth is positioned, and controlling the down-conversion of the high-frequency downlink signal to the intermediate-frequency downlink signal according to the determined central frequency.

3. The signal transmission method according to claim 2, wherein the smaller the minimum bandwidth of the down-conversion bandwidth range, the lower the corresponding center frequency.

4. The signal transmission method according to claim 3, wherein the predetermined number of down-conversion bandwidth ranges is at least four, and includes a first down-conversion bandwidth range, a second down-conversion bandwidth range, a third down-conversion bandwidth range and a fourth down-conversion bandwidth range.

5. The signal transmission method according to claim 4,

the first down-conversion bandwidth range is less than or equal to 20MHz, and the corresponding center frequency is a first frequency;

the second down-conversion bandwidth range is greater than 20MHz and less than or equal to 50MHz, and the corresponding center frequency is a second frequency;

the third down-conversion bandwidth range is more than 50MHz and less than or equal to 100MHz, and the corresponding center frequency is a third frequency;

the fourth down-conversion bandwidth range is more than 100MHz, and the corresponding center frequency is a fourth frequency;

the first frequency is less than the second frequency, the second frequency is less than the third frequency, and the third frequency is less than the fourth frequency.

6. The signal transmission method according to claim 5, wherein the first frequency is 20 MHz; the second frequency is 50 MHz; the third frequency is 100 MHz; the fourth frequency is a sum of one half of the value of the signal bandwidth and 50 MHz.

7. A signal covering method is applied to a signal covering unit and is characterized by comprising the following steps:

receiving an intermediate frequency downlink signal, acquiring a signal bandwidth of the intermediate frequency downlink signal, determining an up-conversion bandwidth range where the signal bandwidth is located from one or more preset up-conversion bandwidth ranges, controlling the intermediate frequency downlink signal to be up-converted to a high frequency coverage signal according to the up-conversion bandwidth range where the signal bandwidth is located, and covering the high frequency coverage signal to a target area.

8. The signal overlay method of claim 7,

each up-conversion bandwidth range corresponds to a frequency band;

controlling the up-conversion of the intermediate frequency downlink signal to a high frequency coverage signal according to the up-conversion bandwidth range where the signal bandwidth is located, specifically: and determining a frequency band corresponding to the up-conversion bandwidth range in which the signal bandwidth is positioned, and controlling the up-conversion of the intermediate-frequency downlink signal to a high-frequency coverage signal according to the determined frequency band.

9. A signal access unit, comprising:

the signal input interface is used for receiving a high-frequency downlink signal;

the signal bandwidth detection module is used for acquiring the signal bandwidth of the high-frequency downlink signal;

the micro-processing module is used for determining a bandwidth range where the signal bandwidth is located from a plurality of preset down-conversion bandwidth ranges, and determining the intermediate frequency of the high-frequency downlink signal after down-conversion according to the down-conversion bandwidth range where the signal bandwidth is located;

the frequency conversion module is used for controlling the down-conversion of the high-frequency downlink signal to an intermediate-frequency downlink signal according to the intermediate-frequency;

and the signal output interface is used for transmitting the intermediate frequency downlink signal.

10. A signal overlay unit, comprising:

the signal coverage interface is used for receiving a high-frequency uplink signal;

the radio frequency transceiving module is used for acquiring the signal bandwidth of the high-frequency uplink signal, determining a down-conversion bandwidth range in which the signal bandwidth is located from a plurality of preset down-conversion bandwidth ranges, and controlling the down-conversion of the high-frequency uplink signal to an intermediate-frequency uplink signal according to the down-conversion bandwidth range in which the signal bandwidth is located;

and the signal transmission interface outputs the intermediate frequency uplink signal.

11. A signal overlay unit, comprising:

the signal transmission interface is used for receiving the intermediate frequency downlink signal;

the radio frequency transceiving module is used for acquiring the signal bandwidth of the intermediate frequency downlink signal, determining an up-conversion bandwidth range in which the signal bandwidth is located from one or more preset up-conversion bandwidth ranges, and controlling the intermediate frequency downlink signal to be up-converted to a high-frequency coverage signal according to the up-conversion bandwidth range in which the signal bandwidth is located;

and the signal coverage interface is used for covering the high-frequency coverage signal to a target area.