CN114142890A - Radio frequency signal transmission device - Google Patents
Radio frequency signal transmission device Download PDFInfo
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- CN114142890A CN114142890A CN202111408618.8A CN202111408618A CN114142890A CN 114142890 A CN114142890 A CN 114142890A CN 202111408618 A CN202111408618 A CN 202111408618A CN 114142890 A CN114142890 A CN 114142890A
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- 230000008054 signal transmission Effects 0.000 title claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 239000013078 crystal Substances 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 description 14
- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
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- Engineering & Computer Science (AREA)
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Abstract
The invention provides a radio frequency signal transmission device, which comprises: the outdoor unit is connected with the indoor unit through a coaxial cable; radio frequency signals, control signals and direct current signals are transmitted between the outdoor unit and the indoor unit. The invention realizes the simultaneous transmission of radio frequency signals, control signals and direct current signals through the coaxial cables between the outdoor unit and the indoor unit, solves the problem of multi-path signal synthesis by using a single cable, and increases the construction convenience and the equipment portability.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a radio frequency signal transmission device.
Background
An ODU (outdoor Unit) in a wireless communication system needs to communicate with an IDU (Indoor Unit), and the IDU needs to monitor various working states of the ODU in real time and also needs to perform real-time data communication with the ODU. In the prior art, both ODU and IDU wireless communication generally adopt a direct current + single-path radio frequency signal mode, and a plurality of cables are adopted to transmit direct current signals, control signals and radio frequency signals respectively, which easily causes cross modulation and distortion of multipath signals, reduces signal quality, and has poor large antenna effect. Meanwhile, the attitude and the rotation of the antenna require real-time performance, but the control signal interference is large, electromagnetic spectrum sputtering with extremely wide energy spectrum is easily generated, the radio frequency signal transmitted and received by the antenna is interfered, and the simultaneous transmission of the direct current signal, the control signal and the radio frequency signal cannot be realized.
Meanwhile, the cable transmits high-power direct-current signals, and even if small direct-current resistance exists, the ground levels at two ends of the cable are not grounded, so that the technical problem which needs to be solved at present is that multiple paths of signals are transmitted by a single cable on the premise of not additionally increasing interference.
Disclosure of Invention
The invention provides a radio frequency signal transmission device which is used for solving the problem that a single cable cannot be adopted to simultaneously transmit multiple paths of signals in the prior art.
The invention provides a radio frequency signal transmission device, comprising: an outer unit and an indoor unit,
the outdoor unit is connected with the indoor unit through a coaxial cable;
radio frequency signals, control signals and direct current signals are transmitted between the outdoor unit and the indoor unit.
Optionally, the outdoor unit comprises: the detector is used for detecting a digital signal from a signal received by the antenna; the multiplier is used for modulating the digital signal to a high-stability crystal oscillator to obtain a radio frequency signal; the band-pass filter is used for converting the radio frequency signal into an intermediate frequency signal; the power amplifier is used for power amplifying the filtered radio frequency signal; and the combiner is used for combining the radio frequency signal and the direct current signal.
Optionally, the outdoor unit further includes a splitter, where the splitter is configured to split the radio frequency signal and the direct current signal to obtain a radio frequency signal; and the multiplier is also used for demodulating the radio frequency signal to obtain a digital signal.
Optionally, the combiner combines the radio frequency signal and the direct current signal according to a preset rule; the splitter splits the radio frequency signal and the direct current signal according to a preset rule.
Optionally, the indoor unit delivers the high ballast to the outdoor unit via a coaxial cable.
Optionally, the frequency of the high-stability crystal oscillator is 100 MHZ.
Optionally, the digital signal comprises one or more digital signals.
Optionally, the radio frequency signal is an adjacent channel.
Optionally, the outdoor unit further includes an electrically tunable attenuator, and the electrically tunable attenuator is controlled according to the control signal.
Optionally, the splitter splits the radio frequency signal and the direct current signal through a capacitor; the combiner combines the radio frequency signal and the direct current signal through the inductor.
According to the technical scheme, the invention comprises the following steps: the outdoor unit is connected with the indoor unit through a coaxial cable; radio frequency signals, control signals and direct current signals are transmitted between the outdoor unit and the indoor unit. The invention realizes the simultaneous transmission of radio frequency signals and direct current signals through the coaxial cables between the outdoor unit and the indoor unit, solves the problem of multi-channel signal synthesis by using a single cable, and increases the construction convenience and the equipment portability.
Drawings
Fig. 1 is a schematic structural diagram of an rf signal transmission apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an outdoor unit according to an embodiment of the present invention;
fig. 3 is a schematic frequency spectrum diagram of a transmission signal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a schematic structural diagram of a radio frequency signal transmission apparatus according to an embodiment of the present invention, and as shown in fig. 1, the transmission apparatus according to the embodiment includes: an outdoor unit 11 and an indoor unit 12.
In the embodiment, the outdoor unit 11 is connected to the indoor unit 12 through a coaxial cable, and radio frequency signals, control signals, and direct current signals are transmitted between the outdoor unit 11 and the indoor unit 12. Each terminal station or relay station of a wireless communication system is generally connected together by an outdoor unit and a pair of directional antennas, which are small in size, and the outdoor unit is connected with the indoor unit through a coaxial cable to complete signal transmission and power feeding. The transmission signal comprises a radio frequency signal and a control signal, the feed comprises a direct current signal, and the multiplier modulates the digital signal to a high-stability crystal oscillator so as to form the radio frequency signal.
Fig. 2 is a schematic structural diagram of an outdoor unit according to an embodiment of the present invention, and as shown in fig. 2, the outdoor unit includes: a detector 21, a multiplier 22, an amplifier 23, a band-pass filter 24 and a combiner 25.
The detector 21 detects a digital signal to be transmitted from a signal received by the antenna; the multiplier 22 modulates the digital signal to a high-stability crystal oscillator to obtain a radio frequency signal; the band-pass filter 23 converts the radio frequency signal into an intermediate frequency signal; the power amplifier 24 power-amplifies the filtered radio frequency signal; the combiner 25 combines the radio frequency signal and the direct current signal.
The outdoor unit receives a number of signals from the antenna, a detector is a device that detects a useful signal from the number of signals, which can be used to identify waves, oscillations or the presence or change of the signal, and a detector is used to extract the desired digital information, for example, the useful digital signal can be detected by the frequency range of the signal, which can include 100MHZ-1000 MHZ.
The high-stability crystal oscillator is generated by the indoor unit and is transmitted to the outdoor unit through the coaxial cable, the frequency of the high-stability crystal oscillator can comprise 100MHz, the frequency spectrum can be shifted through modulation, the frequency spectrum of the modulated digital signal can be shifted to a required position, and therefore the modulated signal is converted into a signal which is favorable for channel multiplexing. The frequency spectrum shifting enables the multi-path signals transmitted by the cable to be orderly staggered, overlapping is avoided, the frequency spectrum of the radio frequency signal is shifted to an adjacent channel, the frequency spectrum bandwidth is reduced, and electromagnetic frequency spectrum sputtering is prevented.
The high-stability crystal oscillator is used as a carrier, the multiplier modulates one or more paths of digital signals onto the high-stability crystal oscillator so as to acquire radio-frequency signals, and meanwhile, the multiplier is also used for demodulating the radio-frequency signals so as to acquire the digital signals. One outdoor unit generates one path of digital signals, a plurality of outdoor units generate a plurality of paths of digital signals, and one indoor unit can transmit signals one by one with the same outdoor unit or transmit signals one by one with a plurality of outdoor units through coaxial cables.
The band-pass filter is a filter which can pass through frequency components in a certain frequency range and attenuate the frequency components in other ranges to a very low level, in the radio-frequency signal transmission device, the band-pass filter can perform signal selection and suppress stray and frequency source stray after power amplification, the band-pass filter can convert a plurality of paths of radio-frequency signals into intermediate-frequency signals, the intermediate-frequency can be preset according to user requirements, the requirement that the plurality of paths of radio-frequency signals occupy narrow channels is met, and the frequency spectrum bandwidth is reduced.
In the front stage circuit of the transmission apparatus, the power of the modulated signal generated by the modulation oscillation circuit is small, and the modulated signal needs to be subjected to a series of amplification, such as a buffer stage, an intermediate amplification stage, and a final power amplification stage, to obtain sufficient radio frequency power before being transmitted to the indoor unit for subsequent processing. For the transmitting end, the modulated signal needs to be power-amplified and then fed to the antenna for radiation, in order to obtain a sufficient radio frequency output power, a power amplifier must be used, after the modulator generates the radio frequency signal, the radio frequency signal is amplified to a sufficient power by the power amplifier, passes through the matching network, and is then transmitted by the antenna.
The combiner combines the radio frequency signal and the direct current signal according to a preset rule, and the preset rule can include: in frequency band order, energy size or signal properties, etc. The combiner adds radio frequency signals to direct current at the input end of the coaxial cable through the characteristic of high-quality inductance direct current resistance alternating current.
The branching unit combines the radio frequency signal and the direct current signal according to a preset rule, wherein the preset rule can comprise: in frequency band order, energy size or signal properties, etc. The shunt separates the direct current signal from the radio frequency signal through the characteristic that the direct current is conducted through the direct current blocking capacitor, and then the signals transmitted in the coaxial cable are separated through multi-stage filtering sampling, so that the purity of each path of signals is ensured.
The indoor unit transmits the high-stability crystal oscillator to the outdoor unit through the coaxial cable, because the temperature of the outdoor unit is large and the high-stability crystal oscillator is high in cost, the frequency of the high-stability crystal oscillator can be selected according to the frequency of the radio frequency signal, for example, the frequency of the high-stability crystal oscillator can be selected to be 100 MHZ.
The outdoor unit further comprises an electrically-tuned attenuator, the electrically-tuned attenuator attenuates the power of the radio-frequency signal to a certain proportion multiple to achieve a safe or ideal voltage value, the indoor unit transmits a control signal to the outdoor unit through a coaxial cable, the electrically-tuned attenuator is controlled according to the control signal, the radio-frequency signal is electrically tuned by controlling the direct-current bias current of the electrically-tuned attenuator, and the radio-frequency signal is attenuated to a proper voltage value, such as a 12V voltage value, according to preset requirements.
Fig. 3 is a schematic frequency diagram of a transmission signal according to an embodiment of the present invention, and as shown in fig. 3, the signals transmitted on the coaxial cable include a dc signal, a control signal, a high-stability crystal oscillator, a radio frequency signal a, and a radio frequency signal B.
The direct current signal, the control signal, the high-stability crystal oscillator, the radio frequency signal A and the radio frequency signal B in the coaxial cable are subjected to frequency spectrum shifting, the frequency spectrum corresponding to the direct current signal is 0Hz, the control signal and the high-stability crystal oscillator correspond to the low frequency spectrum, the radio frequency signal A and the radio frequency signal B occupy adjacent narrow channels, the occupied adjacent channels are key frequency spectrums for communication, and multiple paths of signals in the coaxial cable are orderly staggered to avoid overlapping.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Those of ordinary skill in the art will understand that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.
Claims (10)
1. A radio frequency signal transmission apparatus, comprising: an outdoor unit and an indoor unit,
the outdoor unit is connected with the indoor unit through a coaxial cable;
radio frequency signals, control signals and direct current signals are transmitted between the outdoor unit and the indoor unit.
2. The transmission apparatus according to claim 1, the outdoor unit comprising: a detector, a multiplier, an amplifier, a band-pass filter and a combiner,
the detector is used for detecting a digital signal from a signal received by the antenna;
the multiplier is used for modulating the digital signal to a high-stability crystal oscillator to obtain a radio frequency signal;
the band-pass filter is used for converting the radio frequency signal into an intermediate frequency signal;
the power amplifier is used for power amplifying the filtered radio frequency signal;
the combiner is used for combining the radio frequency signal and the direct current signal.
3. Transmission apparatus according to claim 2, wherein said outdoor unit further comprises a splitter,
the shunt is used for shunting the radio frequency signal and the direct current signal to obtain the radio frequency signal;
the multiplier is further configured to demodulate the radio frequency signal to obtain the digital signal.
4. Transmission device according to claim 3,
the combiner combines the radio frequency signal and the direct current signal according to a preset rule;
and the splitter splits the radio frequency signal and the direct current signal according to a preset rule.
5. The transmission apparatus according to claim 2, wherein the indoor unit transmits the high-stability crystal oscillator to the outdoor unit through a coaxial cable.
6. The transmission apparatus according to claim 5, wherein the frequency of the high-stability crystal oscillator is 100 MHz.
7. The transmission apparatus of claim 3, wherein the digital signal comprises one or more digital signals.
8. The transmission apparatus of claim 3, wherein the radio frequency signal is an adjacent channel.
9. Transmission apparatus as claimed in claim 3, characterized in that said outdoor unit further comprises an electrically adjustable attenuator,
and controlling the electrically-adjusted attenuator according to the control signal.
10. Transmission device according to claim 3,
the shunt branches the radio frequency signal and the direct current signal through a capacitor;
the combiner combines the radio frequency signal and the direct current signal through an inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111408618.8A CN114142890A (en) | 2021-11-25 | 2021-11-25 | Radio frequency signal transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111408618.8A CN114142890A (en) | 2021-11-25 | 2021-11-25 | Radio frequency signal transmission device |
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| Publication Number | Publication Date |
|---|---|
| CN114142890A true CN114142890A (en) | 2022-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111408618.8A Pending CN114142890A (en) | 2021-11-25 | 2021-11-25 | Radio frequency signal transmission device |
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| CN (1) | CN114142890A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN121055036A (en) * | 2025-11-05 | 2025-12-02 | 西安大合智能科技有限公司 | Ka frequency band active phased array antenna system |
-
2021
- 2021-11-25 CN CN202111408618.8A patent/CN114142890A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN121055036A (en) * | 2025-11-05 | 2025-12-02 | 西安大合智能科技有限公司 | Ka frequency band active phased array antenna system |
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Application publication date: 20220304 |
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