CN216437186U - Frequency shift NB-IOT repeater equipment - Google Patents
Frequency shift NB-IOT repeater equipment Download PDFInfo
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- CN216437186U CN216437186U CN202123432669.2U CN202123432669U CN216437186U CN 216437186 U CN216437186 U CN 216437186U CN 202123432669 U CN202123432669 U CN 202123432669U CN 216437186 U CN216437186 U CN 216437186U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
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- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 4
- 238000002955 isolation Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000000969 carrier Substances 0.000 description 1
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- 238000010295 mobile communication Methods 0.000 description 1
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Abstract
The utility model discloses a shift frequency NB-IOT repeater equipment, the utility model discloses a set up the baseband chip, carry out frequency conversion processing with received signal through the baseband chip, send the signal after the frequency conversion to receiving radio frequency transceiver or cover radio frequency transceiver, destroyed the condition that the auto excitation produced through the frequency shift technique, can avoid equipment because the not enough auto excitation phenomenon that causes of isolation for when equipment uses, long distance on the needs physics is not with the condition such as sheltering from, the application scene of equipment is more extensive, the installation is under construction simpler, the operation is more stable, reduce maintenance pressure and cost.
Description
Technical Field
The utility model belongs to the repeater field, concretely relates to shift frequency NB-IOT repeater equipment.
Background
In the existing NB-IoT network, operators deploy NB-IoT carriers in the existing mobile communication frequency band in order to improve the spectrum utilization rate, under the condition, NB-IoT carrier signals are adjacent to GSM and LTE in the working frequency band, and because the deployment quantity of NB-IoT base stations is less than that of LTE and GSM, a common wireless repeater amplifies the NB-IoT signals, a receiver receives the LTE and GSM signals in the same frequency band, the signals are often stronger than the NB-IoT signals, and after the signals enter the repeater, the gain of the receiver can be compressed, so that the amplifying capability of the repeater is reduced, the function of amplifying the NB-IoT signals is not achieved, and the extension effect of the wireless repeater on the coverage range of the NB-IoT signals is limited. There is a need for a wireless repeater specifically targeted at NB-IoT signals that guarantees the amplification gain of the NB-IoT signals within the frequency band while being immune to neighboring others such as GMS and LTE.
When the common wireless repeater is in actual application, the isolation degree of the whole system is not enough due to the influence of the installation environment and the terrain at that time, so that the self-excitation phenomenon of equipment occurs, the coverage capability of the equipment is seriously influenced, the installation and construction difficulty is increased, and the maintenance cost of the equipment is high.
Disclosure of Invention
An object of the utility model is to overcome the above-mentioned not enough, provide a shift frequency NB-IOT repeater equipment, utilized the shift frequency technique, moved received signal to other frequency points of NB-IOT and forwarded away, make the received signal frequency point different with the transmitted signal frequency point to this avoids equipment to take place the auto excitation, improve equipment stability, and it is convenient to make the equipment fixing.
In order to achieve the above object, the present invention includes a baseband chip, the baseband chip is connected to the receiving rf transceiver and the covering rf transceiver, the covering rf transceiver is connected to the covering uplink, the covering uplink is connected to the covering duplexer, the covering duplexer is connected to the covering downlink and the covering antenna, and the covering downlink is connected to the covering rf transceiver; the receiving radio frequency transceiver is connected with a receiving uplink, the receiving uplink is connected with a receiving duplexer, the receiving duplexer is connected with a receiving downlink and a receiving antenna, and the receiving downlink is connected with the receiving radio frequency transceiver;
the baseband chip is used for carrying out frequency conversion processing on the received signals and sending the frequency-converted signals to the receiving radio frequency transceiver or the covering radio frequency transceiver;
the receiving antenna is used for receiving the donor signal;
the covering antenna is used for covering signals sent by the repeater.
The overlay uplink, the overlay downlink, the receive uplink, and the receive downlink each include filters for reserving the desired NB-IOT signals and filtering out other signals.
Both the overlay uplink and the receive uplink include amplifiers for amplifying the device signals.
Both the cover downlink and the receive downlink include low noise amplification for amplifying the signal while producing as low noise and distortion as possible.
The overlay uplink includes a first filter coupled to the overlay radio frequency transceiver and to a first amplifier coupled to the overlay duplexer.
The coverage downlink comprises a first low noise amplifier which is connected with the coverage duplexer and a second filter, and the second filter is connected with the coverage radio frequency transceiver.
The receiving uplink comprises a second low-noise amplifier, the second low-noise amplifier is connected with the receiving duplexer and a third filter, and the third filter is connected with the receiving radio frequency transceiver.
The receiving downlink comprises a fourth filter, the fourth filter is connected with the receiving radio frequency transceiver and the second amplifier, and the second amplifier is connected with the receiving duplexer.
Compared with the prior art, the utility model discloses a set up the baseband chip, carry out frequency conversion processing with received signal through the baseband chip, signal transmission after will changing the frequency is sent to and is received radio frequency transceiver or cover radio frequency transceiver, the condition that the auto-excitation produced has been destroyed through the frequency shift technique, can avoid equipment because the not enough auto-excitation phenomenon that causes of isolation, when making equipment use, be not in the long distance that needs physics and shelter from the condition such as, the applied scene of equipment is more extensive, the installation and construction is simpler, the operation is more stable, reduce maintenance pressure and cost.
Drawings
Fig. 1 is a system diagram of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, the present invention includes a baseband chip, the baseband chip connects to receive rf transceiver and cover rf transceiver, the cover rf transceiver connects to cover uplink, the cover uplink connects to cover duplexer, the cover duplexer connects to cover downlink and cover antenna, the cover downlink connects to cover rf transceiver; the receiving radio frequency transceiver is connected with a receiving uplink, the receiving uplink is connected with a receiving duplexer, the receiving duplexer is connected with a receiving downlink and a receiving antenna, and the receiving downlink is connected with the receiving radio frequency transceiver;
the baseband chip is used for carrying out frequency conversion processing on the received signals and sending the frequency-converted signals to the receiving radio frequency transceiver or the covering radio frequency transceiver;
the receiving antenna is used for receiving the donor signal;
the covering antenna is used for covering signals sent by the repeater.
The overlay uplink, the overlay downlink, the receive uplink, and the receive downlink each include filters for reserving the desired NB-IOT signals and filtering out other signals. Both the overlay uplink and the receive uplink include amplifiers for amplifying the device signals. Both the cover downlink and the receive downlink include low noise amplification for amplifying the signal while producing as low noise and distortion as possible. The overlay uplink includes a first filter coupled to the overlay radio frequency transceiver and to a first amplifier coupled to the overlay duplexer.
The coverage downlink comprises a first low noise amplifier which is connected with the coverage duplexer and a second filter, and the second filter is connected with the coverage radio frequency transceiver.
The receiving uplink comprises a second low-noise amplifier, the second low-noise amplifier is connected with the receiving duplexer and a third filter, and the third filter is connected with the receiving radio frequency transceiver.
The receiving downlink comprises a fourth filter, the fourth filter is connected with the receiving radio frequency transceiver and the second amplifier, and the second amplifier is connected with the receiving duplexer.
The receiving antenna receives 900MHz signals, the 900MHz signals are transmitted to the second low-noise amplifier through the receiving duplexer, the second low-noise amplifier transmits the amplified signals to the third filter, the third filter filters the signals in the working frequency band, only NB-IoT signals DLf1 are reserved, other service signals (such as GSM and LTE) in the band are filtered, and then the signals DLf1 are transmitted to the baseband chip through the receiving radio frequency transceiver.
After resolving the received DLf1 signal, the baseband chip determines the frequency point of the received signal, moves the frequency point by 300KHz (either adding 300KHz or subtracting 300KHz can be determined mainly according to the frequency point of the received signal, and the principle is that the frequency point cannot be moved out of the NB-IOT frequency band, so that the frequency point is still in the NB-IOT frequency band after frequency shift), obtains a frequency-shifted signal DLf2, and then transmits a DLf2 signal to the first filter.
The first filter filters the signal again, only the DLf2 signal is reserved, then the DLf2 signal is amplified by the first amplifier and transmitted to the covering duplexer, the covering duplexer transmits the DLf2 signal through the covering antenna, at this time, the received signal is DLf1, the signal sent by the covering antenna is DLf2, and the received signal is a signal with different frequencies, so that self-excitation of the equipment due to insufficient isolation is avoided.
The coverage antenna receives an uplink signal sent by the terminal, the uplink signal is transmitted to the first low-noise amplifier, the uplink signal is transmitted to the second filter after the first low-noise amplifier amplifies the uplink signal, the second filter filters other signals, and an uplink signal Ulf2 of the NB-IOT is left.
The baseband chip analyzes the received ULf2 signal, firstly, judges whether the frequency of the received uplink signal is correct according to the downlink frequency shift signal, if not, the equipment is restarted, and network searching synchronization is carried out again. If the frequency is correct, the frequency is directly shifted according to the downlink frequency shift information, the frequency is restored to the frequency point ULf1 which is the same as the information source, and then the DLf1 signal is transmitted to the fourth filter.
The fourth filter filters the obtained signal, only the Ulf1 signal is retained, the signal is amplified by the second amplifier and transmitted to the receiving duplexer, the receiving duplexer transmits the signal to the receiving antenna through the radio frequency interface, the receiving antenna transmits the uplink signal to the base station, and the process is the reverse processing of the downlink signal.
The embodiment is as follows:
the 900MHz frequency band signal of space is received from the receiving antenna of equipment, and the working frequency band contains GSM900, LTE900, NB-IoT signal, the total power is-45 dBm, wherein NB-IoT signal power is-60 dBm, and the bandwidth is 200 KHz. The signals enter a second low-noise amplifier through a receiving duplexer and are amplified, then the signals enter a third filter to filter the rest signals, only the signals of the NB-IOT are reserved, the signals enter a baseband chip, the baseband chip analyzes the specific NB-IOT signal frequency, and when the frequency is 879.9MHz, the baseband chip reduces the frequency to 300KHz and changes the frequency into 879.6 MHz. The signals are filtered by the first filter, amplified by the first amplifier, transmitted to the covering antenna through the covering duplexer and the radio frequency connector and transmitted out, and the coverage of NB-IOT signals is realized.
The covering antenna of the equipment receives signals, the signals are transmitted to the first low-noise amplifier to be amplified through the covering duplexer, other signals are filtered through the second filter, only NB-IOT signals are reserved, the baseband chip analyzes and tests the frequency of the received uplink signals, whether the frequency is 834.6MHz is judged, if the frequency is not the frequency, the equipment is restarted, and network searching synchronization is carried out again. If the frequency is 834.6MHz, the frequency is directly added with 300KHz to become 834.9 MHz. And the frequency-converted signal is filtered and amplified through a fourth filter and a second amplifier, and is transmitted to a base station through a receiving duplexer and an antenna.
Claims (8)
1. A frequency shift NB-IOT repeater device is characterized by comprising a baseband chip, wherein the baseband chip is connected with a receiving radio frequency transceiver and a covering radio frequency transceiver, the covering radio frequency transceiver is connected with a covering uplink, the covering uplink is connected with a covering duplexer, the covering duplexer is connected with a covering downlink and a covering antenna, and the covering downlink is connected with the covering radio frequency transceiver; the receiving radio frequency transceiver is connected with a receiving uplink, the receiving uplink is connected with a receiving duplexer, the receiving duplexer is connected with a receiving downlink and a receiving antenna, and the receiving downlink is connected with the receiving radio frequency transceiver;
the baseband chip is used for carrying out frequency conversion processing on the received signals and sending the frequency-converted signals to the receiving radio frequency transceiver or covering the radio frequency transceiver;
the receiving antenna is used for receiving the donor signal;
the covering antenna is used for covering signals sent by the repeater.
2. The frequency shifting NB-IOT repeater device according to claim 1, wherein the overlay uplink, the overlay downlink, the receive uplink and the receive downlink each comprise filters for preserving the desired NB-IOT signal and filtering out other signals.
3. The frequency-shifting NB-IOT repeater device according to claim 1, wherein the overlay uplink and the receive uplink each comprise an amplifier for amplifying the device signal.
4. The frequency-shifting NB-IOT repeater device according to claim 1, wherein the cover downlink and the receive downlink each include low noise amplification for amplifying the signal while producing as low noise and distortion as possible.
5. The frequency shifting NB-IOT repeater device according to claim 1, wherein the overlay uplink includes a first filter coupled to the overlay rf transceiver and to a first amplifier coupled to the overlay duplexer.
6. The frequency shifting NB-IOT repeater device according to claim 1, wherein the overlay downlink includes a first low noise amplifier connected to the overlay duplexer and a second filter connected to the overlay rf transceiver.
7. The frequency shifting NB-IOT repeater device according to claim 1, wherein the receive uplink comprises a second low noise amplifier, the second low noise amplifier is connected to the receive duplexer and a third filter, and the third filter is connected to the receive rf transceiver.
8. The frequency-shifting NB-IOT repeater device of claim 1, wherein the receive downlink includes a fourth filter coupled to the receive RF transceiver and to the second amplifier, the second amplifier coupled to the receive duplexer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123432669.2U CN216437186U (en) | 2021-12-30 | 2021-12-30 | Frequency shift NB-IOT repeater equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123432669.2U CN216437186U (en) | 2021-12-30 | 2021-12-30 | Frequency shift NB-IOT repeater equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216437186U true CN216437186U (en) | 2022-05-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123432669.2U Active CN216437186U (en) | 2021-12-30 | 2021-12-30 | Frequency shift NB-IOT repeater equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216437186U (en) |
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2021
- 2021-12-30 CN CN202123432669.2U patent/CN216437186U/en active Active
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Effective date of registration: 20221114 Address after: Floor 1, Building D5, Jinwutong Pioneer Park, Jinzhai Modern Industrial Park, Lu'an, Anhui 237321 Patentee after: Anhui Tianji Communication Technology Co.,Ltd. Address before: 710065 20 / F, building 1, Xijing 3, No.3 dianzi West Street, high tech Zone, Xi'an City, Shaanxi Province Patentee before: SHAANXI TIANJI COMMUNICATION TECHNOLOGY Co.,Ltd. |