CN107872284B - Self-excitation detection method and device of wireless repeater - Google Patents
Self-excitation detection method and device of wireless repeater Download PDFInfo
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- CN107872284B CN107872284B CN201610852975.6A CN201610852975A CN107872284B CN 107872284 B CN107872284 B CN 107872284B CN 201610852975 A CN201610852975 A CN 201610852975A CN 107872284 B CN107872284 B CN 107872284B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/40—Monitoring; Testing of relay systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W24/04—Arrangements for maintaining operational condition
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Abstract
The invention provides a self-excitation detection method and a self-excitation detection device of a wireless repeater. The method comprises the following steps: when the wireless repeater is electrified, acquiring the isolation of an uplink antenna and the isolation of a downlink antenna; and comparing the acquired uplink antenna isolation and downlink antenna isolation with the pre-designed uplink gain and downlink gain respectively, and judging whether the wireless repeater has slight self-excitation or serious self-excitation according to the comparison result. The self-excitation detection method and the self-excitation detection device of the wireless repeater can realize accurate measurement of the isolation of the access antenna and the return antenna under the condition that signals are not forwarded, and prompt installers of self-excitation risks when the isolation requirement of the antenna is smaller than the design requirement, so that the conditions that the signal-to-noise ratio of the forwarded signals is poor due to slight self-excitation, the signal-to-noise ratio of serious self-excitation is rapidly deteriorated, and even a radio frequency device is damaged are avoided. In addition, the invention realizes the isolation measurement between the access antenna and the return antenna by utilizing the circuit of the wireless repeater, and does not need to increase the cost of extra hardware.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a self-excitation detection method and a self-excitation detection device of a wireless repeater.
Background
The wireless repeater is a radio transmission transfer device for enhancing signals in the wireless communication transmission process. The isolation of the transceiving antennas is an important parameter for selecting the type of repeater. If the antenna is not installed properly, the isolation of the receiving and transmitting antenna is not enough, and is close to or smaller than the access gain, the output signal is fed back to the input end in a delayed way to form a positive feedback access, which causes serious distortion of the output signal to generate self-excitation. The signal-to-noise ratio of the forwarded signal is reduced due to slight self-excitation, the low-noise amplifier circuit and the power amplifier circuit work to a saturation state due to severe self-excitation, the radio frequency index is seriously deteriorated, and even the radio frequency circuit is damaged. Therefore, how to detect the isolation between the access antenna and the backhaul antenna and control the self-excitation becomes a key technology of the wireless repeater.
The existing wireless repeater monitors the power of an output signal in real time, and judges as self-excitation when the power of the output signal is greater than a certain threshold or is increased sharply.
In the process of implementing the invention, the inventor finds that at least the following technical problems exist in the prior art:
the wireless repeater can not be judged to be in a state of slight self-excitation or serious self-excitation, and as the self-excitation detection has certain hysteresis, once serious self-excitation occurs in the detection process, the radio frequency device can be damaged.
Disclosure of Invention
The self-excitation detection method and the self-excitation detection device of the wireless repeater can realize accurate measurement of the isolation of the access antenna and the return antenna under the condition that signals are not forwarded, accurately judge whether self-excitation risks exist or not through comparison of the actually measured isolation and the designed gain, and avoid the condition that the signal-to-noise ratio is reduced or even a radio frequency device is damaged due to serious self-excitation.
In a first aspect, the present invention provides a self-excitation detection method for a wireless repeater, including:
when the wireless repeater is electrified, acquiring the isolation of an uplink antenna and the isolation of a downlink antenna;
and comparing the acquired uplink antenna isolation and the acquired downlink antenna isolation with the pre-designed uplink gain A2 and downlink gain A1 respectively, and judging whether the wireless repeater has self-excitation according to the comparison result.
Optionally, the obtaining the isolation of the downlink antenna includes:
measuring the received signal strength indication or reference signal receiving power value of the full channel at the side of the base station under the state that the return radio frequency circuit does not work and the access antenna radio frequency circuit works;
selecting a frequency point without signals in the current network as a measurement frequency point F1 of the antenna isolation;
generating an analog IQ signal, placing a radio frequency circuit at the side of a return antenna in an F1 frequency point forced transmission state by using return transmission calibration parameters stored in calibration, and transmitting a signal TX1 with constant power;
opening a receiving channel at the side of an access antenna to work in an F1 frequency point forced receiving state while a return circuit works in a forced transmitting state, measuring a received IQ signal, and calculating the signal intensity RX1 of the end of the access antenna by calibrating a stored parameter table of the receiving circuit;
and taking TX1-RX1 as the isolation of a downlink antenna.
Optionally, the obtaining the uplink antenna isolation includes:
under the state that the access radio frequency circuit does not work and the return antenna radio frequency circuit works, measuring the received signal strength indication or reference signal return power value of the full channel at the antenna side of the terminal user;
selecting a frequency point without signals in the current network as a measurement frequency point F2 of the antenna isolation;
generating an analog IQ signal, placing a radio frequency circuit at the side of an access antenna in an F2 frequency point forced transmission state by using an access transmission calibration parameter stored by calibration, and transmitting a signal TX2 with constant power;
when the access circuit works in a forced transmitting state, opening a return channel at the return antenna side to work in an F2 frequency point forced return state, measuring and receiving IQ signals, and calculating the signal intensity at the return antenna end to be RX2 by calibrating and storing a return circuit parameter table;
and taking TX2-RX2 as the isolation of an uplink antenna.
Optionally, the obtained uplink antenna isolation and downlink antenna isolation are respectively compared with a pre-designed uplink gain a2 and downlink gain a1, and whether the wireless repeater is self-excited is determined according to a comparison result:
if the TX1-RX1 is greater than or equal to (A1+15) DB, judging that the wireless repeater does not generate self-excitation;
if the A1 < TX1-RX1 < (A1+15) DB, judging that the wireless repeater has slight self-excitation;
if the TX1-RX1 is not more than A1, the wireless repeater is judged to have serious self-excitation.
Optionally, the obtained uplink antenna isolation and downlink antenna isolation are respectively compared with a pre-designed uplink gain a2 and downlink gain a1, and whether the wireless repeater is self-excited is determined according to a comparison result:
if the TX2-RX2 is greater than or equal to (A2+15) DB, judging that the wireless repeater does not generate self-excitation;
if the A2 < TX2-RX2 < (A2+15) DB, judging that the wireless repeater has slight self-excitation;
if the TX2-RX2 is not more than A2, the wireless repeater is judged to have serious self-excitation.
In a second aspect, the present invention provides a self-excitation detection apparatus for a wireless repeater, including:
the wireless repeater comprises an acquisition unit, a processing unit and a control unit, wherein the acquisition unit is used for acquiring the isolation of an uplink antenna and the isolation of a downlink antenna after the wireless repeater is electrified;
and the judging unit is used for respectively comparing the acquired uplink antenna isolation and the acquired downlink antenna isolation with the pre-designed uplink gain A2 and downlink gain A1, and judging whether the wireless repeater has self-excitation according to the comparison result.
Optionally, the obtaining unit includes:
the first measurement subunit is used for measuring the received signal strength indication or the reference signal receiving power value of the full channel at the side of the base station under the state that the return radio frequency circuit does not work and the access antenna radio frequency circuit works;
the first selection subunit is used for selecting a frequency point without signals in the current network as a measurement frequency point F1 of the antenna isolation;
the first transmitting subunit is used for generating an analog IQ signal, placing the radio frequency circuit at the return antenna side in an F1 frequency point forced transmitting state by utilizing return transmitting calibration parameters stored by calibration, and transmitting a signal TX1 with constant power;
the first calculating subunit is used for opening a receiving channel at the side of the access antenna to work in an F1 frequency point forced receiving state while the return circuit works in a forced transmitting state, measuring a received IQ signal, and calculating the signal strength RX1 of the access antenna end by calibrating a stored parameter table of the receiving circuit;
and the second calculation subunit is used for taking TX1-RX1 as the downlink antenna isolation.
Optionally, the obtaining unit includes:
the second measuring subunit is used for measuring the received signal strength indication or the reference signal return power value of the full channel at the antenna side of the terminal user under the state that the access radio frequency circuit does not work and the return antenna radio frequency circuit works;
the second selection subunit is used for selecting a frequency point without signals in the current network as a measurement frequency point F2 of the antenna isolation;
the second transmitting subunit is used for generating an analog IQ signal, placing the radio frequency circuit at the side of the access antenna in an F2 frequency point forced transmitting state by using the access transmitting calibration parameters stored in calibration, and transmitting a signal TX2 with constant power;
the third calculating subunit is used for opening a return channel at the return antenna side to work in an F2 frequency point forced return state while the access circuit works in the forced transmission state, measuring a received IQ signal, and calculating the signal intensity at the return antenna end to be RX2 by calibrating a stored parameter table of the return circuit;
and the fourth calculating subunit is used for taking TX2-RX2 as the uplink antenna isolation.
Optionally, the determining unit is configured to compare the obtained uplink antenna isolation and the obtained downlink antenna isolation with a pre-designed uplink gain a2 and a pre-designed downlink gain a1, and determine that the wireless repeater does not self-excite when the TX1-RX1 ≧ (a1+15) DB;
when the A1 < TX1-RX1 < (A1+15) DB, judging that the wireless repeater has slight self-excitation;
and when the TX1-RX1 is not more than A1, judging that the wireless repeater has serious self excitation.
Optionally, the determining unit is configured to compare the obtained uplink antenna isolation and the obtained downlink antenna isolation with a pre-designed uplink gain a2 and a pre-designed downlink gain a1, and determine that the wireless repeater does not self-excite when the TX2-RX2 ≧ (a2+15) DB;
when the A2 < TX2-RX2 < (A2+15) DB, judging that the wireless repeater has slight self-excitation;
and when the TX2-RX2 is not more than A2, judging that the wireless repeater has serious self excitation.
According to the self-excitation detection method and device of the wireless repeater, when the wireless repeater is powered on, the uplink antenna isolation and the downlink antenna isolation are obtained; and comparing the acquired uplink antenna isolation and downlink antenna isolation with the pre-designed uplink gain and downlink gain respectively, and judging whether the wireless repeater is self-excited according to the comparison result. The self-excitation detection method and the self-excitation detection device of the wireless repeater can realize accurate measurement of the isolation of the access antenna and the return antenna under the condition that signals are not forwarded, and prompt installers of self-excitation risks when the isolation requirement of the antenna is smaller than the design requirement, so that the conditions that the signal-to-noise ratio of the forwarded signals is poor due to slight self-excitation, the signal-to-noise ratio of serious self-excitation is rapidly deteriorated, and even a radio frequency device is damaged are avoided. In addition, the invention realizes the isolation measurement between the access antenna and the return antenna by utilizing the circuit of the wireless repeater, and does not need to increase the cost of extra hardware.
Drawings
FIG. 1 is a flow chart of a self-excitation detection method of a wireless repeater according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of obtaining downlink antenna isolation in a self-excitation detection method of a wireless repeater according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of obtaining uplink antenna isolation in a self-excitation detection method of a wireless repeater according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a self-excitation detection apparatus of a wireless repeater according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a self-excitation detection apparatus of a wireless repeater according to another 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 given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a self-excitation detection method of a wireless repeater, as shown in figure 1, the method comprises the following steps:
and S11, acquiring the uplink antenna isolation and the downlink antenna isolation after the wireless repeater is powered on.
Wherein, a main channel for signal receiving and amplifying is formed by cascading two radio frequency transceiver chips. The transceiver at the return antenna side is used for communicating with the base station signal, and the transceiver at the receiving antenna side is used for communicating with the terminal user.
Optionally, as shown in fig. 2, the obtaining of the isolation of the downlink antenna includes:
measuring the received signal strength indication or reference signal receiving power value of the full channel at the side of the base station under the state that the return radio frequency circuit does not work and the access antenna radio frequency circuit works;
selecting a frequency point without signals in the current network as a measurement frequency point F1 of the antenna isolation;
generating an analog IQ signal, placing a radio frequency circuit at the side of a return antenna in an F1 frequency point forced transmission state by using return transmission calibration parameters stored in calibration, and transmitting a signal TX1 with constant power;
opening a receiving channel at the side of an access antenna to work in an F1 frequency point forced receiving state while a return circuit works in a forced transmitting state, measuring a received IQ signal, and calculating the signal intensity RX1 of the end of the access antenna by calibrating a stored parameter table of the receiving circuit;
and taking TX1-RX1 as the isolation of a downlink antenna.
Optionally, as shown in fig. 3, the obtaining the uplink antenna isolation includes:
under the state that the access radio frequency circuit does not work and the return antenna radio frequency circuit works, the received signal strength indication or the reference signal return power value of the full channel at the side of the base station is measured;
selecting a frequency point without signals in the current network as a measurement frequency point F2 of the antenna isolation;
generating an analog IQ signal, placing a radio frequency circuit at the side of an access antenna in an F2 frequency point forced transmission state by using an access transmission calibration parameter stored by calibration, and transmitting a signal TX2 with constant power;
when the access circuit works in a forced transmitting state, opening a return channel at the return antenna side to work in an F2 frequency point forced return state, measuring and receiving IQ signals, and calculating the signal intensity at the return antenna end to be RX2 by calibrating and storing a return circuit parameter table;
and taking TX2-RX2 as the isolation of an uplink antenna.
S12, comparing the obtained uplink antenna isolation and downlink antenna isolation with the pre-designed uplink gain A2 and downlink gain A1 respectively, and judging whether the wireless repeater has self-excitation according to the comparison result.
Optionally, the comparing the obtained uplink antenna isolation and the downlink antenna isolation with a pre-designed uplink gain a2 and a pre-designed downlink gain a1, and determining whether the wireless repeater self-excited according to the comparison result includes:
if the TX1-RX1 is greater than or equal to (A1+15) DB, judging that the wireless repeater does not generate self-excitation;
if the A1 < TX1-RX1 < (A1+15) DB, judging that the wireless repeater has slight self-excitation;
if the TX1-RX1 is not more than A1, the wireless repeater is judged to have serious self-excitation.
Optionally, the comparing the obtained uplink antenna isolation and the downlink antenna isolation with a pre-designed uplink gain a2 and a pre-designed downlink gain a1, and determining whether the wireless repeater self-excited according to the comparison result includes:
if the TX2-RX2 is greater than or equal to (A2+15) DB, judging that the wireless repeater does not generate self-excitation;
if the A2 < TX2-RX2 < (A2+15) DB, judging that the wireless repeater has slight self-excitation;
if the TX2-RX2 is not more than A2, the wireless repeater is judged to have serious self-excitation.
Optionally, prompting self-excited states of a user and an installer through different flashing states of the LED indicator lamp, and if the wireless repeater is judged not to be self-excited, turning off the self-excited alarm indicator lamp; if the wireless repeater is judged to have slight self-excitation, the self-excitation alarm indicator lamp flickers; if the wireless repeater is judged to have serious self-excitation, the self-excitation alarm indicator lamp is normally on, and installation personnel is prompted that the antenna isolation is not enough, and the antenna distance and direction or the gain of the repeater need to be adjusted.
According to the self-excitation detection method of the wireless repeater, when the wireless repeater is electrified, the uplink antenna isolation and the downlink antenna isolation are obtained; and comparing the acquired uplink antenna isolation and downlink antenna isolation with the pre-designed uplink gain and downlink gain respectively, and judging whether the wireless repeater is self-excited according to the comparison result. The self-excitation detection method and the self-excitation detection device of the wireless repeater can realize accurate measurement of the isolation of the access antenna and the return antenna under the condition that signals are not forwarded, and prompt installers of self-excitation risks when the isolation requirement of the antenna is smaller than the design requirement, so that the conditions that the signal-to-noise ratio of the forwarded signals is poor due to slight self-excitation, the signal-to-noise ratio of serious self-excitation is rapidly deteriorated, and even a radio frequency device is damaged are avoided. In addition, the invention realizes the isolation measurement between the access antenna and the return antenna by utilizing the circuit of the wireless repeater, and does not need to increase the cost of extra hardware.
The embodiment of the present invention further provides a self-excitation detection apparatus for a wireless repeater, as shown in fig. 4, the apparatus includes:
the acquiring unit 11 is configured to acquire an uplink antenna isolation and a downlink antenna isolation after the wireless repeater is powered on;
and the judging unit 12 is configured to compare the obtained uplink antenna isolation and the obtained downlink antenna isolation with a pre-designed uplink gain a2 and a pre-designed downlink gain a1, and judge whether the wireless repeater is self-excited according to a comparison result.
Optionally, as shown in fig. 5, the obtaining unit 11 of the self-excitation detecting apparatus of the wireless repeater further includes:
a first measuring subunit 21, configured to measure, in a state where the backhaul radio frequency circuit does not operate and the access antenna radio frequency circuit operates, a received signal strength indicator or a reference signal received power value of a full channel at the base station side;
the first selection subunit 22 is configured to select a frequency point with no signal in the existing network as a measurement frequency point F1 of the antenna isolation;
the first transmitting subunit 23 is configured to generate an analog IQ signal, place the rf circuit on the backhaul antenna side in an F1 frequency point forced transmitting state by using the backhaul transmission calibration parameters stored in the calibration, and transmit a signal TX1 with a constant power;
the first calculating subunit 24 is configured to, while the backhaul circuit operates in a forced transmission state, open a receiving path on the access antenna side to operate in a forced receiving state at the F1 frequency point, measure a received IQ signal, and calculate, by calibrating a stored parameter table of the receiving circuit, a signal strength RX1 at the access antenna end;
and the second calculating subunit 25 is used for taking TX1-RX1 as the downlink antenna isolation.
Optionally, as shown in fig. 5, the obtaining unit 11 of the self-excitation detecting apparatus of the wireless repeater further includes:
a second measuring subunit 31, configured to measure, in a state where the access rf circuit does not work and the return antenna rf circuit works, a received signal strength indicator or a reference signal return power value of the full channel at the antenna side of the terminal user;
a second selecting subunit 32, configured to select a frequency point without a signal in the existing network as a measurement frequency point F2 of the antenna isolation;
the second transmitting subunit 33 is configured to generate an analog IQ signal, place the rf circuit on the access antenna side in an F2 frequency point forced transmitting state by using the calibration stored access transmission calibration parameters, and transmit a signal TX2 with constant power;
a third calculating subunit 34, configured to open a backhaul channel at the backhaul antenna side to operate in an F2 frequency point forced backhaul state while the access circuit operates in the forced transmission state, measure the received IQ signal, and calculate, by calibrating and storing a backhaul circuit parameter table, the signal intensity at the backhaul antenna end to be RX 2;
and the fourth calculating subunit 35 is configured to use TX2-RX2 as the uplink antenna isolation.
Optionally, the determining unit of the self-excitation detecting apparatus of the wireless repeater is configured to compare the obtained uplink antenna isolation and the obtained downlink antenna isolation with a pre-designed uplink gain a2 and a pre-designed downlink gain a1, and determine that the wireless repeater does not self-excite when the TX1-RX1 ≧ (a1+15) DB;
when the A1 < TX1-RX1 < (A1+15) DB, judging that the wireless repeater has slight self-excitation;
and when the TX1-RX1 is not more than A1, judging that the wireless repeater has serious self excitation.
Optionally, the determining unit of the self-excitation detecting apparatus of the wireless repeater is configured to compare the obtained uplink antenna isolation and the obtained downlink antenna isolation with a pre-designed uplink gain a2 and a pre-designed downlink gain a1, and determine that the wireless repeater does not self-excite when the TX2-RX2 ≧ (a2+15) DB;
when the A2 < TX2-RX2 < (A2+15) DB, judging that the wireless repeater has slight self-excitation;
and when the TX2-RX2 is not more than A2, judging that the wireless repeater has serious self excitation.
According to the self-excitation detection device of the wireless repeater, when the wireless repeater is electrified, the uplink antenna isolation and the downlink antenna isolation are obtained; and comparing the acquired uplink antenna isolation and downlink antenna isolation with the pre-designed uplink gain and downlink gain respectively, and judging whether the wireless repeater is self-excited according to the comparison result. The self-excitation detection method and the self-excitation detection device of the wireless repeater can realize accurate measurement of the isolation of the access antenna and the return antenna under the condition that signals are not forwarded, and prompt installers of self-excitation risks when the isolation requirement of the antenna is smaller than the design requirement, so that the conditions that the signal-to-noise ratio of the forwarded signals is poor due to slight self-excitation, the signal-to-noise ratio of serious self-excitation is rapidly deteriorated, and even a radio frequency device is damaged are avoided. In addition, the invention realizes the isolation measurement between the access antenna and the return antenna by utilizing the circuit of the wireless repeater, and does not need to increase the cost of extra hardware.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A self-excitation detection method of a wireless repeater is characterized by comprising the following steps:
when the wireless repeater is electrified, acquiring the isolation of an uplink antenna and the isolation of a downlink antenna;
comparing the obtained uplink antenna isolation and the downlink antenna isolation with an uplink gain A2 and a downlink gain A1 which are designed in advance respectively, and judging whether the wireless repeater is self-excited or not according to a comparison result;
the acquiring of the downlink antenna isolation includes:
measuring the received signal strength indication or reference signal receiving power value of the full channel at the side of the base station under the state that the return radio frequency circuit does not work and the access antenna radio frequency circuit works;
selecting a frequency point without signals in the current network as a measurement frequency point F1 of the antenna isolation;
generating an analog IQ signal, placing a radio frequency circuit at the side of a return antenna in an F1 frequency point forced transmission state by using return transmission calibration parameters stored in calibration, and transmitting a signal TX1 with constant power;
opening a receiving channel at the side of an access antenna to work in an F1 frequency point forced receiving state while a return circuit works in a forced transmitting state, measuring a received IQ signal, and calculating the signal intensity RX1 of the end of the access antenna by calibrating a stored parameter table of the receiving circuit;
and taking TX1-RX1 as the isolation of a downlink antenna.
2. The method of claim 1, wherein the obtaining the uplink antenna isolation comprises:
under the state that the access radio frequency circuit does not work and the return antenna radio frequency circuit works, measuring the received signal strength indication or reference signal return power value of the full channel at the antenna side of the terminal user;
selecting a frequency point without signals in the current network as a measurement frequency point F2 of the antenna isolation;
generating an analog IQ signal, placing a radio frequency circuit at the side of an access antenna in an F2 frequency point forced transmission state by using an access transmission calibration parameter stored by calibration, and transmitting a signal TX2 with constant power;
when the access circuit works in a forced transmitting state, opening a return channel at the return antenna side to work in an F2 frequency point forced return state, measuring and receiving IQ signals, and calculating the signal intensity at the return antenna end to be RX2 by calibrating and storing a return circuit parameter table;
and taking TX2-RX2 as the isolation of an uplink antenna.
3. The method of claim 1, wherein the comparing the obtained uplink antenna isolation and downlink antenna isolation with a pre-designed uplink gain a2 and downlink gain a1, respectively, and determining whether the self-excitation of the wireless repeater occurs according to the comparison result comprises:
if the TX1-RX1 is greater than or equal to (A1+15) DB, judging that the wireless repeater does not generate self-excitation;
if the A1 < TX1-RX1 < (A1+15) DB, judging that the wireless repeater has slight self-excitation;
if the TX1-RX1 is not more than A1, the wireless repeater is judged to have serious self-excitation.
4. The method of claim 2, wherein the comparing the obtained uplink antenna isolation and downlink antenna isolation with a pre-designed uplink gain a2 and downlink gain a1, respectively, and determining whether the self-excitation of the wireless repeater occurs according to the comparison result comprises:
if the TX2-RX2 is greater than or equal to (A2+15) DB, judging that the wireless repeater does not generate self-excitation;
if the A2 < TX2-RX2 < (A2+15) DB, judging that the wireless repeater has slight self-excitation;
if the TX2-RX2 is not more than A2, the wireless repeater is judged to have serious self-excitation.
5. A self-excitation detection device of a wireless repeater is characterized by comprising:
the wireless repeater comprises an acquisition unit, a processing unit and a control unit, wherein the acquisition unit is used for acquiring the isolation of an uplink antenna and the isolation of a downlink antenna after the wireless repeater is electrified;
the judging unit is used for respectively comparing the acquired uplink antenna isolation and the acquired downlink antenna isolation with a pre-designed uplink gain A2 and a pre-designed downlink gain A1 and judging whether the wireless repeater is self-excited or not according to a comparison result;
the acquisition unit includes:
the first measurement subunit is used for measuring the received signal strength indication or the reference signal receiving power value of the full channel at the side of the base station under the state that the return radio frequency circuit does not work and the access antenna radio frequency circuit works;
the first selection subunit is used for selecting a frequency point without signals in the current network as a measurement frequency point F1 of the antenna isolation;
the first transmitting subunit is used for generating an analog IQ signal, placing the radio frequency circuit at the return antenna side in an F1 frequency point forced transmitting state by utilizing return transmitting calibration parameters stored by calibration, and transmitting a signal TX1 with constant power;
the first calculating subunit is used for opening a receiving channel at the side of the access antenna to work in an F1 frequency point forced receiving state while the return circuit works in a forced transmitting state, measuring a received IQ signal, and calculating the signal strength RX1 of the access antenna end by calibrating a stored parameter table of the receiving circuit;
and the second calculation subunit is used for taking TX1-RX1 as the downlink antenna isolation.
6. The apparatus of claim 5, wherein the obtaining unit comprises:
the second measuring subunit is used for measuring the received signal strength indication or the reference signal return power value of the terminal user side antenna full channel under the state that the access radio frequency circuit does not work and the return antenna radio frequency circuit works;
the second selection subunit is used for selecting a frequency point without signals in the current network as a measurement frequency point F2 of the antenna isolation;
the second transmitting subunit is used for generating an analog IQ signal, placing the radio frequency circuit at the side of the access antenna in an F2 frequency point forced transmitting state by using the access transmitting calibration parameters stored in calibration, and transmitting a signal TX2 with constant power;
the third calculating subunit is used for opening a return channel at the return antenna side to work in an F2 frequency point forced return state while the access circuit works in the forced transmission state, measuring a received IQ signal, and calculating the signal intensity at the return antenna end to be RX2 by calibrating a stored parameter table of the return circuit;
and the fourth calculating subunit is used for taking TX2-RX2 as the uplink antenna isolation.
7. The apparatus of claim 5, wherein the determining unit is configured to compare the obtained uplink antenna isolation and downlink antenna isolation with a pre-designed uplink gain a2 and downlink gain a1, respectively, and determine that the self-excitation of the wireless repeater does not occur when the TX1-RX1 ≧ (a1+15) DB;
when the A1 < TX1-RX1 < (A1+15) DB, judging that the wireless repeater has slight self-excitation;
and when the TX1-RX1 is not more than A1, judging that the wireless repeater has serious self excitation.
8. The apparatus of claim 6, wherein the determining unit is configured to compare the obtained uplink antenna isolation and downlink antenna isolation with a pre-designed uplink gain a2 and downlink gain a1, respectively, and determine that the self-excitation of the wireless repeater does not occur when the TX2-RX2 ≧ (a2+15) DB;
when the A2 < TX2-RX2 < (A2+15) DB, judging that the wireless repeater has slight self-excitation;
and when the TX2-RX2 is not more than A2, judging that the wireless repeater has serious self excitation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610852975.6A CN107872284B (en) | 2016-09-26 | 2016-09-26 | Self-excitation detection method and device of wireless repeater |
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| CN110875771B (en) * | 2018-08-31 | 2021-05-25 | 展讯通信（上海）有限公司 | Communication method and system between multi-node repeaters |
| CN109617625B (en) * | 2018-11-23 | 2021-09-24 | 赛尔通信服务技术股份有限公司 | Method for measuring distance between antennas |
| CN111263376B (en) * | 2018-11-30 | 2023-04-25 | 中国移动通信集团浙江有限公司 | Method and device for identifying self-excited repeater |
| CN109639335B (en) * | 2018-12-20 | 2021-03-19 | 京信通信系统（中国）有限公司 | Self-excitation processing method and device for wireless repeater |
| CN111756461B (en) * | 2020-07-23 | 2022-08-16 | 展讯通信（上海）有限公司 | Self-excitation detection method and system of wireless signal relay amplification device |
| CN112162302A (en) * | 2020-10-13 | 2021-01-01 | 西安中星伟业通信科技有限公司 | Beidou RNSS RDSS multi-frequency point intelligent control signal repeater |
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