CN101995513A - Algorithms for detecting feeder line radio-frequency power and antenna standing-wave ratio in mobile communication system through RFID - Google Patents
Algorithms for detecting feeder line radio-frequency power and antenna standing-wave ratio in mobile communication system through RFID Download PDFInfo
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Abstract
The invention relates to algorithms for detecting feeder line radio-frequency power and antenna standing-wave ratio in a mobile communication system through RFID. A feeder line radio-frequency power algorithm comprises that: for a certain radio-frequency power tag R, the response sensitivity is a constant Pref, and the output power of full power of a reader can be detected through the output power of the reader; and an antenna standing-wave ratio algorithm comprises that: for a certain standing-wave ratio tag V, when an antenna is normal, the reflected energy of the antenna is insufficient to excite the tag, the tag V cannot be stored in a reader disc, and the reader sets a reasonable value for the standing-wave ratio of the tag V for representing a normal state of the standing-wave ratio. The calculation methods for the feeder line radio-frequency power and the antenna standing-wave ratio can effectively monitor the antenna and the feeder line in the mobile communication system so as not to monitor the system through wired connection without additional cable. The engineering difficulty can be reduced, and the cost of network lines and twisted pairs in the mobile communication system is saved.
Description
Technical field
The present invention relates to the detection method of radio communication device, especially a kind of computing method that detect mobile communication system feeder line radio-frequency power and antenna standing wave ratio by RFID.
Background technology
Along with the fast development of China's mobile communication cause, the especially continuous expansion of 3G network, the radio network optimization and the network coverage demonstrate its importance day by day.Soverlay technique commonly used comprises outdoor macro honeycomb, indoor microcellulor, distributed base station, various repeater technical schemes such as (trunk amplifier, tower amplifier, wireless intra-frequency repeater, optical fiber repeater, frequency-shift repeater, carrier tanks), according to the difference of communication standard, can be divided into the equipment of different systems such as GSM, CDMA, WCDMA, TD-SCDMA, CDMA2000 again.But no matter which kind of standard and scheme are all formed a complete wireless shrouding system by active equipment and antenna feeder subsystem in the actual engineering.Often because unscheduled events such as external force or water inlet cause work undesired, can monitor and report fault alarm signal in real time to it be the problem that operator presses for solution for antenna, feeder line.
Traditional antenna feeder monitoring system comprises monitoring main frame, switch, slave, ground terminal, feeder line monitoring terminal and standing-wave ratio (SWR) monitoring terminal.Feeder line monitoring terminal and ground terminal are serially connected with the two ends of monitored feeder line, the monitoring terminal sent alarm signal when feeder line was unusual, slave receives that this signal passes to main frame by the 1-wire communication mode after treatment, and main frame relies on wired or wireless mode the warning information of feeder line to be transferred to the Surveillance center of active equipment.Standing-wave ratio (SWR) monitoring terminal utilizes forward and reverse detection to realize the monitoring of standing-wave ratio (SWR), also can monitor feeder line simultaneously, and the communication mode of itself and main frame still adopts 1-wire.At present, there is following problem in such monitoring system: realize 1-wire communication with netting twine between principal and subordinate's (staying) machine, its inside provides the power supply power supply, is not passive system completely; When adopting common netting twine, principal and subordinate's machine communication distance is shorter, adopts high-grade cable can increase communication distance, but can bring the increase of cost; Adopt twisted-pair feeder to connect between slave and the feeder line monitoring terminal, increased cost equally; The total system complex structure is made troubles to installation.
Summary of the invention
At the deficiency of above existing antenna feeder monitoring system, the purpose of this invention is to provide a kind of computing method by RFID detection mobile communication system feeder line radio-frequency power, and the computing method of antenna standing wave ratio.
The objective of the invention is by realizing by the following technical solutions:
A kind of algorithm that detects mobile communication system feeder line radio-frequency power by RFID, comprise that the repeater of mobile communication system or base station are to feeder line between the antenna and antenna, and the main frame, slave, diplexer and the RFID device that are used for system monitoring, described feeder line radio-frequency power computing method comprise:
For some radio-frequency power label R, its response sensitivity is a constant Pref, and the output power of reader full power can record by the output power of reader, is expressed as Po;
When the reader normal power was taken inventory, label R can be taken inventory by reader;
When reader reduces output power one by one, when having decayed n cdBm, label R can not be taken inventory by reader again;
Therefore, the RFID signal power value that the label R in the time of can learning the emission of reader full power receives is P1=Pref+n-1;
So, reader is exactly Δ=Po-P1 to the link transmission RFID loss of signal of label; This loss is suitable equally for the GSM signal, and the GSM signal power at reader place can be measured as P1_gsm by the power detection of monitoring mainboard, therefore can calculate the monitored feeder line radio-frequency power P=P1_gsm-Δ at label place.
A kind of algorithm that detects the mobile communication system antenna standing wave ratio by RFID, comprise that the repeater of mobile communication system or base station are to feeder line between the antenna and antenna, and the main frame, slave, diplexer and the RFID device that are used for system monitoring, the evaluation method of described detection antenna standing wave ratio comprises:
For certain standing-wave ratio (SWR) label V, when antenna was normal, the reflected energy of antenna was not enough to excite label, and label V can not be taken inventory by reader, and reader represents the antenna standing wave ratio normal condition for rational value of standing wave ratio setting of label V;
When antenna breaks down, the antenna-reflected energy increases, and activates label, this standing-wave ratio (SWR) label can be taken inventory by reader, reduces the output power of reading one by one, in the time of decay n dBm, this label can not be taken inventory again, can draw in lab investigation by searching
Form as table 1, can be known this antenna standing wave ratio value;
When standing wave ratio greater than 2.0 the time, reader is set at 2.5 for the standing wave ratio of label V, expression antenna catastrophic failure.
As the preferred technical solution of the present invention, described
The method for building up of form is as follows:
A, being benchmark with standing wave ratio 1.5, reader output is adjusted into undamped output, is that 1.5 test antenna is tested with a standing wave ratio; Elder generation is set to minimum with the coupling value of the coupling mechanism of standing-wave ratio (SWR) label, and at this time label can't be coupled to the antenna opening reflected signal, and reader can't be taken inventory this label; Increase the coupling value of coupling mechanism one by one, just taken inventory up to label; At this moment coupling value will be recorded, and no longer adjust;
B, the standing wave ratio of test antenna is adjusted to 1.6, because test antenna standing-wave ratio (SWR) label can just be taken inventory by reader when standing wave ratio is 1.5, when the standing wave ratio of test antenna is adjusted into 1.6,, can be taken inventory reflected signal because strengthening this standing-wave ratio (SWR) label; Reduce the reader output power one by one, in the time of decay n dBm, label can not be taken inventory, and so, can write down the corresponding standing-wave ratio (SWR) 1.6 of pad value n;
C, the standing wave ratio with test antenna is adjusted into 1.7-2.0 successively, like this, just can measure the corresponding n value of all fault standing wave ratios (1.5-2.0), sets up form.
The invention has the beneficial effects as follows: with respect to prior art, utilize the computing method of feeder line radio-frequency power provided by the invention and antenna standing wave ratio effectively to monitor to the antenna feeder of mobile communication system, thereby do not need to carry out system monitoring by wired connection, do not need to increase any cable, the present invention can reduce the engineering difficulty, saved the cost of netting twine and twisted-pair feeder in the mobile communication system.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing and specific embodiment:
Fig. 1 is the schematic diagram that the present invention calculates radio-frequency power and standing-wave ratio (SWR);
Fig. 2 is return loss of the present invention and standing-wave ratio (SWR) mapping table.
Embodiment
A kind of computing method that detect mobile communication system feeder line radio-frequency power by RFID, comprise that the repeater of mobile communication system or base station are to feeder line between the antenna and antenna, and the main frame, slave, diplexer and the RFID device that are used for system monitoring, described feeder line radio-frequency power computing method comprise:
For some radio-frequency power label R, its response sensitivity is a constant Pref, and the output power of reader full power can record by the output power of reader, is expressed as Po;
When the reader normal power was taken inventory, label R can be taken inventory by reader;
When reader reduces output power one by one, when having decayed n dBm, label R can not be taken inventory by reader again;
Therefore, the RFID signal power value that the label R in the time of can learning the emission of reader full power receives is P1=Pref+n-1;
So, reader is exactly Δ=Po-P1 to the link transmission RFID loss of signal of label; This loss is suitable equally for the GSM signal, and the GSM signal power at reader place can be measured as P1_gsm by the power detection of monitoring mainboard, therefore can calculate the monitored feeder line radio-frequency power P=P1_gsm-Δ at label place.Be an example that calculates the feeder line radio-frequency power below:
The activation sensitivity of label is Pref=10dBm;
The full power of reader (0 decay) is Po=40dBm;
During 0 decay, label can be taken inventory by reader;
Reduce the output power of reader one by one, in the time of decay n=11dBm, label no longer can be taken inventory by reader;
Can learn that during the reader full power, the RFID signal power that label receives is P1=Pref+n-1=10+11-1=20dBm;
Reader is to the RFID loss of signal Δ=Po-P1=40-20=20dBm of this section of label transmission link;
The GSM signal power at reader place has monitoring host computer to record P1_gsm=50dBm;
Can learn the radio-frequency power P=P1_gsm-Δ=50-20=30dBm of the monitored feeder line in label place.
System principle is as follows:
As shown in Figure 1, the monitoring main frame inserts in trunk feeder by RFID frequency range cavity diplexer, the monitoring slave is serially connected in the feeder line of antenna port end, work in the 840-845MHz frequency range, utilize the half-duplex operation mode of RFID to realize repeater/base station is monitored to feeder line between the antenna and antenna, its receiving and transmitting signal transmits in radio-frequency cable by coupling mechanism.
Utilize the reflection modulation formula working method of RFID to communicate between main frame and the slave.During system works, main frame is by reader chip emission radio-frequency queries signal, slave obtains radiofrequency signal by directional coupler from feeder line, signal with portion of energy is converted into direct current then, tag circuit work is provided, and the data message modulation back reflection that the signal of another part energy has been preserved in the electronic tag returns main frame.
Monitoring has a RFID reader in the main frame, in each passive monitoring slave two passive RF labels (Tag) is arranged, and label is used for the monitoring to feeder line, and the another one label is used for the monitoring to antenna, and each label all has own unique ID number.According to the certain protocol standard, main frame conducts interviews by the feeder line label of reader to each slave, if the correct response that can receive respective labels is arranged, then shows this section feeder line operate as normal; The antenna tag of each slave the inside is to lean on the reflected signal of antenna opening that energy work is provided, so just often can not produce response to the visit of main frame at antenna; On the contrary, when antenna broke down, reflected energy increased, and label is activated and sends signal to main frame, and main frame can be realized the effective monitoring to antenna feeder thus.
As shown in Figure 2, be corresponding form according to the intercepting of the corresponding relation of return loss and standing-wave ratio (SWR) VSWR.Therefore, just can learn the standing-wave ratio (SWR) VSWR of antenna as long as know return loss.But in fact can't directly record return loss, might as well adopt another kind of mode, be benchmark with certain standing-wave ratio (SWR) earlier, is benchmark such as VSWR_ref=1.5, at this moment return loss reference value RL_ref=13.979.As long as know the difference DELTA=RL1-RL_ref of return loss, table look-up and just can know how much current standing wave ratio is.
A kind of computing method that detect the mobile communication system antenna standing wave ratio by RFID, comprise that the repeater of mobile communication system or base station are to feeder line between the antenna and antenna, and the main frame, slave, diplexer and the RFID device that are used for system monitoring, the evaluation method of described detection antenna standing wave ratio comprises:
For certain standing-wave ratio (SWR) label V, when antenna was normal, the reflected energy of antenna was not enough to excite label, and label V can not be taken inventory by reader, and reader represents the antenna standing wave ratio normal condition for rational value of standing wave ratio setting of label V;
When antenna breaks down, the antenna-reflected energy increases, and activates label, this standing-wave ratio (SWR) label can be taken inventory by reader, reduces the output power of reading one by one, in the time of decay n dBm, this label can not be taken inventory again, can draw in lab investigation by searching
Form as table 1, can be known this antenna standing wave ratio value;
When standing wave ratio greater than 2.0 the time, reader is set at 2.5 for the standing wave ratio of label V, expression antenna catastrophic failure.
Table 1
Converting form
| The N value | |
| 1 | 1.5 |
| 2 | 1.6 |
| 3 | 1.7 |
| 4 | 1.8 |
| 5 | 1.9 |
| 6 | 2.0 |
Described
The method for building up of form is as follows:
A, being benchmark with standing wave ratio 1.5, reader output is adjusted into undamped output, is that 1.5 test antenna is tested with a standing wave ratio; Elder generation is set to minimum with the coupling value of the coupling mechanism of standing-wave ratio (SWR) label, and at this time label can't be coupled to the antenna opening reflected signal, and reader can't be taken inventory this label; Increase the coupling value of coupling mechanism one by one, just taken inventory up to label; At this moment coupling value will be recorded, and no longer adjust;
B, the standing wave ratio of test antenna is adjusted to 1.6, because test antenna standing-wave ratio (SWR) label can just be taken inventory by reader when standing wave ratio is 1.5, when the standing wave ratio of test antenna is adjusted into 1.6,, can be taken inventory reflected signal because strengthening this standing-wave ratio (SWR) label; Reduce the reader output power one by one, in the time of decay n dBm, label can not be taken inventory, and so, can write down the corresponding standing-wave ratio (SWR) 1.6 of pad value n;
C, the standing wave ratio with test antenna is adjusted into 1.7-2.0 successively, like this, just can measure the corresponding n value of all fault standing wave ratios (1.5～2.0), sets up form.
Claims (3)
1. algorithm that detects mobile communication system feeder line radio-frequency power by RFID, comprise that the repeater of mobile communication system or base station are to feeder line between the antenna and antenna, and the main frame, slave, diplexer and the RFID device that are used for system monitoring, it is characterized in that: described feeder line radio-frequency power computing method comprise:
For some radio-frequency power label R, its response sensitivity is a constant Pref, and the output power of reader full power can record by the output power of reader, is expressed as Po;
When the reader normal power was taken inventory, label R can be taken inventory by reader;
When reader reduces output power one by one, when having decayed n dBm, label R can not be taken inventory by reader again;
Therefore, the RFID signal power value that the label R in the time of can learning the emission of reader full power receives is Pl=Pref+n-1;
So, reader is exactly Δ=Po-Pl to the link transmission RFID loss of signal of label; This loss is suitable equally for the GSM signal, and the GSM signal power at reader place can be measured as Pl_gsm by the power detection of monitoring mainboard, therefore can calculate the monitored feeder line radio-frequency power P=Pl_gsm-Δ at label place.
2. algorithm that detects the mobile communication system antenna standing wave ratio by RFID, comprise that the repeater of mobile communication system or base station are to feeder line between the antenna and antenna, and the main frame, slave, diplexer and the RFID device that are used for system monitoring, it is characterized in that: the evaluation method of described detection antenna standing wave ratio comprises:
For certain standing-wave ratio (SWR) label V, when antenna was normal, the reflected energy of antenna was not enough to excite label, and label V can not be taken inventory by reader, and reader represents the antenna standing wave ratio normal condition for rational value of standing wave ratio setting of label V;
When antenna breaks down, the antenna-reflected energy increases, and activates label, this standing-wave ratio (SWR) label can be taken inventory by reader, reduces the output power of reading one by one, in the time of decay n dBm, this label can not be taken inventory again, can draw in lab investigation by searching
Form as following table 1, can be known this antenna standing wave ratio value;
When standing wave ratio greater than 2.0 the time, reader is set at 2.5 for the standing wave ratio of label V, expression antenna catastrophic failure.
Table 1
Converting form
3. the algorithm that detects the mobile communication system antenna standing wave ratio by RFID according to claim 2 is characterized in that: described
The method for building up of form is as follows:
A, being benchmark with standing wave ratio 1.5, reader output is adjusted into undamped output, is that 1.5 test antenna is tested with a standing wave ratio; Elder generation is set to minimum with the coupling value of the coupling mechanism of standing-wave ratio (SWR) label, and at this time label can't be coupled to the antenna opening reflected signal, and reader can't be taken inventory this label; Increase the coupling value of coupling mechanism one by one, just taken inventory up to label; At this moment coupling value will be recorded, and no longer adjust;
B, the standing wave ratio of test antenna is adjusted to 1.6, because test antenna standing-wave ratio (SWR) label can just be taken inventory by reader when standing wave ratio is 1.5, when the standing wave ratio of test antenna is adjusted into 1.6,, can be taken inventory reflected signal because strengthening this standing-wave ratio (SWR) label; Reduce the reader output power one by one, in the time of decay n dBm, label can not be taken inventory, and so, can write down the corresponding standing-wave ratio (SWR) 1.6 of pad value n;
C, the standing wave ratio with test antenna is adjusted into 1.7-2.0 successively, like this, just can measure the corresponding n value of all fault standing wave ratios (1.5-2.0), sets up form.
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