CN1777074B - Method for monitoring wireless high-frequency-amplification station isolation degree using pilot frequency multi-channel signal - Google Patents

Abstract

The present invention relates to a method for monitoring the isolation degree of a wireless repeater by using a pilot multipath signal. The method mainly includes the following steps: 1.1), by reading the process data of the internal searcher of the built-in monitoring module of the wireless repeater system, The data value includes the carrier/interference ratio Ec/Io and time scale data; 1.2), calculate the carrier/interference ratio of the main path pilot signal of the wireless repeater and the pilot carrier/interference ratio of the repeater feedback multipath signal , the pilot carrier/interference ratio of the above-mentioned repeater co-fed multipath signal includes time window constraints; 1.3), calculate the repeater system isolation margin, isolation margin=main path pilot signal carrier/interference ratio - Feedback the pilot carrier/interference ratio of the multipath signal. The beneficial effects of the present invention are: monitor the isolation margin at any time, and protect the repeater system from being in a state where the isolation margin is insufficient (adjusting the gain of the repeater, etc.) and cooperate with other network quality detection technologies to make the repeater system The station system is highly reliable, highly secure, and self-adaptive.

Description

Method of Monitoring Wireless Repeater Isolation Degree Using Pilot Multipath Signal

technical field

The invention relates to mobile communication technology, in particular to a method for monitoring the isolation degree of wireless repeaters by using pilot frequency multipath signals.

Background technique

Mobile communication plays a huge role in our lives, and the wireless coverage technology of mobile communication is also developing continuously. Now operators require seamless coverage, and China has a vast land and sparse population, and the population distribution is uneven. In many places, such as rural areas, Roads, railways, tunnels, small underground parking lots, small building interiors, and pilot polluted areas (CDMA system), due to the small traffic, cost considerations, and mobile phone switching speed considerations, etc., all require a large number of wireless repeaters In the opening and operation of the wireless repeater, the antenna isolation is the main parameter considered in the system consideration and engineering installation. If the isolation margin between the donor antenna and the retransmission antenna is less than the system requirement ( The general requirement is greater than 15dB), which will lead to a rapid decline in system performance, signal distortion, and waste of power. In severe cases, it will cause self-excitation and interfere with the network. In CDMA systems (including WCDMA/CDMA2000) due to the soft handover mechanism, the uplink interference can be extended to a large base station. , affecting the coverage of the base station. In the actual system, environmental changes such as the antenna being blown away by the wind and new reflectors near the antenna will also affect the isolation. Real-time monitoring of the isolation margin is very important for the safe operation of the network.

The traditional method is to bring a signal source and a spectrum analyzer during installation, and connect them to the donor antenna and the retransmission antenna respectively to test the isolation between the antennas. The other is to bring a signal source and a spectrum analyzer (module) inside the repeater to detect the isolation, which will increase the cost because transmitting a certain signal will interfere with the network operation; another method is to detect the downlink output of the repeater The power makes it never produce clipping, because the clipping may be self-excited, but this method is not sensitive enough to distinguish the situation close to self-excitation (it cannot meet the requirement that the detection isolation margin is greater than 15dB); there is also a It is a spectrum analyzer (or module) for detecting the frequency spectrum of the output signal of the repeater, that is, detecting the flatness in the channel band (CDMA2000 and WCDMA system), because when the isolation margin is not enough, the frequency spectrum in the output channel band will be uneven. However, the sensitivity of this method is not high enough (it cannot meet the requirement that the detection isolation margin is greater than 15dB); it also increases the cost.

Contents of the invention

The present invention aims to solve the above-mentioned defects in the prior art, and provides a method for monitoring the isolation degree of wireless repeaters by using pilot frequency multipath signals.

The present invention solves the technical scheme that its technical problem adopts. The method for monitoring the isolation degree of a wireless repeater by using a pilot multipath signal mainly includes the following steps:

1.1), by reading the process data of the internal searcher of the built-in monitoring module of the wireless repeater system, that is, the data values of multiple multipath pilot signals received by the receiver, the data values include the load/interference ratio Ec/Io and time scale data; when the network has multiple carriers, the working channel of the monitoring module should be among the working channels of the repeater;

1.2), calculate the carrier/interference ratio of the main path pilot signal of the wireless repeater and the pilot carrier/interference ratio of the repeater feedback multipath signal, the pilot carrier/interference ratio of the above-mentioned repeater feedback multipath signal Include time window constraints;

1.3) Calculate the isolation margin of the repeater system, where the isolation margin = the carrier/interference ratio of the main path pilot signal - the pilot carrier/interference ratio of the feedback multipath signal.

The specific steps of the method of the present invention are as follows:

2.1), after reading a group of multipath pilot signals through the repeater monitoring module, first find the main path pilot signal with the largest carrier/interference ratio and use the time mark of this signal as the time point to locate, after finding out this time Whether there is another or more multi-path pilot signals in the delay window which is equivalent to the delay of the repeater plus the delay of the coupling path of the antenna feeder (according to the range of delays that may vary according to different delays in different projects, that is, the delay window) ;

2.2), if there is, compare this multipath pilot signal carrier/interference ratio (Ec/Io) with the main path pilot signal carrier/interference ratio (Ec/Io), if this difference is the actual current If the isolation margin is greater than the set value of the isolation margin (such as 15dB), the system is safe;

2.3), if the difference is less than the set value, you need to rule out whether there is the same multipath pilot signal on the main path. The method is to reduce the gain of the repeater and re-test, that is, re-read the time window after reducing the gain The carrier/interference ratio (Ec/Io) of the multipath pilot signal in the multipath pilot signal is compared with the main path pilot signal at this time; if the difference becomes larger in the same proportion, it proves that the measured isolation margin (isolation degree remains unchanged, the gain becomes smaller, and the isolation margin becomes larger), and measures need to be taken to prevent the occurrence of self-excitation (such as reducing the gain); if it does not change, the multipath pilot signal is the multipath pilot signal on the main receiving path Signal, continue to detect after restoring the original gain; if the difference change and gain change are not in the same proportion, it may be that the isolation margin signal is mixed with the multipath signal on the donor receiving path, and the accuracy of this test method is affected at this time (This sensitive multipath can be eliminated by changing the delay of the repeater system such as extending the cable to avoid the same delay multipath problem on the donor receiving path, or changing the direction of the donor antenna, or changing the lobe of the donor antenna, etc. ), it is necessary to continue to monitor (and give an alarm if necessary).

2.4), if there is no multipath pilot signal in the time window, the system isolation margin is above the detection sensitivity, (the minimum monitoring of pilot multipath (Ec/Io) can reach -30dB, that is, the feedback pilot signal at this time Frequency (Ec/Io) is lower than -30dB, and the carrier/interference ratio (Ec/Io) of the main path is generally greater than -15dB at worst), that is, the isolation margin is very good.

2.5), if there are multiple qualified multipath pilot signals, then multiple qualified multipath pilot signals should be converted into power addition and then subtracted from the main path pilot signal; then obtain the isolation margin.

In addition to using Ec/Io subtraction (between each Ec/Io obtained at the same time), you can also use the main pilot power (which can also be accumulated) and the feedback pilot power (which can also be accumulated) to calculate the isolation margin (because The pilot power value of the base station is constant). (Pilot Power=Total RX Received Power*Ec/Io of Pilot). The specific steps of the method are as follows: first obtain the pilot energy of the main path and the energy of the feedback pilot and obtain its smooth value through multiple accumulations to eliminate part of the measurement randomness error, and then take the dBm scale value of the logarithmic value of the energy, Then obtain the isolation margin, the isolation margin=the dBm scale value of the smoothed energy value of the main path pilot signal-the dBm scaled value of the smoothed energy value of the feedback multipath signal.

The beneficial effects of the present invention are: monitor the isolation margin at any time, and protect the repeater system from being in a state where the isolation margin is insufficient (adjusting the gain of the repeater, etc.) and cooperate with other network quality detection technologies to make the repeater system The station system is highly reliable, highly secure, and self-adaptive.

Features of the present invention compared to other technologies:

High sensitivity (15 ~ 20dB).

Online without downtime.

No monitoring signal needs to be emitted.

real-time monitoring.

利用系统原有的监控模块不需要增加监测硬件。

Using the original monitoring module of the system does not require additional monitoring hardware.

Description of drawings

Fig. 1 is a schematic diagram of the feedback signal flow of the present invention;

Fig. 2 is a schematic diagram of the repeater system of the present invention;

Fig. 3 is a schematic diagram of the time window of the present invention;

Fig. 4 is the feedback pilot signal time domain diagram of the present invention;

Fig. 5 is a subflow chart of the isolation margin signal of the present invention;

Fig. 6 is the main flow chart of the multipath interference of the band that excludes the donor of the present invention;

Fig. 7 is a connection block diagram of the system simulation test of the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

As shown in Figure 2: A, the donor antenna, the function is to receive the signal from the base station; B, the monitoring coupler in the repeater, the function is to couple part of the signal from the base station to the monitoring module; C, the BS (base station) in the repeater end) duplexer; D, downlink low-noise amplifier; E, intermediate frequency filter and gain adjustment, etc., generally including surface acoustic wave filter (or digital filter plus digital-to-analog and analog-to-digital converter) The time delay comparison of this part Large (2-10 microseconds); F, power amplifier; G, MS (mobile phone service area end) duplexer; H, retransmission antenna (coverage area antenna) is used to send the amplified signal to the service area; I 1. Uplink loop (the principle is the same as downlink loop), the function is to amplify the uplink signal of the mobile phone and send it back to the base station; Frequency multipath parameter extraction signal source; K, the control center (CPU) of the repeater, the original management of the repeater, now increases the isolation margin processing function (including alarm) (reading the pilot multipath signal data of the monitoring module And be processed and judged, etc.). The large arrows at the top of the figure are the signal feedback paths between the antennas (isolation between antennas).

As shown in Figure 3: it briefly shows the time-domain distribution diagram of multiple pilot feedback signals generated by the feedback of one pilot signal after passing through the repeater system (the third and above feedbacks are too small to be omitted).

The method of using the pilot multipath signal to monitor the isolation of the wireless repeater, the specific steps are as follows:

2.1), after reading a group of multipath pilot signals through the repeater monitoring module, first find the main path pilot signal with the largest carrier/interference ratio and use the time mark of this signal as the time point to locate, after finding out this time Whether there is another or more multi-path pilot signals in the delay window which is equivalent to the delay of the repeater plus the delay of the coupling path of the antenna feeder (according to the range of delays that may vary according to different delays in different projects, that is, the delay window) ;

2.2), if there is, compare this multipath pilot signal carrier/interference ratio (Ec/Io) with the main path pilot signal carrier/interference ratio (Ec/Io), if this difference is the actual current If the isolation margin is greater than the set value of the isolation margin (such as 15dB), the system is safe;

2.3), if the difference is less than the set value, you need to rule out whether there is the same multipath pilot signal on the main path. The method is to reduce the gain of the repeater and re-test, that is, re-read the time window after reducing the gain The carrier/interference ratio (Ec/Io) of the multipath pilot signal in the multipath pilot signal is compared with the main path pilot signal at this time; if the difference becomes larger in the same proportion, it proves that the measured isolation margin (isolation degree remains unchanged, the gain becomes smaller, and the isolation margin becomes larger), and measures need to be taken to prevent the occurrence of self-excitation (such as reducing the gain); if it does not change, the multipath pilot signal is the multipath pilot signal on the main receiving path Signal, continue to detect after restoring the original gain; if the difference change and gain change are not in the same proportion, it may be that the isolation margin signal is mixed with the multipath signal on the donor receiving path, and the accuracy of this test method is affected at this time (This sensitive multipath can be eliminated by changing the delay of the repeater system such as extending the cable to avoid the same delay multipath problem on the donor receiving path, or changing the direction of the donor antenna, or changing the lobe of the donor antenna, etc. ), it is necessary to continue to monitor (and give an alarm if necessary).

2.4), if there is no multipath pilot signal in the time window, the system isolation margin is above the detection sensitivity, (the minimum monitoring of pilot multipath (Ec/Io) can reach -30dB, that is, the feedback pilot signal at this time Frequency (Ec/Io) is lower than -30dB, and the carrier/interference ratio (Ec/Io) of the main path is generally greater than -15dB at worst), that is, the isolation margin is very good.

Interpretation of the time window: that is, from the start of the delay of the repeater (the feeder length is 0) to the possible maximum feeder length of a conventional project of 60 meters, plus the feedback path delay between antennas, such as the total delay of 50 meters corresponds to The time delay is (60/0.88*0.0033+50*0.0033=0.39 microseconds); if the time delay of the repeater is 3.67 microseconds, the time delay window is 3.67～4.06 microseconds (that is, the different possibilities of the use environment range of feedback time). See Figure 3.

2.5), if there are multiple qualified multipath pilot signals, then multiple qualified multipath pilot signals should be converted into power addition and then subtracted from the main path pilot signal; then obtain the isolation margin.

Description of the real-time monitoring method of isolation margin:

3.1. If the isolation margin of the wireless repeater (i.e., the isolation minus the system gain of the repeater, Note: the change in gain and the change in the isolation will cause the change in the isolation margin) is not enough, that is (wireless direct station system) is equivalent to retrieving the amplified signal and amplifying it again (the time delay is the time delay of the repeater plus the time delay between the antenna and feeder lines), because the repeater system has enough time delay (the repeater Host delay (known) (according to the machine is between 2 and 10 microseconds, the specific machine is a fixed value, such as the machine we used for testing is 3.67 microseconds) plus the external feedback antenna feeder path (according to different projects about ( The feeder length is 0 and the delay is 0) to the possible maximum feeder length of a conventional project 60 meters delay plus the feedback path delay between antennas. For example, the total delay of 50 meters corresponds to a delay of (60/0.88*0.0033+ 50*0.0033=0.39 microseconds) delay), since the time window is known, as long as the carrier/interference ratio (Ec/Io) of the pilot meets the detection range (within 0～-30dB), it can be detected.

3.2. The pilot signal itself is a fixed repetitive signal, which adopts synchronous detection technology and can be detected in an environment with low carrier-to-noise ratio (for example: the actual mobile phone uses synchronous demodulation technology to achieve the Ec/Io of the multi-path pilot component as -30dB sensitivity).

3.3. The pilot signal can distinguish multipath signals with different time delays and detect different time scale values respectively (the time delay difference between multiple channels = the difference between the clocks represented by each time scale value); the time resolution is WCDMA (1/(3840000*8)=3.255*10 ^-8 seconds)) and (1/(1228800*8)=1.017*10 ^-7 seconds) of CDMA2000.

3.4. The pilot signal is the basis of the WCDMA system (including CDMA2000), that is, the process data of the searcher inside the receiver of the monitoring module (the parameters of the multipath signal of the internal pilot of the wireless system network (including the carrier/interference ratio ( Ec/Io) and time stamp data)) can be used only by reading out (the relevant passwords and instructions and decoding of the monitoring module manufacturer are required).

3.5. In the actual environment, there may be multipath signals contained in the donor signal received by the repeater and within the time delay window (time delay of the repeater system) of our repeater for isolation detection. If you want to distinguish it, you need Reduce the gain of the repeater by 1~2dB to distinguish. If it is an isolation signal, the value obtained by subtracting the multi-path signal from the pilot ground-to-interference ratio of the main path at this time, that is, the isolation margin will become larger (Note: The isolation degree remains the same, the gain becomes smaller, and the isolation margin becomes larger), and if the donor is multi-channel, the isolation margin obtained (assumed isolation margin) will remain unchanged; according to the above differences, it can be Separate them.

3.6. Due to the impact of test accuracy, you can consider avoiding Ec/Io data lower than -20dB (only for evaluation, and credible data higher than this value), and the Ec/Io of the main multipath is less than -6dB When the Ec/Io value of the feedback is relatively low, you can use filtering and smoothing techniques or reduce the isolation margin (temporarily drop to 10dB, etc.), when the Ec/Io of the main multipath is greater than -6dB (add 1dB of feedback The difference is -5dB) and then conduct a precise measurement (the isolation margin is greater than 15dB).

3.7. Calculation and derivation

As shown in Figure 1, the superposition of the donor signal and the feedback signal makes the total energy increase Io becomes larger, but the component energy values of each pilot frequency are not superimposed, because the time scale is different, and the Ec/Io relative to each pilot frequency changes. Small (the total energy increases and Io becomes larger), the difference (log value) between the main pilot and the feedback pilot is equal to the isolation margin; that is, the difference between the main pilot and the feedback pilot's Ec/Io (the premise at the same time ).

Pd = donor signal; Pdp = donor pilot signal; Pr = feedback signal; Prp = feedback pilot signal; Pout = repeater output signal; N = Ec/Io of the main pilot at Pin; M = feedback at Pin Ec/Io of pilot frequency; G=repeater gain; L=isolation margin; I=repeater isolation; units are dB or dBm.

Then: the total input signal of the repeater Pin=10log(10 ^Pd/10 +10 ^pr/10 ) Since the feedback can be circulated infinitely, we only count one feedback (when I is greater than G and higher than 10dB, the latter will be more and more small, ignore)

Pout＝Pin+G

Pr＝Pout-I＝(Pin+G)-I

Prp=(Pdp+G)-I

N=Pdp-Pin

M=Prp-Pin=(Pdp+G)-I-Pin=N-(I-G)

N-M=I-G=L Combine the above two formulas to get

That is: the pilot Ec/Io of the main path-the pilot Ec/Io of the multi-pass feedback=isolation margin

Description of monitoring principle:

Multipath signal superposition principle:

Due to insufficient isolation margin, the wireless repeater mixes the amplified signal into the received donor signal, which conforms to the signal mixing principle: the total received signal entering the machine is equal to the energy superposition of the donor signal and the feedback signal

Total signal (input) = donor signal + feedback signal (energy superposition principle)

Isolation margin = isolation - repeater gain (log value)

Feedback signal = repeater output - isolation = (total signal (input) + repeater gain) - isolation (log value)

Isolation margin = total signal (input) - feedback signal (log value) (derived from the above two formulas)

Feedback pilot = donor pilot + repeater gain - isolation (log value)

Donor pilot - feedback pilot = isolation - repeater gain = (donor pilot - total signal) - (co-fed pilot - total signal) = Ec/Io of the main path - Ec/Io of feedback = Isolation margin (change from the above formula) (log value)

Example 1: Suppose the isolation margin = 15dB, and the donor signal is uniformly 0dBm

Total signal energy = donor energy + feedback energy = 0dBm energy + (-15dB total signal energy) the total signal ≈ 0.1dBm, which is 0.1dB higher than the donor signal

That is, the main Ec/Io is 0.1dB worse than that of the donor (the pilot frequency of the donor is reduced by 0.1dB)

That is, the main Ec/Io in the total signal = the main Ec/Io from the donor - 0.1

In the same way, it can be concluded that the main frequency after feedback = main Ec/Io in the total signal + repeater gain - isolation = (-isolation margin) + Ec/Io-0.1 from the donor Note: Ignore the secondary feedback signal

Assumption: Ec/Io=-5dB of the donor, then the main Ec/Io in the total signal=-5-0.1=-5.1dB

Then the feedback multipath Ec/Io=-5-0.1-15=-20.1dBm

Calculated by the CPU: Isolation margin = main Ec/Io in the total signal - Ec/Io of feedback pilot multipath = -5.1-(-15.1) = 15dB

Example 2: Isolation margin = 10dB, the donor signal is uniformly 0dBm

Total signal = donor energy + feedback energy = 0dBm energy + (-10dB total signal energy) to obtain a total signal ≈ 0.4dBm, which is 0.4dB more than the donor

That is, the main Ec/Io is 0.4dB worse than that of the donor (all pilots from the donor are reduced by 0.4dB)

That is, the main Ec/Io in the total signal=-0.4+the main Ec/Io from the donor

In the same way, it can be concluded that the main frequency after feedback = main Ec/Io in the total signal + repeater gain - isolation = (-isolation margin) + Ec/Io-0.1 from the donor Note: Ignore the secondary feedback signal

Assumption: donor's Ec/Io＝-5dB main Ec/Io＝-5.4dB in the total signal

Ec/Io of feedback multipath=-0.4-5-10=-15.4dBm

Calculated by the CPU: Isolation margin = main Ec/Io in the total signal - multipath Ec/Io of feedback = -5.4-(-15.4) = 10dB

Note: The test method uses multi-path data. When the donor path from the base station to the receiving antenna of the repeater contains the same delay difference as the repeater system isolation margin (when the delay value is the same) When the parallel load/interference ratio of multipath signals is relatively large, the system cannot distinguish the multipath that is the isolation margin, and the system loses accuracy. To consider avoiding this sensitive multipath, or change the direction of the donor antenna, or change the lobe of the donor antenna, etc.); if the multipath signal received by the donor is ahead of the main path and the delay difference with the main path is equal to The delay difference of the station system isolation feedback, and when the signal load/interference ratio is relatively large, the feedback will be superimposed on the main path signal after the feedback, which will change the value of the main path load/interference ratio, and will also make The measurement data is inaccurate (change the direction of the donor antenna, or change the lobe of the donor antenna, etc., to eliminate this sensitive multipath); in addition, because the downlink power load of the wireless communication system changes with the user's situation, that is, the base station That is, the source Ec/Io will also change, so the Ec/Io of the received main path will also change, and the Ec/Io of the multipath feedback will also change. Note that when the multipath load/interference ratio of the feedback ( When the Ec/Io) is close to the demodulation bottom limit, the error of the data obtained will become larger, and the processing program should pay attention to the monitoring sensitivity (such as filtering and smoothing) of the multipath signal when the load/interference ratio is low; the calculation of the isolation margin is only suitable for Between a group of pilot multipaths obtained at the same time (otherwise, after the power of the base station changes, the Ec/Io of the base station also changes, which is not comparable before and after); pay attention to data smoothing and filtering. In addition, when the number of multipaths of the repeater system directing the main pilot is too large, it is also unfavorable for the demodulation of the user's mobile phone in the repeater coverage area (and the Ec/Io value of the main path pilot is declining, reducing the available dynamic range for monitoring), This system can give and display the number and size of the multi-path of the donor main frequency of the receiving signal at the installation point of the repeater (through OMT, that is: the repeater operating software), which is used to assist in adjusting the donor receiving system of the repeater (to get the best source signal). When the main path of the donor has multiple pilot multipaths with similar carrier/interference ratios (Ec/Io), the software should use each pilot main path as the reference time scale to judge whether there is multipath feedback or not. path, the processing is more complicated, and attention should also be paid to avoiding the part that conflicts with the feedback time window.

Repeater isolation test data

The system simulation test is shown in Figure 6:

1. Analysis of test data without positive feedback

2005-09-30 16:29:58.654 0x4003 WCDMA Finger Info for TA

Tx Pos(Cx8) ＝Not Valid(0xffff ffff)

Coherent Integration Length ＝1792

Non-Coherent Integration Length ＝1

Number of Paths = 2

Path[0]:

Ec/Io = -3.9678

Position(Cx8) ＝234887

PSC and SSC = (21, 0)

SSC of Primary CPICH ＝0

Primary CPICH OVSF ＝0

Finger index ＝0

Path[1]:

Ec/Io = -19.0338

Position(Cx8) ＝234875

PSC and SSC = (21, 0)

SSC of Primary CPICH ＝0

Primary CPICH OVSF ＝0

Finger index = 1

Test result statistics: Path[0]: Ec/Io -3.9678dB Path[1]: Ec/Io -19.0338dB

Number of Fingers ＝2

Finger[0]:

Finger ID = 0

Lock Status = 0x0f

TPC Combiner ID ＝0

Position(Cx8) ＝234889

Finger assigned state ＝0[Assigned to active set]

Finger state ＝0[Newly assigned finger]

CPICH divetsity indicator ＝YES

CPICH Ec/Io(primary) ＝-4.93dB

CPICH Ec/Io(diversity) ＝-31.69dB

CPICH Ec/Io(total) ＝-4.92dB

Scrambling Code(prim) ＝21

Chan(OVSF)Code ＝0

Finger[1]:

Finger ID = 1

Lock Status = 0x0f

TPC Combine ID ＝0

Position(Cx8) ＝234876

Finger assigned state ＝0[Assigned to active set]

Finger state ＝0[Newly assigned finger]

CPICH diversity indicator ＝YES

CPICH Ec/Io(primary) ＝-20.44dB

CPICH Ec/Io(diversity) ＝-30.48dB

CPICH Ec/Io(total) ＝-20.03dB

Scrambling Code(prim) ＝21

Chan(OVSF)Code ＝0

Test result statistics: Finger[0]: CPICH Ec/Io(primary) -4.93dB Finger[1]; CPICH Ec/Io(primary) -20.44dB

From the test data, it can be analyzed that the multipath delay corresponding to the phase difference between finger[0] and finger[1] is 0.423 μs. It is certain that finger[0] is the pilot multipath on the donor path of finger[1].

2. Test data analysis when the positive feedback is weak 4dB

Test result statistics: Path[0]: Ec/Io -5.9725dB Path[1]: Ec/Io -10.1561dB Path[2]: Ec/Io -13.7518dB

Test result statistics: Finger[0]: CPICH Ec/Io(primary) -7.23dB Finger[1]: CPICH Ec/Io(primary) -11.26dB Finger[2]: CPICH Ec/Io(primary) -14.77dB

From the test data, it can be analyzed that the pilot multipath delay corresponding to the phase difference between finger[0] and finger[1] is 3.678μs. It is certain that finger[1] is the positive feedback of finger[0] to the mobile phone after the repeater The received pilot multipath; the multipath delay corresponding to the phase difference between finger[2] and finger[1] is 3.776μs, it is certain that finger[2] is the positive feedback of finger[1] to the mobile phone after the repeater Received pilot multipath;

3. Test data analysis when the positive feedback is weak at 9.5dB

=======================================

2005-09-30 16:35:05.249 0x4003 WCDMA Finger Info for TA

Tx Pos(Cx8) ＝Not Valid(0xffff ffff)

Coherent Integration Length ＝1792

Non-Coherent Integration Length ＝1

Number of Paths = 2

Path[0]:

Ec/Io = -3.8107

Position(Cx8) ＝249716

PSC and SSC = (21, 0)

SSC of Primary CPICH ＝0

Primary CPICH OVSF ＝0

Finger index ＝0

Path[1]:

Ec/Io = -13.2522

Position(Cx8) ＝249828

PSC and SSC = (21, 0)

SSC of Primary CPICH ＝0

Primary CPICH OVSF ＝0

Finger index = 1

Test result statistics: Path[0]: Ec/Io -3.8107dB Path[1]: Ec/Io -13.2522dB

Number of Fingers = 2

Finger[0]:

Finger ID = 0

Lock Status = 0x0f

TPC Combiner ID ＝0

Position(Cx8) ＝249717

Finger assigned state ＝0[Assigned to active set]

Finger state ＝0[Newly assigned finger]

CPICH diversity indicator ＝YES

CPICH Ec/Io(primary) ＝-5.58dB

CPICH Ec/Io(diversity) ＝-31.04dB

CPICH Ec/Io(total) ＝-5.57dB

Scrambling Code(prim) ＝21

Chan(OVSF)Code ＝0

Finger[1]:

Finger ID = 1

Lock Status = 0x0f

TPC Combiner ID ＝0

Position(Cx8) ＝249831

Finger assigned state ＝0[Assigned to active set]

Finger state ＝0[Newly assigned finger]

CPICH diversity indicator ＝YES

CPICH Ec/Io(primary) ＝-14.30dB

CPICH Ec/Io(diversity) ＝-31.04dB

CPICH Ec/Io(total) ＝-14.21dB

Scrambling Code(prim) ＝21

Chan(OVSF)Code ＝0

Test result statistics: Finger[0]: CPICH Ec/Io(primary) -5.58dB Finger[1]: CPICH Ec/Io(primary) -14.30dB

From the test data, it can be analyzed that the pilot multipath delay corresponding to the phase difference between finger[0] and finger[1] is 3.7109357μs. It is certain that finger[1] is the positive feedback of finger[0] to the mobile phone after the repeater Received pilot multipath. The calculation of the delay difference is (Position(Cx8) of finger[1])-(Position(Cx8) of finger[0])=114 Position(Cx8)=114*(1/(3.84*10 ⁶ *8)) =3.7109357*10 ^-6 seconds

4. Test data analysis when the positive feedback is weak 14.5dB

Test result statistics: Path[0]: Ec/Io -4.3334dB Path[1]: Ec/Io -18.0733dB Path[2]: Ec/Io -18.4658dB

Test result statistics: Finger[0]: CPICH Ec/Io(primary) -5.15dB Finger[1]: CPICH Ec/Io(primary) -19.78dB Finger[2]: CPICH Ec/Io(primary) -18.80dB

From the test data, it can be analyzed that the pilot multipath delay corresponding to the phase difference between finger[2] and finger[0] is 3.6783μs. It is certain that finger[2] is the positive feedback of finger[0] to the mobile phone after the repeater Received pilot multipath.

Note: The delay difference is calculated as (Position(Cx8) of finger[1])-(Position(Cx8) of finger[0])=114Position(Cx8)=114*(1/(3.84*106*8))≈ 3.71*10-6 seconds

Claims (3)

1. method of utilizing pilot tone multi-path signal monitoring wireless repeater isolation, it is characterized in that: this method mainly comprises the steps:

1.1), read the process data of the inside searcher of the built-in monitoring module of radio repeater system, i.e. the data value of a plurality of multipath pilot signals of receiving of receiver, this data value comprises carrier/interface ratio and timescale data;

1.2), calculate the carrier/interface ratio of wireless discharging-directly station main path pilot signal and the pilot tone carrier/interface ratio of repeater feedback multipath signal, the pilot tone carrier/interface ratio of above-mentioned repeater feedback multipath signal comprises time window constraint;

1.3), calculate direct discharging station isolation surplus, the pilot tone carrier/interface ratio of isolation surplus=main path pilot signal carrier/interface ratio-feedback multipath signal;

Wherein, carry out the method for detecting isolation between of repeater by the isolation surplus, concrete steps are as follows: after reading one group of multipath pilot signal by the monitoring repeater module, find earlier the carrier/interface ratio maximum the main path pilot signal and with this signal the time be designated as time point location, find out to be equivalent to whether have in the time delay window that the repeater time delay adds antenna feeder coupling path time delay another or a plurality of multipath pilot signal after this time;

If A has a multipath pilot signal, then this multipath pilot signal carrier/interface ratio and main path pilot signal carrier/interface ratio are compared, if this difference, promptly present actual isolation surplus is greater than isolation surplus set point, then system is safe; If this difference is less than set point, then need to get rid of whether this identical multipath pilot signal is arranged on the main path, method is to test once again after reducing the repeater gain, promptly reduce after the gain again the multipath pilot signal carrier/interface ratio value in the time for reading window, and compare with the main path pilot signal of this moment; What proof recorded if its difference becomes big in proportion is the isolation surplus, need take measures to prevent the generation of self-excitation; As not changing this multipath pilot signal then is multipath pilot signal on the main RX path, recovers former gain back and continues to detect; If its difference changes and change in gain is not to change in proportion, eliminate this responsive multipath signal, need to continue monitoring;

If no multipath pilot signal in the B time window, then system's isolation surplus is on detection sensitivity, and promptly the isolation surplus is fine;

If C has a plurality of qualified multipath pilot signals, compare with the main path pilot signal again after then should being converted into the power addition to a plurality of qualified multipath pilot signals; Ask for the isolation surplus again.

2. the method for utilizing pilot tone multi-path signal monitoring wireless repeater isolation according to claim 1, it is characterized in that: if its difference changes and change in gain is not to change in proportion, then many on isolation residual signal and the alms giver's RX path mix through signal, by changing the direction of direct discharging station time delay or change donor antenna, or the lobe of change donor antenna, to eliminate this responsive multipath signal.

3. the method for utilizing pilot tone multi-path signal monitoring wireless repeater isolation according to claim 1, it is characterized in that: behind step C, increase following steps: the energy of trying to achieve the pilot energy and the feedback pilot tone of main path earlier, and respectively repeatedly accumulation try to achieve smooth value and measure the randomness error to eliminate part, get the dBm scale value of the logarithm value of energy again, try to achieve the isolation surplus again, the dBm scale value of the smooth value of the energy of the dBm scale value-feedback multipath signal of the smooth value of the energy of isolation surplus=main path pilot signal; Wherein the computational methods of the pilot energy of feedback multipath signal are as follows: the multipath pilot signal that provides by the monitoring repeater module, find earlier the carrier/interface ratio maximum the main path pilot signal and with this signal the time be designated as time point location, find out begin time from the time point of this location through being equivalent to the repeater time delay after, in the time delay window of the antenna feeder coupling path time delay that is provided with whether one or more multipath pilot signals are arranged, and the some multipath pilot signals in this time delay window are converted into the pilot power of trying to achieve described repeater feedback multipath signal after the power addition.

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