CN101931451A - Self-excitation processing method for repeater - Google Patents

Abstract

The invention relates to a self-excitation processing method for a repeater, which comprises the following steps of: 1, circularly acquiring self-excitation relevant parameters of uplink and downlink by taking certain time as a period; 2, judging whether a system is subjected to frequent self-excitation or not by judging the acquired self-excitation relevant parameters and using the ratio of the times when an indication system is in a self-excitation state to the total acquisition times or using the times when a self-excitation relevant parameter continuous indication system is in the self-excitation state; and 3, adjusting the gain of the repeater and simultaneously reducing the uplink and downlink gains of the system by a certain numerical value after determining that the system is subjected to frequent self-excitation. The self-excitation processing method for the wireless repeater can provide an isolation measuring function and one self-excitation relevant parameter. The intelligent processing of self-excitation is mainly that: after the self-excitation principle is deeply studied, the self-excitation of the system is avoided and an optimal working condition is realized by using interrelation of the gain and isolation and controlling the increase and decrease of the gain under the condition that the isolation is changed.

Description

The self-excitation processing method of repeater

Technical field

The present invention relates to a kind of self-excitation processing method of wireless discharging-directly station, this repeater can provide isolation measurement function and self-excitation relevant parameter.

Background technology

In traditional radio repeater system, because donor antenna and retransmitting antenna inevitably are coupled, the isolation of two antennas is limited, is easy to take place self-excitation in project installation.Generally require the isolation of two antennas to gain more than the big 15dB than the repeater in the practical engineering application, only in this way, the work of equipment is just more stable, but has so also increased the engineering workload, has caused the inconvenience of engineering construction.

In recent years, people had worked out the multiple technology that feedback interference is eliminated function that has again, had made the wireless discharging-directly station that has these technology, can reduce system's self-excitation possibility greatly.But this only is the allowance (isolation deducts the value that gain obtains) that has enlarged system's self-excitation, when system's self-excitation under extreme conditions, does not also have corresponding techniques to adjust processing effectively.

Summary of the invention

The object of the present invention is to provide a kind of self-excitation processing method of wireless discharging-directly station, the Intelligent treatment when having realized direct discharging station self-excitation under extreme conditions.

The self-excitation processing method of repeater of the present invention is characterized in that: may further comprise the steps:

First handling process is the reduction about gain, meeting when monitoring straight-forward station self-excitation:

Step 1 is the self-excitation relevant parameter that loop cycle is gathered uplink downlink with the regular hour;

Step 2 collects the self-excitation relevant parameter by judgement, and the number of times that utilizes indication mechanism to be in the self-excitation state accounts for the ratio of total times of collection, perhaps utilizes the continuous indication mechanism of self-excitation relevant parameter to be in the number of times of self-excitation state, judges whether system is regular self-excitation;

Step 3 after the affirmation system is regular self-excitation, is adjusted the gain of repeater, and system's up-downgoing gain is reduced certain numerical value simultaneously; And note this moment up-downgoing isolation Ise and the difference Ase of actual gain and artificial set point; Otherwise skips steps 3 enters step 4;

Whether step 4 is that the relevant parameter of regular self-excitation returns to initial value being used for the affirmation system in the step 2.After finishing, operation returns step 1, circular treatment.

Second handling process is about the increase of gain, meeting when monitoring straight-forward station self-excitation:

Step 1 is the isolation parameter that loop cycle is gathered uplink downlink with the regular hour;

Step 2 is handled respectively uplink downlink, and computing is also write down isolation parameter I rt at N continuous relative minimum value Iincmin of improving of Ise and obtain the employed Irt of this Iincmin in the cycle;

Step 3, if the Iincmin that obtains in the step 1 for greater than zero on the occasion of, just go to increase system's up-downgoing gain on the occasion of the result, give Ise with obtaining the employed Irt assignment of this Iincmin with what Ase deducted that Iincmin obtains, with Ase deduct that Iincmin obtains on the occasion of assignment as a result to Ase; If the Iincmin that obtains in the step 2 be non-on the occasion of or Ase deduct Iincmin obtain non-on the occasion of do not increase the gain and the operation of above-mentioned twice assignment, enter step 4;

Step 4 returns to initial value being used to obtain the isolation relevant parameter of minimum value Iincmin that improves in the step 2; After finishing, operation returns step 1, circular treatment.

The prerequisite that the self-excitation processing method function of wireless discharging-directly station of the present invention realizes is that this repeater can provide isolation measurement function and a self-excitation relevant parameter.After the intellectuality of self-excitation is handled and mainly is the principle of further investigation self-excitation, utilize the correlation of gain and isolation, under the situation that isolation changes,, make system break away from self-excitation, realize optimum Working by the increase and decrease of ride gain.

Description of drawings:

Fig. 1 is for carrying out the principle of device block diagram of self-excitation Intelligent treatment to uplink downlink.

Fig. 2 is self-excitation handling process (decay and recovery are handled successively).

Embodiment:

Below in conjunction with accompanying drawing, be that (the type repeater provides isolation measurement function and a self-excitation relevant parameter---feedback calibration number of times to example with a kind of gsm wireless repeater.When system's self-excitation, parameter feedback calibration number of times increases), the execution mode of system is as follows.

Read feedback calibration number of times and each channel isolation parameter that up-downgoing feedback interference cancellation module provides with microcontroller MCU by RS-232 interface, control the LNA gain of uplink downlink then, realize Based Intelligent Control straight-forward station self-excitation.Apparatus of the present invention in the repeater the position and correlation module as shown in Figure 1.

The microcontroller handling process adopts the mode to decaying and recovering to handle successively here as shown in Figure 2.

Sign among the figure is done following explanation:

The AutoATT program is to the automatic pad value of gain, and stepping 3dB(is corresponding to the Ase in the summary of the invention)

UpDownlinkFlag up-downgoing self-excitation number of times sign

UpDownlinkIFlag up-downgoing isolation recovers the number of times sign

The up feedback calibration number of times of UplinkCounter, self-excitation once increases by 2

DownlinkCounter downstream feedback calibration number of times, self-excitation once increases by 2

The up feedback calibration number of times that UplinkCounterNew is new

The downstream feedback calibration number of times that DownlinkCounterNew is new

The artificial up pad value that is provided with of UplinkATT

The artificial downstream attenuation value that is provided with of DownlinkATT

The up isolation of UplinkIsolation (corresponding to the Ise in the summary of the invention)

The descending isolation of DownlinkIsolation (corresponding to the Ise in the summary of the invention)

The up isolation that UplinkIsolationNew is new (corresponding to the Irt in the summary of the invention)

The descending isolation that DownlinkIsolationNew is new (corresponding to the Irt in the summary of the invention)

MIN() get the minimum value of numerical value in the bracket

The minimum value of UpDownlinkIChangeMIN up-downgoing isolation change amount may be non-positive number (corresponding to the Iincmin in the summary of the invention)

The minimum value of IsolationChange up-downgoing isolation change amount, positive number

Continuous 5 isolations of IsolationChangeMIN improve in the situation, the minimum change amount of isolation

AutoATTChange is to the amount of recovery of automatic pad value AutoATT

When system self-excitation did not take place, up-downgoing feedback calibration number of times was constant, and pad value AutoATT is zero automatically, operate as normal.

During self-excitation several times, up-downgoing feedback calibration number of times increases once in a while in system, increases thresholding 20 or does not reach continuous self-excitation number of times 3 times but reach the feedback calibration number of times, and pad value AutoATT is zero automatically, operate as normal.

During system regular self-excitation, up-downgoing feedback calibration number of times increases, and reaching the feedback calibration number of times increases thresholding 20 and reach continuous self-excitation number of times 3 times, and pad value AutoATT increases by 3 automatically, and system gain is lowered 3dB subsequently.Be not enough to eliminate self-excitation if reduce 3dB, in circulation next time, also will continue to reduce 3dB, eliminate until system's self-excitation.

After each Adjustment System gain, write down system's isolation at this moment benchmark as a comparison.When isolation continuous 5 times when all big than fiducial value, the self-excitation handling procedure can attempt recovering gain, the minimum value that the size of amount of recovery improves for isolation in these 5 times; Otherwise do not go to recover gain.After recovering gain, that time isolation collection value that obtains the minimum value that isolation improves as new standard of comparison.The recovery of gain promptly returns to the manually value of setting at most only at automatic pad value.

All be a plurality of channels generally in the practical application, and the isolation of these a plurality of channels generally is inconsistent; During change of external conditions, the isolation variable quantity of each channel is also inequality, so will be that time isolation collection value that obtains the minimum value that isolation improves as new standard of comparison, to reduce error.

Said method, the step of two circular treatment flow processs is relatively independent relevant again, can interlock to carry out or successively carry out successively under a stable condition.

The collection of related data and execution unit, and the communication mode of collection/setting can be selected for use flexibly; Controller also can be the various processors that can carry out each step in order, as single-chip microprocessor MCU.

Foregoing; it only is preferred embodiment of the present invention; be not to be used to limit embodiment of the present invention; those of ordinary skills are according to main design of the present invention and spirit; can carry out corresponding flexible and adjustment very easily, so protection scope of the present invention should be as the criterion with the desired protection range of claims.

Claims (2)

1. the self-excitation processing method of a repeater is characterized in that: may further comprise the steps:

Step 1 is the self-excitation relevant parameter that loop cycle is gathered uplink downlink with the regular hour, can judge whether self-excitation of system by this parameter;

Step 2 collects the self-excitation relevant parameter by judgement, and the number of times that utilizes indication mechanism to be in the self-excitation state accounts for the ratio of total times of collection, perhaps utilizes the continuous indication mechanism of self-excitation relevant parameter to be in the number of times of self-excitation state, judges whether system is regular self-excitation;

Step 3 after the affirmation system is regular self-excitation, is adjusted the gain of repeater, and system's up-downgoing gain is reduced certain numerical value simultaneously; And note this moment up-downgoing isolation Ise and the difference Ase of actual gain and artificial set point; Otherwise skips steps 3 enters step 4;

Whether step 4 is that the relevant parameter of regular self-excitation returns to initial value being used for the affirmation system in the step 2, returns step 1, circular treatment after operation is finished.

2. the self-excitation processing method of a repeater is characterized in that: may further comprise the steps:

Step 1 is the isolation parameter that loop cycle is gathered uplink downlink with the regular hour;

Step 2 is handled respectively uplink downlink, and computing is also write down isolation parameter I rt at N continuous relative minimum value Iincmin of improving of Ise and obtain the employed Irt of this Iincmin in the cycle;

Step 3, if the Iincmin that obtains in the step 1 for greater than zero on the occasion of, just go to increase system's up-downgoing gain on the occasion of the result, give Ise with obtaining the employed Irt assignment of this Iincmin with what Ase deducted that Iincmin obtains, with Ase deduct that Iincmin obtains on the occasion of assignment as a result to Ase; If the Iincmin that obtains in the step 2 be non-on the occasion of or Ase deduct Iincmin obtain non-on the occasion of do not increase the gain and the operation of above-mentioned twice assignment, enter step 4;

Step 4 returns to initial value being used to obtain the isolation relevant parameter of minimum value Iincmin that improves in the step 2; After finishing, operation returns step 1, circular treatment.

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