KR19990054733A - Transmitting signal attenuation adjustment method and transceiver - Google Patents

Abstract

The present invention relates to a method for adjusting attenuation of a transmission signal of a transceiver and a transceiver.

A method for accurately attenuating and adjusting a transmission signal of a transceiver according to the present invention includes manufacturing an XCVR with hardware conditions, operating the XCVR normally, changing a transceiver attenuation level by an operator, and a target transceiver attenuation. Receiving a level through a path below BSM and setting the transceiver attenuation level, comparing a transceiver attenuation level received from a higher level to a current transceiver attenuation level, and if the level received from a higher level is greater than or equal to a current level, Blossoming Performing a process, and performing a Wilting function if a level received from an upper level of the comparison result is smaller than a current level.

The transceiver according to the present invention includes a transceiver auxiliary control board (XSCB), a first frequency converter and an attenuator, inputs a transceiver interface signal, is connected to the XSCB, and outputs a transceiver RF signal. And a reception frequency down conversion board (DCRB) and an XCVU for inputting the high frequency reception signals RF_0 and RF_1 and outputting them as receiver interface signals IF_0 and IF_1 through a second frequency converter provided therein.

According to the present invention, since the relative difference between the maximum output value of the sampling channel and the frequency band channel corresponding to each channel, that is, the channel offset, is adjusted and compensated for adjusting the level of the transmission signal in the transceiver, more accurate transmission signal attenuation level control is achieved without error. It can be made up to 0.1 decibel unit. In addition, according to the step period, it is possible to perform the blumming and wilting functions. Therefore, in terms of the performance of the CDMA and PCS systems, when a new cell is added or removed, the neighboring cell is suddenly increased or decreased. Since the handoff can be performed without increasing the noise or disconnecting the call, the system performance is improved.

Description

Transmitting signal attenuation adjustment method and transceiver

The present invention relates to a transmission signal attenuation adjustment method and a transceiver of a transceiver. In particular, the present invention relates to a method of more accurately adjusting the attenuation of a transmission signal (Tx Atten.) In adjusting the output magnitude of a signal when a signal is transmitted from a transceiver unit of a mobile phone base station system.

In the transceiver of the conventional mobile phone base station system, the output signal size adjustment is performed through a power variable circuit inside the transceiver. Therefore, in the related art, the magnitude of the signal output is adjusted by applying a control voltage corresponding to the power variation to be adjusted to the attenuator.

At this time, the control voltage applied to the attenuator is the output voltage that is input and processed by the DAC when the digital to analogue converter (DAC) input value corresponding to the attenuation value to be adjusted is actually obtained and written to a specific address. This output voltage was applied to the control terminal of the attenuator through an appropriate path to adjust the magnitude of the signal.

The DAC input value pointed out above is measured and calculated in hardware according to the amount of attenuation of the transmission signal and stored in the EEPROM (Electrically erasable and programmable read only memory) in the transceiver.

At this time, the DAC input value stored in the EEPROM is measured only in consideration of the frequency environment corresponding to any one channel in the corresponding transceiver. Therefore, the size of the output actually depends on the characteristics of the corresponding frequency band of each channel and the characteristics of the individual transceiver. Due to the error caused by the change, the magnitude of the actual signal output is somewhat inaccurate. Therefore, the control of the output size of the transmission signal by the DAC value for each transmission signal attenuation level of the EEPROM measured and stored only for an arbitrary channel environment has a limitation in its accuracy.

Accordingly, an object of the present invention is to provide a transceiver and a method for adjusting transmission signal attenuation of a transceiver in order to solve the above problems.

1 is a block diagram of a transceiver

2 is a flowchart illustrating transceiver operation and control messages.

3 is an algorithm for controlling attenuation of a transceiver signal

4 is a method diagram for adjusting to a particular transmitter attenuation level.

5 is an operation diagram according to the present invention

One preferred embodiment of the method for accurately attenuating and adjusting the transmission signal of the transceiver according to the present invention for achieving the above object,

Manufacturing the XCVR with hardware conditions;

Operating the XCVR normally;

The operator changing the transceiver attenuation level;

Receiving a target transceiver attenuation level through a path below BSM and setting the transceiver attenuation level to the transceiver attenuation level;

Comparing a transceiver attenuation level received from a higher level with a current transceiver attenuation level;

Performing a blossoming process if the level received from the comparison result is greater than or equal to the current level;

And performing a Wilting function if the level received from the comparison result is smaller than the current level.

In the present invention, the change of the attenuation level is preferably performed through the input of the attenuation level command,

To adjust the transceiver attenuation level to a specific transceiver attenuation level,

Accessing the transceiver attenuation level table of the EEPROM to obtain a corresponding DAC input value and setting the value to Att_level;

Accessing a channel offset table of the EEPROM to obtain a channel offset for the current channel and setting the channel offset to a Ch_Offset value;

Setting the dac_value by adding the Att_level value and the Ch_Offset value;

Preferably, the dac_value value is written to a specific address input to a DAC.

The step of providing the hardware condition,

Setting a sampling channel in an EEPROM in an XSCR having a central processing unit of a transceiver;

One-to-one calculation and storage of DCA input values corresponding to transceiver attenuation levels for the channel for each individual XCVR;

Obtaining a relative difference between the sampling channel and the output of each channel; And

It is preferable to include a step of constructing a channel offset table using the relative difference and to store in the EEPROM,

Normally operating the XCVR,

Mounting the XCVR in a base station system to supply power;

Executing the XSCB ROM;

Loading a program for operating and controlling the XCVR into the RAM of the XSCB according to a message flow path from the BSM;

Receiving a configuration message and setting the channel and controlling the output accordingly;

The transceiver attenuation level change process,

Inputting a target transceiver attenuation level from the BSM as a parameter of a transceiver attenuation level change command; And

It is preferable to have a step of inputting steps and periods together for stepwise adjustment,

The unit of the step is preferably 0.1 decibels,

It is preferable that the unit of the peeriode is second,

When performing the blossoming process, it is preferable to increase by the step level in the period of the Peoride time until the target transceiver attenuation level,

When the Wilting process is performed, it is preferable to decrease the step level by the step level until the target transceiver attenuation level is reached,

The dac_value is preferably in the range of 0 to 4095,

The dac_value input to the DAC is preferably converted into a voltage of 0 to 5 volts and applied to the control terminal of the attenuator in the TUCB through an appropriate path.

The transceiver interface signal is attenuated by a voltage applied to a control terminal through the attenuator of the TUCB, and is preferably converted into a transceiver RF signal having a desired transceiver attenuator level and outputted.

The interface signal is preferably 4.95 MHz,

Transceiver high-frequency signals in the 1840-1870 MHz band through the attenuator into 600 sampling channels of 50 kHz, measure the difference from the sampling channel when the attenuation level of the transmission signal in each sampling channel is maximized, and measure the difference in the EEPROM. It is desirable to store.

One preferred embodiment of the transceiver according to the present invention for achieving the above another object,

Transceiver auxiliary control board (XSCB);

A transmission frequency rising conversion board (TUCB) having a first frequency converter and an attenuator, inputting a transceiver interface signal, connected to the XSCB, and outputting a transceiver RF signal;

Receiving frequency dropping conversion board (DCRB) for inputting high frequency reception signals RF_0, RF_1 and outputting the receiver interface signals IF_0, IF_1 through a second frequency converter provided therein;

Contains XCVU.

In the present invention, the transceiver auxiliary control board is preferably provided with a ROM, RAM, CPU EEPROM, DAC and I / O,

The transceiver interface signal is preferably 4.95MHz,

The receiver interface signal is preferably 4.95MHz,

The transceiver RF signal is preferably 1840 ~ 1870MHz,

The high frequency reception signal is preferably 1750 ~ 1780MHz,

Preferably, the first frequency converter converts 4.95 MHz to 1.8 GHz.

Preferably, the second frequency converter converts 1.7 GHz into 4.95 MHz.

One channel space is preferably 50KHz,

The transceiver RF signal is preferably divided into 600 channels.

According to the present invention, a random sampling channel is determined according to each transmitter attenuation level, and the relative difference of the DAC input value at the maximum output of the sampling channel for each channel is measured and stored in the EEPROM. Compensation by the offset reduces the error in the prior art and enables the output power of the transceiver in 0.1dB increments. In addition, the step-by-step power adjustment is possible to gradually increase and decrease the output power of the transceiver, thereby enabling more accurate control in adjusting the attenuation of the transmission output in the transceiver.

EEPROM which divides the transceiver high frequency signal of 1840 ~ 1870MHz band through attenuator into 600 sampling channels of 50㎑ and measures the difference with sampling channel when the attenuation level of transmission signal in each sampling channel is maximized. Electrically erasable and programmable read only memory.

In the EEPROM of the transceiver auxiliary control board, the DAC input value of the sampling channel for each transmitter attenuation level is measured and stored. In the present invention, the transmitter attenuation levels are set to 600 to 0 (-60.0 dB to -0.0 dB), 900 to 999 (+0.0 dB to + 9.9 dB), and the sampling channel number is set to 100. Obtained and stored in EEPROM. In addition, the difference (channel offset) between the sampling channel and the maximum output is calculated and stored in the EEPROM according to each channel.

Under these hardware conditions, a method of adjusting the transmitter attenuation level by the software controlling the transceiver will be described with reference to FIGS. 3, 4, and 5 as follows:

A first step in which an operator inputs a target transmitter attenuation level value through a base station manager (BSM);

Obtaining a digital-to-analog converter (DAC) input value corresponding to a predetermined transmission signal attenuation level in an EEPROM;

Obtaining a channel offset for the current channel in the EEPROM;

A fourth step of compensating for the channel offset to the DAC input value of the corresponding transmission signal attenuation value; And

And a fifth step in which the obtained final DAC input value is input to the DAC and the output voltage is applied to the transmission signal attenuator.

When the transceiver is manufactured in the base station system and the power is supplied, the transceiver auxiliary control board ROM is executed, and a program for operating and controlling the transceiver is loaded from the base station management system into the transceiver auxiliary control board RAM according to the message flow chart of FIG. loading), and receive configuration messages to control channel settings and outputs accordingly.

As described above, when the transceiver is in normal operation, the target attenuation level is input from the base station management system as a parameter of the transmitter attenuation level change command in order to adjust the transmitter attenuation, and steps and periods are input for stepwise adjustment. Where the steps are in 0.1 dB units and the period is in seconds.

A preferred method for adjusting the input specific transmitter attenuation level is described with reference to FIG. 4 as follows:

Obtaining a corresponding DAC input value (Att_level) by accessing a transmission signal attenuation level table of the EEPROM;

Obtaining a channel offset (Ch-Offset) for the current channel by accessing the channel offset table of the EEPROM;

A third step of obtaining a dac_value by adding an Att_level value and a Ch_Offset value; And

A channel offset compensation method including a fifth step of writing dac_value to a specific address input to the DAC is used.

According to the above algorithm, the transmitter intermediate frequency signal inputted to the transmission frequency rising conversion board is attenuated by the transmitter attenuation level through the attenuator and output as a signal of the corresponding frequency band.

Referring to Figure 5 how the dac_value obtained by the above algorithm is applied to the attenuator to operate,

When the DAC input value in the range of 0 ~ 4095 is written to a specific address, it is input to the DAC in the transceiver auxiliary control board and converted to the output voltage between 0 ~ 5V in the DAC to the control terminal of the attenuator in the transmission frequency rising conversion board through the proper path. Will be added.

Transmitter intermediate frequency signal of 4.95MHz is attenuated by the voltage applied to the control terminal through the attenuator of the transmitting frequency rising conversion board and converted into the transmitter high frequency signal of the desired transmitter attenuation level size.

According to the present invention operating as described above, since the relative difference between the maximum output value of the sampling channel and the frequency band channel corresponding to each channel, that is, the channel offset, is adjusted and compensated for adjusting the level of the transmission signal in the transceiver, more accurate transmission without error. Signal attenuation levels can be adjusted up to 0.1 decibels. In addition, according to the step period, it is possible to perform the blumming and wilting functions. Therefore, in terms of the performance of the CDMA and PCS systems, when a new cell is added or removed, the neighboring cell is suddenly increased or decreased. Since the handoff can be performed without increasing the noise or disconnecting the call, the system performance is improved.

Claims (25)

Manufacturing the XCVR with hardware conditions; Operating the XCVR normally; The operator changing the transceiver attenuation level; Receiving a target transceiver attenuation level through a path below BSM and setting it to the transceiver attenuation level; Comparing a transceiver attenuation level received from a higher level with a current transceiver attenuation level; Performing a blossoming process if the level received from the comparison result is greater than or equal to the current level; And performing a Wilting function when the level received from the upper level is smaller than the current level as a result of the comparison. 2. The method of claim 1 wherein the changing of the attenuation level is effected through input of an attenuation level command. The method of claim 1, wherein the transceiver attenuation level is adjusted to a specific transceiver attenuation level, Accessing the transceiver attenuation level table of the EEPROM to obtain a corresponding DAC input value and setting the value to Att_level; Accessing a channel offset table of the EEPROM to obtain a channel offset for the current channel and setting the channel offset to a Ch_Offset value; Setting the dac_value by adding the Att_level value and the Ch_Offset value; And writing the dac_value value to a specific address input to a DAC. The method of claim 1, wherein the step of providing the hardware condition is: Setting a sampling channel in an EEPROM in an XSCR having a central processing unit of a transceiver; One-to-one calculation and storage of DCA input values corresponding to transceiver attenuation levels for the channel for each individual XCVR; Obtaining a relative difference between the sampling channel and the output of each channel; And Constructing and storing a channel offset table in the EEPROM using the relative difference. The method of claim 1, wherein the normal operation of the XCVR, Mounting the XCVR in a base station system to supply power; Executing the XSCB ROM; Loading a program for operating and controlling the XCVR into the RAM of the XSCB according to a message flow path from the BSM; Receiving a configuration message and setting up a channel and controlling the output accordingly. The method of claim 2, wherein the transceiver attenuation level change process, Inputting a target transceiver attenuation level from the BSM as a parameter of a transceiver attenuation level change command; And And inputting steps and periods together for stepwise adjustment. 7. The method of claim 6, wherein the unit of step is 0.1 decibels. 7. The method of claim 6, wherein the unit of peerion is seconds. 10. The method of claim 8, wherein in performing the Blossoming process, the step is increased by the step level in the Peoride time interval until the target transceiver attenuation level is reached. 9. A method according to claim 8, wherein the step of decreasing the transceiver level by said step level at said Peoriod time interval until said target transceiver attenuation level is reached during the Wilting process. 4. The method of claim 3 wherein the dac_value is in the range of 0 to 4095. 12. The method of claim 11, wherein the dac_value input to the DAC is converted to a voltage of 0-5 volts and applied to the control terminal of the attenuator in the TUCB via an appropriate path. The transceiver of claim 12, wherein the transceiver interface signal is attenuated by a voltage applied to a control terminal via an attenuator of the TUCB, and is converted into a transceiver RF signal having a desired size of the transceiver attenuator level. How to adjust the attenuation level. 14. The method of claim 13, wherein the interface signal is 4.95 MHz. 2. The method of claim 1, wherein the transceiver high frequency signal of the 1840-1870 MHz band through the attenuator is divided into 600 sampling channels of 50 Hz, and the difference from the sampling channel when the attenuation level of the transmission signal in each sampling channel is maximized. Measuring and storing in the EEPROM. Transceiver auxiliary control board (XSCB); A transmission frequency rising conversion board (TUCB) having a first frequency converter and an attenuator, inputting a transceiver interface signal, connected to the XSCB, and outputting a transceiver RF signal; Receiving frequency dropping conversion board (DCRB) for inputting high frequency reception signals RF_0, RF_1 and outputting the receiver interface signals IF_0, IF_1 through a second frequency converter provided therein; A transceiver, comprising an XCVU. 17. The transceiver of claim 16 wherein the transceiver auxiliary control board includes a ROM, RAM, CPU EEPROM, DAC, and I / O. 17. The transceiver of claim 16 wherein the transceiver interface signal is 4.95 MHz. 17. The transceiver of claim 16 wherein the receiver interface signal is 4.95 MHz. 17. The transceiver of claim 16 wherein the transceiver RF signal is between 1840 and 1870 MHz. 17. The transceiver of claim 16 wherein the high frequency received signal is between 1750 and 1780 MHz. 17. The transceiver of claim 16 wherein the first frequency converter converts 4.95 MHz to 1.8 GHz. 17. The transceiver of claim 16 wherein the second frequency converter converts 1.7 GHz to 4.95 MHz. The transceiver of claim 16 or 20, wherein one channel space is 50 KHz. 23. The transceiver of claim 22 wherein the transceiver RF signal is divided into 600 channels.