KR20060130403A - Method of automatic gain control in wireless communication device - Google Patents

Abstract

An AGC(Automatic Gain Control) method of a wireless communication terminal is provided to be capable of controlling the amplitude of a delivered signal of a general communication channel so as to become appropriate amplitude, thus location information can be obtained with higher accuracy. A location perceiving function for transceiving a GPS(Global Positioning System) signal is driven in a wireless communication terminal(S101). The power of a delivered signal of a general communication channel in the terminal is detected(S102). The detected power value is compared with a reference power value(103-105). If the detected power value is larger than the reference power value, an AGC value of a transmission stage is reduced to decrease the amplitude of the delivered signal(S106).

Description

Method of automatic gain control in wireless communication device

1 is a flowchart illustrating a process of performing an embodiment of a method for controlling automatic gain of a transmitter in accordance with the present invention.

The present invention relates to automatic gain adjustment of an output signal in a wireless communication terminal, and more particularly, to a method for controlling an output signal of a wireless communication terminal to a certain level when an emergency rescue service is driven.

With the recent rapid development of wireless communication technology and infrastructure, diversity services are performed in wireless communication terminals. In particular, location-based services have become one of the new services.

Location Based Service (Location Based Service) is to provide a variety of additional application services required by the user by combining the location information of the mobile user in real time with various other useful information. Services using location-based services currently provided by wireless communication terminals include location tracking services such as friend finder, friend finder, and map finder.In emergency situations, wireless communication terminals communicate with base stations and satellite navigation devices (hereinafter referred to as 'GPS'). An emergency rescue service ('E911 service'), which finds current location information and transmits it to an emergency rescue center, is an example of location-based services.

When the emergency rescue service is implemented, the wireless communication terminal receives satellite information-related data for driving the positioning function by communication with a normal base station and the like and uses the received data and the GPS function provided therein. The location information obtained from the grasping function is transmitted to the server of the emergency rescue service. The strength of the communication signal received by the terminal varies depending on the environment, such as the strength of the electric field in the area where the terminal is located, and the terminal determines the strength of the signal to be transmitted from the strength of the received communication signal.

However, the positioning function in the terminal acquires the location information by transmitting and receiving a GPS signal through a frequency channel separate from the communication channel and the communication between the terminal and the base station. When the terminal is located in the weak field, the signal received from the base station by the terminal is weak, so that the strength of the signal transmitted by the terminal to the communication channel with the base station increases, the increase in the size of the signal in the communication channel In this case, interference with a frequency channel through which a GPS signal is communicated lowers the sensitivity of the GPS signal, and thus the accuracy of the location information grasped by the terminal from the GPS signal is inferior.

An object of the present invention devised to solve the above problems is to provide a method for adjusting the size of the transmission signal in the general communication channel of the terminal so as not to lower the sensitivity of the GPS signal for positioning.

In order to solve the problems as described above, the automatic gain control method of the transmitting end of the present invention comprises the steps of: a positioning function for transmitting and receiving a GPS signal in a wireless communication terminal; Detecting power of a transmission signal of a general communication channel of the wireless communication terminal; Comparing the detected power value with a reference power value; And when the detected power value is larger than the reference power value, reducing the size of the transmission signal by reducing the automatic gain adjustment value of the transmitter.

In the present invention, the location detection function of the wireless communication terminal is preferably driven by the operation of the emergency rescue service function.

In the present invention, it is preferable that the transmitter automatic gain control method further comprises converting the detected power value into a digital value before comparing the detected power value with a reference power value.

In the present invention, in the step of reducing the automatic gain adjustment value of the transmitter, it is preferable to reduce the automatic gain adjustment value of the transmitter so that the power value detected from the transmission signal is smaller than the reference power value.

In the present invention, the method of controlling the automatic gain of the transmitter may include acquiring and transmitting position information of the terminal when the detected power value is smaller than the reference power value in the step of comparing the detected power value with a reference power value. It is preferable to further include.

In the present invention, the method for automatically controlling the transmitting end of the transmitter determines whether the detected power value is included in at least one of detailed levels before comparing the detected power value with a reference power value. Further comprising, wherein the level of detail is preferably a range of each of the power value range is divided into at least two or more.

In the present invention, the step of reducing the transmitter automatic gain adjustment value may be different in size to reduce the transmitter automatic gain adjustment value according to the level of detail to which the detected power value belongs.

In the present invention, the transmitting end automatic gain control method detects the power value of the transmission signal until the power value detected in the transmission signal is smaller than the reference power value, comparing the detected power value with the reference power value Doing; And if the detected power value is greater than the reference power value, repeating the step of reducing the transmitter automatic gain adjustment value.

In the present invention, the automatic gain control method of the transmitter is a step before the step of reducing the automatic gain adjustment value to the magnitude of the automatic gain adjustment value when the operation of the positioning function is terminated after all the steps. Preferably, the method further includes changing the size.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In adding reference numerals to components of the following drawings, it is determined that the same components have the same reference numerals as much as possible even if displayed on different drawings, and it is determined that they may unnecessarily obscure the subject matter of the present invention. Detailed descriptions of well-known functions and configurations will be omitted.

1 is a flowchart illustrating a process of performing an embodiment of a method for controlling automatic gain of a transmitter in accordance with the present invention.

When the positioning function for transmitting and receiving the GPS signal in the wireless communication terminal is driven (S101), the power strength of the transmission signal of the general communication channel is detected (S102), and the power value of the detected transmission signal is converted into a digital value; In step S103, it is determined whether the detected power value belongs to one of the detailed levels of the power value (S104), the detected power value is compared with a predetermined reference power value (S105), and the detected power value is If it is larger than the reference power value, the auto gain adjustment value (hereinafter referred to as 'AGC value') of the transmitter is reduced to reduce the power size of the transmission signal (S106). Determining and comparing with the reference power value again (S102 ~ S105), if the power value of the detected transmission signal is less than the reference power value to determine the location information by transmitting and receiving the GPS signal Transmitting the location information (S107), the reduced value after the end of all the operations carried out in the identification and transmission of the location information is returned to the AGC value of the transmitted signal to its original value (S108).

In the above embodiment, in the step (S101) in which the location function is driven, an emergency rescue service such as 'E911' may be activated in the wireless communication terminal to perform a location function accompanied with transmission and reception of a GPS signal.

In the above embodiment, the detected power value is preferably converted to a digital value for the convenience of comparison in step S105 (S103). The step S103 of converting the detected power value into a digital value is preferably performed by a conventional analog-to-digital conversion circuit (ADC circuit).

Preferably, the reference power value is a power value detected from a transmission signal of a general communication channel having a magnitude that does not affect or do not affect a GPS signal for positioning. The value is determined, and the value varies depending on the type of general communication channel, frequency band, and the like.

In the above embodiment, it is preferable that the detected power value is converted to a digital value, and then, to which level of detail, the range of power values belongs to two or more parts, it is determined (S104). The level of detail is a range of power divided by two or more parts, and in particular, each part divided into two or more parts in a range of power values larger than the reference power value is preferable.

Table 1 Example of Level of Detail

Level of detail Output signal voltage value (V) One v> 2 2 1.9 <v <2 3 1.8 <v <1.9 . . . . . . n v <1

Table 1 shows an example of the level of detail. As described above, when the detail level is predetermined according to the power value or the voltage value detected from the transmission signal and the amount of change of the transmitter automatic gain adjustment value is uniformly defined for each detail level, it is determined to which level the detected power value belongs. According to the result, in step S106 of adjusting the transmitter automatic gain adjustment value, it is possible to efficiently adjust the transmitter automatic gain adjustment value.

In the above embodiment, when it is determined in step S105 that the detected power signal value is greater than the reference power value, the power of the transmission signal is reduced by reducing the automatic gain adjustment value of the transmitter that transmits the signal of the general communication channel. Reduce the size (S106). The degree of reducing the AGC value is preferably reduced so that the magnitude of power detected from the transmission signal is smaller than the reference power value, and the amount of AGC value is reduced according to the detail level is different. It is also desirable to change the AGC value as previously defined.

In addition, after the step (S106) to determine whether the power value of the transmission signal is reduced to less than the reference power value from the decrease of the AGC value, detecting the power value for the transmission signal by the reduced AGC value again The process from step S105 to comparing the detected power value with the reference power value (S105) is preferably performed again, and the process and conditionally performed from step S102 to step S105 ( S106 is preferably performed repeatedly until the power value detected from the transmission signal in step S105 is smaller than the reference power value.

In the above embodiment, the step of obtaining and transmitting the location information (S107), when the power value detected from the transmission signal of the general communication channel as a result of the determination in step (S105) has a value smaller than the reference power value. It is preferable to obtain location information by transmitting and receiving GPS signals and to transmit the location information to a server such as an emergency rescue service.

In the above embodiment, when the purpose of driving the positioning function is achieved by transmitting the position information in step S107, the AGC value of the transmitting end of the general communication channel is reduced by passing through the steps S101 to S107. It is preferable to return to the value of (S108).

As described above, it has been described with reference to the preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

As described above, according to the present invention, in performing a service for acquiring and transmitting location information through transmission and reception of a GPS signal such as an emergency rescue service, by adjusting the size of a transmission signal of a general communication channel to an appropriate size, higher accuracy is achieved. You can get location information with.

Claims (9)

Driving a positioning function of transmitting and receiving a GPS signal in a wireless communication terminal; Detecting power of a transmission signal of a general communication channel of the wireless communication terminal; Comparing the detected power value with a reference power value; And And when the detected power value is greater than a reference power value, reducing the size of the transmission signal by reducing an automatic gain adjustment value of a transmitter. The method of claim 1, wherein the location detection function of the wireless communication terminal is driven by the operation of the emergency rescue service function. The wireless communication method of claim 1, wherein the method of controlling the automatic gain of the transmitter further comprises converting the detected power value into a digital value before comparing the detected power value with a reference power value. Automatic gain control method of a transmitting end of a terminal. The method of claim 1, wherein the step of reducing the automatic gain adjustment value of the transmitter is to reduce the automatic gain adjustment value of the transmitter so that the power value detected from the transmission signal is smaller than the reference power value. Transmitter automatic gain control method. The method of claim 1, wherein the method of controlling the automatic gain of the transmitting end acquires and transmits the position information of the terminal when the detected power value is smaller than the reference power value in the step of comparing the detected power value with a reference power value. The automatic gain control method of the transmitting end of the wireless communication terminal further comprising the step of. The method of claim 1, wherein the automatic gain control method of the transmitter determines whether the detected power value is included in at least one of the detailed levels before comparing the detected power value with a reference power value. The method further comprises the step of, wherein the level of detail is the automatic gain control method of the transmitting end of the wireless communication terminal, characterized in that each range divided into at least two or more of the power value range. 7. The method of claim 6, wherein the step of reducing the transmitter automatic gain adjustment value has a different magnitude of decreasing the transmitter automatic gain adjustment value according to a detail level to which the detected power value belongs. Way. 2. The method of claim 1, wherein the transmitting end automatic gain control method detects a power value of the transmission signal until the power value detected from the transmission signal is smaller than a reference power value, and based on the detected power value. Comparing with a value; And if the detected power value is larger than a reference power value, repeatedly reducing the transmitter automatic gain adjustment value. The method of claim 1, wherein in the transmitting end automatic gain control method, when the driving of the position detecting function is terminated after all the steps, the step of reducing the automatic gain adjustment value is performed before the step of reducing the magnitude of the automatic gain adjustment value. The method of claim 1, further comprising the step of changing the size of the wireless communication terminal of the automatic gain control method.

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