KR0162833B1 - Base station of radio communication with signal level converting circuit - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a base station of a wireless communication system.

2. The technical problem to be solved by the invention

A circuit for converting the level of the signal processed in the radio section of the base station to match the level of the signal processed in the baseband section is implemented.

3. Summary of Solution to Invention

The present invention converts and outputs a high frequency signal provided from the portable device into a first baseband signal swinging within a range of a first voltage level in a wireless communication system for wirelessly connecting the portable device. A wireless unit for simultaneously outputting the first baseband signal and a variable first reference voltage representing a reference of a width at which the swing swings; A reference voltage converter configured to output the variable first reference voltage as a third reference voltage which is variable based on a predetermined second reference voltage; A level converter which outputs the first baseband signal as a second baseband signal swinging within a range of a second voltage level with reference to the third reference voltage; Provided is a base station including a baseband unit for descrambling and demodulating the second baseband signal to output a restored voice signal.

In the above, the first voltage level refers to a voltage value in the range of 0 volts to 3 volts, and the second voltage level refers to a voltage value in the range of 0 volts to 5 volts. The first reference voltage is varied based on a voltage value of 1.5 volts, which is half of the first voltage level, and the second reference voltage has a voltage value of 2.5 volts, which is half of the second voltage level, and the third reference voltage. Is varied based on a voltage value of 2.5 volts that is half the second voltage level.

4. Important uses of the invention

The wireless section of the base station can also be used as the wireless section of the portable device.

Description

Base station of wireless communication system having signal level conversion circuit

1 is a view showing the configuration of a general wireless communication system.

2 is a view showing in detail the respective components of the mobile device and base station of FIG.

3 is a diagram showing the configuration of a base station according to the present invention;

4 is a diagram showing in detail the configuration of the signal level conversion circuit of FIG.

* Explanation of symbols for the main parts of the drawings

30: RF unit 36: reference voltage conversion unit

37: level converting section 40: base band section

The present invention relates to a wireless communication system, and more particularly, to a base station having a circuit for converting a level of a signal processed in a radio unit to be suitable for a level of a signal processed in a baseband unit.

In general, a wireless communication system is composed of a base station and a portable device, as shown in Figure 1, to enable the transmission and reception of signals between both. At this time, the base station is connected to the Public Switched Telephone Network by wire, and the portable device is wirelessly connected to the base station. Each of the base station and the portable apparatus is divided into a radio (RF) unit 20 and 30 and a baseband unit 10 and 40 as shown in FIG. The RF unit modulates a high frequency signal suitable for propagating a transmission signal into the air or demodulates a high frequency signal received from the air into a baseband signal. On the other hand, the baseband unit encodes and scrambles a voice signal for transmission to the RF unit, descrambles and decodes the demodulation output from the RF unit, and outputs the restored voice. .

Meanwhile, the RF unit and the baseband unit of the base station and the RF unit and the baseband unit of the portable device which perform the above functions process signals having different voltage levels. For example, the RF unit and the baseband unit of the portable device process signals having a range of 0 volts to 3 volts. The RF section of the base station also processes signals having a range of 0 volts to 3 volts. However, the baseband portion of the base station processes signals having a range of 0 volts to 5 volts.

Because of this difference, a technique for converting the level of the signal processed by the RF unit of the base station to the level of the signal processed by the baseband unit of the base station is required. In accordance with such a requirement, the RF unit of the base station is conventionally redesigned so that the RF unit of the base station converts the signal provided from the RF unit of the portable device into a signal suitable for the baseband unit of the base station. To this end, it is necessary to readjust the values of respective elements constituting the RF unit of the base station, for example, a transistor, a capacitor, a diode, and the like to appropriate values. As described above, by adjusting the values of the elements of the RF unit, a signal provided from the RF unit of the portable device may be converted into a signal suitable for the baseband unit of the base station.

However, there is a disadvantage in that the amount of power consumed increases as each element of the RF unit of the base station is readjusted. This is because the conventional RF unit processes signals in the range of 0 volts to 3 volts, but the readjusted RF unit must process signals having voltage levels in the range of 0 volts to 5 volts that are higher than the voltage levels in the range of 0 volts to 3 volts. . In addition, since the RF part of the redesigned base station and the RF part of the portable device are not the same, the RF part of the mobile device cannot be used as the RF of the base station, and the RF part of the base station cannot be used as the RF part of the mobile device. That is, there is no compatibility between the RF section of the base station and the RF section of the portable device.

Accordingly, an object of the present invention is to provide a signal level conversion circuit for converting a level of a signal provided from an RF unit to a level of a signal suitable for a baseband unit in a base station of a wireless communication system.

Another object of the present invention is to provide a signal level conversion circuit for enabling the RF unit of a base station to be used as an RF unit of a portable device in a wireless communication system.

Another object of the present invention is to provide a signal level conversion circuit for reducing the amount of power consumed by the RF unit of the base station in a wireless communication system.

According to an aspect of the present invention, a high frequency signal provided from the portable device is converted into a first baseband signal swinging within a range of a first voltage level in a wireless communication system for wirelessly connecting the portable device. And an RF unit for outputting the first baseband signal and a variable first reference voltage indicating a reference of a width at which the first baseband signal swings; A reference voltage converter configured to output the variable first reference voltage as a third reference voltage which is variable based on a predetermined second reference voltage; A level converter which outputs the first baseband signal as a second baseband signal swinging within a range of a second voltage level with reference to the third reference voltage; Provided is a base station including a baseband unit for descrambling and demodulating the second baseband signal to output a restored voice signal.

In the above, the first voltage level refers to a voltage value in the range of 0 volts to 3 volts, and the second voltage level refers to a voltage value in the range of 0 volts to 5 volts. The first reference voltage varies based on a voltage value of 1.5 volts that is half the first voltage level, and the second reference voltage has a voltage value of 2.5 volts that is half the second voltage level, and the third reference voltage. Is varied based on a voltage value of 2.5 volts that is half the second voltage level.

The reference voltage converter includes an operational amplifier for inputting a first reference voltage as a non-inverting terminal and a second reference voltage as an inverting terminal to output a third reference voltage as an output terminal. The level converting unit includes a first baseband signal. Is inputted to the non-inverting terminal, and the third reference voltage is inputted to the inverting terminal. The output amplifier outputs a second baseband signal.

In this way, since the signal level provided from the RF unit in the base station of the wireless communication system can be converted into a level suitable for the baseband unit, the RF unit of the base station can also be used as the RF unit of the portable device. The amount of power consumed can be reduced.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The terms to be described below are terms defined in consideration of functions in the present invention, and may be changed according to the intention or custom of the user or chip designer, and the definitions should be made based on the contents throughout the present specification.

3 is a diagram illustrating a configuration of a base station according to the present invention, and it can be seen that the RF unit 30, the baseband unit 40, and the signal level conversion circuit 35 are included. The RF unit 30 and the baseband unit 40 are the same as the RF unit and the baseband unit of FIG. 2, respectively. The signal level converting circuit 35 causes the signal processed by the RF unit 30 whose level is changed within a range of 0 volts to 3 volts so that its level changes within a range of 0 volts to 5 volts. As a component that performs the function provided by the band unit 40, its configuration is shown in detail in FIG.

Referring to FIG. 4, the signal level converting circuit 35 may be processed by the reference voltage converting unit 36 for converting the reference voltage of the RF unit 30 into a reference voltage of the baseband unit 40 and the RF 30. And a level converting section 37 for converting the level of the signal into a level of a signal that can be processed by the baseband section 40. The reference voltage converter 36 and the level converter 37 are implemented as a first operational amplifier OP1 and a second operational amplifier OP2 having a non-inverting terminal, an inverting terminal, and an output terminal, respectively. The first reference voltage Vref1 through the resistor R1 is applied to the non-inverting terminal (+) of the first operational amplifier OP1, the second reference voltage Vref2 is applied to the inverting terminal (−), and the third to the output terminal. The reference voltage Vref3 is output. At this time, the resistor R2 is connected between the non-inverting terminal (+) and the output terminal. The first signal S1 through the resistor R3 is applied to the non-inverting terminal (+) of the second operational amplifier OP2, and the third reference voltage Vref3 output from the operational amplifier OP1 is applied to the inverting terminal (-). The second signal S2 is output to the output terminal. At this time, the resistor R4 is connected between the non-inverting terminal (+) and the output terminal. The resistors R1 and R2 determine the amplification degree of the first operational amplifier OP1, and the resistors R3 and R4 determine the amplification degree of the second operational amplifier OP2. The first operational amplifier OP1 converts the first reference voltage Vref1 used in the RF unit 30 into a third reference voltage Vref3 used in the baseband unit 40, and the second operational amplifier OP2. Performs the function of converting the first signal S1 in the range of 0 to 3 volts processed by the RF unit 30 into the second signal S2 in the range of 0 to 5 volts to be processed by the baseband unit 40. This operation may be possible by appropriately setting the values of the resistors R1, R2 and resistors R3, R4.

In FIG. 4, the first signal S1 is a signal of the baseband unit which is output after being processed by the RF unit 30 and is a signal swinging within a range of 0 volts to 3 volts. The first reference voltage Vref1 is a voltage representing the reference of the S1 signal that is changed when the level of the S1 signal is minutely swinged or changed over time. The first reference voltage Vref1 has a voltage value that varies from 1.5 volts, which is half of 3 volts, to RF. The unit 30 is output together with the S1 signal. The second reference voltage Vref2 is a fixed reference voltage representing half of the signal level processed by the baseband portion 40, that is, 5 volts / 2 = 2.5 volts. The third reference voltage Vref3 is a reference voltage output from the reference voltage converter 36 and is a reference voltage to be used by the baseband unit 40. The third reference voltage Vref3 has a voltage value that varies from 2.5 volts, which is half of 5 volts. The second signal S2 is a signal output from the level converter 37 and a range of 0 volts to 5 volts for which a baseband signal of 0 volts to 3 volts output from the RF unit 30 is required by the baseband unit 40. The signal is converted into the signal of.

When the first signal S1 and the first reference voltage Vref1 are output from the RF unit 30, the first signal S1 is a ratio of the second operation amplifier OP2 constituting the level converter 37 through the resistor R3. The first reference voltage Vref1 is applied to the inverting terminal (+) and is applied to the non-inverting terminal (+) of the first operational amplifier OP1 constituting the reference voltage converter 36 through the resistor R1. In this case, since the second reference voltage Vref2 having a fixed voltage value, that is, a voltage value of 2.5 volts is applied to the inverting terminal (−) of the first operational amplifier OP1, the first operational amplifier OP1 swings the first signal S1. As a result, the variable first reference voltage Vref1 is converted into a reference voltage corresponding to the second reference voltage Vref2 and output. That is, the first operational amplifier OP1 outputs the first reference voltage Vref1, which is variable based on 1.5 volts, to the third reference voltage Vref3, which is variable based on the second reference voltage Vref2, that is, 2.5 volts. The third reference voltage Vref3 output as described above is applied to the inverting terminal (−) of the first operational amplifier OP1 as the reference voltage to be used by the baseband unit 40.

Meanwhile, the first operational amplifier OP1 converts the level of the first signal S1 applied to the non-inverting terminal (+) based on the third reference voltage Vref3 and outputs the second signal S2. The reason for this operation is that the first signal S1 applied to the non-inverting terminal (+) of the first operational amplifier OP1 has a level in the range of 0 volts to 3 volts, but the third reference voltage applied to the inverting terminal (-). This is because Vref3 is varied based on 2.5 volts. The second signal S2 thus output has the same level as the level of signals suitable for processing in the baseband portion 40 having a level in the range of 0 volts to 5 volts.

As described above, the signal level converting circuit according to the present invention converts a signal having a level in the range of 0 to 3 volts output from the RF unit into a signal having a level in the range of 0 to 5 volts suitable for processing in the baseband unit. Output to the baseband section. Accordingly, there is an advantage that the RF unit can also be used as the RF unit of the portable device because it is not necessary to readjust the values of the elements of the RF unit. In addition, there is an advantage in reducing the power consumption that is increased by re-adjusting the values of the elements of the RF unit.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. For example, in the specific embodiment of the present invention, only the example of converting a signal having a level in the range of 0 volts to 3 volts into a signal having a level in the range of 0 volts to 5 volts has been described. A signal having a level of may be converted into a signal having a level ranging from 0 volts to 3 volts. This operation applies a variable reference voltage based on 2.5 volts as the first reference voltage, applies 1.5 volts as the second reference voltage, and applies a variable reference voltage based on 1.5 volts as the third reference voltage. In addition, it may be possible to properly set the value of the resistors connected to each operational amplifier. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

Claims (18)

A base station of a wireless communication system for wirelessly connecting a portable device, comprising: converting a high frequency signal provided from the portable device into a first baseband signal swinging within a range of a first voltage level, and outputting the first baseband signal; A wireless unit for simultaneously outputting the first baseband signal with a variable first reference voltage indicating a reference of a width at which a signal swings, and the variable first reference voltage based on a second predetermined reference voltage A reference voltage converter for outputting a variable third reference voltage and a level for outputting the first baseband signal as a second baseband signal swinging within a range of a second voltage level based on the third reference voltage; And a converter and a baseband unit for outputting the second baseband signal as a decoded and demodulated audio signal. 2. The base station of claim 1, wherein said first voltage level is in the range of 0 volts to 3 volts. 2. The base station of claim 1, wherein said second voltage level is in the range of 0 volts to 5 volts. The base station of claim 1, wherein the first reference voltage is varied based on a half value of the first voltage level. 3. The base station of claim 2, wherein the first reference voltage is varied based on a value of 1.5 volts, which is half of the first voltage level. The base station of claim 1, wherein the second reference voltage has a half value of the second voltage level. 4. The base station of claim 3, wherein the second reference voltage has a value of 2.5 volts that is half of the second voltage level. The base station of claim 1, wherein the third reference voltage is varied based on a half value of the second voltage level. 4. The base station of claim 3, wherein the third reference voltage is varied on the basis of 2.5 volts, which is half of the second voltage level. The non-inverting terminal, the inverting terminal, and the output terminal of claim 1, wherein the reference voltage converter includes the first reference voltage as the non-inverting terminal and the second reference voltage as the inverting terminal. And an operational amplifier configured to input and output the third reference voltage to the output terminal. The non-inverting terminal, the inverting terminal, and the output terminal of claim 1, wherein the level converter includes the first baseband signal as the non-inverting terminal and the third reference voltage as the inverting terminal. And an operational amplifier configured to input and output the second baseband signal to the output terminal. A signal level converting circuit comprising: first signal processing means for processing a first signal swinging within a range of a first predetermined voltage level, and a second signal swinging within a range of a second predetermined voltage level; Second signal processing means and converting means for converting the first signal into a swinging signal within a range of the second voltage level based on a half value of the second voltage level and providing the second signal to the second signal processing means. Signal level conversion circuit characterized in that the configuration. In a signal level converting circuit, a first signal swinging within a range of a predetermined first voltage level is processed, and a variable first reference voltage representing a reference of a width at which the first signal swings is compared with the first signal. A first signal processor for simultaneously outputting a reference voltage converter for outputting the first signal to a third reference voltage variable based on a predetermined second reference voltage, and the first signal to the third reference voltage And a level converting section for outputting as a second signal swinging within a predetermined second voltage level, and a second signal processing section for processing the second signal. The signal level converting circuit according to claim 13, wherein the first reference voltage is varied based on a half value of the first voltage level. The signal level converting circuit of claim 13, wherein the second reference voltage has a half value of the second voltage level. The signal level converting circuit according to claim 13, wherein the third reference voltage is varied based on a half value of the second voltage level. The non-inverting terminal, the inverting terminal, and the output terminal of claim 13, wherein the reference voltage converter includes the first reference voltage as the non-inverting terminal and the second reference voltage as the inverting terminal. And an operational amplifier configured to input and output the third reference voltage to the output terminal. The non-inverting terminal, the inverting terminal, and the output terminal of claim 13, wherein the level converting unit comprises: inputting the first signal to the non-inverting terminal and inputting the third reference voltage to the inverting terminal; And an operational amplifier for outputting the second signal to the output terminal.