KR20020011546A - Method and apparatus for calibration transmit and receive signal in cdma system - Google Patents

Abstract

PURPOSE: A device for measuring transceiving signals of a CDMA(Code Division Multiple Access) system is provided to measure the transceiving signals of the CDMA system, so as to reduce errors during power detection of transmitting and receiving terminals by using CDMA waveform. CONSTITUTION: Digital step attenuators(301,303) input baseband signals and control levels of the baseband signals under control of a computer, then output the baseband signals. Differential amplifiers(304,309) input the level-controlled baseband signals to convert the baseband signals into differential signals, and output the differential signals to a transmitter. A power measurer inputs the differential signals through the transmitter to measure power of the differential signals, and outputs the differential signals to the computer.

Description

Transmitting and receiving signal measuring apparatus and method of code division multiple access system {METHOD AND APPARATUS FOR CALIBRATION TRANSMIT AND RECEIVE SIGNAL IN CDMA SYSTEM}

The present invention relates to an apparatus and method for measuring a transmission signal for fault diagnosis of a transceiver of a code division multiple access system. In particular, the present invention relates to a failure of a transceiver of a system by measuring a transmission / reception signal of a code division multiple access system using a signal division multiple access waveform. The present invention relates to a device and a method for making a diagnosis.

In general, a singleton is used to measure a transmission / reception signal of a transceiver (TRXA) in a code division multiple access system. The singleton is 4.95 MHz at a single frequency. The configuration and operation of a conventional apparatus for diagnosing a failure of a transmitter using a singleton of 4.95 MHz will be described with reference to FIG. 1.

FIG. 1 is a diagram showing the configuration of a general measuring apparatus using a singleton to measure the transmission and reception signals of a transceiver (TRXA) of a code division multiple access system. Referring to FIG. 1, the signal generator 103 generates a 10 MHz reference frequency and a 4.95 MHz single tone under the control of the computer 101, and outputs the single tone to the system 107. In the system 107, the transceiver board XCVU 109 is a board using an intermediate frequency, and performs a troubleshooting using a singleton in the measurement. Also, single channel signal input for fault diagnosis requires a separate channel card for fault diagnosis. When the singleton signal is input, the signal measured by the separate channel card is input to the computer 101. The computer 101 outputs and displays the measured values to the signal analyzer 105 connected through a monitor or an HP-IB cable.

In recent years, instead of the XCVU 109, a TRXA transmitter board that directly converts a baseband signal into a radio frequency signal is transmitted. TRXA, which is a transmitter board of the code division multiple access system, measures the power of the baseband signal and the power of the output signal which are input for its fixed diagnosis, and reports it to the system.

Therefore, in order to measure accurate power, the ADC value when the signal of the actual CDMA waveform is output must be obtained. The ADC value of the singleton and the ADC value of the CDMA waveform have different values. There is a problem that can not be measured, and the baseband signal signal can not be input to TRXA, the transceiver board.

In addition, the power of the signal that can be input in the conventional method has a problem that is fixed.

Accordingly, an object of the present invention is to provide a measuring apparatus and a method for more accurate fault diagnosis using an input code division multiple access waveform in fault diagnosis of a transceiver of a code division multiple access system.

Another object of the present invention is to provide a measuring apparatus and a method capable of performing a more accurate fault diagnosis by adjusting the power of the code division multiple access waveform input for fault diagnosis of a transceiver of a code division multiple access system.

In order to achieve the above object, the present invention provides a transmission measurement apparatus using a baseband signal, a digital step attenuator for receiving a baseband signal and controlling the level of the baseband signal under computer control; A differential amplifier which receives a level-adjusted baseband signal and converts the differential signal into a differential signal and outputs the differential signal to a transmitter; and a power meter that receives the differential signal through the transmitter and measures the power of the differential signal and outputs the differential signal to the computer. Characterized in that made.

According to an aspect of the present invention, there is provided a transmission measurement method using a baseband signal, the method comprising: receiving a baseband signal and being controlled by a computer to adjust the level of the baseband signal; Receiving a band signal, converting the differential signal into a differential signal, and outputting the differential signal to the transmitter; and receiving the differential signal through the transmitter and measuring the power of the differential signal.

According to another aspect of the present invention, there is provided a reception measuring apparatus using a baseband signal, comprising: a signal generator for generating a radio frequency signal, a signal separator for splitting the radio frequency signal and outputting the radio frequency signal to a receiver; Characterized in that the display device for receiving and displaying the power value of the radio frequency signal through.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a configuration of a measuring apparatus for measuring a transmission / reception signal of a general code division multiple access system.

2 is a diagram illustrating a configuration of an apparatus for measuring a transmission / reception signal of a code division multiple access system according to an embodiment of the present invention.

3 is a block diagram of the jig device of FIG. 2;

4 is a diagram illustrating a transmission signal measuring process according to an exemplary embodiment of the present invention.

5 is a view showing a received signal measurement process according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, in adding the reference numerals to the components of each drawing, the same components have the same reference numerals as much as possible even if displayed on different drawings. In describing the present invention, when 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.

2 is a block diagram illustrating a failure diagnosis apparatus of a code division multiple access system transceiver according to an exemplary embodiment of the present invention. Hereinafter, an operation according to the present invention will be described with reference to FIG. 2.

The failure diagnosis apparatus according to the present invention includes a computer 240, a signal analyzer 210, a signal generator 220, a power meter 230, and a jig device 200.

The jig device 200 has a power supply unit 201 having a regulator for generating -5V using a power connector (+ 5V_D, + 5V_RF, + 8V, -8V, + 3.3V, GND) and -8V to connect an external power source. ), And a connector 203 consisting of a connector for mounting a TRXA, a connector for mounting a TRXA control board, and a 9-pin connector for digital step attenuator control. The connector unit 203 includes an RF connector including an I_IN / Q_IN port for inputting a baseband signal signal, four differential ports for spectrally measuring differential signals, and a port for providing a 10 MHz clock.

The signal analyzer 210 is connected to the TX_I- port of the differential port to analyze and display an I-signal. The signal generator 220 generates and outputs an I / Q baseband signal and an RF signal under the control of the computer 240. The I / Q baseband signal is input to the I_IN / Q_IN port, and is input to the RX_RF_A and RX_RF_B of the TRXA slot 202 by the RF signal 2Way P / D. In addition, the signal generator 220 generates a reference clock of 10MHz and outputs it to the 10MHz port of the jig device 200.

3 is a block diagram of FIG. 2. In FIG. 3, the digital step attenuators 301 and 303 that receive the I and Q signals, which are baseband signal signals input through the I_IN and Q_IN ports of FIG. 2, respectively, are connected to the computer 240 of FIG. The control varies the I and Q signals of the predetermined level, respectively, to provide a baseband signal measurement range. The I and Q signals which are varied in the digital step attenuators 301 and 303 are input to the differential amplifiers 307 and 309, respectively. The differential amplifiers 307 and 309 receive I and Q signals, which are single-ended signals output from the digital step attenuators 301 and 303, respectively, and convert the I and Q signals into differential modes, respectively. Output to TRXA. In other words, the I signal is converted into I + and I- signals, and the Q signal is converted into Q + and Q- (hereinafter referred to as a "differential signal") to output TRXA. TRXA receives the differential I / Q signal, up-converts it, and outputs it to the TX_RF port of the TRXA slot 202 of the jig device 200. The signal output from the TX_RF port is input to the power meter 230. The power meter 230 measures the power of the signal and provides it to the computer 240.

4 is a diagram illustrating a measurement process of a transmission path according to an embodiment of the present invention. Hereinafter, an operation of measuring a transmission path will be described with reference to FIG. 4.

First, in step 401, the signal generator 210 generates and outputs a baseband signal signal 5 under the control of the computer 240. The I signal of the generated baseband signal signal 5 is input to the TX_IN_I port of the jig device 200, and the Q signal is input to the TX_IN_Q. The I / Q baseband signal signals inputted through the TX_IN_Q and TX_IN_I are input to the digital step attenuators 301 and 303 of FIG. In step 403, the digital step attenuators 301 and 303 receive a control signal from the computer 240 through a 9-pin connector, and adjust the power of each of the I / Q signals to output to the differential amplifiers 307 and 309, respectively. Each output I / Q signal is a single-ended signal. In operation 405, the differential amplifiers 307 and 309 convert the corresponding signals into differential signals. In other words, I signal is converted into I + and I- signals, and Q signal is converted into Q + and Q-. In operation 407, the differential amplifiers 307 and 309 output the differential signal to TRXA. At this time, the TRXA up-converts the differential signal and outputs the differential signal to the TX_RF port of the TRXA slot 202. Then, in step 409, the power meter 230 measures and displays the power of the signal output through the TX_RF port and provides it to the computer 240.

5 is a view showing a measurement process of the RX path according to an embodiment of the present invention. Hereinafter, the RX path measurement operation will be described with reference to FIG. 5.

First, in step 501, the signal generator 210 generates and outputs an RF signal under the control of the computer 240. The RF signal is input to RX_RF_A and RX_RF_B by 2Way P / D. The RF signals input to the RX_RF_A and RX_RF_B are input to TRXA and down converted. The TRXA measures and outputs the power of the RX signal after down converting the RF signal. After outputting the RF signal, the computer 240 checks whether the RX signal measurement value is input through the 9-pin connector D_sub in step 503. When the RX signal measurement value is input, the computer 240 displays the monitor and / or outputs the power meter 230 in step 505.

By applying and measuring a differential mode signal in almost the same condition as a code division multiple access waveform input from an actual system, there is an advantage of minimizing an error in detecting power of a transmitter and a receiver.

In addition, there is an advantage that the entire measurement process can be performed at once through the automatic control of the digital step attenuation to adjust the level of the baseband signal signal.

Claims (7)

In the transmission measuring apparatus using the baseband signal, A digital step attenuator for receiving a baseband signal and controlling the level of the baseband signal under computer control; A differential amplifier for outputting the level-adjusted baseband signal to a transmitter for converting and outputting the differential signal into a differential signal; And a power measuring device receiving the differential signal through the transmitter and measuring the power of the differential signal and outputting the differential signal to the computer. The method of claim 1, wherein the digital step attenuation unit, A first digital step attenuator for adjusting and outputting the level of the baseband signal of the in-phase component of the baseband signal; And a second digital step attenuator for adjusting and outputting the level of the baseband signal of the orthogonal component of the baseband signal. The method of claim 1, wherein the differential amplifier, A first differential amplifier for converting the baseband signal of the in-phase component of the level-adjusted baseband signal into a differential signal and outputting the differential signal; And a second differential amplifier which converts a baseband signal of an orthogonal component of the level-adjusted baseband signal into a differential signal and outputs the differential signal. In the transmission measurement method using a baseband signal, Adjusting a level of the baseband signal by receiving a baseband signal and being controlled by a computer; Receiving the level-adjusted baseband signal, converting it into a differential signal, and outputting the differential signal to a transmitter; And receiving the differential signal through the transmitter and measuring the power of the differential signal. In the reception measurement apparatus using the baseband signal, A signal generator for generating a radio frequency signal, A signal separator for dividing the radio frequency signal and outputting the split signal to a receiver; And a display device for receiving and displaying a power value of the radio frequency signal through the receiver. 6. The reception measurement device using a baseband signal according to claim 5, wherein the display device is a computer. In the reception measurement method using a baseband signal, Generating a radio frequency signal, Dividing the radio frequency signal and providing the radio frequency signal to a receiver; And receiving and displaying the power value of the radio frequency signal through the receiver.