KR20070022416A - Apparatus and method for detectting received signal in tdd system - Google Patents

Abstract

An apparatus and method for detecting a received signal in a time division duplex (TDD) transceiver, the apparatus comprising: a detector coupled to check a received signal; It includes a measuring unit for checking whether the reception is normally received, and a switch connecting the detection unit and the measuring unit in the receiving interval, there is an advantage that can accurately check the state of the received signal by blocking the leakage transmission signal when the received signal is detected.

Time division duplex receiver, leakage transmission signal, reception signal detection, leakage transmission signal blocking

Description

Apparatus and method for detecting received signal in time division duplex system {APPARATUS AND METHOD FOR DETECTTING RECEIVED SIGNAL IN TDD SYSTEM}

1 is a diagram illustrating an example of a structure of a time division duplex transceiver for a wireless communication system according to the prior art;

2 is a diagram illustrating another example of a structure of a time division duplex transceiver for a wireless communication system according to the prior art;

3 is a diagram illustrating a structure of a time division duplex transceiver for detecting a received signal according to a first embodiment of the present invention;

4 is a diagram illustrating an operation procedure of a time division duplex transceiver for detecting a received signal according to the first embodiment of the present invention;

5 is a diagram illustrating a structure of a time division duplex transceiver for detecting a received signal according to a second embodiment of the present invention;

6 is a diagram illustrating an operation procedure of a time division duplex transceiver for detecting a received signal according to a second embodiment of the present invention;

7 is a diagram illustrating a structure of a time division duplex transceiver for detecting a received signal according to a third embodiment of the present invention;

8 is a diagram illustrating an operation procedure of a time division duplex transceiver for detecting a received signal according to a third embodiment of the present invention;

9 illustrates a structure of a time division duplex transceiver for detecting a received signal according to a fourth embodiment of the present invention;

10 is a diagram illustrating an operation procedure of a time division duplex transceiver for detecting a received signal according to a fourth embodiment of the present invention;

11 illustrates a structure of a time division duplex transceiver for detecting a received signal according to a fifth embodiment of the present invention;

12 is a view showing an operation procedure of a time division duplex transceiver for detecting a received signal according to a fifth embodiment of the present invention;

13 is a diagram showing the structure of a time division duplex transceiver for detecting a received signal according to a sixth embodiment of the present invention;

14 is a view showing an operation procedure of a time division duplex transceiver for detecting a received signal according to a sixth embodiment of the present invention; and

15 is a graph showing a control signal for detecting a received signal according to the present invention.

The present invention relates to an apparatus and method for time division duplex transceivers in a wireless communication system, and more particularly, to an apparatus and method for detecting the reception signal for checking a state of a reception signal during system operation in the time division duplex transceiver.

The time division duplex (TDD) supports bidirectional transmission using the same frequency band, unlike the frequency division duplex (FDD) method, which uses different frequency bands for uplink and downlink for bidirectional communication. do. The TDD scheme can support the same transmission rate using fewer timeslots than the FDD scheme, and the TDD scheme is inexpensive because it is suitable for asymmetric or bursty applications due to the dynamic allocation of the timeslots. It is being researched and developed with very attractive technology for telecommunication operators who want to provide wireless internet service.

1 illustrates an example of a structure of a time division duplex transceiver in a wireless communication system according to the prior art. In the following description, the time division module of the time division duplex transceiver detects data in a transmission or reception mode using a circulator or an RF switch, but in the following description, it is assumed that an RF switch is used.

As shown in FIG. 1, the time division duplex transceiver includes: a baseband processor which performs signal processing in a baseband, an intermediate frequency (IF) band, and a radio frequency (RF) band, respectively; 10), IF section 20, RF section (30).

First, the baseband processor 10 includes a modem 11 (Modem: Modulator and Demodulator), a DUC 12 (Digital Up Converter), a DDC 14 (Digital Down Converter), and an FPGA 13 (Field Programmable Gate Array). It is configured to include).

The modem 11 (modulator & demodulator) performs modulation and demodulation of the transmission and reception signals. The DUC 12 converts the baseband transmission signal into a digital up frequency conversion to an intermediate frequency, and the DDC 14 converts the intermediate frequency band received signal into a digital down frequency conversion to a baseband signal.

The FPGA 13 performs a control function set by a user.

Next, the IF unit 20 uses the DAC 21 (Digital to Analog Converter), the ADC 27 (Analog to Digital Converter) buffers 22 and 26, the frequency synthesizers 23 and 25 and the local oscillator 24. Include.

The DAC 21 converts the digital transmission signal into an analog signal, and the ADC 27 converts the analog reception signal into a digital signal. The signal converted by the DAC 21 passes through the buffer 22 and then synthesizes the transmission signal of the IF band and the output signal of the local oscillator 24 in the first frequency synthesizer 23 and converts the signal into an RF band signal. . In addition, the second frequency synthesizer 25 synthesizes the received signal of the RF band and the output signal of the local oscillator 24 and converts the signal into an IF band.

The local oscillator 24 down-converts the RF signal to demodulate the RF signal received by the frequency synthesizer 25 and the RF signal received by the frequency synthesizer 25 into an IF signal. Signal is generated.

Finally, the RF unit 30 includes a high power amplifier (HPA) 31, a low noise amplifier (LNA) 33, an RF switch 32, a band pass filter (BPF 34), and a directional coupler (D /). C: Directional Coupler).

The RF unit 30 directly radiates or receives a radio transmission / reception signal. Therefore, in the case of the transmitter, HPA 31, which is a high output amplifier, and in the case of the receiver, LNA 33, which is a low noise amplifier, are used.

The RF switch 32 is switched so that a transmission signal from the HPA 31 is connected to a band pass filter (BPF 34), which is a band filter when transmitting, and a reception signal from the BPF 34 is received when receiving. It is switched to connect to the LNA 33.

The BPF 34 performs a function of band filtering the transmission signal and the reception signal. Directional coupler (D / C) 35 performs a function of coupling a transmission / reception signal in a connection between the BPF 34 and the antenna. The directional coupler 35 extracts a signal with a certain amount of coupling degree only for the path of the transmission and reception signal, and in the case of other direction signals, it has a certain amount of isolation to separate the transmission and reception signal. That is, the port for detecting the received signal is separated by the coupling degree. At this time, the transmission signal is isolated and the transmission signal is not detected.

2 illustrates another example of a structure of a time division duplex transceiver in a wireless communication system according to the prior art. In the following description, the baseband unit 10, the IF unit 20, and the RF unit 30 of FIG. 2 are the baseband unit 10, the IF unit 20, and the RF unit 30 of FIG. 1. The same configuration and operation as in the above are omitted.

As shown in FIG. 2, a divider 36 is positioned at a previous stage of an analog / digital convertor (ADC) 27 to detect the received signal and check the received signal state. Here, the divider distributes the same value as the received signal.

In the time division duplex transceiver having the structure as described above, when the transmission / reception frequency is different, the received signal can be detected without the influence of the transmission signal. However, when the transmission / reception frequencies are the same, the difference between the leakage transmission signal power and the reception signal power is large, so that the detection of the reception signal is inaccurate due to the power of the leakage transmission signal.

Table 1 below shows the detection power of the received signal in the time division duplex transceiver of FIG.

 Kinds power Amplifier (AMP) transmit output (T) 43 dBm Directional coupler isolation (DC_1) 60 dB Leakage Transmission Power of the Directional Coupler (T-DC_1) 43-60 = -17 dBm Receive Power (R1-R2) -40 to -100 dBm Directional coupler coupling degree (C) 30 dB Detected Received Power (R1-C to R2-C) -70 to -130 dBm

Referring to Table 1, since the received signal is introduced through the wireless environment, even if the directional coupler 35 is designed to be sufficiently large, the difference between the leakage transmission signal power and the reception signal power is large, so that the leakage transmission power when measuring the reception signal in the measuring instrument. This determines the internal attenuator value, resulting in inaccurate detection of the received signal.

Table 2 below shows the detection power of the received signal in the time division duplex transceiver of FIG.

Kinds power Amplifier (AMP) transmit output (T) 43 dBm Time Division Module Isolation (TM_I) 60 dB Leakage Transmission Power (T_L = T-TM_I) 43-60 = -17 dBm Receive Path Gain (G) 60 dB Automatic Gain Control Output Limit (AGC_L) 10 dBm Splitter Loss (D) 6 dB Leakage Transmit Power Divider Output (AGC_L-D) 4 dBm Receive Signal Power (R1 ~ R2) -40 to -100 dBm Receive Signal Splitter Output (R1 + G to R2 + G) 4 to -46 dBm

Referring to Table 2, the leakage transmission power divider output T_L + G is adjusted by automatic gain control to have 4dBm. Thus, the output of the received signal divider performs AGC adjustment-divider loss (D) and outputs 4 to -46 dBm. That is, since the received signal is attenuated in a wireless environment, the difference between the transmit and receive output signals becomes large, and thus it is difficult to detect the received signal through the instrument.

As described above, when a time division duplex transceiver having the same transmit / receive frequency has a large power difference between the transmit and receive signals, when the received signal is detected to check the state of the received signal, it is difficult to detect the correct received signal by a leaked transmission signal. There is.

Accordingly, an object of the present invention is to provide an apparatus and method for attenuating a transmission leakage signal in order to detect a normal received signal in a time division duplex transceiver.

Another object of the present invention is to provide an apparatus and method for attenuating a transmission leakage signal in order to detect an accurate reception signal in a time division duplex transceiver having the same transmission / reception frequency.

 According to a first aspect of the present invention for achieving the above objects, an apparatus for detecting a received signal in a time division duplex (TDD) transceiver of a wireless communication system includes: a detector for coupling to check a received signal; And a measurement unit for receiving the coupled signal and checking whether the received signal is normally received, and a switch connecting the detection unit and the measurement unit in a reception period.

According to a second aspect of the present invention, an apparatus for detecting a received signal in a time division duplex (TDD) transceiver of a wireless communication system includes: a detector for distributing the received signal to check a received signal; And a measurement unit for receiving a signal and checking whether the received signal is normally received, and a switch connecting the detection unit and the measurement unit in a reception period.

According to a third aspect of the present invention, an apparatus for detecting a received signal in a time division duplex (TDD) transceiver of a wireless communication system includes: determining attenuation rate according to a signal detection interval of the time division duplex transceiver to receive a predetermined size or more; Attenuator for blocking a signal, a detector for distributing the received signal to check the received signal passing through the attenuator, and a measuring unit for receiving the divided signal to confirm whether the received signal is normally received. It is done.

According to a fourth aspect of the present invention, a method for detecting a received signal in a time division duplex (TDD) transceiver in a wireless communication system includes: checking a signal detection interval in the time division duplex transceiver; In this reception period, a process of connecting a detector and a measuring instrument that detect a received signal using a switch, and when the detector and the meter are connected, coupling the received signal, and whether or not the coupled signal is normal Characterized in that it comprises a process of confirming.

According to a fifth aspect of the present invention, a method for detecting a received signal in a time division duplex (TDD) transceiver in a wireless communication system includes: checking a signal detection interval in the time division duplex transceiver; In this reception period, a process of connecting a divider and a measuring instrument for detecting a received signal by using a switch, and when the divider and the measuring instrument are connected, detecting a received signal and confirming whether the coupled signal is normal. Characterized in that it comprises a process.

According to a sixth aspect of the present invention, a method for detecting a received signal in a time division duplex (TDD) transceiver of a wireless communication system includes: checking a signal detection interval of the time division duplex transceiver; The method may include determining attenuation of the received signal, attenuating the received signal according to the determined attenuation rate, and detecting the attenuated received signal to confirm whether the received signal is normal. It is done.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of related known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention.

Hereinafter, the present invention describes a technique for accurately detecting a received signal in a time division duplex transceiver using the same transmit / receive frequency. In the following description, an embodiment according to a point, an extraction method, and a control method for extracting a received signal from the time division duplex transceiver will be described. In addition, in a general time division duplex transceiver, the time division module detects data in a transmission or reception mode using a circulator or an RF switch, but it is assumed that an RF switch is used.

3 illustrates a structure of a time division duplex transceiver for detecting a received signal according to a first embodiment of the present invention. In the following description, detection of a received signal between a band pass filter and an antenna is described as an example.

As shown in FIG. 3, the time division duplex transceiver includes: a baseband processor which performs signal processing in a baseband, an intermediate frequency (IF) band, and a radio frequency (RF) band, respectively; 100), the IF unit 200, and the RF unit 300.

First, the baseband processor 100 may include a modem 110 (Modem: Modulator and Demodulator), a DUC 120 (Digital Up Converter), a DDC 140 (Digital Down Converter), and an FPGA 130 (Field Programmable Gate Array). It is configured to include).

The modem 110 (modulator & demodulator) performs modulation and demodulation of the transmission and reception signals. The DUC 120 converts the baseband transmission signal into a digital up frequency conversion to an intermediate frequency, and the DDC 140 converts the intermediate frequency band received signal into a digital down frequency conversion to a baseband signal. The FPGA 130 performs a control function set by a user.

Next, the IF unit 200 uses the DAC 210 (Digital to Analog Converter), the ADC 270 (Analog to Digital Converter) buffers 220 and 260, the frequency synthesizers 230 and 250, and the local oscillator 240. Include.

The DAC 210 converts the digital transmission signal into an analog signal, and the ADC 270 converts the analog reception signal into a digital signal. The signal converted by the DAC 210 passes through the buffer 220 and then synthesizes a transmission signal of the IF band and an output signal of the local oscillator 240 in the first frequency synthesizer 230 and converts the signal into an RF band signal. . In addition, the second frequency synthesizer 250 synthesizes the RF band reception signal and the output signal of the local oscillator 240 and converts them into IF band signals.

The local oscillator 240 down-converts the RF signal to demodulate the RF signal received by the frequency synthesizer 250 and the RF signal received by the frequency synthesizer 250 into an IF signal. Signal is generated.

Lastly, the RF unit 300 includes a high power amplifier (HPA) 310, a low noise amplifier (LNA) 330, a RF switch 320, a BPF 340 (band pass filter), and a directional coupler (D /). C: Directional Coupler) is configured to include (350).

In addition, the RF unit 300 directly radiates or receives a radio transmission / reception signal. Therefore, the transmitter uses the HPA 310, which is a high output amplifier, and the receiver, the LNA 330, which is a low noise amplifier.

The RF switch 320 is switched so that the transmission signal from the HPA 310 is connected to the band pass filter (BPF) 340 which is a band filter when the transmission is performed, and the reception signal from the BPF 340 is received when the transmission is received. Is switched to connect to the LNA 330.

The BPF 340 performs a band filtering function on the transmission signal and the reception signal. Directional coupler (D / C) 350 performs a function of coupling the transmission / reception signal to check the transmission / reception signal in the connection between the BPF 340 and the antenna. Furthermore, according to the present invention, the coupler switch 400 is used for the directional coupler 350 to connect to the measuring instrument in the receiving section, and in the transmitting section, disconnects the measuring instrument and blocks the leakage transmission signal to measure only the received signal. have.

4 illustrates an operation procedure of a time division duplex transceiver for detecting a received signal according to a first embodiment of the present invention.

Referring to FIG. 4, the time division duplex transceiver determines in step 401 whether the signal detection section is a reception section. If the signal detection section is a reception section, the time division duplex transceiver proceeds to step 403 to connect the combiner switch 400 to a measuring instrument. Thereafter, the time division duplex transceiver proceeds to step 405 in which the directional coupler 350 couples the received signal and transmits the received signal to the measuring instrument, and the measuring instrument checks the received signal using the coupled signal. The time division duplex transceiver then terminates this algorithm.

If the signal detection section is a transmission section, the time division duplex transceiver proceeds to step 407 to disconnect the combiner switch 400 from the meter. That is, the leakage transmission signal is prevented from flowing into the measuring instrument. The time division duplex transceiver then terminates this algorithm.

5 illustrates a structure of a time division duplex transceiver for detecting a received signal according to a second embodiment of the present invention. In the following description, an example of detecting a received signal between an analog / digital converter and a low noise amplifier will be described. In addition, since the overall configuration and operation of the time division duplex transceiver of FIG. 5 are the same as those of FIG.

As shown in FIG. 5, the divider 280 is positioned in front of the analog / digital converter 270 to detect the received signal. Also, the first receive path switch 410 or the second receive path switch 420 is positioned after the low noise amplifier 330 on the receive path to block the leakage transmission signal.

The reception path switches 410 and 420 connect the reception paths when the signal detection section of the time division duplex transceiver is a reception section. On the other hand, in the transmission period, the receiving path is shorted. Therefore, the divider 280 detects the received signal by connecting the receive path only in the receive period. Here, only one receive path switch 410 or 420 exists in each position as shown, but two or more receive path switches 410 and 420 may be implemented together to have sufficient isolation.

6 illustrates an operation procedure of a time division duplex transceiver for detecting a received signal according to a second embodiment of the present invention.

Referring to FIG. 6, in step 601, the time division duplex transceiver determines whether the signal detection section is a reception section. If the signal detection section is a reception section, the time division duplex transceiver proceeds to step 603 to connect the reception path switches 410 and 420 to a reception path. Thereafter, the time division duplex transceiver proceeds to step 605 and the distributor 280 distributes the received signal and checks the result of the measurement. The time division duplex transceiver ends the present algorithm.

If the signal detection section is the transmission section, the time division duplex transceiver proceeds to step 607 to short the reception path using the reception path switches 410 and 420. That is, the leakage transmission signal is prevented from flowing into the measuring instrument. The time division duplex transceiver then terminates this algorithm.

7 illustrates a structure of a time division duplex transceiver for detecting a received signal according to a third embodiment of the present invention. In the following description, an example of detecting a received signal between an analog / digital converter and a low noise amplifier will be described. In addition, since the overall configuration and operation of the time division duplex transceiver of FIG. 7 are the same as those of FIG.

As illustrated in FIG. 7, the divider 280 is positioned in front of the analog / digital converter 270 to detect the received signal. In addition, the leakage transmission signal is blocked by placing the meter switch 430 between the distributor 280 and the meter.

When the signal detection section of the time division duplex transceiver is a reception section, the meter switch 430 connects the divider 280 to the meter. On the other hand, in the transmission period, the connection between the distributor 280 and the meter is blocked to block the leakage transmission signal. Therefore, only the received signal can be detected and accurately checked only in the reception period.

8 illustrates an operation procedure of a time division duplex transceiver for detecting a received signal according to a third embodiment of the present invention.

Referring to FIG. 8, first, in step 801, the time division duplex transceiver determines whether the signal detection section is a reception section. If the signal detection section is a reception section, the time division duplex transceiver proceeds to step 803 to connect the meter switch 430 to the meter. Thereafter, the time division duplex transceiver proceeds to step 805 where the splitter 280 distributes the received signal and checks the result of the measurement. The time division duplex transceiver terminates the present algorithm.

If the signal detection section is a transmission section, the time division duplex transceiver proceeds to step 807 to release the connection with the meter using the meter switch 430. That is, the leakage transmission signal is prevented from flowing into the measuring instrument. The time division duplex transceiver then terminates this algorithm.

9 illustrates a structure of a time division duplex transceiver for detecting a received signal according to a fourth embodiment of the present invention. In the following description, an example of detecting a received signal between an analog / digital converter and a low noise amplifier will be described. In addition, since the overall configuration and operation of the time division duplex transceiver of FIG. 9 are the same as those of FIG.

As illustrated in FIG. 9, the divider 280 is positioned in front of the analog / digital converter 270 to detect the received signal. In addition, the leakage transmission signal is blocked by using an automatic gain control circuit (440). Here, the ALC circuit 440 appropriately controls the maximum size of the output signal to protect the receiver from a large signal such as leakage power in the receiver, and to prevent the received signal from saturation when the received signal is large. do.

The ALC 440 is located in front of the distributor 280 to block the leakage transmission signal. Here, a detailed configuration of the ALC 440 is shown in FIG. 9A.

As shown in FIG. 9A, the ALC 440 includes an ALC switch 441, coupling resistors 442 and 443, a control circuit 444, and an attenuator 445.

The ALC 440 couples the received signal on the receive path and then selects the coupling resistors 442 and 443 according to the signal detection interval of the time division duplex transceiver using the ALC switch 441. For example, when the signal detection section is a transmission section, the coupling resistor A 442 is connected. When the signal detection section is a reception section, the coupling resistor B 443 is connected.

The control circuit 444 receives the output signals of the coupling resistors 442 and 443 and outputs a control signal for attenuating the magnitude of the received signal to the attenuator 445. The attenuator 445 receives the control signal and attenuates the received signal and outputs the received signal to the divider 280. Here, the control circuit 444 determines the amount of attenuation of the signal using the coupling resistors 442 and 443.

10 illustrates an operation procedure of a time division duplex transceiver for detecting a received signal according to a fourth embodiment of the present invention.

Referring to FIG. 10, first, the time division duplex transceiver determines whether the signal detection section is a reception section in step 1001. If the signal detection section is a reception section, the time division duplex transceiver proceeds to step 1003 to connect the ALC switch 441 to the coupling resistor B 443.

Thereafter, the time division duplex transceiver proceeds to step 1005 and outputs a control signal of an ALC normal level, that is, attenuation rate 0, from the control circuit 444, and the time division duplex transceiver proceeds to step 1007 to transmit the received signal without attenuation. do. In operation 1009, the time division duplex transceiver couples the received signal at the splitter 280 and checks the result at the measuring instrument. The time division duplex transceiver terminates the present algorithm.

If the signal detection interval is a transmission interval, the time division duplex transceiver proceeds to step 1011, and if the ALC switch 441 is connected to the coupling resistor A 442, the time division duplex transceiver proceeds to step 1013. As a result, the control circuit 444 determines a large ALC level reduction, that is, attenuation rate.

If the attenuation rate of the signal is large, the time division duplex transceiver proceeds to step 1015 to attenuate the leaked transmission signal at the determined attenuation rate to prevent flow into the meter. The time division duplex transceiver then terminates this algorithm.

11 illustrates a structure of a time division duplex transceiver for detecting a received signal according to a fifth embodiment of the present invention. In the following description, an example of detecting a received signal between an analog / digital converter and a low noise amplifier will be described. In addition, since the overall configuration and operation of the time division duplex transceiver of FIG. 11 are the same as those of FIG.

As illustrated in FIG. 11, the divider 280 is positioned in front of the analog / digital converter 270 to detect the received signal. In addition, a digital attenuator 450 is used to block the leakage transmission signal.

The digital attenuator 450 is located between the distributor 280 and the buffer 260. The digital attenuator 450 changes the attenuation rate under the control of the programmable logic device (PLD) controller 460 to block the leakage transmission signal. For example, the signal detection section of the time division duplex transceiver transmits the received signal to the splitter 280 without attenuation at attenuation rate of zero in the reception section. On the other hand, in the transmission section, the attenuation rate is increased to suppress the leaked transmission signal.

12 illustrates an operation procedure of a time division duplex transceiver for detecting a received signal according to a fifth embodiment of the present invention.

Referring to FIG. 12, first, the time division duplex transceiver determines whether the signal detection section is a reception section in step 1201. If the signal detection section is a reception section, the time division duplex transceiver proceeds to step 1203 and when the PLD controller 460 controls the attenuation amount to zero, the time division duplex transceiver proceeds to step 1205. The received signal is transmitted to the distributor 280 without attenuation. Thereafter, the time division duplex transceiver proceeds to step 1207 in which the splitter 280 distributes the received signal and checks the result of the measurement. The time division duplex transceiver terminates the present algorithm.

If the signal detection section is a transmission section, if the time division duplex transceiver proceeds to step 1209 and the PLD controller 460 controls the attenuation amount to be large, the time division duplex transceiver proceeds to step 1211 to perform the leakage transmission signal. Attenuate to prevent flow into the meter. The time division duplex transceiver then terminates this algorithm.

13 illustrates a structure of a time division duplex transceiver for detecting a received signal according to a sixth embodiment of the present invention. In the following description, an example of detecting a received signal between an analog / digital converter and a low noise amplifier will be described. In addition, since the overall configuration and operation of the time division duplex transceiver of FIG. 13 are the same as those of FIG.

As illustrated in FIG. 13, the divider 280 is positioned in front of the analog / digital converter 270 to detect the received signal. In addition, a fixed attenuator 490 is used to block the leakage transmission signal.

When the time division duplex transceiver is a reception section, the first switch 470 and the second switch 480 are connected to the reception path to detect the reception signal. On the other hand, in the transmission period, the first switch 470 and the second switch 480 are connected to the fixed attenuator 490 to attenuate the leaked transmission signal.

14 illustrates an operation procedure of a time division duplex transceiver for detecting a received signal according to a sixth embodiment of the present invention.

Referring to FIG. 14, first, the time division duplex transceiver determines whether the signal detection section is a reception section in step 1401. If the signal detection section is a reception section, the time division duplex transceiver proceeds to step 1403 to connect the first switch 470 and the second switch 480 with a reception path. Thereafter, the time division duplex transceiver proceeds to step 1405 in which the splitter 280 distributes the received signal and checks the result of the measurement. The time division duplex transceiver terminates the present algorithm.

If the signal detection section is a transmission section, the time division duplex transceiver proceeds to step 1407 to connect the first switch 470 and the second switch 480 with the fixed attenuator 490. The time division duplex transceiver then proceeds to step 1409 to attenuate the leaked transmission signal in the fixed attenuator 490 to prevent it from flowing into the meter. The time division duplex transceiver then terminates this algorithm.

As described above, one example of the detection of the received signal of FIGS. 3 to 14 has been described as an example. However, one or more combinations may be implemented to detect the received signal.

15 shows a control signal for detecting a received signal according to the present invention.

As shown in FIG. 15, the time division module also generates a control signal for connecting the path of the time division duplex transceiver according to the transmission / reception section 1501 in the time division duplex transceiver (1503).

When the pulse of the control signal for controlling the time division module is high, that is, in the transmission section, the reception signal detector control signal generates a control signal connected to the attenuation path to block the leakage transmission signal. In operation 1505, the reception signal detector control signal generates a control signal connected to the reception path in order to detect the reception signal.

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. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, in order to check the received signal in the time division duplex transceiver, there is an advantage in that the state of the received signal can be accurately checked by blocking the leaked transmission signal when the received signal is detected.

Claims (29)

An apparatus for detecting a received signal in a time division duplex (TDD) transceiver, A detector for coupling to check the received signal; A measuring unit which receives the coupled signal and checks whether the received signal is normally received; And a switch connecting the detection unit and the measurement unit in a reception interval. The method of claim 1, The switch connects the detection unit and the measurement unit when the time division module is a reception period. And when the time division module is a transmission section, disconnecting the detection unit from the measurement unit. The method of claim 2, The time division module is any one of a switch or a circulator. The method of claim 1, And the detector uses a directional coupler located between the band pass filter and the antenna. An apparatus for detecting a received signal in a time division duplex (TDD) transceiver, A detector for distributing the received signal to check the received signal; A measuring unit which receives the divided signal and checks whether the received signal is normally received; And a switch connecting the detection unit and the measurement unit in a reception interval. The method of claim 5, The switch connects the detection unit and the measurement unit when the time division module is a reception period. And the detector is not connected to the measurement unit when the time division module is a transmission period. The method of claim 6, The time division module is any one of a switch or a circulator. The method of claim 5, The detection unit, characterized in that for using a divider located in front of the analog / digital converter. An apparatus for detecting a received signal in a time division duplex (TDD) transceiver, An attenuation unit for determining attenuation rate according to the signal detection section of the time division duplex transceiver and cutting off a received signal of a predetermined size or more; A detector for distributing the received signal to check the received signal passing through the attenuator; And a measuring unit which receives the divided signal and checks whether the received signal is normally received. The method of claim 9, The attenuation unit, and a switch for selecting a resistance value according to the signal detection section of the time division duplex transceiver; A control unit for determining attenuation rate according to the selected resistance value; And an attenuator for attenuating the received signal according to the attenuation rate determined by the controller. The method of claim 10, The attenuation unit determines the attenuation rate as 0 when the signal detection section is a reception section, And when the signal detection section is a transmission section, blocking the leakage transmission signal by increasing the attenuation rate. The method of claim 9, The attenuator includes: a programmable logic device (PLD) controller configured to change a value of the attenuator according to a time division control signal; And a digital attenuator for attenuating the received signal under the control of the PLD controller. The method of claim 12, The attenuation unit determines the attenuation rate as 0 when the signal detection section is a reception section, And when the signal detection section is a transmission section, blocking the leakage transmission signal by increasing the attenuation rate. The method of claim 9, The attenuation unit, and a switch connected to the fixed attenuator in the transmission period in accordance with the time division control signal, And a fixed attenuator for attenuating the received signal at a constant attenuation rate when the switch is connected. The method of claim 9, The detection unit, characterized in that for using a divider located in front of the analog / digital converter. What is claimed is: 1. A method for detecting a received signal in a time division duplex (TDD) transceiver. Checking a signal detection interval in the time division duplex transceiver; When the signal detection section is a reception section, connecting a detector and a measuring device to detect a received signal by using a switch; When the detector and the meter are connected, coupling a received signal; And checking whether the coupled signal is normal. The method of claim 16, If the signal detection section is a transmission section, further comprising disconnecting the detector from the instrument. The method of claim 16, The signal detection section, characterized in that for confirming using the control signal of the time division module. The method of claim 16, The coupling of the received signal is characterized in that for coupling the received signal using a directional coupler located between the band pass filter and the antenna. What is claimed is: 1. A method for detecting a received signal in a time division duplex (TDD) transceiver. Checking a signal detection interval in the time division duplex transceiver; When the signal detection section is a reception section, connecting a divider and a measuring device to detect a received signal by using a switch; Detecting the received signal when the distributor and the meter are connected; And checking whether the coupled signal is normal. The method of claim 20, And if the signal detection section is a transmission section, disconnecting the splitter from the meter. The method of claim 20, The signal detection section, characterized in that for confirming using the control signal of the time division module. The method of claim 20, The detection of the received signal is characterized in that for distributing the received signal using a divider located in the previous stage of the analog-to-digital converter. What is claimed is: 1. A method for detecting a received signal in a time division duplex (TDD) transceiver. Checking a signal detection interval of the time division duplex transceiver; Determining attenuation rate of a received signal according to the signal detection section; Attenuating the received signal according to the determined attenuation rate; And detecting whether the received signal is normal by detecting the attenuated received signal. The method of claim 24, The signal detection section, characterized in that for confirming using the control signal of the time division module. The method of claim 24, The attenuation rate, the step of selecting a resistance value according to the signal detection section, Determining attenuation rate according to the selected resistance value; And attenuating the received signal according to the determined attenuation rate. The method of claim 26, If the signal detection section is a reception section, the attenuation rate is determined as 0, And when the signal detection section is a transmission section, blocking the leakage transmission signal by increasing the attenuation rate. The method of claim 24, The attenuation rate, the process of determining the attenuation rate according to the signal detection section, And attenuating the received signal according to the determined attenuation rate. The method of claim 28, If the signal detection section is a reception section, the attenuation rate is determined as 0, And when the signal detection section is a transmission section, blocking the leakage transmission signal by increasing the attenuation rate.

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