JP7144498B2 - WAVEFORM DATA TRANSFER DEVICE, MEASUREMENT DEVICE AND MEASUREMENT SYSTEM INCLUDING THE SAME, WAVEFORM DATA TRANSFER METHOD AND MEASUREMENT METHOD - Google Patents

Description

The present invention relates to a waveform data transfer device for transferring waveform data of a signal under measurement, a measurement device and measurement system having the same, and a waveform data transfer method and measurement method.

Conventionally, under test conditions stipulated in communication standards such as LTE (Long Term Evolution) and 5G NR (New Radio), transmission from a device under test (DUT) such as a device installed in a base station A transmission test is performed to receive and analyze the transmitted signal to check the transmission performance of the DUT.

In capturing a signal under measurement and performing analysis processing, there is a case where a wideband spectrum measurement is performed by widening the frequency span by performing divided capture in the frequency axis direction (see, for example, Patent Document 1).

For example, when measuring spurious near the band in OBUE (Operating Band Unwanted Emissions) measurement defined by 3GPP, it may be necessary to measure a wider frequency span than the frequency span supported by the measuring device.

In Patent Document 1, in order to measure a broadband signal under measurement, the channel width of the signal under measurement is divided into a plurality of divided frequency ranges, and the measurement results of each of the divided frequency ranges are corrected and combined. is disclosed.

Japanese Unexamined Patent Application Publication No. 2014-93738

However, in the conventional technique described in Patent Document 1, it is necessary to divide the waveform data of the signal under measurement into a plurality of times in the frequency axis direction and perform divisional capture. When analyzing with equipment, there is a problem that the transfer time of waveform data increases in proportion to the number of divisions. For this reason, there is a problem that the inspection efficiency per unit time decreases in a measuring apparatus that involves transferring divided captured data, particularly in a measuring apparatus for a manufacturing line, and a solution has been desired.

DISCLOSURE OF THE INVENTION The present invention has been made to solve the conventional problems. It is an object of the present invention to provide a waveform data transfer device capable of shortening the measurement time by shortening the transfer time of waveform data, a measurement device and measurement system having the same, and a waveform data transfer method and measurement method.

The waveform data transfer apparatus of the present invention receives a signal under test transmitted from a device under test (2) in a time-sharing manner by switching between a transmission period and a reception period within a frame, and transfers the waveform data of the signal under measurement. A waveform data transfer apparatus (200) comprising: a divided frequency span setting section (25) for setting a plurality of divided frequency spans obtained by dividing a frequency span that is a measurement range; a receiving section (10) for generating waveform data (d) of the signal under measurement for each frequency span; a trigger generating section (23) for generating a trigger signal at frame intervals; a waveform data capture unit (21) for capturing waveform data (e) of a predetermined unit of processing based on the trigger signal from the waveform data of the signal under measurement obtained; In the main divided frequency span in which the frequency component of the data exists, the waveform data of the captured processing unit is transferred as transfer data, and in the divided frequency spans other than the main divided frequency span, the captured processing unit and a transfer data extracting section (22) for extracting and transferring waveform data of the signal under measurement corresponding to the transmission interval from the waveform data of (1) as transfer data.

As described above, in the waveform data transfer apparatus of the present invention, the transfer data extraction unit extracts the captured processing unit in the main divided frequency span in which the frequency component of the data in the transmission section exists among the plurality of divided frequency spans. For the divided frequency spans other than the main divided frequency span, the waveform data of the signal under measurement corresponding to the transmission interval is extracted and transferred as the transfer data from the captured waveform data for each processing unit. It is designed to With this configuration, unnecessary parts of the signal that do not correspond to the transmission section are not transferred, so the amount of transfer data can be reduced. Therefore, even when the broadband signal transmitted from the DUT in a time division manner is divided and captured in a plurality of times on the frequency axis, the transfer time of the dividedly captured waveform data can be shortened. Measurement time can be shortened when the measurement is performed using waveform data. Also, for the main divided frequency span, the waveform data in units of processing is transferred as transfer data, so frame synchronization processing can be performed in the transfer destination device. The "processing unit" is the time length of the waveform data captured by the waveform data capture unit 21, and is also the processing unit of frame synchronization processing.

The waveform data transfer apparatus of the present invention further includes a read offset acquisition unit (24) for acquiring a read offset value indicating a relative position of the transmission section in the captured waveform data of the processing unit, The extraction unit first transfers the waveform data of the processing unit captured in the main divided frequency span as transfer data, and then the processing unit captured in the divided frequency span other than the main divided frequency span. waveform data of the signal under measurement corresponding to the transmission interval based on the readout offset value and transferred as transfer data.

With this configuration, in the waveform data transfer apparatus of the present invention, the transfer data extraction unit can accurately extract waveform data corresponding to the transmission section from the waveform data in units of processing as transfer data based on the read offset value. .

Further, a measuring apparatus of the present invention comprises any one of the waveform data transfer apparatus described above, a transfer data acquisition section (31) for acquiring transfer data transferred from the waveform data transfer apparatus, and the transferred transfer data. a frame synchronization processing unit (32) for detecting frame timing of transfer data in the main divided frequency span; and a signal of the transferred transfer data based on the frame timing detected by the frame synchronization processing unit. and a measuring unit (34) for measuring characteristics of the demodulated signal.

With this configuration, the measuring device of the present invention includes the waveform data transfer device of the present invention, and transfers the signal of unnecessary portions not corresponding to the transmission section to the signal processing section such as the frame synchronization processing section and the demodulation section. Therefore, the amount of transfer data can be reduced. Therefore, even when an external trigger signal for frame synchronization cannot be used, and when the broadband signal transmitted from the DUT in a time division manner is divided and captured multiple times on the frequency axis, the divided capture is performed. Waveform data transfer time can be shortened, and measurement time can be shortened.

Further, in the measuring apparatus of the present invention, the frame synchronization processing section may be configured to calculate a readout offset value indicating a relative position of the transmission section in the captured waveform data of the processing unit.

With this configuration, in the measuring apparatus of the present invention, the frame synchronization processing section can accurately calculate the readout offset value. Waveform data corresponding to the transmission interval can be accurately extracted as transfer data from the waveform data in units of processing.

Further, the measurement system of the present invention is a measurement system (100) comprising a receiver (110) and a data processor (120) connected to the receiver via a communication network (130), A device includes any one of the waveform data transfer devices described above, and a transmission unit (112) that transmits transfer data generated by the waveform data transfer device to the data processing device via the communication network. , the data processing device comprises a receiving unit (122) for receiving transfer data transmitted from the transmitting unit of the receiving device; a frame synchronization processing unit (32) for detecting the frame timing, a demodulation unit (33) for demodulating the received transfer data signal based on the frame timing detected by the frame synchronization processing unit, and the demodulated signal and a measuring unit (34) for measuring characteristics.

With this configuration, the measurement system of the present invention can reduce the amount of waveform data transferred to the data processing device via the communication network by the waveform data transfer device included in the receiving device. As a result, even when an external trigger signal for frame synchronization cannot be used and when the broadband signal transmitted from the DUT in a time division manner is to be divided and captured a plurality of times on the frequency axis, division capture can be performed. It is possible to shorten the transfer time of the waveform data and shorten the measurement time.

Also, in the measurement system of the present invention, the frame synchronization processing unit calculates a readout offset value indicating a relative position of the transmission section in the captured waveform data of the processing unit, and calculates the readout offset value via the communication network. It may be configured to send to the offset acquisition unit.

With this configuration, in the measurement system of the present invention, the frame synchronization processing section can accurately calculate the readout offset value. Waveform data corresponding to the transmission interval can be accurately extracted as transfer data from the waveform data in units of processing.

A waveform data transfer method of the present invention receives a signal under test transmitted from a device under test (2) in a time-sharing manner in which transmission intervals and reception intervals are switched within a frame, and transfers the waveform data of the signal under measurement. A waveform data transfer method comprising: a divided frequency span setting step (S1) of setting a plurality of divided frequency spans obtained by dividing a frequency span that is a measurement range; a receiving step (S3 to S5) of generating waveform data (d) of the signal under measurement; a trigger generating step of generating a trigger signal in frame cycles; a waveform data capture step (S6) of capturing waveform data (e) of a predetermined unit of processing from the waveform data of the measurement signal based on the trigger signal; In the main divided frequency span where the component exists, the captured waveform data of the processing unit is transferred as transfer data, and in the divided frequency spans other than the main divided frequency span, the captured waveform data of the processing unit is transferred. and a transfer data extraction step (S7) of extracting and transferring the waveform data of the signal under measurement corresponding to the transmission interval as transfer data.

As described above, in the waveform data transfer method of the present invention, in the transfer data extraction step, among the plurality of divided frequency spans, in the main divided frequency span where the frequency component of the data in the transmission section exists, the captured processing unit For the divided frequency spans other than the main divided frequency span, the waveform data of the signal under measurement corresponding to the transmission interval is extracted and transferred as the transfer data from the captured waveform data for each processing unit. It is designed to With this configuration, unnecessary parts of the signal that do not correspond to the transmission section are not transferred, so the amount of transfer data can be reduced. Therefore, even when the broadband signal transmitted from the DUT in a time division manner is divided and captured in a plurality of times on the frequency axis, the transfer time of the dividedly captured waveform data can be shortened. Measurement time can be shortened when the measurement is performed using waveform data. Also, for the main divided frequency span, the waveform data in units of processing is transferred as transfer data, so frame synchronization processing can be performed in the transfer destination device.

A measurement method of the present invention includes the waveform data transfer method described above, a transfer data obtaining step of obtaining transfer data transferred by the waveform data transfer method, and a frame synchronization processing step (S8) for detecting the frame timing of the transfer data of the divided frequency span of , and a demodulation step for demodulating the signal of the transferred transfer data based on the frame timing detected by the frame synchronization processing step (S18), and a measuring step (S19) of measuring characteristics of the demodulated signal.

With this configuration, the measurement method of the present invention includes the waveform data transfer method of the present invention, and does not transfer unnecessary portions of the signal that do not correspond to the transmission interval so as to be used in the frame synchronization processing step, the demodulation step, and the like. Therefore, the amount of transfer data can be reduced. Therefore, even when an external trigger signal for frame synchronization cannot be used, and when the broadband signal transmitted from the DUT in a time division manner is divided and captured multiple times on the frequency axis, the divided capture is performed. Waveform data transfer time can be shortened, and measurement time can be shortened.

The measuring method of the present invention is a measuring method using a measuring system (100) comprising a receiving device (110) and a data processing device (120) connected to the receiving device via a communication network (130), In a receiving device, the waveform data transfer method described above is implemented, transfer data generated by implementing the waveform data transfer method is transmitted to the data processing device via the communication network, and in the data processing device receiving transfer data transmitted from the receiving device; detecting frame timing of transfer data of the main divided frequency span among the received transfer data; demodulating the transferred data signal, and measuring characteristics of the demodulated signal.

With this configuration, the measuring method of the present invention can reduce the amount of waveform data transferred to the data processing device via the communication network by the waveform data transfer device provided in the receiving device. As a result, even when an external trigger signal for frame synchronization cannot be used and when the broadband signal transmitted from the DUT in a time division manner is to be divided and captured a plurality of times on the frequency axis, division capture can be performed. It is possible to shorten the transfer time of the waveform data and shorten the measurement time.

According to the present invention, even when the signal under measurement transmitted from the DUT in a time-division manner is divided and captured in a plurality of times on the frequency axis, the transfer time of the divided-captured waveform data can be shortened to shorten the measurement time. can be shortened, a measuring device and a measuring system provided with the same, and a waveform data transferring method and a measuring method.

1 is a block diagram showing the configuration of a measuring device according to a first embodiment of the present invention; FIG. FIG. 4 is a spectrum diagram obtained by combining spectra obtained by measuring waveform data divided and captured for each divided frequency span; 2 is a diagram showing a timing chart of each signal generated in the waveform data transfer device of the measuring device of FIG. 1; FIG. It is a figure which shows the flowchart of the measuring method based on the 1st Embodiment of this invention. FIG. 4 is a block diagram showing the configuration of a measurement system according to a second embodiment of the present invention; FIG. 6 is a diagram showing an example of how the measurement system of FIG. 5 is used; FIG.

[First embodiment]
A first embodiment of the present invention will be described with reference to the drawings.

A measuring apparatus 1 according to the first embodiment of the present invention receives and demodulates a modulated signal a transmitted from a device under test (DUT) 2 and measures the signal characteristics, thereby testing the transmission performance of the DUT 2. It is. For this purpose, the measuring apparatus 1 includes a waveform data transfer device 200, a signal processing section 30, a display section 40, an operation section 50, and a control section 60, as shown in FIG.

Examples of the DUT 2 include, but are not limited to, an RRH (Remote Radio Head) of a radio base station. The modulated signal a transmitted from the DUT 2 is an OFDM modulated signal modulated by, for example, an orthogonal frequency division multiplexing (OFDM) system according to communication standards such as LTE, LTE-Advanced, 5G NR, and wireless LAN. The modulated signal a is also called a signal under measurement. Modulated signal a is obtained by performing OFDM modulation, up-conversion, etc. on a data sequence in which a known data sequence (synchronization frame) is inserted at a specific position on the time axis within a frame on the transmitting side (DUT 2). is a signal Also, the modulated signal a is transmitted from the DUT 2 in a time-division method in which the transmission period and the reception period are switched within a frame. In this embodiment, 5G NR is assumed as the communication standard, and a modulated signal modulated by the OFDM system is received. However, the communication standard and the modulation system are not limited to these. Each component will be described below.

(waveform data transfer device)
The waveform data transfer apparatus 200 receives the modulated signal a, which is the signal under measurement, transmitted from the DUT 2 in a time division manner in which the transmission period and the reception period are switched within a frame, and transfers the waveform data of the signal under measurement. ing. Specifically, the waveform data transfer device 200 includes a receiver 10 , a transfer data generator 20 , and a divided frequency span setter 25 .

(Division frequency span setting section)
The divided frequency span setting unit 25 sets a plurality of divided frequency spans obtained by dividing the frequency span that is the measurement range. For example, when the frequency span to be measured is 4 GHz and the frequency span supported by the measuring apparatus 1 is 1 GHz, the divided frequency span setting unit 25 sets the frequency span to be measured, 4 GHz, to the first to fifth divided frequency spans. It is divided into 5 (segment 0, segment 1, segment 2, segment 3, segment 4) (see FIG. 2). The divided frequency span setting unit 25 may set a plurality of divided frequency spans input by the user operating the operation unit 50, for example. Alternatively, the divided frequency span setting unit 25 may be set by the control unit 60 based on information on the frequency span that can be measured by the measuring device 1 and the frequency span that is the measurement range, for example. The number of divisions may be odd or even.

(receiving part)
The receiving section 10 receives the modulated signal a, which is the signal under measurement, and generates waveform data of the signal under measurement for each divided frequency span. Specifically, the receiving unit 10 receives the modulated signal a transmitted from the DUT 2 in a time-division manner that switches between a transmission period (ON period or simply ON) and a reception period (OFF period or simply OFF) within a frame. is received via an antenna or via a cable, down-converted, sampled, and quadrature demodulated for each divided frequency span to generate a quadrature demodulated signal d (also called waveform data of the signal under test). ing. For this purpose, the receiver 10 includes a down converter 11 , an analog-to-digital converter (A/D converter) 12 , and a quadrature demodulator 13 .

The down-converter 11 includes a mixer and a local oscillator, inputs the modulated signal a transmitted from the DUT 2 and the local signal generated by the local oscillator into the mixer, down-converts them, and produces an intermediate frequency (IF) signal b. It is designed to generate The intermediate frequency signal b is sent to the A/D converter 12 .

The A/D converter 12 samples the intermediate frequency signal b frequency-converted by the down-converter 11 and converts it from an analog signal to a digital signal. The obtained digital intermediate frequency signal c is sent to the quadrature demodulator 13 .

The quadrature demodulator 13 frequency-converts the digital intermediate frequency signal c output from the A/D converter 12 into a baseband signal, and quadrature demodulates it into an I-phase component and a Q-phase component. The obtained quadrature demodulated signal d is sent to the waveform data capture section 21 of the transfer data generation section 20 . The quadrature demodulated signal d is a complex signal.

In the above description, the reception section 10 converts the signal into an intermediate frequency signal in the downconverter 11, but the downconverter 11 may convert the signal into a baseband signal.

(Transfer data generator)
The transfer data generator 20 extracts a necessary portion from the quadrature demodulated signal d (waveform data of the signal under measurement) generated for each divided frequency span, and generates transfer data for each divided frequency span. there is Specifically, the transfer data generation unit 20 includes a waveform data capture unit 21 , a transfer data extraction unit 22 , a frame trigger generation unit 23 and a readout offset acquisition unit 24 .

The frame trigger generator 23 is adapted to generate a frame trigger signal g in frame cycles. The cycle of the generated frame trigger signal g is the same as the frame cycle (10 milliseconds) included in the modulated signal a, which is the input signal, but the rise of the frame trigger signal g coincides with the start point of the frame. you don't have to be Note that the frame trigger generator of this embodiment corresponds to the trigger generator of the present invention.

The waveform data capture unit 21 captures (divided captures) waveform data e of a predetermined processing unit from the quadrature demodulated signal d based on the frame trigger signal g generated by the frame trigger generation unit 23 for each divided frequency span. It's like Here, the processing unit is the amount of data handled at once in processing such as data capture, transfer, frame synchronization, etc., and is represented by time length or data length (number of data, number of samples, etc.). The divided captured waveform data e is sent to the transfer data extractor 22 .

The readout offset acquisition unit 24 acquires from the frame synchronization processing unit 32 the information of the readout offset value k indicating the relative position of the transmission section in the dividedly captured waveform data e of the processing unit.

The transfer data extracting unit 22 transfers, as transfer data f, the divided captured waveform data e of the processing unit in the main divided frequency span in which the frequency component of the data in the transmission section exists among the plurality of divided frequency spans, In the divided frequency spans other than the main divided frequency span, the waveform data of the signal under measurement corresponding to the transmission section is extracted and transferred as the transfer data f from the divided captured waveform data e of the unit of processing. A “main divided frequency span” is a divided frequency span in which the main frequency components of the data in the transmission section are present. The extracted transfer data f is transferred to the transfer data acquisition section 31 of the signal processing section 30 .

(signal processor)
The signal processing unit 30 performs signal processing such as frame synchronization processing and OFDM demodulation processing on the transfer data transferred from the transfer data extraction unit 22 of the waveform data transfer device 200, and performs various measurements. ing. Specifically, the signal processing unit 30 includes a transfer data acquisition unit 31, a frame synchronization processing unit 32, an OFDM demodulation unit 33, and a measurement unit .

The transfer data acquisition unit 31 acquires the transfer data transferred from the transfer data extraction unit 22 of the waveform data transfer device 200, and stores it in association with the divided frequency span. The acquired transfer data is sent to the frame synchronization processor 32 and the OFDM demodulator 33 .

The frame synchronization processing unit 32 detects frame timing based on the transfer data of the main divided frequency span acquired by the transfer data acquisition unit 31, and outputs a frame timing signal j indicating the detection to the OFDM demodulation unit 33. It's like The frame synchronization process may be performed by a known method. For example, the correlation calculation between the partial waveform data of one frame length extracted from the transfer data of the signal length of two frames and the known reference frame is performed while shifting the extraction position. The frame timing may be detected by executing and searching for the peak of the correlation value.

Based on the detected frame timing, the frame synchronization processing unit 32 also calculates a readout offset value k indicating the length of time from the rise of the frame trigger to the readout start position, and outputs it to the readout offset acquisition unit 24 . ing.

The OFDM demodulator 33 demodulates the transfer data signal transferred from the waveform data transfer device 200 based on the frame timing j detected by the frame synchronization processor 32 . Specifically, the OFDM demodulation unit 33 performs OFDM demodulation processing such as FFT (Fast Fourier Transform) processing and subcarrier demodulation on the transfer data acquired by the transfer data acquisition unit 31 based on the frame timing signal j. to generate an OFDM demodulated signal m. The generated OFDM demodulated signal m is sent to the measuring section 34 . Note that the OFDM demodulator 33 in this embodiment corresponds to the demodulator of the present invention.

If necessary, the CP (Cyclic Prefix) is removed from each symbol of the transfer data before the OFDM demodulator 33 performs FFT processing.

The measurement unit 34 is configured to measure and analyze frequency error, timing error, EVM (Error Vector Magnitude), transmission power, constellation, etc., for the OFDM demodulated signal m output from the OFDM demodulation unit 33. ing. Information n of the measurement and analysis results by the measurement unit 34 is sent to the display unit 40 .

(Display unit, operation unit, control unit)
The display unit 40 has a display device such as a liquid crystal display, and displays the test results of the DUT 2 including the data and graphs of the measurement and analysis results sent from the measurement unit 34 on the display device. .

The operation unit 50 is operated by the user to set various parameters in addition to measurement items, measurement conditions, and determination conditions when testing the DUT 2 . Specifically, the operation unit 50 includes, for example, a keyboard configured with a touch panel or hardware keys, an input device such as a mouse or a dial, a control circuit for controlling these devices, and the like.

The control unit 60 receives input from the operation unit 50, sets various parameters, etc., and functions as the reception unit 10, the transfer data generation unit 20, the divided frequency span setting unit 25, the signal processing unit 30, the display unit 40, and the like. It is designed to control the part.

<Split capture>
Next, when measuring a frequency span wider than the frequency span supported by the measuring apparatus 1, a method of dividing the frequency span and capturing waveform data for each divided frequency span (divided capture) will be described.

FIG. 2 is a diagram showing the measurement results of OBUE, and is a spectral diagram obtained by combining respective spectra of waveform data obtained by divisional capture. In the example of FIG. 2, the frequency span to be measured is approximately 4 GHz, and the frequency span of 4 GHz is divided into five, each divided frequency span being approximately 800 MHz. In one capture, the range is slightly wider than 800 MHZ, and the so-called margin for coupling is included. The divided frequency spans (also called segments) are segment 1, segment 2, segment 0, segment 3, and segment 4 in order from the left in FIG. is.

In FIG. 2, the main frequency components of the waveform data exist within the frequency range of segment 0 where the center frequency cf0 is ±0 MHz, and almost no frequency components of the waveform data exist in the other segments 1 to 4. not Segment 0, where the main frequency components of the waveform data are present, is called the main segment or center segment.

<Action>
Next, the operation of waveform data transfer device 200 will be described with reference to FIG.

FIG. 3 is a timing chart of signals generated in the waveform data transfer device 200. As shown in FIG. The first stage in FIG. 3 shows an input signal (modulated signal a) input from the DUT 2 (for example, base station equipment) to the waveform data transfer apparatus 200 . The DUT 2 is switched between a transmission period and a reception period within a frame by a time division method. The input signal includes a plurality of frames each having a time length of 10 milliseconds, and each frame includes an "On period" and an "Off period". The On period corresponds to the transmission period in DUT2, and the Off period corresponds to the reception period in DUT2.

The second row in FIG. 3 shows the internal frame trigger signal g generated by the frame trigger generator 23. FIG. The internal frame trigger signal g is generated with a frame cycle, that is, a cycle of 10 milliseconds. The start time of the frame trigger signal g and the start time of the frame included in the input signal (first stage) to the waveform data transfer device 200 need not coincide. That is, the frame trigger generation unit 23 generates the frame trigger signal g in a frame period independently of the frame of the input signal.

The third row in FIG. 3 shows the waveform data e divided and captured by the waveform data capture section 21 based on the frame trigger signal g generated by the frame trigger generation section 23 . The waveform data capture unit 21 captures segment 0 (center frequency cf0=±0), segment 1 (center frequency cf1≠±0), segment 2 (center frequency cf2≠±0), segment 3 (center frequency cf3≠±0). , segment 4 (center frequency cf4≠±0). The time length (data length) of the waveform data e captured in each segment is the frame synchronization processing unit PU+pre-sample+post-sample. For example, the frame synchronization processing unit PU is two frames, ie, 20 milliseconds. Each time length of pre-sampling and post-sampling is, for example, 1.1 milliseconds. Therefore, the time length of the waveform data e dividedly captured for each segment is 22.2 milliseconds.

Here, pre-sampling and post-sampling are margins required when performing pre-processing such as filtering. In other words, in order to suppress the transient response that occurs when performing band-limiting filtering only on the input signal, pre-samples of a predetermined length are added before the data string of the processing unit PU, and post-samples of a predetermined length are added after. captured in .

The fourth row in FIG. 3 shows the transfer data f generated by the transfer data extractor 22 (that is, waveform data to be transferred). The transfer data extraction unit 22 first transfers the waveform data e of the processing unit captured by the waveform data capture unit 21 for the segment 0 (center frequency cf0=±0) as transfer data f. The frame synchronization processing unit 32 of the signal processing unit 30 performs a known frame synchronization process using the transferred transfer data f (waveform data of processing unit), and at the start of the On section from the rise of the frame trigger signal g. An offset value indicative of the time until is obtained, and a readout offset value k that takes pre-sampling into consideration is calculated from the offset value. The readout offset value k indicates the time from the frame trigger signal g to the start of readout.

Next, the transfer data extraction unit 22 extracts the waveform data e of the processing unit captured by the waveform data capture unit 21 for the segments 1, 2, 3, and 4 of the center frequencies cf1, cf2, cf3, and cf4 (≠±0). Waveform data corresponding to the On section (transmission section) is transferred as transfer data. Specifically, the transfer data extraction unit 22 extracts the waveform data e of the unit of processing captured by the waveform data capture unit 21, based on the frame trigger signal g, from the read offset value k to the On interval (transmission interval) + The range up to pre-sample + post-sample is extracted and transferred as transfer data. In this specification and claims, even if it is not explicitly stated, the waveform data e and the transfer data f actually include the pre-sample + post-sample portion. do.

As described above, in the segments 1 to 4 other than the center segment 0, by using the frame trigger signal g of the frame period (10 ms) and the readout offset value k, the waveform data of only the On period is transferred to the signal processing unit 30. make sure to On the other hand, only the center segment 0 performs frame synchronization processing, and since it is necessary to find the timing of the On section in the 10 ms period, the waveform data of the entire section of the processing unit is transferred.

The measurement device 1 and the waveform data transfer device 200 according to the first embodiment include, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input/output interface, and a storage device such as a hard disk. etc. individually or as a whole. As a result, for example, some or all of the functions of the receiving unit 10, the transfer data generating unit 20, the divided frequency span setting unit 25, the signal processing unit 30, the display unit 40, the operation unit 50, the control unit 60, etc. It can be realized by reading various processing programs stored in the storage device to the RAM and executing them by the CPU.

The waveform data transfer device 200 may be integrated with the measuring device 1 and share a computer with the measuring device 1 . Also, the waveform data transfer device 200 may be application software (program) installed in the computer of the measurement device 1 .

Next, the measuring method according to this embodiment will be described with reference to FIG.

The divided frequency span setting unit 25 sets a plurality of divided frequency spans obtained by dividing the frequency span to be measured (step S1). The divided frequency span (segment) may be set by the user operating the operation unit 50, for example. Specifically, the divided frequency span setting unit 25 sets the frequency span and center frequency of each segment.

Next, after performing the first transfer process, the second and subsequent transfer processes are performed.

<First transfer process>
The receiving unit 10 acquires the center frequency and frequency span of the segment 0 set by the divided frequency span setting unit 25, and sets the receiving unit 10 (step S2). Segment 0 is a divided frequency span (also referred to as “main divided frequency span”) in which the center frequency cf0=±0 and the main frequency components of the data in the transmission section exist.

The DUT 2 transmits an OFDM modulated signal modulated by, for example, an OFDM system in accordance with a communication standard such as 5G NR in a time division manner. The receiver 10 receives the modulated signal a transmitted from the DUT 2 in a time division manner.

Downconverter 11 downconverts modulated signal a transmitted from DUT 2 for segment 0 to generate intermediate frequency (IF) signal b (step S3).

The A/D converter 12 samples the intermediate frequency signal b frequency-converted by the down converter 11 and converts it from an analog signal to a digital signal (step S4). The A/D converter 12 sends the obtained digital intermediate frequency signal c to the quadrature demodulator 13 .

The quadrature demodulator 13 frequency-converts the digital intermediate frequency signal c output from the A/D converter 12 into a baseband signal, and quadrature demodulates it into an I-phase component and a Q-phase component (step S5).

A frame trigger generator 23 generates a frame trigger signal g in a frame period. The period of the generated frame trigger signal g is the same as the period (10 milliseconds) of the frame included in the input signal, but the rise of the frame trigger signal and the starting point of the frame do not have to match.

Based on the frame trigger signal g generated by the frame trigger generator 23, the waveform data capture unit 21 captures the waveform data e of a predetermined processing unit from the quadrature demodulated signal d for the segment 0 with the center frequency cf0=±0. (step S6). Here, the processing unit is the amount of data handled at one time in frame synchronization processing of data, for example, two frames (20 milliseconds).

The transfer data extracting unit 22 uses the waveform data e of the processing unit captured in segment 0, which is the main (central) segment in which the main frequency component of the data in the transmission interval exists, as transfer data f. The generated transfer data f is transferred to the transfer data acquisition unit 31 of the signal processing unit 30 (step S7).

The transfer data acquisition unit 31 acquires the transfer data f (waveform data) transferred from the transfer data extraction unit 22 of the waveform data transfer device 200, and stores it in association with the segment.

The frame synchronization processing unit 32 detects frame timing based on the transfer data acquired by the transfer data acquisition unit 31, and outputs a frame timing signal j indicating the detection to the OFDM demodulation unit 33 (step S8).

Based on the detected frame timing, the frame synchronization processing unit 32 also calculates a readout offset value k indicating the time length from the frame trigger signal g to the readout start position of the waveform data, and outputs the readout offset value k to the readout offset acquisition unit 24 . .

The readout offset acquisition unit 24 of the waveform data transfer device 200 acquires information on the readout offset value k calculated by the frame synchronization processing unit 32 (step S9).

<Second and subsequent transfer processing>
The receiving unit 10 acquires the center frequency and frequency span of segments other than the segment 0 set by the divided frequency span setting unit 25, and sets the receiving unit 10 (step S10).

Down-converter 11 down-converts modulated signal a transmitted from DUT 2 for segment n (n=1, . . . , 4) to generate intermediate frequency (IF) signal b (step S11). The A/D converter 12 samples the intermediate frequency signal b frequency-converted by the down-converter 11 and converts it from an analog signal to a digital signal (step S12). The quadrature demodulator 13 frequency-converts the digital intermediate frequency signal c output from the A/D converter 12 into a baseband signal, and quadrature demodulates it into an I-phase component and a Q-phase component (step S13).

Based on the frame trigger signal g generated by the frame trigger generator 23, the waveform data capture unit 21 captures the waveform data e of a predetermined processing unit from the quadrature demodulated signal d for the segment n (step S14).

The transfer data extraction unit 22 extracts, as transfer data f, a portion corresponding to the transmission interval from the waveform data e of the processing unit captured for the segment n (step S15). The generated transfer data f is transferred to the transfer data acquisition unit 31 of the signal processing unit 30 (step S16).

Under the control of the controller 60, it is determined whether or not the waveform data of all segments have been captured and transferred (step S17). If all segments have not been completed (NO in step S17), the process returns to step S10, and if all segments have been completed (YES in step S17), the process proceeds to next step S18.

In step S18, the OFDM demodulation unit 33 performs OFDM demodulation processing such as FFT processing and subcarrier demodulation on the transfer data i acquired by the transfer data acquisition unit 31 based on the frame timing signal j. A signal m is generated and output to the measurement unit 34 .

The measurement unit 34 measures and analyzes, for example, frequency error, timing error, EVM, transmission power, constellation, etc., of the OFDM demodulated signal m output from the OFDM demodulation unit 33 (step S19).

The display unit 40 displays the test results of the DUT 2 on the display device, including data, graphs, etc. of the measurement and analysis results sent from the measurement unit 34 (step S20).

As described above, in the waveform data transfer device 200 and the measurement device 1 according to the present embodiment, the transfer data extracting unit 22 firstly selects the main divided frequency span (segment 0) is transferred as transfer data, and from the second time onwards, among the waveform data of the processing unit captured for the divided frequency spans (segments 1 to 4) other than the main divided frequency span, Waveform data of a portion corresponding to the transmission interval is extracted and transferred as transfer data. With this configuration, unnecessary parts of the signal that do not correspond to the transmission section are not transferred, so the amount of transfer data can be reduced. Therefore, even when the broadband signal transmitted from the DUT 2 in a time division manner is divided and captured multiple times on the frequency axis, it is possible to shorten the transfer time of the dividedly captured waveform data, thereby shortening the measurement time. can be shortened. Also, for the main divided frequency span, the waveform data in units of processing is transferred as the transfer data, so that frame synchronization processing can be performed in the frame synchronization processing unit 32 of the transfer destination.

<Specific reduction effect>
Specifically, when the processing unit of the frame synchronization processing in the frame synchronization processing unit 32 is two frames (20 milliseconds), the time length of the waveform data e captured by the waveform data capture unit 21 is expressed by the following equation. be.
Assuming that the time length of the captured waveform data e=processing unit+pre-sample+post-sample pre-sample+post-sample=2.2 ms, the time length of the captured waveform data e is 22.2 ms.

The transfer time when the transfer time is not shortened is as follows.
Transfer time = 22.2ms x 5 captures = 111ms

When the transfer time is shortened according to this embodiment, the transfer time is as follows, assuming that the On period is 1 ms.
Transfer time = (22.2 ms x 1 time) + (3.2 ms x 4 times) = 35 ms

Therefore, the waveform data transfer time in the present embodiment is shortened to 35 ms/111 ms×100%=approximately 31.5% of the case where the transfer time is not shortened.

[Second embodiment]
Next, a measurement system 100 according to a second embodiment of the invention will be described.

The measuring system 100 according to the second embodiment is similar to the measuring apparatus according to the first embodiment in that the receiving device 110 and the data processing device 120 are connected via a communication network 130 such as a LAN (Local Area Network). is different from 1. The same components are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.

In the measurement system 100 according to the present embodiment, the reception device 110 receives the modulated signal a transmitted from the DUT 2 to capture waveform data, and the data processing device 120 demodulates and measures the signal characteristics of the DUT 2. It tests transmission performance. Specifically, as shown in FIG. 5, the measurement system 100 includes a receiver 110, a data processor 120, and a communication network 130 such as a LAN that connects the receiver 110 and the data processor 120. there is

(receiving device)
The receiving device 110 receives the modulated signal a transmitted from the DUT 2 , captures waveform data, extracts transfer data from the captured waveform data, and transmits the transfer data to the data processing device 120 . For this purpose, the receiver 110 includes a waveform data transfer device 200 and a transmitter/receiver 112 .

The waveform data transfer device 200 has a configuration similar to that of the first embodiment.

The transmission/reception unit 112 transmits the transfer data f generated by the transfer data extraction unit 22 to the data processing device 120 via the communication network 130 . Further, the transmitting/receiving unit 112 receives information of the readout offset value k output from the frame synchronization processing unit 32 of the data processing device 120 via the communication network 130 and outputs the information to the readout offset acquisition unit 24 . . Further, the transmitting/receiving section 112 receives information on the divided frequency span input by the user by operating the operation section 50 of the data processing device 120 and sends the information to the divided frequency span setting section 25 . The transmitting/receiving section 112 of this embodiment corresponds to the transmitting section of the present invention.

(data processor)
The data processing device 120 receives the transfer data transmitted from the receiving device 110, performs frame synchronization and OFDM demodulation on the received transfer data, and then performs various measurements. For this purpose, the data processing device 120 includes a transmission/reception section 122 , a signal processing section 30 , a display section 40 , an operation section 50 and a control section 60 .

The transmitting/receiving section 122 receives the transfer data f sent from the transmitting/receiving section 112 of the receiving device 110 via the communication network 130 as waveform data. Further, the transmitting/receiving section 122 transmits information on the readout offset value k obtained by the frame synchronization processing section 32 to the receiving device 110 . Further, the transmitting/receiving section 122 transmits to the receiving apparatus 110 the information s of the divided frequency span input by the user by operating the operating section 50 of the data processing apparatus 120 . The transmitting/receiving section 122 of this embodiment corresponds to the receiving section of the present invention.

FIG. 6 is a diagram showing how the measurement system 100 according to this embodiment is used. As shown in FIG. 6, a signal transmitted from a DUT 2 (for example, RRH) installed in an OTA (Over The Air) chamber 300 is sent to the measurement system 100 via an antenna 301 and an RF switch 302 . A signal transmitted from the DUT 2 is, for example, a millimeter wave or a sub-6 GHz band (Sub6) signal.

In measurement system 100 , receiver 110 and data processor 120 are connected by communication network 130 . In FIG. 6, an RF converter 11a is provided between the RF switch 302 and the data processing device 120. FIG. The receiving device 110 transmits the captured waveform data (I-phase component data and Q-phase component data) to the data processing device 120 via the communication network 130 . The receiver 110 also sends out control signals for controlling the RF switch 302 and the DUT 2 .

In FIG. 6, the signal transmitted from the DUT 2 set in the OTA chamber 300 is input to the measurement system 100 via the antenna 301 and the RF switch 302, but it is not limited to this. A configuration in which the signal transmitted from the DUT 2 is input to the measurement system 100 by wire without using the OTA chamber 300 may be used.

Next, the measuring method in this embodiment will be described.

In the first embodiment, the transfer data extraction unit 22 transfers the transfer data f to the transfer data acquisition unit 31 of the signal processing unit 30 in steps S7 and S16 of FIG. In the second embodiment, the transmission/reception unit 112 of the reception device 110 transmits the transfer data f generated by the transfer data extraction unit 22 to the data processing device 120 via the communication network 130 . Steps other than steps S7 and S16 are the same as in the first embodiment.

As described above, the measurement system 100 according to the second embodiment reduces the amount of transfer data transferred to the data processing device 120 via the communication network 130 by the waveform data transfer device 200 included in the receiving device 110. be able to. As a result, even when an external trigger signal for frame synchronization cannot be used and when the broadband signal transmitted from the DUT 2 in a time division manner is divided and captured multiple times on the frequency axis, division capture can be performed. It is possible to shorten the transfer time of the waveform data, thereby shortening the measurement time.

<Another frame synchronization process>
In the first and second embodiments, the data processing unit in the frame synchronization processing was two frames worth of time, but it is not limited to this. The frame synchronization processing unit 32 may perform frame synchronization processing on the waveform data having a signal length of approximately one frame captured from the input signal. Assume that the input signal has known symbols at specific positions in the frame. A data string having the same data string as the known symbol is used as a reference symbol. Correlation calculation between the partial waveform data of one symbol length extracted from the captured waveform data of one frame and the reference symbol is performed while shifting the extraction position. Frame timing can be detected from the peak of the correlation value.

Specifically, the data length of the waveform data captured by the waveform data capture unit 21 is set to 1 frame + 1 subframe, and the frame synchronization processing unit 32 also captures waveforms with a data length (processing unit) of 1 frame + 1 subframe. Frame synchronization processing is performed on the data. In other words, the waveform data captured by the waveform data capture unit 21 does not necessarily include the entire same frame consisting of subframes 0 to 9, but if the preceding and succeeding frames include a time length (11 subframes) equivalent to one frame. good. With this configuration, the amount of data handled at one time in processes such as data capture, transfer, and frame synchronization can be reduced, and measurement time can be shortened.

<Specific reduction effect>
The effects of performing the above-described different frame synchronization processing will be described. When the processing unit of the frame synchronization processing in the frame synchronization processing section 32 is 11 subframes (11 ms), the time length of the waveform data e captured by the waveform data capture section 21 is expressed by the following equation.
Assuming that time length of waveform data e to be captured=processing unit+pre-sample+post-sample pre-sample+post-sample=2.2 ms, the time length of waveform data e to be captured is 13.2 ms.

The transfer time when the transfer time is not shortened is as follows.
Transfer time = 13.2ms x 5 captures = 66ms

When the transfer time is shortened according to this embodiment, the transfer time is as follows, assuming that the On period is 1 ms.
Transfer time = (13.2 ms x 1 time) + (3.2 ms x 4 times) = 26 ms

Therefore, the waveform data transfer time in this embodiment is shortened to 26 ms/66 ms×100%=approximately 39.4% of the case where the transfer time is not shortened.

In the above-described first and second embodiments, in the divided frequency spans (segments 1 to 4) other than the main divided frequency span (central segment 0), the data processing device 120 (or the signal processing unit 30), it is possible to shorten the transfer time of the dividedly captured waveform data. In the future, even if measurements are desired where the bandwidth of the segments other than the central segment is wider than the bandwidth of the central segment, the greater the ratio of the bandwidth of all the non-central segments to the central segment bandwidth, the greater the waveform This enhances the effect of shortening the data transfer time. As a result, it is possible to shorten the measurement time per DUT in the production line.

INDUSTRIAL APPLICABILITY As described above, the present invention shortens the transfer time of dividedly captured waveform data even when the signal under measurement transmitted from the DUT in a time division manner is divided and captured in a plurality of times on the frequency axis. It is useful for the waveform data transfer device, the measurement device and measurement system having the same, and the waveform data transfer method and measurement method as a whole.

1 measuring device 2 DUT (object to be measured)
REFERENCE SIGNS LIST 10 reception unit 11 down converter 11a RF converter 12 A/D conversion unit 13 quadrature demodulation unit 20 transfer data generation unit 21 waveform data capture unit 22 transfer data extraction unit 23 frame trigger generation unit (trigger generation unit)
24 read offset acquisition unit 25 divided frequency span setting unit 30 signal processing unit 31 transfer data acquisition unit 32 frame synchronization processing unit 33 OFDM demodulation unit (demodulation unit)
34 measurement unit 40 display unit 50 operation unit 60 control unit 100 measurement system 110 receiver 112 transmission/reception unit (transmission unit)
120 data processor 122 transceiver (receiving unit)
130 communication network 200 waveform data transfer device 300 OTA chamber 301 antenna 302 RF switch a modulated signal (measured signal, input signal)
b Intermediate frequency signal c Digital intermediate frequency signal d Quadrature demodulated signal (waveform data of signal under test)
e Waveform data (captured waveform data per unit of processing)
f Transfer data (waveform data to transfer)
g Frame trigger signal (trigger signal)
h read offset value i transfer data (acquired transfer data)
j frame timing signal k read offset value m OFDM demodulated signal n measurement and analysis result information s divided frequency span information

Claims (10)

A waveform data transfer device (200) for receiving a signal under test transmitted from a device under test (2) in a time-sharing manner by switching between a transmission period and a reception period within a frame, and transferring waveform data of the signal under measurement. hand,
a divided frequency span setting unit (25) for setting a plurality of divided frequency spans obtained by dividing the frequency span that is the measurement range;
a receiver (10) that receives the signal under measurement and generates waveform data (d) of the signal under measurement for each of the divided frequency spans;
a trigger generator (23) that generates a trigger signal in a frame period;
a waveform data capture section (21) for capturing waveform data (e) of a predetermined processing unit based on the trigger signal from the generated waveform data of the signal under measurement for each of the divided frequency spans;
Among the plurality of divided frequency spans, in the main divided frequency span in which the frequency component of the data in the transmission section exists, the captured waveform data of the unit of processing is transferred as transfer data, and the waveform data is transferred as transfer data other than the main divided frequency span. a transfer data extraction unit (22) for extracting and transferring, as transfer data, waveform data of the signal under measurement corresponding to the transmission interval from the captured waveform data of the processing unit in the divided frequency span of
A waveform data transfer device comprising: further comprising a readout offset acquisition unit (24) that acquires a readout offset value indicating the relative position of the transmission section in the captured waveform data of the processing unit,
The transfer data extraction unit first transfers the waveform data of the processing unit captured in the main divided frequency span as transfer data, and then transfers the waveform data captured in the divided frequency span other than the main divided frequency span. 2. The waveform data transfer apparatus according to claim 1, wherein the waveform data of the signal under measurement corresponding to the transmission interval is extracted as transfer data from the waveform data of the processing unit based on the readout offset value and transferred. a waveform data transfer device according to claim 1 or 2;
a transfer data acquisition unit (31) for acquiring transfer data transferred from the waveform data transfer device;
a frame synchronization processing unit (32) for detecting frame timing of transfer data of the main divided frequency span among the transferred transfer data;
a demodulator (33) for demodulating the transferred transfer data signal based on the frame timing detected by the frame synchronization processor;
a measuring unit (34) for measuring characteristics of the demodulated signal;
measuring device with 4. The measuring apparatus according to claim 3, wherein said frame synchronization processing unit calculates a readout offset value indicating a relative position of said transmission section in said captured waveform data of said unit of processing. A measurement system (100) comprising a receiver (110) and a data processor (120) connected to the receiver by a communication network (130),
The receiving device
a waveform data transfer device according to claim 1 ;
a transmission unit (112) for transmitting transfer data generated by the waveform data transfer device to the data processing device via the communication network;
The data processing device is
a receiving unit (122) for receiving transfer data transmitted from the transmitting unit of the receiving device;
a frame synchronization processing unit (32) for detecting frame timing of transfer data of the main divided frequency span among the received transfer data;
a demodulator (33) for demodulating the received transfer data signal based on the frame timing detected by the frame synchronization processor;
a measuring unit (34) for measuring characteristics of the demodulated signal;
measuring system with A measurement system (100) comprising a receiver (110) and a data processor (120) connected to the receiver by a communication network (130),
The receiving device
a waveform data transfer device according to claim 2 ;
a transmission unit (112) for transmitting transfer data generated by the waveform data transfer device to the data processing device via the communication network;
The data processing device is
a receiving unit (122) for receiving transfer data transmitted from the transmitting unit of the receiving device;
a frame synchronization processing unit (32) for detecting frame timing of transfer data of the main divided frequency span among the received transfer data;
a demodulator (33) for demodulating the received transfer data signal based on the frame timing detected by the frame synchronization processor;
a measuring unit (34) for measuring characteristics of the demodulated signal;
measuring system with 7. The frame synchronization processing unit calculates a readout offset value indicating a relative position of the transmission section in the captured waveform data of the unit of processing, and transmits the readout offset value to the readout offset acquisition unit via the communication network. The measurement system described in . A waveform data transfer method for receiving a signal under test transmitted from a device under test (2) in a time-sharing manner in which transmission intervals and reception intervals are switched within a frame, and transferring waveform data of the signal under measurement,
A divided frequency span setting step (S1) for setting a plurality of divided frequency spans obtained by dividing the frequency span that is the measurement range;
receiving steps (S3 to S5) of receiving the signal under measurement and generating waveform data (d) of the signal under measurement for each of the divided frequency spans;
a trigger generation step of generating a trigger signal with a frame period;
a waveform data capture step (S6) of capturing waveform data (e) of a predetermined processing unit based on the trigger signal from the generated waveform data of the signal under measurement for each of the divided frequency spans;
Among the plurality of divided frequency spans, in the main divided frequency span in which the frequency component of the data in the transmission section exists, the captured waveform data of the unit of processing is transferred as transfer data, and the waveform data is transferred as transfer data other than the main divided frequency span. a transfer data extraction step (S7) of extracting and transferring, as transfer data, waveform data of the signal under measurement corresponding to the transmission interval from the captured waveform data of the processing unit in the divided frequency span of
waveform data transfer method, including a waveform data transfer method according to claim 8 ;
a transfer data acquisition step of acquiring transfer data transferred by the waveform data transfer method;
a frame synchronization processing step (S8) of detecting a frame timing of the transfer data of the main divided frequency span among the transferred transfer data;
a demodulation step (S18) of demodulating the transferred transfer data signal based on the frame timing detected by the frame synchronization processing step;
a measuring step (S19) of measuring characteristics of the demodulated signal;
including measurement method. A measurement method using a measurement system (100) comprising a receiver (110) and a data processor (120) connected to the receiver via a communication network (130),
In the receiving device,
Implementing the waveform data transfer method according to claim 8 ,
transmitting transfer data generated by performing the waveform data transfer method to the data processing device via the communication network;
In the data processing device,
receiving transfer data transmitted from the receiving device;
detecting the frame timing of the transfer data of the main divided frequency span among the received transfer data;
demodulating the received transfer data signal based on the detected frame timing;
measuring characteristics of the demodulated signal;
method of measurement, including

Images