JP2007019741A - Burst signal analyzing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burst signal analyzing device capable of specifying a burst and grasping a plurality of signal characteristics of the bursts at a glance. <P>SOLUTION: The burst signal analyzing device comprises a signal memory 10 for storing waveform data for each burst at an inputted transmission signal (a), a level measuring means 14 for measuring a signal level at each time of the waveform data of 1 measurement zone stored by the signal memory, a burst waveform display means 19 for generating burst waveforms 16 for 1 measurement zone from the measured signal level of 1 measurement zone and displaying and outputting them on a display 20, a burst specifying means 27 for displaying a position of the burst of a measured object operation specified on the displayed burst waveforms using a first marker 43, a characteristic measuring portion 30 for measuring signal characteristics of the specified bursts, and a signal characteristic display means 19 for displaying each signal characteristic measured by the characteristic measuring portion on a screen of the display 20 the same with the burst waveform. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a burst signal analyzing apparatus that analyzes a communication signal composed of a plurality of bursts each composed of a modulated signal.

  In the mobile communication system, as shown in FIG. 14 (a), signals are exchanged at regular time intervals even during a period in which no call is made between the mobile terminal 1 such as a mobile phone and the base station 2. I'm doing it. This is because it is necessary to notify the base station 2 that the mobile terminal 1 exists in the cell (jurisdiction range) of the base station 2.

That is, as shown in FIG. 14B, when the mobile terminal 1 is powered on, a plurality of preambles 3 having a burst width T ₁ are output at a constant time interval T ₂ , and thereafter the burst width T ₃ A communication signal a followed by the message 4 is output from the mobile terminal 1 as a radio wave. Each of the plurality of preambles 3 and one message 4 constitutes a burst.

  Then, the signal level L of the preamble 3 is sequentially increased, and when the base station 2 receives the preamble 3 of the corresponding mobile terminal 1, a reception confirmation signal is transmitted from the base station 2, and a message 4 is sent to the base station 2. It transmits, and it transfers to the state in which the telephone call with respect to the other mobile terminal via the base station 2 is possible. After shifting to this state, when a telephone number of a call destination is input and a transmission button is pressed, a normal call is started.

The number of preambles 3 included in the communication signal a composed of the plurality of preambles 3 and one message 4 varies depending on the distance between the mobile terminal 1 and the base station 2. Therefore, the signal length T ₄ of the communication signal a is not constant. If the mobile terminal 1 is far away from the base station 2, as shown in FIG. 14 (c), even if the signal level L of the preamble 3 is increased to the limit level Lm, the reception confirmation signal is received from the base station 2. Is not sent. In this case, “out of call area” is displayed on the display, and the output of the communication signal a is resumed after the predetermined time T _{5 has} elapsed.

When the communication system in the mobile communication system adopts, for example, the W-CDMA system, as shown in FIG. 14D, the burst of each preamble 3 is converted into QPSK modulation system using predetermined fixed data. The burst width (signal length) T ₁ is 1167 μs, which corresponds to the number of 4096 chips when converted into I and Q data.

  The burst of the message 4 is a CDMA method for registering the base station 2 with the base station 2 that the mobile terminal 1 is present in the cell (jurisdiction range) of the base station 2 with the base station 2. It is composed of modulated signals.

  When a mobile terminal 1 used in such a mobile communication system is newly developed, or when a failure or the like that the mobile terminal 1 during operation cannot connect to the base station 2 occurs, the mobile terminal 1 Therefore, it is necessary to confirm in detail, if necessary, that the correct communication signal “a” is being output.

Patent Document 1 proposes a spurious measurement device that analyzes a spurious component in a signal including a plurality of slots transmitted and received between a base station and each mobile station in a PHS (Personal Handy phone System).
JP-A-2005-57580

  The present invention has been made in view of such circumstances, and specifies each burst of a communication signal composed of a plurality of preambles and one message, and the frequency, modulation error rate, constellation, phase of the corresponding burst. Multiple signal characteristics including error and signal level can be grasped at a glance, and if necessary, a specific time position of one burst can be specified to display detailed characteristic values, and communication signals can be analyzed in a short time An object of the present invention is to provide a burst signal analyzing apparatus that can efficiently identify the location of an abnormality and the cause of the abnormality.

  In order to solve the above-described problems, the present invention provides a burst signal analyzing apparatus that analyzes a communication signal composed of a plurality of preambles composed of modulated signals and a plurality of bursts that are one message composed of modulated signals. A signal memory for storing waveform data for at least one measurement section including at least a preamble in the communication signal, and level measuring means for measuring a signal level at each time of the waveform data for one measurement section stored in the signal memory; The burst waveform display means for creating a burst waveform for one measurement section from the signal level for one measurement section measured by the level measuring means and displaying it on the display unit, and the operation-designated burst to be measured are displayed. Burst designation means for displaying the position on the burst waveform with the first marker, and the burst designation means A characteristic measurement unit that measures multiple signal characteristics including at least the frequency, modulation error rate, constellation, phase error, and signal level of the burst specified in, and each signal characteristic measured by this characteristic measurement unit on the display Signal characteristic display means for displaying on the same display screen as the burst waveform is provided.

  In the burst signal analyzing apparatus configured as described above, a burst waveform indicating a change in signal level with time at each time for one measurement section including a plurality of preambles and one message in a communication signal is displayed on a display. The When the operator designates a burst to be measured, the corresponding burst on the burst waveform is designated and displayed with a marker. Further, each signal characteristic of the corresponding burst is displayed on the same display screen as the burst waveform.

  Therefore, it is possible to specify an arbitrary burst on the burst waveform of a communication signal composed of a plurality of preamble bursts and one message burst, and to grasp and grasp each signal characteristic of the corresponding burst. Can be an easy-to-use signal analysis device.

  According to another aspect of the invention, in the burst signal analyzing apparatus of the invention described above, the burst designating unit can designate a plurality of bursts simultaneously, and the characteristic measuring unit measures each signal characteristic of the designated plurality of bursts, The characteristic display means displays each signal characteristic of each burst on the display so as to be identifiable for each burst.

  In the burst signal analyzer configured in this way, when any multiple bursts on the burst waveform are specified, the signal characteristics of each burst specified on the display can be identified by color coding, for example, for each burst Is displayed.

  According to another aspect of the present invention, the burst signal level based on the signal level measured by the level measuring unit among the plurality of bursts stored in the signal memory is a threshold value. Demodulating the above bursts to obtain each data value at each chip position during the burst duration, and determining whether each data value demodulated by the demodulating means is correct or not, and calculating the data error rate of each burst An error rate calculation means, and an error rate display means for displaying the data error rate of each burst calculated by the error rate calculation means in a position near the corresponding burst in the burst waveform displayed on the display unit. Yes.

  In the burst signal analyzing apparatus configured as described above, the data error rate of the corresponding burst is displayed in the vicinity of the burst whose signal level is equal to or higher than the threshold among the plurality of bursts on the burst waveform. And the data error rate can be grasped at a glance.

  Further, another invention provides a demodulating means for demodulating a burst designated by the burst designating means to obtain each data value at each chip position in the burst duration period, to the burst signal analyzing apparatus of the invention described above, Error determination means for determining whether each data value demodulated by the demodulation means is correct or not, and each data value demodulated by the demodulation means is displayed on the same display screen as the burst waveform on the display, and the error determination means determines that there is an error. Decoded data display means for displaying the determined data value in an identifiable manner with respect to the data value determined to be normal is added.

  In the burst signal analyzing apparatus configured as described above, when a burst to be measured is specified while the burst waveform is displayed on the display, each data value at each chip position in the burst duration of the corresponding burst is demodulated. Displayed on the display unit. At the same time, the data value determined to be erroneous is displayed so as to be identifiable in red, for example. Therefore, the error data value can be confirmed at a glance.

  Another invention is a burst extraction means for extracting a plurality of preambles and one message in a plurality of bursts stored in a signal memory, and the burst extraction means for the burst signal analyzing apparatus of the invention described above. And a burst for prohibiting burst designation in the burst designation means for the preamble determined to be less than the threshold by the level determination means. A designation prohibition means is added.

  In the burst signal analyzing apparatus configured as described above, burst designation is prohibited when the signal level in the preamble burst is less than the threshold among the plurality of bursts constituting the communication signal. Since it is not necessary to perform signal characteristic measurement for a preamble burst having a low signal level where normal signal characteristics cannot be obtained, test work efficiency is improved.

  Another invention provides the burst signal analyzing apparatus according to the above-described invention with each chip position in the burst duration of the signal characteristic designated by the second marker among the plurality of signal characteristics displayed on the display. A characteristic chronological graph display means for creating a characteristic chronological graph indicated by each unit characteristic and displaying it on a display is added.

  In the burst signal analyzing apparatus configured as described above, when one signal characteristic of a plurality of signal characteristics in the designated burst is designated by the second marker, each chip in the burst duration period of the designated signal characteristic Since a characteristic time graph showing each unit characteristic at the position is displayed on the display device, more detailed signal characteristics can be obtained.

  Another invention provides the burst signal analyzing apparatus according to the above-described invention with detailed characteristics for displaying the value of the unit characteristic of the designated chip position and the chip position on the characteristic temporal graph with a third marker in the burst duration period. Display means are added.

  In the burst signal analyzing apparatus configured as described above, when the chip position is designated, the unit characteristic value of the chip position is displayed, and the chip position on the characteristic temporal graph is displayed by the third marker.

  In the present invention, a burst waveform of a communication signal composed of a plurality of preambles and one message is displayed, and each signal characteristic of a designated burst is measured and displayed on the same screen as the burst waveform.

  Therefore, by specifying the burst to be measured, it is possible to grasp at a glance a plurality of signal characteristics including the frequency, modulation error rate, constellation, phase error, and signal level of the corresponding burst, and if necessary, one burst The specific characteristic position can be specified, the detailed characteristic value can be displayed, the communication signal can be analyzed in a short time, and the location of the abnormality and the cause of the abnormality can be efficiently identified.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a burst signal analyzing apparatus according to an embodiment of the present invention. The burst signal analyzing apparatus of this embodiment includes a plurality of preambles 3 and 1 output from a mobile terminal 1 composed of a mobile phone used in a mobile communication system employing the W-CDMA communication system shown in FIG. The communication signal a composed of the four messages 4 is analyzed.

  The high-frequency communication signal a input from the input terminal 5 is frequency-converted to an intermediate frequency based on the frequency signal from the local oscillator (LOOSC) 7 by the frequency converter 6, and then an unnecessary frequency component is removed by the band-pass filter 8. The digital signal is converted into a digital communication signal a by the A / D converter 9 and written into the signal memory 10.

For example, as shown in FIG. 14C, the signal memory 10 includes a plurality of preambles 3 and one signal even if the number of preambles 3 increases and the signal length T ₄ of the communication signal a extends to the limit value. And a FIFO type memory having a capacity for storing waveform data of each burst for at least one measurement section (for example, 62 ms). Therefore, the digital communication signal a output from the A / D converter 9 is continuously written in the signal memory 10 and simultaneously output from the signal memory 10.

  When the signal start position detecting unit 11 detects the leading edge of the preamble 3 in the digital communication signal a sequentially output from the A / D converter 9, the writing / reading control unit 12 stores the preamble in the signal memory 10. 3, the writing of the communication signal a to the signal memory 10 is stopped at the timing when the data slightly before the rising edge detection 3 is output from the signal memory 10. As a result, at least one communication signal a including a plurality of preambles 3 and one message 4 is stored in the signal memory 10.

  At least one communication signal a for one measurement section stored in the signal memory 10 is read and input to the burst extraction unit 13 and the level measurement unit 14. The level measuring unit 14 measures the signal level at each time (every 1 μs) of the input communication signal a for one measurement section (62 ms). The logarithmic conversion unit 15 logarithmically converts each measured signal level, converts it to dB units, and outputs a burst waveform 16 for one measurement section (62 ms) shown in FIG. In this embodiment, two communication signals a each consisting of a total of six bursts 17 of five preambles 3 and one message 4 are included in one measurement section (62 ms).

  The burst waveform 16 is temporarily stored in the burst waveform memory 18 and displayed on the display 20 via the display editing unit 19. FIG. 6 shows the burst waveform 16 displayed at the top of the display screen of the display 20. The burst waveform 16 is always displayed during the measurement period of the communication signal a by the communication signal measuring apparatus even if the measurement conditions and display conditions designated by the operation unit 27 are changed.

  The burst extraction unit 13 of FIG. 1 specifies each burst 17 from the rising and falling edges of the signal in the input communication signal a for one measurement section (62 ms), extracts each burst 17 and sends it to the burst determination unit 21. Send it out. The burst determination unit 21 classifies each burst 17 into a preamble 3 and a message 4 based on the burst length, and writes them into the preamble memory 22 and the message memory 23, respectively.

  The message 4 read from the message memory 23 is input to the measurement burst designation unit 26. Each preamble 3 read from the preamble memory 22 is input to the measurement burst designation unit 26 via the measurement preamble control unit 25.

  The level determination unit 24 obtains the signal level of each preamble 3 read from the preamble memory 22 from the logarithmic conversion unit 15, determines whether the average signal level is equal to or higher than a threshold value, and measures the determination result to measure preamble control. The data is sent to the unit 26. The measurement preamble control unit 26 prohibits the input of the preamble 3 whose signal level is less than the threshold value to the measurement burst designating unit 26. The measurement burst designation unit 26 selects one burst of the preamble 3 or the message 4 designated from the operation unit 27 and sends it to the I / Q separation unit 28.

  The I / Q separation unit 28 orthogonally demodulates the burst 17 composed of one modulated signal for which the preamble 3 or the message 4 has already been determined, and performs the I for each chip (each time) in the burst duration (burst length). Separate into (in-phase) component and Q (quadrature) component. The burst separated into I and Q data by the I and Q separation unit 28 is input to the demodulation unit 29 and the characteristic measurement unit 30.

  In the characteristic measurement unit 30, a frequency measurement unit 31, an EVM (modulation error) measurement unit 32, a constellation measurement unit 33, a phase error measurement unit 34, an amplitude error measurement unit 35, and an origin offset measurement unit 36 are provided. .

  The frequency measuring unit 31 obtains the burst carrier frequency at each chip position (at each time) of the burst from the period of the I and Q data, and obtains the average carrier frequency of this burst and the error frequency from the specified carrier frequency.

  As shown in FIG. 5A, the constellation measurement unit 33 includes a constellation 37 in which I and Q data corresponding to the burst modulation method are indicated on IQ coordinates at each chip position (each time) of the burst. calculate.

  As shown in FIG. 5B, the EVM (modulation error) measurement unit 32 combines the I and Q data in the calculated (measured) constellation 37 at each chip position (each time) of the burst ( An error (modulation error) between the measurement point) and the synthesis point (logical point) of each I and Q data in the logical constellation is obtained. Further, as shown in FIG. 5C, the average EVM (RMS EVM) of this burst is obtained.

  As shown in FIG. 5B, the phase error measurement unit 34 combines the I and Q data (measurement points) of the constellation 37 calculated (measured) at each chip position (each time) of the burst. And the phase error between the combined points (logical points) of the respective I and Q data in the logical constellation. Further, the average phase error of this burst is calculated.

  FIG. 5D shows the distance between the origin (O) of the IQ coordinate of the calculated constellation 37 and the origin O ′ of the IQ coordinate of the logical constellation. Calculate the origin offset.

  The amplitude error measurement unit 35 obtains the amplitude (transmission power, signal level) from the I and Q data at each chip position (each time) of the burst, and obtains the amplitude error from the reference amplitude.

  The signal characteristics for one burst obtained by the measurement units 31 to 36 of the characteristic measurement unit 30 are written into the one preamble measurement result memory 38, the message measurement result memory 39, and the measurement result memory 40 for each burst.

  In the 1 preamble measurement result memory 38, as shown in FIG. 3, when the burst 17 measured by the characteristic measurement unit 30 is the preamble 3, the frequency measurement unit 31, the EVM (modulation error) measurement unit 32, the constellation measurement Signal characteristic (unit signal characteristic) and burst at each chip position (each time) of burst 0 to 4095 obtained by the unit 33, the phase error measurement unit 34, the amplitude error measurement unit 35, and the origin offset measurement unit 36 The average value of the entire 17 is written.

  In the message measurement result memory 39, similarly to the one preamble measurement result memory 38, the frequency measurement unit 31, the EVM (modulation error) measurement unit 32, the constant when the burst 17 measured by the characteristic measurement unit 30 is the message 4. Signal characteristic (unit signal characteristic) at each chip position (each time) of the burst obtained by the measurement measurement unit 33, phase error measurement unit 34, amplitude error measurement unit 35, and origin offset measurement unit 36, and the entire burst 17 The average value of is written.

  In the measurement result memory 40 for each burst, as shown in FIG. 4, the average value of each signal characteristic is written for each burst 17 of a plurality of preambles 3 and one message 4.

  The demodulator 29 demodulates the modulation signal of the burst 17 separated into the I and Q data by the I and Q separation unit 28 using a demodulation method corresponding to QPSK or CDMA of the burst 17, and each chip position ( The data value at each time) is obtained and written into the data memory 41.

  Also, the correctness of each data value written in the data memory 41 is detected, the data error rate is calculated, and additionally written in the data memory 41.

  The display editing unit 19 reads out the burst waveform 16, each signal characteristic, and data value stored in each memory 18, 38, 39, 40, 41 based on an instruction from the operation unit 27 and marker control unit 42, and displays it. Display on the device 20.

  Hereinafter, the display patterns in each instruction will be described in order with reference to FIGS. As described above, the burst waveform 16 read from the burst waveform memory 18 and displayed on the upper part of the display screen of the display device 20 is displayed even if the measurement conditions or display conditions designated by the operation unit 27 are changed. The communication signal measuring device always displays during the measurement period of the communication signal a.

  FIG. 6 shows a display state when the burst waveform 16 is displayed on the display unit 20 and the burst of the second preamble 3 is designated by the operation unit 27. Each signal characteristic of the burst of the second preamble 3 is measured, and the average value of the entire burst of each signal characteristic 44 is displayed on the same screen. Further, the position of the second preamble 3 on the burst waveform 16 is displayed by the first marker 43 on the operation unit 27.

  Thus, it is possible to easily display the average value of each signal characteristic 44 of the burst designated by the operation unit 27. Further, in the measurement preamble control unit 25, if the signal level in the burst of the preamble 3 is less than the threshold value, the burst designation is prohibited, so that the preamble 3 having a low signal level from which normal signal characteristics cannot be obtained from the beginning. Since it is not necessary to perform signal characteristic measurement for a burst of data, the test work efficiency is improved.

  In FIG. 7, the signal characteristic of the constellation 37 is designated with the burst waveform 16 and the average value of each signal characteristic 44 of the designated burst being displayed on the display 20, and one chip position in the burst. When (time) is designated by the operation unit 27, the corresponding chip position on the constellation 37 is designated by the third marker 45.

  In FIG. 8, the EVM signal characteristic is designated by the second marker 46 in a state in which the average value of the signal characteristic 44 of the burst waveform 16 and the designated second burst is displayed on the display unit 20. When one chip position in the burst is designated by the operation unit 27, a characteristic time graph 47 of EVM indicated by each unit characteristic in each chip position during the burst duration is displayed. Further, when one chip position in the burst is designated by the operation unit 27, the corresponding chip position on the characteristic temporal graph 47 is designated by the third marker 45. Further, a unit characteristic (EVM) value 48 of the corresponding chip position is displayed.

  In FIG. 9, the phase error signal characteristic is designated by the second marker 46 in a state in which the average value of each of the burst waveform 16 and the signal characteristic 44 of the designated second burst is displayed on the display 20. Further, when one chip position in the burst is designated by the operation unit 27, a characteristic time graph 47 of the phase error indicated by each unit characteristic at each chip position in the burst duration is displayed. Further, when one chip position in the burst is designated by the operation unit 27, the corresponding chip position on the characteristic temporal graph 47 is designated by the third marker 45. Further, a unit characteristic (phase error) value 48 of the corresponding chip position is displayed.

  In FIG. 10, in the state where the burst waveform 16 and the average value 44 of each signal characteristic of the designated fourth burst are displayed on the display device 20, the signal characteristic of the transmission power (amplitude) is indicated by the second marker 46. Further, when one time position in the burst is designated by the operation unit 27, a characteristic time graph 47 of transmission power (amplitude) indicated by each unit characteristic at each time position in the burst duration is displayed. Further, when one time position in the burst is designated by the operation unit 27, the corresponding time position on the characteristic temporal graph 47 is designated by the third marker 45. Further, a unit characteristic (transmission power) value 48 of the corresponding time position is displayed.

  As described above, when one signal characteristic of a plurality of signal characteristics in the designated burst 17 is designated by the second marker 46, each unit characteristic at each chip position in the burst duration of the designated signal characteristic is indicated. Since the characteristic time graph 47 is displayed on the display device 20, more detailed signal characteristics can be obtained. Furthermore, when the chip position is designated, the unit characteristic value 48 of the chip position is displayed, and the chip position on the characteristic time graph 47 is displayed by the third marker 45, so that more detailed signal characteristics can be obtained.

  In FIG. 11, when a demodulated data display instruction is input from the operation unit 27 in a state where the burst waveform 16 and the second burst are specified on the display device 20, the burst specified by the demodulator 29 is demodulated. Then, each data value 49 at each chip position (each time) of the demodulated burst is displayed on the display 20. In this case, the data value 50 determined to be erroneous is displayed so as to be identifiable in red, for example.

  In this way, each data value 49 at each chip position in the burst duration of the burst is demodulated and displayed on the display 20. At the same time, the data value 50 determined to be erroneous is displayed so as to be identifiable in red, for example. Therefore, the error data value 50 can be checked at a glance.

  In FIG. 12, when a display instruction of a data error rate is input in a state where the average value of each signal characteristic 44 of the burst waveform 16 and the designated fourth burst is displayed on the display device 20, each demodulator 29 Demodulate the burst. Then, the data error rate 51 of each demodulated burst is calculated and displayed in the vicinity of the corresponding burst 17 in the burst waveform 16.

  In addition to the data error rate, any signal characteristic can be specified. In this case, the characteristic measuring unit 30 measures each signal characteristic of each burst 17 in order, writes the average value in the burst-specific measurement result memory 40 in order, and displays it on the display 20.

  In FIG. 13, the display state when the burst waveform 16 is displayed on the display unit 20 and a plurality of bursts of the second preamble 3 burst and the fourth preamble 3 burst are designated by the operation unit 27. Indicates.

  Each signal characteristic of each burst of the second and fourth preambles 3 is measured in order, and each average value is sequentially written in the measurement result memory 40 for each burst, and then the signal characteristic 44 for each burst is displayed on the display 20. Is displayed on the same screen. Further, the positions of the second and fourth preambles 3 on the burst waveform 16 are displayed by the first marker 43 on the operation unit 27. In this case, for example, each first marker 43 and each signal characteristic 44 are displayed in different colors for each burst.

1 is a block diagram showing a schematic configuration of a burst signal analyzing apparatus according to an embodiment of the present invention. The figure which shows the burst waveform produced with the burst signal analyzer of the embodiment The figure which shows the memory content of 1 preamble measurement result memory formed in the burst signal analyzer of the embodiment The figure which shows the memory content of the measurement result memory classified by burst formed in the burst signal analysis device of the same embodiment The figure which shows each signal characteristic in the burst signal analyzer of the embodiment The figure which shows the analysis result of the communication signal displayed on the indicator of the burst signal analyzer of the embodiment The figure which shows the analysis result of the communication signal similarly displayed on the indicator of the burst signal analyzer of the same embodiment The figure which shows the analysis result of the communication signal similarly displayed on the indicator of the burst signal analyzer of the same embodiment The figure which shows the analysis result of the communication signal similarly displayed on the indicator of the burst signal analyzer of the same embodiment The figure which shows the analysis result of the communication signal similarly displayed on the indicator of the burst signal analyzer of the same embodiment The figure which shows the analysis result of the communication signal similarly displayed on the indicator of the burst signal analyzer of the same embodiment The figure which shows the analysis result of the communication signal similarly displayed on the indicator of the burst signal analyzer of the same embodiment The figure which shows the analysis result of the communication signal similarly displayed on the indicator of the burst signal analyzer of the same embodiment Diagram showing configuration of communication signal

Explanation of symbols

  a ... communication signal 1 ... mobile terminal 2 ... base station 3 ... preamble 4 ... message 9 ... A / D converter 10 ... signal memory 13 ... burst extraction unit 14 ... level measurement unit 16 ... Burst waveform, 17 ... Burst, 18 ... Burst waveform memory, 19 ... Display editing section, 20 ... Display, 21 ... Burst determination section, 22 ... Preamble memory, 23 ... Message memory, 25 ... Measurement preamble control section, 26 ... Measurement Burst designation unit, 27 ... operation unit, 28 ... I and Q separation unit, 29 ... demodulation unit, 30 ... characteristic measurement unit, 31 ... frequency measurement unit, 32 ... EVM (modulation error) measurement unit, 33 ... constellation measurement unit 34 ... Phase error measurement unit, 35 ... Amplitude error measurement unit, 36 ... Origin offset measurement unit, 37 ... Constellation, 38 ... 1 preamble measurement result memory, 39 ... Memory Sage measurement result memory, 40 ... Measurement result memory by burst, 41 ... Data memory, 42 ... Marker control unit, 43 ... First marker, 44 ... Signal characteristics, 45 ... Third marker, 46 ... Second marker, 47: Characteristic time graph, 48: Unit characteristic value, 49: Data value, 50: Error data value, 51: Data error rate

Claims (7)

In a burst signal analyzing apparatus for analyzing a communication signal (a) composed of a plurality of preambles (3) composed of modulated signals and a plurality of bursts which are one message (4) composed of modulated signals,
A signal memory (10) for storing waveform data for at least one measurement section including at least a preamble in the input communication signal;
Level measurement means (14) for measuring a signal level at each time of waveform data for one measurement section stored in the signal memory;
Burst waveform display means (15, 18, 19) for generating a burst waveform (16) for one measurement section from the signal level for one measurement section measured by the level measuring means and displaying and outputting it on the display (20); ,
Burst designation means (26, 27) for displaying a position on the displayed burst waveform of the burst to be measured which is designated for operation with a first marker (43);
A characteristic measuring unit (30) for measuring a plurality of signal characteristics including at least the frequency, modulation error rate, constellation, phase error, and signal level of the burst specified by the burst specifying means;
A burst signal analyzing apparatus comprising signal characteristic display means (19) for displaying each signal characteristic (44) measured by the characteristic measuring section on the same display screen as the burst waveform on the display. The burst designating unit can designate a plurality of bursts simultaneously,
The characteristic measurement unit measures each signal characteristic of a plurality of designated bursts,
2. The burst signal analyzing apparatus according to claim 1, wherein said signal characteristic display means displays each signal characteristic of each burst on the display so as to be identifiable for each burst. Of the plurality of bursts stored in the signal memory, a burst whose signal level based on the signal level measured by the level measuring means is demodulated is equal to or higher than a threshold value, Demodulation means (29) for obtaining data values;
An error rate calculating unit that determines whether each data value demodulated by the demodulating unit is correct or not, and calculates a data error rate of each burst;
Error rate display means for displaying the data error rate (51) of each burst calculated by the error rate calculation means in an overlapping manner in the vicinity of the corresponding burst in the burst waveform displayed on the display. The burst signal analyzing apparatus according to claim 1. Demodulating means (29) for demodulating the burst designated by the burst designating means to obtain each data value at each chip position in the burst duration;
Error determination means for determining the correctness of each data value demodulated by the demodulation means;
Each data value (49) demodulated by the demodulating means is displayed on the display device on the same display screen as the burst waveform, and the data value determined to be error by the error determining means is a data value determined to be normal. 2. A burst signal analyzing apparatus according to claim 1, further comprising decoded data display means for displaying the data in an identifiable manner. Burst extracting means (21) for extracting a plurality of preambles and one message in a plurality of bursts stored in the signal memory;
Level determination means (24) for determining whether or not the signal level of each preamble extracted by the burst extraction means is equal to or higher than a threshold value;
2. A burst signal analyzing apparatus according to claim 1, further comprising burst designation prohibiting means (25) for prohibiting burst designation in said burst designation means for a preamble determined to be less than a threshold by said level judgment means. . A characteristic temporal graph (47) showing each unit characteristic at each chip position in the burst duration of the signal characteristic designated by the second marker (46) among the plurality of signal characteristics displayed on the display is created. 2. A burst signal analyzing apparatus according to claim 1, further comprising a characteristic temporal graph display means for displaying on said display. The detailed characteristic display means for displaying the value of the unit characteristic of the specified chip position in the burst duration and the chip position on the characteristic time-lapse graph with a third marker (45). Burst signal analyzer.

Images