JP3949128B2 - CDMA signal analysis apparatus and analysis method - Google Patents

Description

  The present invention relates to a CDMA signal analyzing apparatus and a CDMA signal analyzing method for analyzing a signal in each channel of each spreading factor of a CDMA signal that is an input signal under measurement.

  As one of the wireless communication systems in the third generation mobile communication system, W-CDMA (Wideband Code Division Multiple Access) has been proposed. When this communication method is used, a large number of data transmitted and received according to the W-CDMA communication standard (3GPP) are multiplexed and incorporated in a signal transmitted and received between a base station and a mobile station (mobile phone). It is.

  FIG. 10 shows a multiplexing method of transmission data D0 to Dn on the transmission side in W-CDMA. Each of the transmission data D0 to Dn is code-spread by different spreading codes (orthogonal variable spreading codes) w0 to wn in the code spreading unit 1 and added by the adder 2, and then a scramble code is given by the multiplier 3. The signal is multiplied, converted into a high-frequency signal by a high-frequency circuit as 3.84 MHz chip data, and output as a radio wave.

  Next, the configuration of a spreading code for spreading the transmission data D0 to Dn in the code spreading unit 1 will be described with reference to FIG. The spread code of this CDMA system is configured in a tree structure as shown in the figure, and spread code (Spreading Factor) according to the spread code length 4, 8, 16, 32, 64, 128, 256, 512 of the spread code 4, respectively. ) 5 (SF4, SF8, SF16, SF32, SF64, SF128, SF256, SF512) is defined. In FIG. 11, the diffusion factors 5 of SF32 to SF512 are omitted.

  Each spreading factor 5 is assigned a spreading code 4 corresponding to the spreading code length of the spreading code 4 to which it belongs. For example, a total of 8 spreading codes 4 each having a code length of 8 for channels CH0 to CH7 are assigned to spreading factor SF8 according to a certain rule.

  In W-CDMA, the transmission rate of data output from the transmission side is fixed (3.84 Mcps, and the length (time) of one frame is also fixed (10 ms). Therefore, the number of chip data included in one frame is also constant ( Therefore, on the transmitting side, the code length (spreading factor 5) is adopted according to the number of data to be transmitted and the type of data (information) (alphanumeric data, sound, image etc). ) Is selected and set.

  In this case, all the spreading codes 4 belonging to the lower spreading factor 5 branched (branched) from the selected spreading code 4 and each spreading code 4 in the higher sequence of the selected spreading code 4 are prohibited from being selected. Become. When the spreading code 4 of the lower spreading factor 5 branched from itself or the spreading code 4 of the higher order sequence of the self is selected at the same time, which spreading code 4 is despread. This is because it is not possible to distinguish whether the transmission data is spread by the.

  Therefore, the maximum number of spreading codes 4 that can be adopted by the code spreading unit 1 in the spreading code group configured in this tree structure is 512.

  Each transmission data D0 to Dn on the transmission side in W-CDMA is modulated by a QPSK (Quadrature phase shift keying) modulation method. Further, in recent years, a standard of HSDPA (High Speed Downlink Packet Access) of the 3.5th generation mobile communication system (3.5G) that has increased the packet communication speed based on the W-CDMA has been studied. In this HSDPA, each transmission data D0 to Dn can adopt a modulation method of 16QAM (Quadrature amplitude modulation) in addition to QPSK.

  Therefore, it is necessary to test that the radio wave signal transmitted from the base station to each mobile station (mobile phone) in the mobile communication system adopting such a W-CDMA wireless communication system satisfies the above-mentioned standard. is there.

Patent Document 1 discloses a technique for determining the code domain power of each channel in a CDMA signal and identifying the channel to which each transmission data is allocated (adopted) on the base station side.
JP 2000-36802 A

  Therefore, in the third generation mobile communication system adopting the W-CDMA standard and the 3.5th generation mobile communication system adopting the HSDPA standard, radio waves transmitted from the base station to each mobile station (mobile phone) It is desired to develop a CDMA signal analysis apparatus that can easily verify that a signal satisfies the above-mentioned standard.

  In addition, the characteristic value of each channel of the CDMA signal is considered to vary greatly depending on the amplitude error and frequency error of the entire CDMA signal, but the degree of influence of the amplitude error and frequency error on the characteristics of each channel is grasped. It is also very important for quality control of CDMA signals.

  The present invention has been made in view of such circumstances, and it is possible to easily perform analysis of signals in each channel in a specified time domain in a time-dependent characteristic within a predetermined period in an input signal to be measured. It is an object of the present invention to provide a CDMA signal analyzing apparatus and a CDMA signal analyzing method capable of easily selecting and viewing a signal analysis result of a channel on a display screen and greatly improving operability.

  The present invention is a CDMA signal analyzing apparatus that displays a constellation in each channel of each spreading factor of a CDMA signal that is an input signal under measurement.

  The CDMA signal analyzing apparatus includes a time-dependent characteristic relating to an amplitude or frequency within a predetermined time of the signal under measurement, a time marker that specifies a unit time region in the time-dependent characteristic, and each of the time markers specified by the time marker and corresponding to the unit time region. A power characteristic indicating the code domain power of the channel, a channel marker designating the channel in the power characteristic, and a constellation of the channel designated by the channel marker are displayed.

  Further, in the CDMA signal analysis method of the present invention, the step of displaying a time-dependent characteristic related to the amplitude or frequency of the signal under measurement within a predetermined time, the step of specifying a unit time region in the displayed time-dependent characteristic, and A step of displaying the code domain power of each channel corresponding to the unit time domain as a power characteristic; a step of designating a channel in the power characteristic; and a step of analyzing and displaying the constellation of the designated channel. .

  Furthermore, the present invention is applied to a CDMA signal analyzing apparatus that analyzes signals in each channel of each spreading factor of a CDMA signal that is an input signal under measurement.

  In order to solve the above-described problem, the CDMA signal analyzing apparatus of the present invention obtains a time-dependent characteristic relating to an amplitude or frequency within a predetermined period of the input signal under measurement and graphically displays it on a display. And an input processing unit that creates chip data with frame synchronization from the input signal under measurement, and chip data that is output from the input processing unit corresponding to the unit time region specified for operation in the time-dependent characteristics displayed graphically Is despread with a spreading code corresponding to the spreading factor for each channel, and the symbol data extraction unit that sequentially extracts the symbol data of each channel, and the symbol data of each channel that is sequentially extracted by this symbol data extraction unit Based on at least each channel's code domain power, modulation scheme, const A channel analysis unit that analyzes the channel configuration, an analysis result memory that stores the analysis result including the code domain power, modulation method, and constellation of each channel analyzed by the channel analysis unit, and each of the analysis results stored in the analysis result memory Power characteristic display means that graphically displays the code domain power of the channel as a power characteristic on the display, and the constellation of the channel specified for operation in the power characteristic displayed on the display is read from the analysis result memory and displayed on the display Constellation display means for displaying.

  In the CDMA signal analyzing apparatus configured as described above, a temporal characteristic regarding the amplitude or frequency within a predetermined period of the input signal under measurement is obtained and displayed graphically on the display.

  When the operator (measurer) designates the unit time region to be measured for the displayed time-dependent characteristic, the chip data output from the input processing unit corresponding to the designated unit time region is spread for each channel. Symbol data of each channel is obtained by despreading with a spreading code corresponding to the factor. Based on this symbol data, it is possible to analyze the code domain power, the modulation method, the constellation, etc. for the signal of each channel.

  The analysis result including the code domain power, modulation scheme, and constellation of each channel analyzed by the channel analysis unit is written in the analysis result memory. The code domain power of each channel written in the analysis result memory is displayed graphically as power characteristics on the display screen of the display. For example, when the operator designates an arbitrary channel of the displayed power characteristic, the constellation of the designated channel is displayed graphically on the display.

  Therefore, the operator of the CDMA signal analyzing apparatus can easily analyze the signal in each channel in the specified time domain in the time-lapse characteristic within the predetermined period in the input signal under measurement, and the signal analysis result of each channel Can be easily selected and viewed on the display screen. That is, the analysis of the CDMA signal can be performed by specifying both the time axis and the channel.

  Further, another invention employs an amplitude error characteristic or a frequency error characteristic as a time characteristic in the CDMA signal analyzing apparatus of the above-described invention, and the time characteristic measuring means is subjected to processing from chip data output from the input processing unit. The time-dependent characteristics of the measurement signal are obtained.

  Further, according to another invention, in the CDMA signal analyzing apparatus according to the above-described invention, the temporal characteristics, the power characteristics, and the constellation are simultaneously displayed in different areas on the display. Therefore, the operator can simultaneously confirm three typical characteristics of the CDMA signal on the display.

  Furthermore, another invention is the CDMA signal analyzing apparatus according to the invention described above, wherein the channel analyzing unit includes the modulation accuracy, phase error, and offset amount of each channel in addition to the code domain power, the modulation method, and the constellation of each channel. Is analyzed. In addition to the code domain power, modulation scheme, and constellation of each channel, the analysis result memory also stores the modulation accuracy, phase error, and offset amount of each channel as analysis results. Then, characteristic value display means for reading each characteristic value including the modulation method, modulation accuracy, phase error, and offset amount of the channel specified for operation in the power characteristic displayed on the display unit from the analysis result memory and displaying it on the display unit I have.

  In the CDMA signal analyzing apparatus configured as described above, the modulation accuracy, phase error, and offset amount of each channel are also analyzed and automatically displayed on the display.

  In the present invention, the time-dependent characteristics within a predetermined period of the input signal under measurement are measured and displayed, and the signals in each channel in the time domain designated by the time-dependent characteristics are analyzed. In addition, it is possible to designate a channel on which the signal analysis result is to be displayed.

  Therefore, the analysis of the CDMA signal can be performed by specifying both the time axis and the channel, and the operability can be greatly improved.

  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 CDMA signal analyzing apparatus to which a CDMA signal analyzing method according to an embodiment of the present invention is applied.

  In the CDMA signal analyzing apparatus of this embodiment, a signal under measurement a that employs an HSDPA communication method output from a base station is input. As shown in FIG. 10, the signal under measurement a adopting this HSDPA communication method, for example, transmits each transmission data D0 to Dn modulated by the QPSK or 16QAM modulation method in the code spreading unit 1 in FIG. It is a signal that is code-spread by each spreading code 4 having the indicated standard, added by the adder 2, spread again by the scramble code, frequency-converted to the carrier frequency, and output from the base station.

  A signal under measurement a input to the CDMA signal analyzer is frequency converted to an intermediate frequency based on a frequency signal from a local oscillator (LOOSC) 8 by a frequency converter 7 in the input processor 6, and then A / A / D conversion is performed by the D conversion unit 9. The A / D converted digital measured signal a is quadrature demodulated into an I (in-phase) component and a Q (quadrature) component by the I and Q separation unit 10 and input to the detection unit 11. The detection unit 11 detects the I component and the Q component to the data I and Q in units of chips using the clock extracted by the clock extraction unit 2 and sends it to the next frequency correction unit 13.

  The frequency correction unit 13 uses the carrier extracted by the carrier extraction unit 14 to correct the frequency error at the time of conversion to the intermediate frequency. The data I and Q in units of chips whose frequency error is corrected are de-scrambled by multiplying the descramble code by the next scramble synchronization unit 15, and a new chip whose frame synchronization is obtained from this input processing unit 6. Data I and Q are sequentially written into the data memory 16.

The data memory 16, a predetermined time period T _A portion of the chip data I in the measurement signal a, Q is stored. Amplitude error calculating unit 17 calculates the amplitude error characteristics shown in FIG. 2 (a) as a temporal characteristic predetermined time period T _A portion of the chip data I stored in the data memory 16, the Q in the measurement signal a . Frequency error calculating unit 18 uses the carrier extracted by the carrier extracting unit 14, the predetermined period T _A portion of the chip data I stored in the data memory 16, time in the measurement signal a is converted into Q A frequency error characteristic shown in FIG. 2B before frequency correction as a characteristic is calculated.

The calculated amplitude error characteristic and frequency error characteristic are displayed graphically as a time-dependent characteristic 21 on the display 20 shown in FIG. The graphic displayed aging characteristics 21 for a predetermined period T _A content on the display device 20, the time marker 22 having a unit time width (area) T _B is displayed. The time marker 22 can be arbitrarily moved in the time axis direction by the operator using the operation unit 23.

The time specified by the marker 22 unit time width (area) T _B are input to the analysis section selecting unit 24. Analyzing section selecting unit 24, the predetermined time period T _A portion of the chip data I stored in the data memory 16, among the Q, designated by the time marker 22 unit time width (area) T _B worth of chip data I , Q are selected in units of frames and sent to the symbol data extraction unit 25.

Symbol data extracting section 25, retrieves a unit time width (area) T _B worth of chip data I, the Q in order from the head position of the frame, despreading with a spreading code 4 input from the spreading code setting unit 26 Thus, new symbol data I and Q of the channel (CH / SF) of the spreading factor 5 corresponding to the spreading code 4 are extracted and sent to the code domain power calculation unit 27 and the modulation scheme determination unit 28, respectively.

Code Domain Power calculator 27, the input unit time width (area) T _B component of the symbol data I, calculates the power (code domain power) P of the Q spreading code setting unit 26, the modulation type determination unit 28. Each time the code domain power P is newly output from the code domain power calculation unit 27, the spreading code setting unit 26 performs the spreading code of each channel (CH / SF) of each spreading factor 5 defined in FIG. 4 are sequentially sent to the symbol data extraction unit 25.

  The modulation scheme determination unit 28 determines whether or not there is a signal in the current channel (CH / SF) and whether the modulation scheme of the signal when there is a signal is QPSK or 16QAM. Specifically, the current channel (CH / SF) has a signal, and the variance values of the symbol data I and Q of the current channel (CH / SF) and the variance values of the symbol data I and Q of the branch destination channel QPSK or 16QAM modulation scheme of the signal in the current channel (CH / SF) is determined.

  The modulation scheme determination unit 28 writes the presence / absence of a signal in the current channel (CH / SF) and the modulation scheme of the signal when there is a signal into the analysis result memory 29. The modulation scheme determination unit 28 sends the modulation scheme of the signal in the current channel (CH / SF) to the constellation calculation unit 30. The constellation calculation unit 30 calculates a constellation 31 in which the symbol data I and Q shown in FIG. The constellation calculation unit 30 writes the calculated constellation 31 to the analysis result memory 29 and sends it to the modulation accuracy calculation unit 32, offset amount calculation unit 33, and phase error calculation unit 34.

  As shown in FIG. 3B, the modulation accuracy calculation unit 32 indicates the modulation accuracy indicating the degree of variation of the combined points (measurement points) of the symbol data I and Q in each quadrant of the measured (calculated) constellation 31. (EVM) is calculated and written into the analysis result memory 29.

  As shown in FIG. 3C, the offset amount calculation unit 33 is between the origin (O) of the IQ coordinate of the calculated (measured) constellation 31 and the origin O ′ of the IQ coordinate of the logical constellation. An offset amount indicating the distance is calculated and written into the analysis result memory 29.

  As shown in FIG. 3C, the phase error calculation unit 34 combines the symbol data I and Q (measurement points) in the calculated (measured) constellation 31 and each symbol in the logical constellation. A phase error between the combined points (logical points) of the data I and Q is calculated and written into the analysis result memory 29.

  Therefore, in the analysis result memory 29, as shown in FIG. 4, for each channel (CH) of each of the spreading factors (SF) 5 of SF4 to SF512, the presence / absence of a signal, QPSK or 16QAM when there is a signal, Modulation method, code domain power P (signal power or noise power), symbol data I and Q values when there is a modulation method, constellation of modulation method when there is a modulation method, modulation accuracy, offset amount, phase Errors and the like are stored.

  The display editing unit 19 reads the code domain power P of each channel from the analysis result memory 29 and graphically displays it as a power characteristic 35 at the bottom of the display screen of the display 20 as shown in FIG.

  Details of the power characteristic 35 are shown in FIG. As shown in the figure, in this power characteristic 35, the horizontal axis indicates the channel where the code domain power P is measured, and the vertical axis indicates the level of the measured code domain power P of the channel. A wider channel indicates a channel (CH) belonging to a higher spreading factor (SF) in the spreading factor (SF) configured in a tree shape shown in FIG. In this example, the channel (1/4) of CH1 (denoted as 1/4) of SF4 is the widest. On the contrary, the channel (0/512) of CH0 (denoted as 0/512) of SF512 is the narrowest. Further, since the level of the code domain power P of the channel (0/512) is smaller than the power threshold value, this channel (0/512) has no signal. Further, since the level of the code domain power P of the channel (1/4) is larger than the power threshold, the channel (1/4) has a signal.

  In this example, the number of used channels in the presence of signal is 44.

  As shown in FIG. 6, a channel marker 36 for selecting a channel CH / SF on the display screen is displayed on the power characteristic 35 displayed on the display 20. The position of the channel marker 36 can be moved to an arbitrary channel position by the operator operating the operation unit 23 such as a keyboard.

  The channel selection unit 35 has the presence / absence of the signal of the channel CH / SF designated by the channel marker 36, the modulation method of QPSK or 16QAM when there is a signal, the code domain power P (signal power or noise power), and the modulation method. Each value of the symbol data I and Q in a certain case, the constellation of the modulation method in the case where there is a modulation method, the modulation accuracy, the offset amount, the phase error and the like are read out, and as shown in FIG. Display output.

  As a result, the display unit 20 includes the above-described temporal characteristics 21, the constellation 31 of the designated channel CH / SF, the power characteristic 35, the channel CH / SF of the designated channel CH / SF, the presence / absence of a signal, the modulation method, the code Characteristic values 38 such as domain power, symbol data I and Q values, modulation accuracy, offset amount, and phase error are simultaneously displayed.

  FIG. 6 shows a state in which the channel (6/16) is designated. This channel (6/16) has a signal and the modulation method is QPSK. FIG. 7 shows a state in which the channel (5/16) is designated, and this channel (5/16) has a signal and the modulation method is 16QAM. Further, FIG. 8 shows a state in which the channel (0/512) is designated. This channel (0/512) has no signal and is not used for communication. Therefore, the modulation method and the modulation analysis result (constellation) 31 are not displayed, and the value of the code domain power P indicates the value of the noise power.

  The overall operation of the CDMA signal analyzing apparatus having such a configuration will be described with reference to the flowchart of FIG.

Measured signal a is input to the data memory 16, a predetermined time period T _A portion of the chip data I in the measurement signal a, when Q is written, by the amplitude error calculating unit 17 calculates the amplitude error characteristics Then, it is displayed and output as a time-dependent characteristic 21 on the display 20 (step S1). When a frequency switching instruction is input from the operation unit 23 (S2), the frequency error calculation unit 18 calculates a frequency error characteristic and displays it as a time-dependent characteristic 21 on the display 20 (S3).

Unit time width on aging characteristics 21 at the time the marker 22 when (region) T _B is designated (S4), chip data I of the measured signal a of the specified unit time width (area) T _B min, Q It was used to perform the analysis of each channel in the given unit time width (area) T _B (measurement area) and writes the analysis result of each channel to the analysis result memory 29 (S5). Then, the code domain power of each channel is displayed and output on the display 20 as the power characteristic 35 (S6).

  When one channel CH / SF is designated by the channel marker 36 on the power characteristic 35, the constellation 31 and each characteristic value 38 of the designated channel CH / SF are displayed on the display 20 (S8). Then, it waits for the next channel CH / SF to be designated by the channel marker 36 (S7).

At S7, without being designated next channel CH / SF channel marker 36, at S4, the next unit time width (area) T _B is designated on aging characteristics 21 at the time the marker 22, this performing an analysis of each channel in the specified unit time width (area) T _B.

  In S9, when the display end operation is performed by the operation unit 23, the analysis operation for the signal under measurement a input this time is ended.

In such CDMA signal analysis apparatus constructed as above, the indicator over time characteristic 21 is obtained about the amplitude error characteristics or frequency error characteristics of a given time period within T _A of the measured signal a input to the CDMA signal analyzer 21 is displayed graphically. Operator (measuring person), specifying the unit time T _B regions to be measured, for example, poor characteristics time or the like in aging characteristics 21 The displayed time marker 22, the unit designated in the measurement signal a time T Analysis of each channel in the _B region is automatically executed, and the analysis result is written into the analysis result memory 29. At the same time, the code domain power of each channel is displayed as a power characteristic 35.

  When the operator designates an arbitrary channel of the displayed power characteristic 35 with the channel marker 36, the constellation 31 and each characteristic value 38 of the designated channel are displayed on the display 20.

Therefore, the operator of the CDMA signal analyzer can analyze is easily implemented in signal in each channel for a specified time domain T _B in aging characteristics 21 within a predetermined time period T _A in the measurement signal a is input, and The signal analysis results for each channel can be easily selected and viewed on the display screen. That is, the analysis of the CDMA signal can be performed by specifying both the time axis and the channel.

1 is a block diagram showing a schematic configuration of a CDMA signal analyzing apparatus according to an embodiment of the present invention. The figure which shows the time-dependent characteristic measured with the CDMA signal analyzer of the embodiment The figure which shows the constellation and characteristic value which were measured with the CDMA signal analyzer of the embodiment The figure which shows the memory content of the analysis result memory provided in the CDMA signal analyzer of the embodiment The figure which shows the power characteristic analyzed with the CDMA signal analyzer of the embodiment The figure which shows the power characteristic, constellation, time-dependent characteristic, and characteristic value which were displayed on the indicator of the CDMA signal analyzer of the embodiment The figure which similarly shows the power characteristic, constellation, time-dependent characteristic, and characteristic value which were displayed on the indicator of the CDMA signal analyzer of the same embodiment The figure which similarly shows the power characteristic, constellation, time-dependent characteristic, and characteristic value which were displayed on the indicator of the CDMA signal analyzer of the same embodiment A flowchart showing the overall operation of the CDMA signal analyzing apparatus of the embodiment The figure which shows the multiplexing method of each transmission data of the transmission side in general W-CDMA Diagram showing the relationship between the spreading factor set in the tree structure and the spreading code in each channel

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Code spreading part, 4 ... Spreading code, 5 ... Spreading factor, 6 ... Input processing part, 7 ... Frequency converting part, 9 ... A / D converting part, 14 ... Carrier extracting part, 15 ... Scramble synchronizing part, 16 ... Data memory 17 ... Amplitude error calculator 18 ... Frequency error calculator 19 ... Display editing unit 20 ... Display device 21 ... Time characteristics 22 ... Time marker 23 ... Operation unit 24 ... Analysis section selection unit 25 ... Symbol data extraction unit, 26 ... Spread code setting unit, 27 ... Code domain power calculation unit, 28 ... Modulation method determination unit, 29 ... Analysis result memory, 30 ... Constellation calculation unit, 31 ... Constellation, 32 ... Modulation error calculator 33 ... offset amount calculator 34 ... phase error calculator 35 ... power characteristic 36 ... channel marker 37 ... channel selector 38 ... characteristic value

Claims (6)

In a CDMA signal analyzing apparatus for displaying a constellation in each channel of each spreading factor of a CDMA signal that is an input signal under measurement,
A time characteristic (21) related to amplitude or frequency within a predetermined time of the signal under measurement, a time marker (22) designating a unit time region in the time characteristic, and the unit corresponding to the unit time region specified by the time marker Means for displaying a power characteristic (35) indicating the code domain power of each channel, a channel marker (36) designating a channel in the power characteristic, and a constellation (31) of the channel designated by the channel marker A CDMA signal analyzing apparatus comprising: In a CDMA signal analysis method for analyzing a constellation in each channel of each spreading factor of a CDMA signal that is an input signal under measurement,
A step (S1, S3) of displaying a time-dependent characteristic (21) relating to an amplitude or frequency within a predetermined time of the signal under measurement;
Designating a unit time region in the displayed temporal characteristics (S4);
Displaying the code domain power of each channel corresponding to the specified unit time domain as a power characteristic (35) (S6);
Designating a channel in the power characteristic (S7);
A CDMA signal analyzing method comprising: analyzing and displaying the constellation of the designated channel (S8). In a CDMA signal analyzing apparatus for analyzing a signal in each channel of each spreading factor of a CDMA signal that is an input signal under measurement,
A time-dependent characteristic measuring means (17, 18, 19) for obtaining a time-dependent characteristic related to an amplitude or frequency within a predetermined period of the input signal under measurement and displaying it graphically on a display;
An input processing unit (6) for creating chip data with frame synchronization from the input signal under measurement;
By despreading the chip data output from the input processing unit corresponding to the unit time region specified for operation in the time characteristic displayed in the graphic, with a spreading code corresponding to a spreading factor for each channel, A symbol data extraction unit (25) for sequentially extracting symbol data;
Channel analysis units (27, 28, 30, 32, 33, which analyze at least the code domain power, modulation scheme, and constellation of each channel based on the symbol data of each channel sequentially extracted by this symbol data extraction unit. 34)
An analysis result memory (29) for storing an analysis result including a code domain power, a modulation method, and a constellation of each channel analyzed by the channel analysis unit;
Power characteristic display means (19) for graphically displaying the code domain power of each channel stored in the analysis result memory as a power characteristic (35) on the display;
Constellation display means (19) for reading the constellation (31) of the channel designated for operation in the power characteristics displayed on the display unit from the analysis result memory and displaying it graphically on the display unit. A CDMA signal analyzer.   The time-dependent characteristic is a time-dependent characteristic of an amplitude error characteristic or a frequency error characteristic, and the time-dependent characteristic measuring unit obtains the time-dependent characteristic of the signal under measurement from chip data output from the input processing unit. 3. The CDMA signal analyzing apparatus according to 3.   5. The CDMA signal analyzing apparatus according to claim 3, wherein the time-dependent characteristic, the power characteristic, and the constellation are simultaneously displayed in different areas of the display. The channel analysis unit analyzes the modulation accuracy, phase error, and offset amount of each channel in addition to the code domain power, modulation scheme, and constellation of each channel,
In addition to the code domain power, modulation scheme, and constellation of each channel, the analysis result memory stores the modulation accuracy, phase error, and offset amount of each channel as analysis results,
Characteristic value display means for reading each characteristic value including the modulation method, modulation accuracy, phase error, and offset amount of the channel specified for operation in the power characteristic displayed on the display unit from the analysis result memory and displaying it on the display unit The CDMA signal analyzing apparatus according to claim 3, further comprising:

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