JP2006060478A - Sch analyzer for w-cdma signal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To analyze the data of SCH included in the respective slots of W-CDMA signals. <P>SOLUTION: SCH signals having a signal level and data are obtained from measurement signals 20 for one slot of signals (a) to be measured being the W-CDMA signals, a P-SCH signal level L<SB>P</SB>and an S-SCH signal level L<SB>S</SB>are obtained from the SCH signals, and ideal P-SCH signals and ideal S-SCH signals are prepared further. By subtracting the ideal P-SCH signals and the ideal S-SCH signals from the SCH signals, S-SCH signals and P-SCH signals having the target signal level and data are independently obtained. Thus, the data (bit data) of the S-SCH signals and the data (bit data) of the P-SCH signals included in the respective slots 9 are obtained and displayed and outputted at a display device 45. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a W-CDMA signal SCH analyzing apparatus that analyzes SCH included in each slot of a W-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 (portable terminal). It is.

  FIG. 9 shows a multiplexing method of transmission data D0 to Dn of each channel on the transmission side in W-CDMA. For example, transmission data D0 to Dn of each channel phase-modulated by QPSK (Quadrature phase shift keying) or 16QAM (Quadrature amplitude modulation) are differently spread codes (orthogonal variable spreading codes) in the code spreading unit 1. After code spreading with w0 to wn, the code is added by the adder 2, and then multiplied by the scramble code by the multiplier 3. Further, P-SCH is added by the adder 5 in the SCH adding unit 4, and S-SCH is added by the adder 6. The S-SCH is updated every time by the S-SCH update unit 7 for each slot. Each transmission data to which P-SCH and S-SCH are added is converted into a high-frequency W-CDMA signal by the high-frequency circuit 8 and output as a radio wave.

  The downlink W-CDMA signal (measured signal a) transmitted from the base station to each mobile terminal has the transmission format shown in FIG. For example, one frame having a time width of 10 ms is composed of 15 slots 9. In each slot 9, the transmission (channel) data 13 that is code-spread and scrambled to the full length of the slot 9 and the transmission (channel) data 13 added to the transmission (channel) data 13 at the head position of the slot 9 are included. -SCH11 consisting of SCH11 and S-SCH10 is provided.

  Here, an SCH (Synchronization Channel) 12 is a physical downlink channel used for cell search (time search), and this SCH 12 includes a P-SCH (Primary SCH) 11 and an S-SCH (Secondary SCH) 10. It consists of two subchannels.

  The P-SCH 11 is set to the same value (bit data) for all the slots 9 and is used for the synchronization of the slots 9. On the other hand, the S-SCH 10 is set to a different value (bit data) for all the slots 9 and is used to identify each slot 9. Further, the S-SCH 10 is also used for identifying a scramble code.

  Therefore, the P-SCH 11 and S-SCH 10 included in the downlink W-CDMA signal transmitted from the base station to the mobile terminal are synchronized with the slot 9 and the slot 9 for each mobile terminal that has received the W-CDMA signal. It is a very important factor in carrying out identification.

  Accordingly, each mobile station (portable terminal) is changed from a base station in the third generation mobile communication system adopting the W-CDMA standard or the 3.5th generation mobile communication system adopting the HSDPA (High Speed Downlink Packet Access) standard. It is possible to easily verify that the radio wave signal transmitted to) has a data (bit data) value defined in the above-mentioned P-SCH11, S-SCH10, and SCH12 standards (3GPP TS 25.213). Development of an SCH analysis apparatus for W-CDMA signals is desired.

  The present invention has been made in view of such circumstances, and the SCH of the SCH composed of P-SCH and S-SCH from the measurement signal for one slot in the input W-CDMA signal which is the signal to be measured. By extracting the signal, an accurate P-SCH signal and S-SCH signal can be obtained independently from this SCH signal. The data (bit data) of the P-SCH signal for each slot and the S-SCH signal can be obtained. It is an object of the present invention to provide a W-CDMA signal SCH analysis apparatus that can obtain and display data (bit data) and can verify the signal quality of the W-CDMA signal with higher accuracy.

  The present invention analyzes a SCH composed of P-SCH and S-SCH added to channel data at the head position of each slot constituting one frame of a W-CDMA signal that is an input signal under measurement. It is a SCH analysis device for CDMA signals.

  In order to solve the above problems, the W-CDMA signal SCH analyzer according to the present invention includes a signal detection means for detecting a measurement signal for one slot of the input signal under measurement, and this signal detection means. SCH signal extraction means for extracting an SCH signal having a signal level and data corresponding to SCH from the detected measurement signal for one slot, and P-SCH from the SCH signal extracted by the SCH signal extraction means. A signal level detection means for detecting a P-SCH signal level corresponding to S-SCH and an S-SCH signal level corresponding to S-SCH, and an ideal S-SCH signal is created from S-SCH ideal data and S-SCH signal level Ideal S-SCH signal generation means for generating ideal P-SCH signal from P-SCH ideal data and P-SCH signal level. Means, subtracting the ideal S-SCH signal from the SCH signal to create a P-SCH signal of the signal under measurement, and subtracting the ideal P-SCH signal from the SCH signal S-SCH signal creation means for creating an S-SCH signal, and analysis result output means for displaying and outputting each data and each signal level of the P-SCH signal and S-SCH signal on the display as analysis results ing.

  In the W-CDMA signal SCH analysis apparatus configured as described above, an SCH signal having a signal level and data is obtained from the measurement signal for one slot in the signal under measurement. Further, the P-SCH signal level and the S-SCH signal level are obtained from this SCH signal.

  Further, an ideal P-SCH signal and an ideal S-SCH signal are created, and an S-- having an intended signal level and data is obtained by subtracting the ideal P-SCH signal and the ideal S-SCH signal from the SCH signal. Since the SCH signal and the P-SCH signal are obtained independently, the data (bit data) of the S-SCH signal and the data (bit data) of the P-SCH signal included in each slot are obtained and displayed as an analysis result. .

  In another invention, the W-CDMA signal SCH analyzing apparatus according to the above-described invention is compared with P-SCH signal data and S-SCH signal data, and P-SCH ideal data and S-SCH ideal data, respectively. Thus, error detection means for detecting an error included in each data of the P-SCH signal and the S-SCH signal is provided. Further, the analysis result output means displays and outputs an error included in each detected data on the display as one of the analysis results.

  In the W-CDMA signal SCH analyzing apparatus configured as described above, an error in the data (bit data) of the S-SCH signal included in each slot and an error in the data (bit data) of the P-SCH signal are obtained. Display output. Therefore, the operator (tester) of this SCH analysis apparatus displays not only the data (bit data) of the S-SCH signal and the P-SCH signal but also the presence / absence of errors in the data (bit data). Easy to check above.

  In another invention, the analysis result output means in the SCH analysis apparatus for W-CDMA signals in the above-described invention is such that each bit data of the P-SCH signal and each bit data of the S-SCH signal is P-SCH ideal data. When the bit data does not match the bit data of the S-SCH ideal data, the mismatched bit data is displayed in a different display color with respect to the matching bit data.

  In the W-CDMA signal SCH analyzer configured in this way, the mismatched bit data is displayed in a different display color with respect to the matched bit data, so the operator of the SCH analyzer (tester) It is possible to grasp at a glance which bit data out of the bit data in the P-SCH signal and the S-SCH signal is incorrect.

  According to another invention, in the SCH analyzing apparatus for W-CDMA signals in the above-described invention, when the signal level of the SCH signal extracted by the SCH signal extracting means does not reach a preset threshold value, from the beginning. A signal presence / absence determining means for determining that the SCH is not set in the slot is provided.

  In the SCH analyzing apparatus for W-CDMA signals configured as described above, it is possible to easily grasp a slot for which no SCH is set from the beginning.

  In another invention, the SCH signal extracting means in the SCH analyzing apparatus for W-CDMA signals in the above-described invention includes a data analyzing section for descrambling the measurement signal for one slot detected by the signal detecting means, and descrambling A despreading unit that despreads the received measurement signal and decodes the transmission data of each channel, a spreading unit that respreads the decoded transmission data, a scrambler that re-scrambles the spread transmission data, and a re-scramble from the measurement signal. The SCH signal detection unit detects the SCH signal by subtracting the scrambled transmission data.

  Another invention is an SCH analyzing apparatus for W-CDMA signals according to the above-described invention, wherein an ideal SCH signal creating unit for creating an ideal SCH signal from an ideal S-SCH signal and an ideal P-SCH signal, and a signal detection means And a subtracting unit that subtracts the ideal SCH signal from the measurement signal for one slot detected in step S1 and sends it to the SCH signal extracting means.

  Thus, the ideal SCH signal is created by adding the created ideal P-SCH signal and the ideal S-SCH signal, and using this ideal SCH signal, the P-SCH signal level and the S-SCH are obtained. Since the signal level is obtained, the analysis accuracy of the final P-SCH signal and S-SCH signal is improved.

  In the present invention, the SCH SCH signal composed of P-SCH and S-SCH is extracted from the measurement signal for one slot in the signal under measurement, and the ideal S-SCH signal and the ideal P-SCH signal are extracted from the SCH signal. By subtracting, an accurate P-SCH signal and S-SCH signal are obtained independently.

  Therefore, the data (bit data) of the P-SCH signal and the data (bit data) of the S-SCH signal for each slot can be separately obtained and displayed, and the signal quality of the W-CDMA signal can be verified with higher accuracy.

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

  1 and 2 are block diagrams showing a schematic configuration of an apparatus for analyzing SCH of W-CDMA signals according to an embodiment of the present invention.

  The signal under measurement a made up of a W-CDMA signal output from a base station is input to the W-CDMA signal SCH analyzer of this embodiment. As described with reference to FIGS. 9 and 10, the signal under measurement “a” is obtained by code-spreading the transmission data D0 to Dn of each channel modulated by the QPSK or 16QAM modulation method in the code spreading unit 1 and adding the adder 2 Is added again by the scramble code, and is further spread by the SCH addition unit 4, and the SCH 12 composed of the P-SCH 11 and the S-SCH 10 is added. Finally, the high frequency circuit 8 converts the frequency to a high frequency, and the base station It is one signal which has the transmission format shown in FIG.

  Note that, as shown in FIGS. 4A and 4B, there is a slot 9 in which the SCH 12 is not set from the beginning, as shown in FIGS. 4A and 4B, in the signal to be measured a composed of W-CDMA signals output from the base station.

  A signal under measurement a composed of a W-CDMA signal input to the SCH analyzer is frequency-converted to an intermediate frequency by the frequency converter 14 and then A / D converted by the A / D converter 15. The A / D converted digital measured signal a is written into the data memory 16.

  The data memory 16 can store data for several frames of the signal under measurement a having the transmission format shown in FIGS. The signal under measurement a stored in the data memory 16 is input to the correlation unit 17. The correlation unit 17 receives the ideal data 18 (set correct data) of the P-SCH 11 and S-SCH 10 set at the head of the slot 9.

  The correlation unit 17 calculates the correlation between the data of the signal under measurement a and the ideal data 18 of the P-SCH 11 and S-SCH 10. The slot position detection unit 19 obtains the leading position of each slot 9 in the signal under measurement a using the correlation result, and reads the measurement signal 20 shown in FIG. 3 for one slot in the signal under measurement a from the data memory 16. Then, the data is written into the 1-slot memory 21. More specifically, the 0th slot 9 to the 14th slot 9 constituting one frame of the signal a to be measured are sequentially read and written in the 1 slot memory 21 in order.

In the measurement signal 20 for one slot shown in FIG. 3, the existence time (section) of the SCH 12 is T _A, and the time (section) of only the communication data (channel data) 13 without the SCH (SCH signal) 12 is T _B. and then, the presence time of the SCH12 the signal level of the communication data (channel data) 13 in (section) T _a and L _D, the signal level of the nonexistent time (interval) T _B of SCH12 and L _B, SCH (SCH signal) Let L _{C be} the signal level of only 12. Further, the signal level of the P-SCH (P-SCH signal) 11 is L _P and the signal level of the S-SCH (P-SCH signal) 10 is L _S.

  The measurement signal 20 written in the 1-slot memory 21 is input to the SCH signal extraction unit 25 after the ideal SCH signal is subtracted by the subtraction unit 100. Initially, since the ideal SCH signal is not input to the subtraction unit 100, the measurement signal 20 is input to the SCH signal extraction unit 25 without being subtracted.

The SCH signal extraction unit 25 extracts a SCH signal having a signal level L _C and data corresponding to the SCH (SCH signal) 12 from the measurement signal 20 for one slot. Next, specific operations of the SHC signal extraction unit 25 will be described in order.

Descrambler 26 as a data release unit, descrambling present time SCH12 in the measurement signal 20 of the one slot, which is stored in one slot memory 21 (section) T _A scramble code 101. The despreading unit 28 despreads the descrambled measurement signal 20 using the spreading code 27 and decodes the transmission data D0,. The channel determination unit 102 determines whether the level of the decoded transmission data D0,..., Dn of each channel has reached a threshold value.

The spreading unit 103 spreads again the transmission data D0,..., Dn of each channel equal to or greater than the threshold value using the spreading code 27. Further, the scrambler 104 re-scrambles the respread transmission data using the scramble code 101, and communication data (channel data) 13 having both the signal level L _D and the data in the existence period T _A of the SCH 12. And sent to the SCH signal detection unit 105.

SCH signal detecting unit 105, the measurement signal 20 of the present time SCH12 in the measurement signal 20 of one slot (period) T _A, by subtracting the transmission data 13 obtained from the scrambling unit 104, obtain an SCH signal. As a result, the SCH signal extraction unit 25 obtains and outputs an SCH signal having a signal level L _C and data (bit data).

The correlation unit 29 calculates a correlation value between the SCH signal output from the SCH signal extraction unit 25 and the S-SCH ideal data 30 and sends it to the S-SCH signal level detection unit 31. The S-SCH signal level detector 31 obtains the ratio of the S-SCH signal included in the SCH signal having the signal level L _C from the correlation value, and the signal level of the S-SCH signal (S-SCH signal level) from this ratio L _S is calculated. The S-SCH signal level detector 31 sends the calculated S-SCH signal level L _S to the ideal S-SCH signal generator 35 of FIG.

Similarly, the correlation unit 32 calculates a correlation value between the SCH signal output from the SCH signal extraction unit 25 and the P-SCH ideal data 33 and sends it to the P-SCH signal level detection unit 34. The P-SCH signal level detector 34 obtains the ratio of the P-SCH signal included in the SCH signal having the signal level L _C from the correlation value, and the signal level of the P-SCH signal (P-SCH signal level) from this ratio L _P is calculated. The P-SCH signal level detector 34 sends the calculated P-SCH signal level L _P to the ideal P-SCH signal generator 36 in FIG.

In FIG. 2, S-SCH ideal bit data 37 is created based on the scramble code defined in the HSDPA standard (3GPP TS 25.213) described above, and the SCH adding unit 4 in FIG. This is ideal bit data incorporated in the S-SCH 10. The ideal S-SCH signal generator 35 generates an ideal S-SCH signal having the signal level L _S of the input S-SCH signal level and the bit data of the input S-SCH ideal bit data 37. To the subtracting unit 38.

  The subtracting section 38 serving as a P-SCH signal creating means subtracts the ideal S-SCH signal from the SCH signal output from the SCH signal extracting section 25, so that the measurement signal for one slot in the target signal a to be measured a. The P-SCH signal corresponding to the P-SCH 11 included in the P-SCH 11 is obtained and sent to the comparison unit 39 and the display control unit 40 as analysis result output means.

On the other hand, the P-SCH ideal bit data 41 is ideal bit data incorporated in the P-SCH 11 of the signal under measurement a in the SCH adding unit 4 of FIG. The ideal P-SCH signal creation unit 36 creates an ideal P-SCH signal having the signal level L _P of the input P-SCH signal level and the bit data of the input P-SCH ideal bit data 41. And sent to the subtracting unit 42.

  The subtracting section 42 as the S-SCH signal generating means subtracts the ideal P-SCH signal from the SCH signal output from the SCH signal extracting section 25, thereby measuring the measurement signal for one slot in the target signal under measurement a. 20, an S-SCH signal corresponding to the S-SCH 10 included in 20 is obtained and sent to the comparison unit 39 and the display control unit 40.

  The comparison unit 39 as error detection means compares each bit data of the P-SCH signal with each bit data of the P-SCH ideal bit data 41, and each bit data of the P-SCH signal is P-SCH ideal bit data. When the bit data matches 41, the corresponding bit data is determined to be normal, the mismatched bit data is determined to be abnormal, and the determination result is sent to the display control unit 40.

  Similarly, the comparison unit 42 as an error detection unit compares each bit data of the S-SCH signal with each bit data of the S-SCH ideal bit data 37, and each bit data of the S-SCH signal is S-SCH. When the bit data of the ideal bit data 37 match, the corresponding bit data is determined to be normal, the mismatched bit data is determined to be abnormal, and the determination result is sent to the display control unit 40.

The signal presence / absence determination unit 44 determines whether or not the signal level L _C of the SCH signal output from the SCH signal extraction unit 25 has reached a preset threshold value, and has not reached the threshold value. From the beginning, it is determined that the SCH 12 is not set in the slot. The signal presence / absence determination unit 44 sends the determination result to the display control unit 40.

The display control unit 40 determines whether the signal level L _C of the SCH signal output from the SCH signal extraction unit 25, the signal presence / absence determination result, the bit data of the S-SCH signal and the P-SCH signal, the match of the bit data, and the mismatch The result is displayed and output on the display 45 in units of 9 slots.

The ideal S-SCH signal output from the ideal S-SCH signal generator 35 and the ideal P-SCH signal output from the ideal P-SCH signal generator 36 are input to the ideal SCH signal generator 106. . The ideal SCH signal creation unit 106 adds the ideal S-SCH signal and the ideal P-SCH signal to create an ideal SCH signal having a signal level (L _S + L _P ) and ideal bit data, and a subtraction unit Send to 100. The subtraction unit 100 subtracts the ideal SCH signal from the measurement signal 20 written in the 1-slot memory 21 and then sends it to the SCH signal extraction unit 25.

FIG. 5 is a flowchart showing the overall operation of the W-CDMA signal SCH analyzer.
First, the slot position detector 19 detects the slot 9 of the signal under measurement a, and obtains a measurement signal 20 for one slot (step S1). Descrambler 26 in the SCH signal extraction section 25, the despreading portion 28, the channel determining unit 102, spreading section 103, scramble unit 104, both the signal level L _D and the data in the SCH presence section T _A of the measured signal a Obtained communication data (channel data) 13 is obtained (S2). Next, the SCH signal detection unit 105 obtains an SCH signal having data and a signal level L _C (S3).

Then, the S-SCH signal level detection unit 31 and the P-SCH signal level detection unit 34 obtain the signal levels L _S and L _P of the S-SCH signal and the P-SCH signal from the SCH signal, and the ideal S-SCH. The signal generator 35 and the ideal P-SCH signal generator 36 are the ideal S-SCH signal and ideal P-SCH signal having the signal levels L _S and L _P of the obtained S-SCH signal and P-SCH signal. Is created (S4).

When an instruction for recalculation of the ideal P-SCH signal and the ideal S-SCH signal is input by the operator's operation (S5), the ideal SCH signal creation unit 106 obtains the ideal S-SCH signal obtained this time. And the ideal P-SCH signal are added to create an ideal SCH signal having a signal level (L _S + L _P ) and ideal bit data (S6).

  Then, after subtracting the ideal SCH signal from the measurement signal 20 written in the 1-slot memory 21 (S7), the subtraction unit 100 returns to S2, and uses the measurement signal 20 after subtraction to transmit communication data (channel Data) 13 is started.

  Then, if the operator does not input an instruction for recalculation of the ideal P-SCH signal and the ideal S-SCH signal (S5), the subtracting units 38 and 42, from the previous SCH signal, the ideal S-SCH signal and the ideal P- By subtracting the SCH signal, a P-SCH signal and an S-SCH signal having data and signal levels are obtained (S8).

  Then, the comparison units 39 and 43 compare the bit data of the P-SCH signal and the S-SCH signal with the bit data of the P-SCH ideal bit data 37 and the S-SCH ideal bit data 41 (S9). ). The signal level of the SCH signal, each bit data of the P-SCH signal and S-SCH signal, and the comparison result of each bit data are displayed and output on the display 45 (S10).

  Thus, the measurement (analysis) processing for one slot 9 is completed. If there is an unmeasured (analysis) slot 9 in the signal under measurement a (S11), the process returns to S1 and the next to the signal under measurement a. Measurement (analysis) for slot 9 is started. If there is no unmeasured (analyzed) slot 9 in the signal under measurement a (S11), the measurement (analysis) processing for the SCH 12 in a total of 15 slots 9 constituting one frame of the signal under measurement a is terminated.

6 and 7 are diagrams showing the display contents of the analysis result of the signal under measurement a on the display 45. FIG. In FIG. 6, the display 45 shows a graph 46 from the slot 9 to the 14th slot 9 in which the signal level L _C of the SCH signal in a total of 15 slots 9 constituting one frame of the signal a to be measured. Is displayed. Further, SCH detailed information 47 of SCH 12 (SCH signal) in the slot 9 number designated by the marker in the graph 46 is displayed.

The SCH detailed information 47 includes the presence / absence (Active on off) of the SCH signal in the corresponding slot 9, the S-SCH code (SSC) number in the corresponding slot 9, the SCH signal level (Total) L _C , and the P-SCH signal. The level L _P and the S-SCH signal level L _S are included.

  Further, the display 45 in FIG. 6 displays a data list 48 of P-SCH 11 and a data list 49 of S-SCH 10 in the slot 9 of the slot 9 number designated by the marker in the graph 46. In the data lists 48 and 49, bit data (columns) constituting the P-SCH 11 and the S-SCH 10 are displayed in hexadecimal. Furthermore, by designating an arbitrary hexadecimal display with the frame 50, the corresponding hexadecimal display can be displayed with the binary display data 51.

  Further, as shown in FIG. 8, the data list 48, 49 has hexadecimal display or binary display data, the bit data of the P-SCH ideal bit data 41 and the bit data of the S-SCH ideal bit data 37. If there is unmatched bit data 52, the corresponding bit data 52 is displayed in a different display color with respect to the matched bit data.

In FIG. 7, the display 45 displays the signal level L _C of the SCH signal in each slot 9 from the 0th slot 9 to the 14th slot 9 constituting one frame of the signal a to be measured, and the P in each slot 9. The signal level L _{P of} the SCH signal, the signal level L _S of the S-SCH signal _in each slot 9, and the data list 53 of the presence or absence of the signal of the SCH signal in each slot 9 are displayed.

Further, the data list 54 of the average value of the signal level L _C of the SCH signal, the average value of the signal level L _P of the P-SCH signal, and the average value of the signal level L _S of the S-SCH signal in the 15 slots 9 is displayed. Is done.

In the W-CDMA signal SCH analyzing apparatus configured as described above, the signal from the measurement signal 20 for one slot in the signal under measurement a composed of the W-CDMA signal input to the SCH analyzing apparatus for the W-CDMA signal. An SCH signal having level L _C and data is obtained. Further, the P-SCH signal level L _P and the S-SCH signal level L _S are obtained from this SCH signal.

  Further, an ideal P-SCH signal and an ideal S-SCH signal are created, and an S-- having an intended signal level and data is obtained by subtracting the ideal P-SCH signal and the ideal S-SCH signal from the SCH signal. The SCH signal and the P-SCH signal are obtained independently. As a result, as shown in FIG. 6, the data list 48 of P-SCH 11 and the data list 49 of S-SCH 10 are displayed on the display unit 45.

  In this case, an error in the data (bit data) of the S-SCH signal included in each slot included in each slot 9 and an error in the data (bit data) of the P-SCH signal are obtained, as shown in FIG. Error bit data 52 is displayed in a different display color with respect to correct bit data.

  Accordingly, the operator (tester) of this SCH analyzer displays not only the data (bit data) of the S-SCH signal and P-SCH signal but also the presence / absence of data (bit data) on the display 44. Easy to check on the screen.

Further, in the W-CDMA signal SCH analyzing apparatus, as shown in the flowchart of FIG. 5, the ideal S-SCH signal generated by the ideal S-SCH signal generator 35 and the ideal P-SCH signal generator 36. And an ideal P-SCH signal are added to create an ideal SCH signal having a signal level (L _S + L _P ) and ideal bit data, and from the measurement signal 20 written in the one-slot memory 21, the ideal SCH After subtracting the signal, it is sent to the SCH signal extraction unit 25.

  Thus, the ideal SCH signal is created by adding the created ideal P-SCH signal and the ideal S-SCH signal, and using this ideal SCH signal, the P-SCH signal level and the S-SCH are obtained. Since the signal level is obtained, the analysis accuracy of the final P-SCH signal and S-SCH signal is improved.

The block diagram which shows schematic structure of the SCH analysis apparatus of the W-CDMA signal concerning one Embodiment of this invention The block diagram which shows schematic structure of the SCH analysis apparatus of the W-CDMA signal similarly concerning the embodiment Configuration diagram of the measurement signal for one slot in the signal under measurement Frame structure of signal under measurement 6 is a flowchart showing the overall operation of the W-CDMA signal SCH analysis apparatus according to the embodiment; The figure which shows the display content of the indicator integrated in the SCH analysis apparatus of the W-CDMA signal concerning the embodiment The figure which shows the display content of the indicator incorporated in the SCH analysis apparatus of the W-CDMA signal similarly concerning the embodiment. The figure which shows the display content of the indicator incorporated in the SCH analysis apparatus of the W-CDMA signal similarly concerning the embodiment. The figure which shows the multiplexing method of each transmission data of the transmission side in general W-CDMA General W-CDMA signal frame structure diagram

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Code spread part, 3 ... Multiplier, 4 ... SCH addition part, 8 ... High frequency circuit, 9 ... Slot, 10 ... S-SCH, 11 ... P-SCH, 12 ... SCH, 14 ... Frequency conversion part, 16 ... Data memory, 17, 29, 32 ... correlation unit, 19 ... slot position detection unit, 20 ... measurement signal, 21 ... 1 slot memory, 25 ... SCH signal extraction unit, 26 ... descrambling unit, 27 ... spreading code, 28 ... Despreading unit, 30 ... S-SCH ideal data, 31 ... S-SCH signal level detection unit, 33 ... P-SCH ideal data, 34 ... P-SCH signal level detection unit, 35 ... Ideal S-SCH signal creation unit, 36... Ideal P-SCH signal creation unit, 37... S-SCH ideal bit data, 38, 42, 100... Subtraction unit, 39, 43... Comparison unit, 40. 4 Signal presence / absence determination unit 45 ... Display unit 46 ... Graph 47 ... Detailed SCH information 48, 49, 53 ... Data list 101 ... Scramble code 102 ... Channel determination unit 103 ... Spreading unit 104 ... Scramble unit 105 ... SCH signal extraction unit 106 ... Ideal SCH signal creation unit

Claims (6)

SCH of W-CDMA signal for analyzing SCH composed of P-SCH and S-SCH added to channel data at start position of each slot constituting one frame of W-CDMA signal which is input signal to be measured In the analysis device,
Signal detection means (19) for detecting a measurement signal for one slot of the inputted signal under measurement;
SCH signal extraction means (25) for extracting an SCH signal having a signal level and data corresponding to the SCH from the measurement signal for one slot detected by the signal detection means;
Signal level detecting means (31, 34) for detecting the P-SCH signal level corresponding to the P-SCH and the S-SCH signal level corresponding to the S-SCH from the SCH signal extracted by the SCH signal extracting means. When,
Ideal S-SCH signal creation means (35) for creating an ideal S-SCH signal from the S-SCH ideal data and the S-SCH signal level;
Ideal P-SCH signal creation means (36) for creating an ideal P-SCH signal from the P-SCH ideal data and the P-SCH signal level;
P-SCH signal creation means (38) for creating a P-SCH signal of the signal under measurement by subtracting the ideal S-SCH signal from the SCH signal;
S-SCH signal creating means (42) for creating an S-SCH signal of the signal under measurement by subtracting the ideal P-SCH signal from the SCH signal;
SCH of W-CDMA signal, characterized by comprising analysis result output means (40) for displaying each data and signal level of said P-SCH signal and said S-SCH signal on a display as analysis results. Analysis device. The P-SCH signal data and the S-SCH signal data are compared with the P-SCH ideal data and the S-SCH ideal data, respectively, and included in the P-SCH signal and the S-SCH signal data. Error detection means (39, 43) for detecting errors
2. The W-CDMA signal SCH analysis apparatus according to claim 1, wherein the analysis result output means displays and outputs an error included in each detected data on a display as one of the analysis results. .   The analysis result output means is configured such that each bit data of the P-SCH signal and each bit data of the S-SCH signal are each bit data of the P-SCH ideal data and each bit data of the S-SCH ideal data. 3. The W-CDMA signal SCH analyzing apparatus according to claim 2, wherein in the case of mismatch, the mismatched bit data is displayed in a display color different from that of the matched bit data.   When the signal level of the SCH signal extracted by the SCH signal extracting means does not reach a preset threshold value, signal presence / absence determining means (44) for determining that no SCH is set in the slot from the beginning. 4. The W-CDMA signal SCH analysis apparatus according to claim 1, further comprising: a W-CDMA signal SCH analysis apparatus. The SCH signal extraction means (25)
A data analyzer (26) for descrambling the measurement signal for one slot detected by the signal detection means;
A despreading unit (28) for despreading the descrambled measurement signal and decoding transmission data of each channel;
A spreading unit (103) for spreading the decoded transmission data again;
A scrambler (104) for re-scramble the spread transmission data;
The W-CDMA signal according to any one of claims 1 to 4, further comprising: an SCH signal detection unit (105) that subtracts the re-scrambled transmission data from the measurement signal to detect an SCH signal. SCH analyzer. An ideal SCH signal creation unit (106) for creating an ideal SCH signal from the ideal S-SCH signal and the ideal P-SCH signal;
6. A subtracting unit (100) for subtracting the ideal SCH signal from the measurement signal for one slot detected by the signal detecting means and sending it to the SCH signal extracting means. The SCH analysis apparatus for W-CDMA signals according to any one of the preceding claims.

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