CN1773865A - A Circulating redundant check testing method and apparatus thereof - Google Patents

Abstract

A calibration test method of cyclic redundance includes setting test receiving command after test mode is entered on base station of mobile phone, setting detection unit and outputting scrambled information, confirming 16 bit user word position before user information and CRC data are descrambled, carrying out descramble process to user information before cyclic redundant calibration test is done, using detection unit to carry out cyclic redundant calibration test to totally restored original user information and totally restored CRC data.

Description

A kind of cyclic redundancy check (CRC) method of testing and device thereof

Technical field

The present invention relates to a kind of CRC (Cyclic Redundancy Check, cyclic redundancy check (CRC)) method of testing and device thereof, particularly relate to (Time Division Multiple Acess based on TDMA, time division multiple access) the up CRC method of testing and the device thereof of the mobile communcations system of the PHS of mode (Personal Handy Phone System, personal handyphone system) base station.

Background technology

According to RCR (the Association of Radio Industries and Businesses) STD-28 agreement, frame structure as shown in Figure 1 for the up TCH of PHS base station operation system (Traffic Channel Handle, Traffic Channel).When up TCH frame was carried out static test, in order to simulate actual call-information better, the pseudo random sequence code that the user profile part of this frame usually adopts the PN9 algorithm to produce was filled, and error code testing has a lot of methods, and CRC also is a kind of bit error detection method commonly used.It usually is attached to the information back and the data that will detect and sends together, and its length is 16 bits, detects this frame data as the redundant information of frame data for signalling device and uses.Because its strong detectability and the characteristics of carrying out have easily obtained utilization widely.

For example United States Patent (USP) (6,427,219 METHOD AND APPARATUS FOR DETECTINGAND CORRECTING ERRORS USING CYCLIC REDUNDANCY CHECK) also utilizes 16 CRC data that the PHS system is carried out Error detection.Send the data that contain the CRC information bit by the base station, receive by mobile unit, it is identical with the data that the base station sends that mobile unit is used for carrying out the data that CRC detects, and the CRC data of usefulness oneself compare and judge error condition after mobile unit is come Data Receiving like this.But, in the communication system of reality, usually need user data information is carried out encryption, just scrambled code is handled, and prevents frequent continuous " 1 " or continuous " 0 " sign indicating number of occurring in the data transmission procedure, improves the transparency of transfer of data.After frame data comprise that 16 CRC data are all by scrambled code, be impossible if directly use 16 CRC data to carry out Error detection.The detection method of above-mentioned patent has the following disadvantages:

First: under the situation that has scrambler to exist, the detection method in this patent can not directly be used, and must could use the method for mentioning in the above-mentioned patent earlier after the past scrambler is handled to the data that reception is come;

Second: above-mentioned patent and prior art be can not determine the position of CRC data in the uplink data frames for this class communication system of PHS, that is to say frame data receive come after, can not find 16 CRC data exactly.

Therefore, how just can find descrambling code processing method and step, determine the position of CRC data in the uplink data frames, improve the cyclic redundancy check (CRC) content measurement, realize better Error detection, reduce error burst, improve the confidence level of up error code testing, become a big problem that needs to be resolved hurrily in the current communication field.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of cyclic redundancy check (CRC) method of testing and device thereof, solve in the prior art and can't handle in the CRC method of testing of a kind of up TCH frame under the scrambling situation of PHS base station, the method of descrambling code and step be can not determine the problems such as position of CRC data in the uplink data frames.

To achieve these goals, the invention provides a kind of cyclic redundancy check (CRC) method of testing, under the scrambling situation, carry out the CRC test in order to a kind of up TCH frame to the PHS base station, handle descrambling code, determine the position of CRC data in the uplink data frames, improve the CRC content measurement, it is characterized in that, comprise the steps: step 1, the PHS base station power on enter test pattern after, test is set receives order; Step 2 is carried out the setting of detecting unit then, the output scrambled signals; Step 3 is determined the position of 16 user's words; Step 4 is carried out descrambling code to user profile and is handled; And step 5, to original user information and the CRC data of recovering fully, utilization detecting unit and cyclic redundancy check (CRC) multinomial algorithm carry out the CRC test; Wherein, PHS is a personal handyphone system, and the TCH frame is a traffic channel frame, and CRC is a cyclic redundancy check (CRC).

Above-mentioned cyclic redundancy check (CRC) method of testing, wherein, the content that test reception order is set in the described step 1 comprises: the mode of operation that the PHS base station is set is a receiving mode, makes the demodulating system of PHS base station in running order, and modulating system is in off state; Receiving slot to be tested is set; The type that test frame is set is the TCH frame; And the test frequency is set, for radio frequency unit provides a stable working frequency points.

Above-mentioned cyclic redundancy check (CRC) method of testing, wherein, the content that is provided with of detecting unit comprises in the described step 2: in sending mode, working frequency points and the scramble information identical with described working frequency points is set; In receiving mode, user's word is set, and the frame type that receives is made as the TCH frame.

Above-mentioned cyclic redundancy check (CRC) method of testing, wherein, the position of determining 16 user's words in the described step 3 comprises the steps: steps A, the cycle of foundation is 5 milliseconds a frame signal; Step B, the position on adjustment frame signal edge; Step C judges whether four time slots all get through, if can not all get through, then carries out described step B, continues to adjust the position on frame signal edge; If can all get through, execution in step D then; Step D under call mode, measures and receives the position of data starting point apart from the frame signal edge; Step e is determined the original position of single time slot window,, the position of search window of 16 user's words of first time slot of receiving slot as original position, is determined in the position on frame signal edge that is; Step F is determined four receiving slot windows,, the first time slot window is expanded 240 bits, 480 bits, 720 bits successively that is, obtain respectively receiving slot second and third, the position of the search window of 16 user's words of four time slots; Reach step G, determine the position of 16 user's words.

Above-mentioned cyclic redundancy check (CRC) method of testing, wherein, the descrambling code in the described step 4 is handled and is comprised the steps: steps A, determines the user profile data original position of four time slots according to the position of 16 user's words; Step B is provided with and the identical descrambling code information of scramble information; And step C, the utilization Descrambling Algorithms is carried out the descrambling code processing,, the same number of twice XOR of a number is restored that original number that is.

Above-mentioned cyclic redundancy check (CRC) method of testing, wherein, described Descrambling Algorithms comprises the steps: steps A, at first notes the XOR result of described user profile data and the 16th bit data, this result is as the value of the 1st bit data S0; Step B has just obtained the 6th bit data S5 with described result and the 5th 's value S4 XOR; And step C, the 6th bit data S5 and the 12nd 's value S11 XOR has just been obtained the 13rd bit data S12; Wherein, S represents the state value of a certain position in shifting process in 16 bit data in the shift register, and the serial shift direction of whole data is for moving right.

Above-mentioned cyclic redundancy check (CRC) method of testing wherein, comprises that also the error rate detects, and it carries out Error detection in order to the user profile after descrambling code is handled.

To achieve these goals, the present invention also provides a kind of cyclic redundancy check (CRC) testing apparatus, under the scrambling situation, carry out the CRC test in order to a kind of up TCH frame to the PHS base station, it is characterized in that, comprise as lower module: a computer, it links to each other with PHS base station communication mouth, in order to set up test environment, issues test command control test; One PHS base station comprises base station communication mouth, receiving element and demodulating system; The test instruction that it issues in order to receiving computer, the analog signal that detecting unit is contained enciphered message is demodulated into digital signal, and this digital signal comprises 16 CRC data, and this digital signal is passed to detecting unit; Wherein, receiving element is in order to receive the analog signal in the detecting unit, and demodulating system is in order to be demodulated to digital signal with the analog signal in the receiving element; One detecting unit, it directly links to each other with the PHS base station, for the PHS base station provides analog signal, the frame and the scrambled signals of TCH type are set, and this scrambled signals offered the demodulating system of PHS base station, and the user profile that the receiving element descrambling code was handled is carried out the CRC test, draw error condition; And a test cable, it is in order to connect into a test macro of finishing with described computer, PHS base station, detecting unit; Wherein, PHS is a personal handyphone system, and the TCH frame is a traffic channel frame, and CRC is a cyclic redundancy check (CRC).

Above-mentioned cyclic redundancy check (CRC) testing apparatus, wherein, described digital signal can comprise demodulating data, cooperate the clock and the triggering signal of demodulating data.

Above-mentioned cyclic redundancy check (CRC) testing apparatus, wherein, described detecting unit in order to when triggering signal when arriving, cooperating receive clock to begin to receive will demodulated data, and compares the output error condition with himself data.

Above-mentioned cyclic redundancy check (CRC) testing apparatus, wherein, described test cable is a non-standard p-wire that contains three cable ends and two plugs, wherein,

Described three cable ends, it links to each other with detecting unit respectively in order to data, clock, the triggering signal with described PHS base station demodulating system; And

Described two plugs, it is in order to connect into a test macro of finishing with described computer, PHS base station, detecting unit; The one end connects described computer, and the other end links to each other with the communication port of described PHS base station.

CRC testing apparatus and the method for a kind of up TCH frame under the scrambling situation of the PHS base station that the present invention proposes, remedy 16 the CRC data of how under the scrambled code situation, utilizing that do not relate in the existing patent and carried out the content of error code testing, provided the method for determining 16 CRC data simultaneously, owing to when determining the position of user's word, used the technology of " window ", not only reduced error burst but also improved the positioning accuracy of user's word.This method mainly is to realize in the software receiver module, has greatly simplified hardware and has connected the ground complexity, and scrambler is set this method and descrambling code is flexible to operation, simulated actual conversation environment preferably, greatly improved the confidence level of test.For the up error code testing of PHS system provides complete apparatus and method.

Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.

Description of drawings

Fig. 1 is the up TCH frame assumption diagram of PHS base station;

Fig. 2 is the CRC testing apparatus figure of a kind of up TCH frame under the scrambling situation of PHS base station;

Fig. 3 is the CRC test flow chart of a kind of up TCH frame under the scrambling situation of PHS base station;

Definite flow chart of " window " that Fig. 4 uses for four time slots of up TCH frame of PHS base station;

Fig. 5 is a kind of up TCH frame Descrambling Algorithms of PHS base station;

Fig. 6 is a kind of up TCH frame CRC algorithm of PHS base station.

Embodiment

As shown in Figure 1, be the up TCH frame assumption diagram of PHS of the present invention base station, be mainly concerned with PR (Preamble), user, CI (Channel Identifier), I (Information) and these five titles of CRC.Wherein PR is a clock synchronization information, is 6 fixing binary numbers 011001 in up TCH frame; User's word is a personal code work, generally is made up of individual and group address two parts, and it is 16 definite system numbers at up TCH frame; CI is a logical channel identifier, is 4 bits of fixing 0000 in up TCH frame; It is 160 bits that transmitting subscriber identify bit, its data width are wanted in the I representative, and its content is a speech information under the normal talking state; Under test pattern in order to simulate the different characteristics of speech information each under the talking state preferably, adopted the PN9 algorithm, the pseudo random sequence that produces is calculated the original position of user profile according to the position of user's word usually, thereby is correctly exported this part information as user profile; CRC is one 16 Error detection position.

The hardware unit figure of the CRC test of a kind of up TCH frame under the scrambling situation of PHS base station is proposed for the present invention as shown in Figure 2.This device is made up of computer, PHS base station, detecting unit.20 expression computers link to each other with the base station communication mouth, are mainly used to issue test command control test; 21 represent the communication modes of computer and base station communication mouth; 22 represent the PHS base station, be mainly used to receive the analog signal that contains enciphered message in the present invention it is demodulated to digital signal, simultaneously the result are passed to detecting unit and carry out Error detection; 23 representatives can comprise triggering signal, demodulating data and clock from the information of base station demodulating system, and these information are passed to the detecting unit shown in 25, carry out CRC and detect; 24 expressions contain the analog signal of enciphered message.

As shown in Figure 3, for a kind of up TCH frame proposed by the invention CRC method of testing flow chart under the scrambling situation, below this flow chart is elaborated.

After the base station powers on and enters test pattern, test command is set in step 30, and its content comprises that the mode of operation of base station is set to receiving mode, and the demodulating system of base station is in running order like this, and modulating system is in off state, prevents that modulation signal from disturbing; It mainly is clearly which time slot of four receiving slots to be tested that time slot is set; The type of test frame is that the TCH frame is tested for the present invention, and the test frequency is to provide a stable working frequency points to radio frequency unit.

Next carry out the setting of detecting unit in step 31, its main setting thes contents are as follows: in sending mode, it is identical with working frequency points in the above-mentioned steps 30 that working frequency points is set, and scramble information is set simultaneously; In receiving mode, user's word is set, the frame type of reception is TCH.

After confirming to set, open radiofrequency signal output switch, signal is poured into the base station.The data that demodulating system demodulates contain scrambling code information at this moment, here should be noted that demodulating data is not all to contain scrambler, the data segment position of containing scrambler is the end number since 16 user's words, the beginning of the 21st bit data all contains scramble information to the 196th bit data, from Fig. 1, just user profile I and 16 CRC data segments all contain scrambling code information.Must determine the original position of user profile and CRC earlier in order to carry out descrambling, because the content that strong signal is separated 16 user's words in the timing TCH frame is 16 fixing figure places, separate timing in weak signal, according to RCR STD28 agreement, allowing one in 16 user's words at most makes mistakes, this has 16 kinds of user's words, but to a fixing weak signal, 16 user's words are also fixed.Because user's word can not handled by scrambling, the position of therefore locating 16 user's words exactly becomes key.Used the technology of " window " in definite process of user's word, improved the accuracy of user's word search, how the back will to determining that window is elaborated.The position of determining user's word is the content of step 32.

Must carry out descrambling code to the user profile data earlier before carrying out acceptance test handles.Descrambling is just to restore that original principle of counting according to the same number of twice XOR of a number to realize, be illustrated in figure 5 as a kind of up TCH frame Descrambling Algorithms of PHS of the present invention base station, promptly, the Descrambling Algorithms of step 33, used descrambling multinomial initial value are exactly the scrambler value in the detecting unit setting option of front.The descrambling scope is the end number since 16 users, the 21st bit data to begin to the 196th bit data be I and CRC part among Fig. 1.After descrambling is finished, in step 34, original user information and the CRC data recovered are fully carried out error checking.Be illustrated in figure 6 as the used CRC algorithm of a kind of up TCH frame of PHS base station, wherein, " S " represents the state value of a certain position in shifting process in 16 bit data in the shift register.At first note the XOR result of input data and the 16th bit data, this result is as the value of the 1st bit data S0; This result and the 5th 's value S4 XOR has just been obtained the 6th bit data S5; This result and the 12nd 's value S11 XOR has just been obtained the 13rd bit data S12.The serial shift direction of whole data is for moving right.This polynomial initial value is set to 16 " 1 ".Carry out the end number of the scope of error code testing since 16 user's words, beginning to the 196th bit data of the 1st bit data is that CI and 196 bit data between the CRC among Fig. 1 all will be carried out Error detection.Error detection result detects in the position of 16 users' of distance end the 197th bit, show that data are correct if the polynomial value in this position is 16 " 0 ", otherwise data has error code.

The dotted portion of step 35 is complementary, purpose is that the user profile behind the descrambling is carried out Error detection, with the data behind the descrambling just since 16 users' end number, the beginning of the 21st bit data all given detecting unit to 160 user profile between the 180th bit data and compares the output error condition by it, the correctness that also can judge demodulating system from error condition whether, whether the checking descrambling correct.

As shown in Figure 4, definite flow chart of " window " used for PHS of the present invention base station four time slots of up TCH frame is used for determining user's word location.In step 40, must set up a frame signal earlier, the cycle is 5 milliseconds.This signal is the bridge of contact test module and demodulation module.Can arrange the high level of this signal or low level opening flag as restituted signal, estimate demodulating system earlier and be circulated into the demodulation latencies that demodulates digital signal from analog signal, rising edge or trailing edge are set to 2.5 milliseconds of these positions that add demodulation latencies, finely tune repeatedly position to the edge near this position then, till any one time slot in 4 receiving slots can both clearly be got through, this was the task of step 41-42.Just can carry out step 43 after getting through, utilize oscilloscope under call mode, to measure the original position of the data that frame signal edge and actual reception arrive, here should be noted that, the result and second time slot from the measurement of first time slot, the 3rd time slot, it is promptly 625 delicate that the result that the 4th time slot is measured differs 240 bits successively, obtained frame signal edge and actual reception to the original position of data between " distance " be converted into data bit, this result is added 12 bits, just obtained the starting position of user's word region of search, again this original position is added that 28 bits have just obtained the final position of the region of search of user's word, have determined one " window " by these two positions.During the software concrete operations, can set up the counter of one 1920 system again, go out several clocks as counting clock with what transmit demodulating data, with frame along as synchronous reset signal, that is to say that this counter when arriving when frame begins counting, count above-mentioned two positions respectively after, be set to high level between this position with this signal, other place all is set to low level, and the hunting zone of user's word is limited to the high level zone of window.After in step 44, having obtained " window " signal of first time slot, " window " signal of first time slot opened up respectively backward prolong 240 bits, 480 bits, 720 bits, just obtained " window " of second time slot, the 3rd time slot, the 4th time slot successively, this is the content in the step 45.The width of above-mentioned " window " is the width of 16 user's words of standard, do not have in data under the situation of shake, can find 16 user's words fully, but system is in actual moving process, consider and be subjected to internal system and external interference inevitably, when clock is shaken under the condition of system's permission, data also can be shaken, in order to improve the practicality of " window ", the front and back position of this " window " can be relaxed, because 6 Bit datas in the PR zone in forward position, territory, user block in a TCH frame be fix 011001, behind user's word the CI zone on edge in a TCH frame be fix 0000, the forward position is relaxed to the PR zone, the back is along relaxing to the CI zone, promptly the width of " window " is 26 bits, according to the feature of the data in PR zone and CI zone, this is can not influence searching of 16 user's words, simultaneously again can be under the situation that the demodulating data of system's permission is shaken among a small circle, search satisfactory 16 user's words, improve the anti-interference of test macro.Because the front is mentioned user profile and is filled with the PN9 pseudo random sequence code in the test of TCH frame, therefore 16 user's words can occur with certain probability, and 16 bit data identical that occur in the user profile serious error code testing of interference user information not only with user's word, and can influence the accurate location of 16 CRC data of user profile and back, these data are misplaced.There has been window just can shield search, guaranteed the position of the position of 16 user's words, 160 user profile data and the position of 16 CRC data are located exactly the bogus subscriber's word that occurs in the user profile.

As long as determined user's word, the original position of 16 CRC data is also all right in the TCH frame has determined, since 16 users' end number, the 181st bit data to begin to the 196th bit data be CRC part among Fig. 1, this part data is exactly the data of mentioning in the patent that are used to detect.Under the situation of signal scrambling, this part data has only earlier just can be used for Error detection through behind the descrambling.

CRC testing apparatus and the method for a kind of up TCH frame under the scrambling situation of the PHS base station that the present invention proposes, replenish for the problem of under the scrambling situation, how to carry out Error detection that does not relate in the above-mentioned patent, simultaneously for when utilizing 16 CRC data to carry out Error detection, position how to determine these data also illustrates, has used the technology of " window " to improve the accuracy of user's word, user profile, CRC position in definite TCH frame among the present invention simultaneously.The apparatus and method that the present invention proposes, comparison system has intactly been set forth a kind of up TCH frame static test of PHS base station and has been realized the device of this method, has use flexible characteristic simple to operate.

Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (11)

1, a kind of cyclic redundancy check (CRC) method of testing is carried out the CRC test in order to a kind of up TCH frame to the PHS base station under the scrambling situation, it is characterized in that, comprises the steps:

Step 1, the PHS base station power on enter test pattern after, test is set receives order;

Step 2 is carried out the setting of detecting unit then, the output scrambled signals;

Step 3 is determined the position of 16 user's words;

Step 4 is carried out descrambling code to user profile and is handled; And

Step 5, to original user information and the CRC data of recovering fully, utilization detecting unit and cyclic redundancy check (CRC) multinomial algorithm carry out the CRC test;

Wherein, PHS is a personal handyphone system, and the TCH frame is a traffic channel frame, and CRC is a cyclic redundancy check (CRC).

2, cyclic redundancy check (CRC) method of testing according to claim 1 is characterized in that, the content that test reception order is set in the described step 1 comprises:

The mode of operation that the PHS base station is set is a receiving mode, makes the demodulating system of PHS base station in running order, and modulating system is in off state;

Receiving slot to be tested is set;

The type that test frame is set is the TCH frame; And

The test frequency is set, for radio frequency unit provides a stable working frequency points.

3, cyclic redundancy check (CRC) method of testing according to claim 2 is characterized in that, the content that is provided with of detecting unit comprises in the described step 2:

In sending mode, working frequency points and the scramble information identical with described working frequency points is set;

In receiving mode, user's word is set, and the frame type that receives is made as the TCH frame.

4, cyclic redundancy check (CRC) method of testing according to claim 1 is characterized in that, the position of determining 16 user's words in the described step 3 comprises the steps:

Steps A, the cycle of foundation is 5 milliseconds a frame signal;

Step B, the position on adjustment frame signal edge;

Step C judges whether four time slots all get through, if can not all get through, then carries out described step B, continues to adjust the position on frame signal edge; If can all get through, execution in step D then;

Step D under call mode, measures and receives the position of data starting point apart from the frame signal edge;

Step e is determined the original position of single time slot window,, the position of search window of 16 user's words of first time slot of receiving slot as original position, is determined in the position on frame signal edge that is;

Step F is determined four receiving slot windows,, the first time slot window is expanded 240 bits, 480 bits, 720 bits successively that is, obtain respectively receiving slot second and third, the position of the search window of 16 user's words of four time slots; And

Step G determines the position of 16 user's words.

5, cyclic redundancy check (CRC) method of testing according to claim 1 is characterized in that, the descrambling code in the described step 4 is handled and comprised the steps:

Steps A is determined the user profile data original position of four time slots according to the position of 16 user's words;

Step B is provided with and the identical descrambling code information of scramble information; And

Step C, the utilization Descrambling Algorithms is carried out the descrambling code processing,, the same number of twice XOR of a number is restored that original number that is.

6, cyclic redundancy check (CRC) method of testing according to claim 5 is characterized in that, described Descrambling Algorithms comprises the steps:

Steps A is at first noted the XOR result of described user profile data and the 16th bit data, and this result is as the value of the 1st bit data S0;

Step B has just obtained the 6th bit data S5 with described result and the 5th 's value S4 XOR; And

Step C has just obtained the 13rd bit data S12 with the 6th bit data S5 and the 12nd 's value S11 XOR;

Wherein, S represents the state value of a certain position in shifting process in 16 bit data in the shift register, and the serial shift direction of whole data is for moving right.

7, cyclic redundancy check (CRC) method of testing according to claim 1 is characterized in that, comprises that also the error rate detects, and it carries out Error detection in order to the user profile after descrambling code is handled.

8, a kind of cyclic redundancy check (CRC) testing apparatus carries out the CRC test in order to a kind of up TCH frame to the PHS base station under the scrambling situation, it is characterized in that, comprises as lower module:

One computer, it links to each other with PHS base station communication mouth, in order to set up test environment, issues test command control test;

One PHS base station comprises base station communication mouth, receiving element and demodulating system; The test instruction that it issues in order to receiving computer, the analog signal that detecting unit is contained enciphered message is demodulated into digital signal, and this digital signal comprises 16 CRC data, and this digital signal is passed to detecting unit; Wherein, receiving element is in order to receive the analog signal in the detecting unit, and demodulating system is in order to be demodulated to digital signal with the analog signal in the receiving element;

One detecting unit, it directly links to each other with the PHS base station, for the PHS base station provides analog signal, the frame and the scrambled signals of TCH type are set, and this scrambled signals offered the demodulating system of PHS base station, and the user profile that the receiving element descrambling code was handled is carried out the CRC test, draw error condition; And

One test cable, it is in order to connect into a test macro of finishing with described computer, PHS base station, detecting unit;

Wherein, PHS is a personal handyphone system, and the TCH frame is a traffic channel frame, and CRC is a cyclic redundancy check (CRC).

9, cyclic redundancy check (CRC) testing apparatus according to claim 8 is characterized in that, described digital signal can comprise demodulating data, cooperate the clock and the triggering signal of demodulating data.

10, cyclic redundancy check (CRC) testing apparatus according to claim 8, it is characterized in that, described detecting unit in order to when triggering signal when arriving, cooperating receive clock to begin to receive will demodulated data, and compare the output error condition with himself data.

11, cyclic redundancy check (CRC) testing apparatus according to claim 8 is characterized in that, described test cable is a non-standard p-wire that contains three cable ends and two plugs, wherein,

Described three cable ends, it links to each other with detecting unit respectively in order to data, clock, the triggering signal with described PHS base station demodulating system; And

Described two plugs, it is in order to connect into a test macro of finishing with described computer, PHS base station, detecting unit; The one end connects described computer, and the other end links to each other with the communication port of described PHS base station.

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