CN101489241B - Apparatus and method for detecting multimedia signal receiving performance of mobile terminal - Google Patents
Apparatus and method for detecting multimedia signal receiving performance of mobile terminal Download PDFInfo
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- CN101489241B CN101489241B CN2009100004497A CN200910000449A CN101489241B CN 101489241 B CN101489241 B CN 101489241B CN 2009100004497 A CN2009100004497 A CN 2009100004497A CN 200910000449 A CN200910000449 A CN 200910000449A CN 101489241 B CN101489241 B CN 101489241B
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Abstract
The present invention discloses a device for detecting the performance of mobile terminal for receiving the multimedia signal and a method thereof. The method comprises the following steps: analyzing synchronous signal code out from the multimedia signal code which is received and demodulated from the mobile terminal, comparing the synchronous signal code to the standard synchronous signal code for calculating the frame error code rate, and obtaining the performance of mobile terminal for receiving the multimedia signal according to the frame error code rate. The invention realizes the detection objects of high efficiency, flexibility and low cost.
Description
Technical field
The present invention relates to the wireless mobile communications field, more particularly, relate to a kind of device and method that detects multimedia signal receiving performance of mobile terminal.
Background technology
Mobile Multimedia Broadcasting more and more becomes the focus in market, and its technical development and standard are upgraded rapidly.For example the digital video broadcast-handheld formula in Europe receives transmission standard DVB-H, the single forward link standard of U.S.'s multimedia (MediaFLO) and China Mobile multimedia broadcasting standard (CMMB, China MobileMultimedia Broadcasting) or the like.China Mobile multimedia broadcasting standard (CMMB) is a kind ofly to transmit with the terrestrial wireless broadcast mode via satellite.Realization receives the system of the seamless covering of broadcast television service whenever and wherever possible on the mobile portable terminal.
By the China Mobile multimedia broadcasting industry standard CMMB system of China national General Bureau of Radio, Film and TV promulgation, be to utilize high-power S frequency range satellite-signal to cover the whole nation, utilize the common-frequency repeater coverage hole.Utilize wireless mobile communication network to make up return path.For realizing effective covering of crowded city mobile multimedia broadcast television signal, adopt the emission of U wave band terrestrial wireless to make up U wave band ground, city overlay network.
In the CMMB standard, stipulate, multiplexed sub frame (transmission frame) structure is that per second is divided into 40 time slots, each time slot 25ms, channel distribution is control logic channel (CLCH, Control logic.Channel) and service logical channels (SLCH, Service logic.Channel), wherein the control logic channel fixedly takies time slot No. 0, and each service logical channels takies one or more continuous slots since No. 1 time slot.
As shown in Figure 1, the frame structure of dividing based on time slot for multiplexed sub frame under the CMMB standard.As shown in Figure 2, be the beacon infrastructure shown in Fig. 1, indicated synchronizing signal position.As shown in Figure 3, be the relation of multiplexed frame and broadcast channel frame.
At present accepting state and the performance test means thereof to the terminal that has mobile multi-media broadcasting service are comprehensive not enough.For example: in the abnormality processing chapters and sections, explicitly call for a little less than to received signal by " in move broadcast type mobile phone television terminal test standard " and " broadcasting and TV CMMB mobile phone TV terminal test specification ", both required under weak signal, terminal has a little less than literal or the icon cue, and terminal is suspended the program of current broadcast; The terminal notifying signal recovers, and recovers to play TV programme automatically, and this is a basic rough requirement.Reality exists various interference and noise in communication, for example: China Mobile Multimedia Broadcasting operation frequency range: 2.635～2.66GHz; 470～798MHz, near IMS (the IP Multimedia Subsystem that GSM900MHz, CDMA800MHz, 2.4GHz are just arranged its frequency range, IP Multimedia System) frequency range or the like is disturbed and various noise, even it is not very weak therefore signal will occurring, but also can't search mobile media broadcasting network, this mainly is because the noise acoustic ratio is too low, and demodulation does not go out that signal causes.
In order to detect the situation that mobile multi-media broadcasting service receives in the present portable terminal, mainly be to test in the prior art by many instrument, to use many expensive instrument (as shown in Figure 4) as seeing that in national sector standard " specification requirement of terminal receptivity and the method for testing of mobile multi-media broadcasting service " the portable terminal receptivity detects, and this mode causes detection efficiency low, and because the costliness of instrument makes that also the detection cost is very high.
Summary of the invention
Technical problem solved by the invention has been to provide a kind of device and method that detects multimedia signal receiving performance of mobile terminal, to realize testing goal efficient, flexible and with low cost.
To achieve these goals, the invention provides a kind of method that detects multimedia signal receiving performance of mobile terminal, comprising:
From the multi-media signal sign indicating number that described portable terminal receives and demodulates, parse the synchronizing signal sign indicating number, and compare, calculate the frame error rate, obtain the performance of described mobile terminal receiving multimedia signal according to the described frame error rate with the synchronizing signal sign indicating number of standard.
Method of the present invention, wherein,
Segment encode in the synchronizing signal sign indicating number of described portable terminal reception and described multi-media signal sign indicating number that demodulates and standard is carried out frame period property relatively by bit, when the sign indicating number that relatively shows same position in two or more frame periods when identical, then carry out next step; Otherwise continue to carry out frame period property relatively by bit;
From the described multi-media signal sign indicating number that described portable terminal receives and demodulates, parse the synchronizing signal sign indicating number, and compare with the synchronizing signal sign indicating number of described standard, calculate the frame error rate, obtain the performance of described mobile terminal receiving multimedia signal according to the described frame error rate.
Further, wherein, the performance that obtains described mobile terminal receiving multimedia signal according to the described frame error rate further comprises:
Described portable terminal is judged the output frame indicating status according to the described frame error rate that calculates; Wherein,
When the described frame error rate greater than 10
-8And less than 10
-6The time, described output frame indicating status is an OOF;
When the described frame error rate more than or equal to 10
-6The time, described output frame indicating status is LOF;
When the described frame error rate is less than or equal to 10
-8The time, described output frame indicating status is a frame synchronization.
Further, wherein,
The synchronizing signal sign indicating number that parses in the described multi-media signal sign indicating number is the synchronizing signal sign indicating number in the beacon of control logic channel in this multi-media signal sign indicating number.
Further, wherein,
The synchronizing signal sign indicating number of described standard is the synchronizing signal sign indicating number of the standard of employing phase-locked loop; Segment encode in the synchronizing signal sign indicating number of described standard is the N bit code, and described N is greater than 1.
Further, wherein, this method also comprises:
The computer that display screen or this terminal by described portable terminal is connected to shows the described frame error rate and/or the frame indicating status of output.
To achieve these goals, the present invention also provides a kind of device that detects multimedia signal receiving performance of mobile terminal, comprising: demodulation module and control module; Wherein,
Described demodulation module is used for the multi-media signal demodulation to described portable terminal reception, and the multi-media signal sign indicating number that demodulates is sent to described control module;
Described control module, be used for parsing the synchronizing signal sign indicating number from the described multi-media signal sign indicating number that receives, and compare with the synchronizing signal sign indicating number of the standard of preserving, calculate the frame error rate, obtain the performance of described mobile terminal receiving multimedia signal according to the described frame error rate.
Device of the present invention, wherein,
Described control module, a segment encode that is further used in the synchronizing signal sign indicating number of the described multi-media signal sign indicating number that will receive and the standard of preservation carries out the comparison of frame period property by bit, when the sign indicating number that relatively shows same position in two or more frame periods when identical, then from this multi-media signal sign indicating number that receives, parse the synchronizing signal sign indicating number, and compare with the synchronizing signal sign indicating number of the standard of preserving, calculate the frame error rate, and obtain the performance of described mobile terminal receiving multimedia signal according to the described frame error rate; Otherwise continue to carry out frame period property relatively by bit.
Further, wherein,
Described control module further comprises according to the performance that the described frame error rate obtains described mobile terminal receiving multimedia signal: judge the output frame indicating status according to the described frame error rate that calculates; Wherein,
When the described frame error rate greater than 10
-8And less than 10
-6The time, described output frame indicating status is an OOF;
When the described frame error rate more than or equal to 10
-6The time, described output frame indicating status is LOF;
When the described frame error rate is less than or equal to 10
-8The time, described output frame indicating status is a frame synchronization.
Further, wherein,
The synchronizing signal sign indicating number that parses in the described multi-media signal sign indicating number is the synchronizing signal sign indicating number in the beacon of control logic channel in this multi-media signal sign indicating number.
Further, wherein,
The synchronizing signal sign indicating number of described standard is the synchronizing signal sign indicating number of the standard of employing phase-locked loop; Segment encode in the synchronizing signal sign indicating number of described standard is the N bit code, and described N is greater than 1.
Compared with prior art, the present invention can also obtain and export a lot of network informations when having realized testing goal efficient, flexible and with low cost.
Description of drawings
Fig. 1 is the frame structure schematic diagram that multiplexed sub frame is divided based on time slot under the CMMB standard in the prior art;
Fig. 2 is the structural representation of beacon shown in Fig. 1;
Fig. 3 is that multiplexed frame and broadcast channel frame concern schematic diagram;
Fig. 4 is a terminal receptivity test reference system schematic in the prior art;
Fig. 5 is the method flow diagram of the described detection multimedia signal receiving performance of mobile terminal of the embodiment of the invention.
Embodiment
By stipulating that the synchronizing signal sign indicating number is the binary pseudo-random sequence sign indicating number among the radio, film and television industry standard GY/T220.1-2006 of the People's Republic of China (PRC), be to produce by linear feedback shift register, this synchronizing signal generator polynomial is: X
11+ X
9+ 1, this 11 of synchronizing signal sign indicating number beginning is 01110101101.Because multi-media signal is multiplexing in frame, the demultiplexing prerequisite is to want signal Synchronization, so just can truly reflect the Mobile Multimedia Broadcasting reception condition of terminal by the frame synchronization situation.
Below embodiment is described in detail, but not as a limitation of the invention.
As shown in Figure 5, be the method for the described detection multimedia signal receiving performance of mobile terminal of the embodiment of the invention, specifically comprise step:
Wherein, this step 101 specifically can be N (N is more than or equal to 1) bit code (11 bit codes that present embodiment adopts the synchronizing signal sign indicating number to start with the synchronizing signal sign indicating number beginning of portable terminal reception and MFS signal code that demodulates and standard, promptly 01110101101) carries out the comparison of frame period property by bit, if when finding relatively that in a frame period MFS signal code has 11 bit codes that start with the synchronizing signal sign indicating number identical, relatively also identical in the position that the next frame period is same, then carry out step 102; Otherwise continue to carry out the comparison of frame period property when the sign indicating number that relatively shows same position in two or more frame periods is identical, carry out step 102 again by bit.
In addition, can also be that the segment encode in the synchronizing signal sign indicating number of MFS signal code and the standard that adopts phase-locked loop is carried out the comparison of frame period property by bit in the step 101.
In addition, the performance according to frame error rate P acquisition mobile terminal receiving multimedia signal further comprises in this step 102: portable terminal is judged the output frame indicating status according to the frame error rate P that calculates; Wherein,
When frame error rate P is 10
-8＜P＜10
-6The time, the output frame indicating status is an OOF;
When frame error rate P is P 〉=10
-6The time, the output frame indicating status is LOF;
When frame error rate P is P≤10
-8The time, the output frame indicating status is a frame synchronization.
Because having the standard that detects portable terminal reception Mobile Multimedia Broadcasting performance at present now is also constantly improving in the improvement, so those skilled in the art, can be by the criterion of actual verification from now on, to being provided with according to the threshold value of the frame error rate P judgment frame indicating status that obtains and the language of output frame indicating status in the method for the embodiment of the invention, the threshold value that the foregoing description is provided with and the language of output frame indicating status are only for referencial use.
Wherein, the computer that portable terminal can also connect by the display screen (LCD) or the terminal of terminal in the step 102 shows the frame error rate P and/or the frame indicating status of output.
The device of the described detection multimedia signal receiving performance of mobile terminal of the embodiment of the invention, this device comprises: demodulation module and control module (this control module can adopt embedded microprocessor); Wherein,
Demodulation module is used for the multi-media signal demodulation to the portable terminal reception, and the MFS signal code that demodulates is sent to control module.
In addition, demodulation module can pass through SPI (Serial Peripheral interface, Serial Peripheral Interface) interface with the MFS signal code that demodulates and sends to control module.
Control module, a segment encode that is used for the MFS signal code that will receive and the synchronizing signal sign indicating number of the standard of preservation carries out the comparison of frame period property by bit, when the sign indicating number that relatively shows same position in two or more frame periods when identical, then from this MFS signal code that receives, parse the synchronizing signal sign indicating number, and compare with the synchronizing signal sign indicating number of the standard of preserving, calculate frame error rate P, and export the frame error rate P that obtains, obtain the performance of described mobile terminal receiving multimedia signal according to frame error rate P.
In addition, control module is further used for N (N is greater than 1) bit code (11 bit codes that present embodiment adopts the synchronizing signal sign indicating number to start of this MFS signal code that will receive and the synchronizing signal sign indicating number beginning of the standard of preservation, promptly 01110101101) carries out frame period property relatively by bit, the N (N is greater than 1) that starts with the synchronizing signal sign indicating number of the standard of preserving is arranged when bit code is identical if in a frame period, relatively find the MFS signal code, relatively also identical in the position that the next frame period is same, then from this MFS signal code, parse synchronizing signal sign indicating number (this process is actually and parses the synchronizing signal sign indicating number in the beacon of control logic channel in this MFS signal code), and compare with the synchronizing signal sign indicating number of the standard of preserving, calculate frame error rate P, and export the frame error rate P that obtains, obtain the performance of mobile terminal receiving multimedia signal according to frame error rate P; Otherwise continue to carry out the comparison of frame period property when the sign indicating number that relatively shows same position in two or more frame periods is identical by bit, from this MFS signal, parse the synchronizing signal sign indicating number again, and compare with the synchronizing signal sign indicating number of the standard of preserving, calculate frame error rate P, and export the frame error rate P that obtains, obtain the performance of mobile terminal receiving multimedia signal according to frame error rate P.
In addition, control module can also be that the segment encode in the synchronizing signal sign indicating number of the standard of the employing phase-locked loop of this MFS signal code and preservation is carried out the comparison of frame period property by bit.
In addition, control module further comprises according to the performance that frame error rate P obtains the mobile terminal receiving multimedia signal: judge the output frame indicating status according to the frame error rate P that calculates; Wherein,
When frame error rate P is 10
-8＜P＜10
-6The time, the output frame indicating status is an OOF;
When frame error rate P is P 〉=10
-6The time, the output frame indicating status is LOF;
When frame error rate P is P≤10
-8The time, the output frame indicating status is a frame synchronization.
Here those skilled in the art can be provided with according to the threshold value of the frame error rate P judgment frame indicating status that obtains and the language of output frame indicating status control module in the device of the embodiment of the invention by the criterion of actual verification from now on, and the threshold value that the foregoing description is provided with and the language of output frame indicating status are only for referencial use.
Wherein, the frame error rate P of control module output and frame indicating status can also be connected on the computer by the display screen (LCD) of portable terminal or by the RS232 interface and show.
Demodulation module in the described device of the embodiment of the invention can be provided with outside portable terminal, in present reality, often joined in the portable terminal and used, therefore in portable terminal, adding embedded microprocessor aspect the hardware realization of device, carry out its frame error rate of detection computations by the MFS signal code that embedded microprocessor demodulates demodulation module, and directly show output by the LCD of terminal; The relative program that the described device of the embodiment of the invention uses aspect software can enroll in the engineering module of portable terminal, when portable terminal enters DEBUG state under the engineering mode, the parameter that the user customizable control module detects, and the real-time display parameter value of LCD by portable terminal.
The present invention is except the purpose of the frame error rate that can reach detection, can also obtain and export a lot of network informations, as display frame indicating status, RSSI (Received Signal Strength Indication, the indication of received signal intensity) and mobile media broadcasting network parameter or the like.
Compared with prior art, the present invention can realize testing goal efficient, flexible and with low cost in production test and field service test, can also obtain and export a lot of network informations simultaneously.
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 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 (9)
1. method that detects multimedia signal receiving performance of mobile terminal comprises:
The multi-media signal sign indicating number that portable terminal is received and demodulates carries out frame period property relatively with a segment encode in the synchronizing signal sign indicating number of standard by bit, when two or more frame periods relatively show same position yard identical the time, then carry out next step; Otherwise continue to carry out frame period property relatively by bit; Described synchronizing signal sign indicating number is the binary pseudo-random sequence sign indicating number;
From the multi-media signal sign indicating number that described portable terminal receives and demodulates, parse the synchronizing signal sign indicating number, and compare, calculate the frame error rate, obtain the performance of described mobile terminal receiving multimedia signal according to the described frame error rate with the synchronizing signal sign indicating number of standard.
2. the method for claim 1 is characterized in that, the performance that obtains described mobile terminal receiving multimedia signal according to the described frame error rate further comprises:
Described portable terminal is judged the output frame indicating status according to the described frame error rate that calculates; Wherein,
When the described frame error rate greater than 10
-8And less than 10
-6The time, described output frame indicating status is an OOF;
When the described frame error rate more than or equal to 10
-6The time, described output frame indicating status is LOF;
When the described frame error rate is less than or equal to 10
-8The time, described output frame indicating status is a frame synchronization.
3. the method for claim 1 is characterized in that:
The synchronizing signal sign indicating number that parses in the described multi-media signal sign indicating number is the synchronizing signal sign indicating number in the beacon of control logic channel in this multi-media signal sign indicating number.
4. the method for claim 1 is characterized in that:
The synchronizing signal sign indicating number of described standard is the synchronizing signal sign indicating number of the standard of employing phase-locked loop; Segment encode in the synchronizing signal sign indicating number of described standard is the N bit code, and described N is greater than 1.
5. method as claimed in claim 2 is characterized in that, this method also comprises:
The computer that display screen or this terminal by described portable terminal is connected to shows the described frame error rate of output and/or frame indicating status.
6. a device that detects multimedia signal receiving performance of mobile terminal comprises: demodulation module and control module; Wherein,
Described demodulation module is used for the multi-media signal demodulation to described portable terminal reception, and the multi-media signal sign indicating number that demodulates is sent to described control module;
Described control module, a segment encode that is used for the described multi-media signal sign indicating number that will receive and the synchronizing signal sign indicating number of the standard of preservation carries out the comparison of frame period property by bit, when the sign indicating number that relatively shows same position in two or more frame periods when identical, then from the described multi-media signal sign indicating number that receives, parse the synchronizing signal sign indicating number, and compare with the synchronizing signal sign indicating number of the standard of preserving, calculate the frame error rate, obtain the performance of described mobile terminal receiving multimedia signal according to the described frame error rate; Otherwise continue to carry out frame period property relatively by bit; Described synchronizing signal sign indicating number is the binary pseudo-random sequence sign indicating number.
7. device as claimed in claim 6 is characterized in that:
Described control module further comprises according to the performance that the described frame error rate obtains described mobile terminal receiving multimedia signal: judge the output frame indicating status according to the described frame error rate that calculates; Wherein,
When the described frame error rate greater than 10
-8And less than 10
-6The time, described output frame indicating status is an OOF;
When the described frame error rate more than or equal to 10
-6The time, described output frame indicating status is LOF;
When the described frame error rate is less than or equal to 10
-8The time, described output frame indicating status is a frame synchronization.
8. device as claimed in claim 6 is characterized in that:
The synchronizing signal sign indicating number that parses in the described multi-media signal sign indicating number is the synchronizing signal sign indicating number in the beacon of control logic channel in this multi-media signal sign indicating number.
9. device as claimed in claim 6 is characterized in that:
The synchronizing signal sign indicating number of described standard is the synchronizing signal sign indicating number of the standard of employing phase-locked loop; Segment encode in the synchronizing signal sign indicating number of described standard is the N bit code, and described N is greater than 1.
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| CN101888278B (en) * | 2010-06-13 | 2013-05-01 | 中国标准化研究院 | Interference detection method and system based on mobile communication terminal |
| CN102255677A (en) * | 2011-01-21 | 2011-11-23 | 珠海世纪鼎利通信科技股份有限公司 | Low-carbon environment-friendly China mobile multimedia broadcasting (CMMB) signal monitoring device |
| CN102523080B (en) * | 2011-11-29 | 2014-11-05 | 华为终端有限公司 | Data restoring method of data broadcasting business, terminal and server |
| CN102752098B (en) * | 2012-07-11 | 2015-08-19 | 烽火通信科技股份有限公司 | For the measurement of error code method synchronous based on pseudo-random code sequence of communication system |
| CN105635723B (en) * | 2014-11-04 | 2017-11-07 | 北京四达时代软件技术股份有限公司 | Test front end system, the system and method for CMMB product signal receptivities |
| CN106788811A (en) * | 2016-12-07 | 2017-05-31 | 海能达通信股份有限公司 | A kind of computational methods of digital communication system and the bit error rate |
| WO2018103008A1 (en) * | 2016-12-07 | 2018-06-14 | 海能达通信股份有限公司 | Digital communication system and bit error rate calculation method |
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| CN1316840A (en) * | 2000-01-28 | 2001-10-10 | 三星汤姆森Csf系统公司 | Equipment and method for testing error rate in orthogonal frequency division plaxer communication system |
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