CN1093724C - Method of estimating radio channel bit error rate in mobile digital communication system - Google Patents
Method of estimating radio channel bit error rate in mobile digital communication system Download PDFInfo
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- CN1093724C CN1093724C CN99108712A CN99108712A CN1093724C CN 1093724 C CN1093724 C CN 1093724C CN 99108712 A CN99108712 A CN 99108712A CN 99108712 A CN99108712 A CN 99108712A CN 1093724 C CN1093724 C CN 1093724C
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- 238000010295 mobile communication Methods 0.000 claims description 6
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- 238000011156 evaluation Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 15
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Abstract
The present invention relates to a method for estimating the bit error rate of a channel in a digital communication system. After a receiving end of a channel executes the steps of demodulation and decoding, the encoding (such as the encoding of fire codes) corresponding to the decoding is carried out on the receiving end; a signal sequence M is compared with a signal sequence N obtained by encoding after demodulated and before decoded; therefore, the bit error rate of a wireless channel is calculated: the bit error rate of the wireless channel =[(the number of different code elements of a decoding input sequence M and an encoding output sequence N) /(the number of the code elements of the decoding input sequence M)]*100%. The estimating method is simple and clear; few system resources are basically occupied; a fixed test pattern does not need carrying out sending and receiving circulating tests; therefore, the communication quality of channels is flexibly estimated by the encoding and decoding characteristics of various channels.
Description
Technical field
The invention belongs to communication technical field, be specifically related to the method for estimation of code error rate of wireless channel in a kind of digital communication system.
Background technology
In communication system, be the important evidence of judging systematic function to the measurement of the channel quality such as the error rate.In digital communication system, channel test means commonly used are transmitting-receiving loopback tests, be that transmitting terminal sends one section fixing test pattern, and making comparisons through this test pattern of this channel and original test pattern that receiving terminal will receive can obtain the error rate of current channel.But in real time communication, this means of testing obviously has limitation very much, such as not interrupting ongoing conversation for the test channel error rate, also can not intert into a large amount of test bit in the useful information bit for carrying out channel test.In a word, this traditional method of testing causes serious waste to system resource, and systematic function is caused adverse effect.
Summary of the invention
The method of estimation that the purpose of this invention is to provide code error rate of wireless channel in a kind of digital mobile communication system, this method can overcome the shortcoming of prior art, do not having transmitting terminal to send under the prerequisite of fixing pattern, directly the useful information that receiving terminal is received carries out channel bit error rate estimation.
The object of the present invention is achieved like this, construct the method for estimation of code error rate of wireless channel in a kind of digital mobile communication system, it is characterized in that, after the channel receiving terminal is carried out demodulation, decoding step, also encode, and, compare with deciphering preceding burst M after the demodulation, thereby the error rate that calculates wireless channel is as follows the burst N that coding obtains:
Wherein, the error correction scope of the coding method of adopting in the described coding step is greater than the possible error rate of estimation error rate channel, and this coding method is based on that the Fire code method carries out.
The method of estimation of code error rate of wireless channel in the digital mobile communication system provided by the invention, it is a kind of short and sweet and a kind of effective means of testing of occupying system resources not substantially, and through the practice test, in digital communication especially wireless communication field, have broad application prospects.In other words, method of the present invention has tangible flexibility than traditional channel bit error rate method of measurement, it is characterized in that need not fixing test pattern is received and dispatched loopback test, promptly can utilize the characteristic of various channel decodings to estimate communication quality neatly.
Description of drawings
Fig. 1 is the schematic diagram that signal data process when the inventive method is applied in the gsm system is described.
Embodiment
Below in conjunction with drawings and Examples, origin, characteristics and the application of the inventive method is described further.
According to code error rate of wireless channel evaluation method in the digital mobile communication system provided by the invention, be applicable to all digital communication systems.Be that example is described in detail now with the GSM digital cellular communication system.
As shown in Figure 1, in gsm system, information is the transmission of branch frame, the digital information A that the base station receives becomes demodulating information M after demodulator 100 demodulation, give channel decoder 200, obtain burst B through decoding, the core that the inventive method communicates quality estimation to up channel is that the result (burst B) to channel decoding is done once and the corresponding encoding process of described decoding by encoder 300 again, making comparisons by the former receiving sequence (signal M) of this coding result (burst N) and decoder 200 to calculate the error rate of present frame without chnnel coding (200) time, and this result is extended to the communication quality of wireless channel.
Make this method of the present invention become an effective prerequisite, the result of supposition decoding is our desired right-on result exactly.This hypothesis for error correcting capability very strong the sign indicating number obviously justified, at this, might as well be that example is illustrated respectively with the Fire code that is in daily use in the digital communication.
As long as Fire code itself is exactly a kind of linear block codes, it is characterized in that wrong within its error correction scope, surely guarantees that by EDC error detection and correction decode results is entirely desired right value.So this correct decode results is done after the Fire code coding, be can be used as the foundation of the former input information comparison that receives with decoder naturally.By comparing two sections sequence M and N, can obtain the number of different code elements, and the result that the total code element number of this section sequence is removed by these different code element numbers is the error rate of digital information through this wireless channel.Herein, the list entries of decoder is M, and it is N to the decode results sequence that obtains of coding that tries again that the back is finished in decoding, and so, the formula of calculating code error rate of wireless channel is as follows:
Obviously, as long as channel bit error rate is within the error correction scope of Fire code, we are with regard to an error rate that calculates current channel surely in this way in real time.
Obviously, this scheme is extremely valuable in digital wireless communication.With the GSM cellular system is example, the quality of channel quality is to judge whether the important evidence that need switch, and in fact, we but only can obtain the communication quality of down channel by the channel quality message that mobile phone reports, for up channel, we but can't calculate its definite channel bit error rate in real time.Said method provided by the invention has solved this type of problem effectively.
Claims (2)
1, the evaluation method of the code error rate of wireless channel in a kind of digital mobile communication system, it is characterized in that, after the channel receiving terminal is carried out demodulation, decoding step, also encode, the error correction scope of the coding method of adopting in this coding step is greater than the possible error rate of estimation error rate channel, and, compare with deciphering preceding burst M after the demodulation, thereby the error rate that calculates wireless channel is as follows the burst N that coding obtains
2, the evaluation method of the channel bit error rate in the digital communication system according to claim 1 is characterized in that, described coding step is based on that the Fire code coding method carries out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99108712A CN1093724C (en) | 1999-06-29 | 1999-06-29 | Method of estimating radio channel bit error rate in mobile digital communication system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN99108712A CN1093724C (en) | 1999-06-29 | 1999-06-29 | Method of estimating radio channel bit error rate in mobile digital communication system |
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| Publication Number | Publication Date |
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| CN1284822A CN1284822A (en) | 2001-02-21 |
| CN1093724C true CN1093724C (en) | 2002-10-30 |
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| CN99108712A Expired - Fee Related CN1093724C (en) | 1999-06-29 | 1999-06-29 | Method of estimating radio channel bit error rate in mobile digital communication system |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3788902B2 (en) * | 2000-10-02 | 2006-06-21 | 株式会社エヌ・ティ・ティ・ドコモ | Radio resource allocation method and communication apparatus |
| CN101272217B (en) * | 2007-03-23 | 2011-04-13 | 联芯科技有限公司 | Method and device for processing audio/video signal |
| CN101442380B (en) * | 2007-11-20 | 2013-02-13 | 大唐移动通信设备有限公司 | Method and apparatus for testing error rate based on high speed serial interface encoded mode |
| CN101227241B (en) * | 2008-02-02 | 2011-07-13 | 中兴通讯股份有限公司 | Method for estimating channel bit error rate |
| CN101304290B (en) * | 2008-06-13 | 2011-09-14 | 华为技术有限公司 | Method, system and apparatus for testing radio frequency index |
| CN102780543B (en) * | 2012-07-31 | 2015-04-08 | 京信通信***（中国）有限公司 | Method and device for estimating bit error rate |
| CN115694718A (en) * | 2021-07-26 | 2023-02-03 | 华为技术有限公司 | Link monitoring method and device |
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1999
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