CN101001128A - Method and equipment for detecting reliability of decode - Google Patents
Method and equipment for detecting reliability of decode Download PDFInfo
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- CN101001128A CN101001128A CN 200610061286 CN200610061286A CN101001128A CN 101001128 A CN101001128 A CN 101001128A CN 200610061286 CN200610061286 CN 200610061286 CN 200610061286 A CN200610061286 A CN 200610061286A CN 101001128 A CN101001128 A CN 101001128A
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Abstract
This invention discloses a method for checking codes reliability including: a receiving party gets its marking distance based on the marking value of codes of a received signal, compares said distance with the threshold value, if the distance is greater than said threshold value, it decides the code is reliable, otherwise, it does not. This invention increases the accuracy of judging reliability of codes and also provides a device for testing reliability of codes.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to the method and apparatus that reliability of decode detects in the wireless communication field.
Background technology
In wireless communication system, particularly in the WCDMA system, the information after needing to guarantee to decipher is to approach the raw information of transmission to a certain degree.Because when the degree of having only information after the decoding to approach the raw information of transmission is higher than a certain thresholding, system just can operate as normal; And the degree of approaching the raw information of transmission when the information after the decoding is when being lower than this thresholding, and system then can't operate as normal.General, the degree of the information after this decoding being approached original transmitted information is referred to as reliability of decode, like this, system's operate as normal when reliability of decode is higher than a certain thresholding, system can't operate as normal when being lower than described thresholding.Contain the physical channel of CRC (CRC) bit and/or special pilot bits for those, its reliability of decode is easy to obtain by statistics CRC or pilot frequency information; And when physical channel does not comprise above-mentioned information, the method that needs a kind of good reliability of decode to detect, in general, the method for designing of adding up demodulation bit error rate by Gray code is carried out reliability of decode, and to analyze its robustness relatively poor, do not have practical value.The technical scheme of prior art for ease of saying something, is drawn transmit leg as shown in Figure 1 in the lump.Concrete demodulating process is as follows, after the recipient carries out descrambling, despreading, demodulation, decoded operation to received signal, can obtain the maximum decoding marking value of this received signal, and wherein descrambling, despreading section are optionally, only are to draw for convenience of explanation here.This process further specifies as follows: transmit leg carries out (M to transmitting, N) block encoding, this sentences M=20, N=5 is an example, coding carries out spread spectrum later, scrambling operation back is transmitted into the recipient on wireless channel, the recipient carries out descrambling successively to received signal, despreading, demodulation operation, then after demodulation operation, obtain 20 values, 20bits behind the corresponding blocks coding, decoding is actually makes dot product with each 20 dimensional vector in the code word matrix of the demodulation result of 20 dimensions and 32 * 20, add up again, like this 32 code words of traversal will obtain 32 add up and, claim this result to be decoding marking value, be the nonideal coherent accumulation of a tolerance coding back 20bits, with square making comparisons with a thresholding T of this value, think that greater than this thresholding physical channel decoding is reliable, otherwise, think that then decoding is unreliable.The judgement when decoding is correct of this technical scheme is slightly high for the reliable probability of decoding, and judgement is then lower significantly for the insecure probability of decoding during decoding error.Because judgement can bring bigger negative effect for the insecure probability of decoding when low during described decoding error, simultaneously because the gain that the decoding reliable rows is brought when higher is more limited, therefore take all factors into consideration, the detected next reliability of decode of this technical scheme is lower.
Summary of the invention
In view of this, the present invention proposes the method that a kind of reliability of decode detects, and guarantee decoding error and can rule out the insecure probability of decoding and improve greatly, like this, the lifting that the accuracy of whole reliability of decode detection method just can be bigger.
This scheme mainly may further comprise the steps: set in advance threshold value,
A, recipient obtain its decoding marking distance according to the decoding marking value of received signal;
B, with described decoding marking apart from relatively with described threshold value, if decoding marking is apart from judging then that greater than described threshold value decoding is reliable, otherwise judge that decoding is unreliable.
Preferable, in the steps A, described decoding marking value is obtained by code word matrix and received signal when the recipient deciphers to received signal, and wherein, code word matrix is by the coded system decision of transmit leg.
Preferable, described recipient obtains its decoding marking apart from being specially according to the decoding marking value of received signal:
Decoding marking is apart from the difference of two squares that is maximum decoding marking value and time maximum decoding marking value.
Preferable, the described threshold value that sets in advance is specially in advance according to false alarm probability indicator setting threshold value.
Simultaneously, the invention allows for the equipment that a kind of reliability of decode detects, this equipment comprises: decoding marking is apart from acquisition module and reliability of decode detection module, wherein:
Decoding marking is apart from acquisition module, and resulting decoding marking is worth the decoding marking distance of obtaining described received signal according to the decoding received signal, and it is passed to the reliability of decode detection module;
The reliability of decode detection module, receive decoding marking pass apart from acquisition module the decoding marking of coming apart from and with it relatively with predefined threshold value, if decoding marking is apart from judging then that greater than described threshold value decoding is reliable, otherwise judge that decoding is unreliable.
Preferable, this equipment comprises that also a threshold value is provided with module, is used to set threshold value and it is passed to the reliability of decode detection module.
Preferable, this equipment can be used as an independent community and is present in the wireless communication system or as a functional entity and is present in wireless communication system recipient's the decoding module.
The method of utilizing reliability of decode provided by the invention to detect is carried out reliability and is detected, after adopting the solution of the present invention, can judge it when correct when decoding deciphers reliable probability and does not have considerable influence, still higher, can judge the insecure probability of decoding when decoding error increases greatly, like this, take all factors into consideration, the accuracy that whole reliability of decode detects has just improved greatly.
Description of drawings
Fig. 1 is the schematic diagram of the method that reliability of decode detects in the prior art;
Fig. 2 is the schematic diagram of the method for reliability of decode detection provided by the invention;
Fig. 3 is the flow chart of the method for a kind of reliability of decode detection of the present invention;
Fig. 4 is the beneficial effect comparison diagram of the present invention and prior art;
Fig. 5 is the structure chart of a kind of reliability of decode checkout equipment provided by the invention.
Embodiment
Core concept of the present invention is: the recipient is worth the decoding marking distance of obtaining this received signal according to the resulting decoding marking of decoding after decoding, and will decipher marking apart from comparing with the threshold value that sets in advance, if decoding marking distance judges then that greater than described threshold value decoding is reliable, otherwise judges that decoding is unreliable.
From Fig. 2 as seen, the emphasis that the present invention pays close attention to has been transferred to decoding marking apart from last from decoding marking value, decoding marking value is a noncoherent accumulation behind the tolerance coding, and decoding marking distance is a tolerance to the decoding accuracy in essence, just is enhanced apart from the accuracy in detection of carrying out reliability of decode by decoding marking.
Fig. 3 is the embodiment flow chart that the method for a kind of reliability of decode detection of the present invention is specifically used in practice, and its concrete steps are as follows:
After recipient's received signal, carry out descrambling, despreading, decoding, decoding to received signal and handle, wherein descrambling and despreading are treated to optionally, can obtain the decoding marking value of received signal after decoding is handled.Specifically obtaining according to code word matrix and received signal of decoding marking value, wherein code word matrix is determined by the coded system of this signal at transmit leg.Detailed acquisition process is as follows:
Transmit leg carries out to signal that (then its code word matrix is 2 for M, N) block encoding
N* M dimensional vector, specifically constructing its code word matrix by the signal encoding mode is known technology, it or not the emphasis that the present invention pays close attention to, repeat no more herein, received signal is M * 1 dimensional vector, the recipient just obtains according to described code word matrix and received signal in when decoding and deciphers the marking value, and its method is that the decoding marking value of received signal is the product of code word matrix vector sum received signal vector, so just obtains one 2
N* 1 dimensional vector, then this 2
N2 of * 1 dimensional vector
NIndividual component is exactly 2 of a described received signal
NIndividual decoding marking value.
With M=20, N=5 is that example describes concrete computational process in detail below, if at transmit leg signal is carried out (20,5) block encoding, then code word matrix is (32,20) dimensional vector, for:
Received signal is (20,1) dimensional vector:
Decoding marking value multiplies each other for both, that is:
c
1To c
32Be exactly 32 decoding marking values of this received signal.
The decoding marking value that step 301, recipient obtain according to the decoding back is obtained the decoding marking distance of this received signal.
32 decoding marking values being calculated with step 300 are example, the recipient has obtained the decoding marking value of described received signal after deciphering to received signal, the recipient then is worth according to the decoding marking of described received signal and obtains its corresponding decoding marking distance, main process for decoding marking apart from be the maximum decoding marking value and time maximum difference of two squares of deciphering the marking value.
Whether step 302, judgement are deciphered reliable.
With decoding marking apart from comparing with the threshold value that pre-sets, if illustrate then that greater than threshold value decoding is reliable, otherwise decipher unreliable.Whether reliably described thresholding has multiple index can be used as in reality realizes and weighs decoding thresholding, as in the present embodiment, come as threshold value with false alarm probability indicator, and be 1% as setting threshold value in the present embodiment.
Decoding marking distance is the tolerance to the decoding accuracy in essence, and when decoding was correct, this value was a bigger value, and when decoding error, this value is a smaller value; What the present invention paid close attention to is decoding marking distance, under many circumstances, decoding marking value has surpassed thresholding, but decoding marking is apart from still below thresholding, when just showing as if decoding error, this just judges still that the reliable probability of decode results is just lower, obviously, weigh on the whole, the accuracy that whole reliability of decode detects has just had bigger lifting.
Be illustrated in figure 4 as the comparison diagram of the beneficial effect of the present invention and prior art, acquisition probability described in the figure 1 for decoding when correct judgement be the reliable probability of decoding, acquisition probability 2 during for decoding error judgement for deciphering insecure probability.As seen, after adopting the solution of the present invention, can judge that when decoding is correct it deciphers reliable probability and do not have considerable influence, still higher, can judge the insecure probability of decoding when decoding error increases greatly, can improve the accuracy that whole reliability of decode detects like this.
Simultaneously, the invention provides a kind of reliability of decode checkout equipment, as shown in Figure 5, this equipment comprises that decoding marking is apart from acquisition module 500 and reliability of decode detection module 501, wherein resulting decoding marking is worth the decoding marking distance of obtaining described received signal according to the decoding received signal apart from acquisition module 500 in decoding marking, it is passed to reliability of decode detection module 501, reliability of decode detection module 501 receive decoding marking pass apart from acquisition module the decoding marking of coming apart from and with it relatively with predefined threshold value, if decoding marking distance judges then that greater than described threshold value decoding is reliable, otherwise judges that decoding is unreliable.
This equipment can comprise that also a threshold value is provided with module 502, is used to set threshold value and it is passed to the reliability of decode detection module.In actual applications, can set in advance a fixing threshold value, also can by this threshold value be provided with module real-time according to actual conditions the threshold value of current use is set.
In actual applications, this equipment can be used as an independent community and is present among the recipient of wireless communication system or as a functional entity and is present in wireless communication system recipient's the decoding module.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect have been carried out further detailed description; institute is understood that; the above only is specific embodiments of the invention; not in order to restriction the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1, a kind of method of reliability of decode detection is characterized in that set in advance threshold value, this method comprises:
A, recipient obtain its decoding marking distance according to the decoding marking value of received signal;
B, with described decoding marking apart from relatively with described threshold value, if decoding marking is apart from judging then that greater than described threshold value decoding is reliable, otherwise judge that decoding is unreliable.
2, the method for a kind of reliability of decode detection as claimed in claim 1, it is characterized in that in the steps A, described decoding marking value is obtained by code word matrix and received signal when the recipient deciphers to received signal, wherein, code word matrix is by the coded system decision of transmit leg.
3, the method for a kind of reliability of decode detection as claimed in claim 1 is characterized in that, described recipient obtains its decoding marking apart from being specially according to the decoding marking value of received signal:
Decoding marking is apart from the difference of two squares that is maximum decoding marking value and time maximum decoding marking value.
4, the method for a kind of reliability of decode detection as claimed in claim 1 is characterized in that, the described threshold value that sets in advance is specially in advance according to false alarm probability indicator setting threshold value.
5, a kind of equipment of reliability of decode detection is characterized in that this equipment comprises: decoding marking is apart from acquisition module and reliability of decode detection module, wherein:
Decoding marking is apart from acquisition module, and resulting decoding marking is worth the decoding marking distance of obtaining described received signal according to the decoding received signal, and it is passed to the reliability of decode detection module;
The reliability of decode detection module, receive decoding marking pass apart from acquisition module the decoding marking of coming apart from and with it relatively with predefined threshold value, if decoding marking is apart from judging then that greater than described threshold value decoding is reliable, otherwise judge that decoding is unreliable.
6, the equipment of a kind of reliability of decode detection as claimed in claim 5 is characterized in that this equipment comprises that also a threshold value is provided with module, is used to set threshold value and it is passed to the reliability of decode detection module.
7, the equipment of a kind of reliability of decode detection as claimed in claim 5, it is characterized in that this equipment can be used as an independent community and is present in the wireless communication system or as a functional entity and is present in wireless communication system recipient's the decoding module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200610061286A CN101001128B (en) | 2006-06-22 | 2006-06-22 | Method and equipment for detecting reliability of decode |
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| CN200610061286A CN101001128B (en) | 2006-06-22 | 2006-06-22 | Method and equipment for detecting reliability of decode |
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| CN101001128A true CN101001128A (en) | 2007-07-18 |
| CN101001128B CN101001128B (en) | 2010-05-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638326A (en) * | 2011-02-14 | 2012-08-15 | 中兴通讯股份有限公司 | Method and device for judging decoding reliability |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1036808C (en) * | 1993-05-11 | 1997-12-24 | 欧林巴斯光学工业股份有限公司 | Bar code decoder with changable working ranges |
| JPH1168709A (en) * | 1997-08-13 | 1999-03-09 | Mitsubishi Electric Corp | Error detector for received digital data |
| CN1161910C (en) * | 2002-01-08 | 2004-08-11 | 华为技术有限公司 | Blind rate detection method and device based on foundamental-quartic viterbi decode |
| CN1167220C (en) * | 2002-02-07 | 2004-09-15 | 华为技术有限公司 | Method of using adaptive threshold in multipath search |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638326A (en) * | 2011-02-14 | 2012-08-15 | 中兴通讯股份有限公司 | Method and device for judging decoding reliability |
| WO2012109817A1 (en) * | 2011-02-14 | 2012-08-23 | 中兴通讯股份有限公司 | Method and device for judging reliability of decoding |
| CN102638326B (en) * | 2011-02-14 | 2015-07-22 | 中兴通讯股份有限公司 | Method and device for judging decoding reliability |
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| CN101001128B (en) | 2010-05-12 |
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