CN1148913C - Self-adaptive regulating iterative frequency H-ARO receiving method - Google Patents
Self-adaptive regulating iterative frequency H-ARO receiving method Download PDFInfo
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Abstract
The present invention discloses an iterative time H-ARQ receiving method of a self-adaptive regulation encoder. The encoder at the receiving terminal uses a soft input and soft output (SISO) iterative decoding. When the encoder carries out iterative decoding, a one-time iterative process is completed, and then decoding results are output. The present invention verifies whether the decoding are correct or not through CRC, and if the decoding is correct, a correct feedback signal of the decoding is sent, and simultaneously, the decoding is terminated. If the decoding is wrong, a decoding process continues to proceed. The present invention has the advantages that iterative times can be regulated instantaneously according to the correctness or the wrongness of the decoding. On one hand, the performance of an error correcting code is fully used to reduce the time of retransmission, and on the other hand, a feedback signal is sent instantaneously to reduce decoding delay under the precondition that decoding quality is ensured.
Description
The present invention relates to the wireless high-speed data transmission technology field, relate more specifically in the wireless data transmission field, utilize CRC check information to carry out the H-ARQ method of reseptance of variable iterations decoding.
The progress of information theory aspect in recent years discloses, the time to become communication mode best in the fading channel be that best power cooperates variable rate transmission.Information-theoretical conclusion has been expressed so very simple conclusion, and promptly when channel (frequency) variation in time, the transmission means that is adopted also should change along with the Changing Pattern of channel.Based on this thought, people have given great concern to adaptive modulation and coding (AMC) and the research that mixes automatic repeat requests (H-ARQ).
In theory, AMC and H-ARQ are the approach that approaches channel capacity, and basic thought is also similar: all be based on channel feedback information, controlled sending signal.Only AMC is based on channel information (CSI), and H-ARQ is based on error code information.In the middle of the reality, the principal element that restriction AMC approaches channel capacity is that information rate (comprising counting on the coding of FEC and the planisphere) is difficult to continuous adjusting, and perhaps saying so more accurately is difficult to guaranteeing that all the coded/modulated combination all has the performance near Shannon (Shannon) limit under the information rate condition arbitrarily.The problem that H-ARQ exists is, only when increments of redundancy is tending towards infinitesimal, just can approach channel capacity, but corresponding propagation delay time will be tending towards infinitely great usually.
The existing H-ARQ technology of using interative encode method is not carried out instant adjusting according to the decoding situation to the decoder iterations, but is adopted identical iterations all the time.After finishing the decode procedure of fixed number of iterations, the output decode results is carried out CRC check, sends according to check results to retransmit or other feedback informations.
The shortcoming of prior art mainly is to regulate the decoding iterations according to receiving quality of information.Some coded system, decoding performance is to decoding iterations sensitivity, if the iterations deficiency, then decoding performance does not embody the due level of itself, and error code takes place easily; If iterations is too much, then decoding delay increases, and causes temporal waste.In a word, iterations is not enough or too much, all can influence the performance of system.
The objective of the invention is to solve and exist in the above-mentioned prior art and can not propose a kind of automatic adjusting decoder iterations H-ARQ method of reseptance according to the defective that receives quality of information adjusting decoding iterations.
Technical scheme of the present invention realizes by following method: the H-ARQ method of reseptance of described a kind of self-adaptive regulating iterative number of times, and use the decoder of soft inputting and soft output to carry out iterative decoding, this method may further comprise the steps:
(1) when decoder carries out iterative decoding, after iterative process is each time finished, just exports decode results and carry out CRC check;
(2) the described decode results of step (1) is when carrying out CRC check, and the decoder iterative decoding process is proceeded;
(3) if CRC check decoding is correct, receiving terminal sends feedback signal, and feedback signal stops the decoding of step (1) simultaneously for the decoding iterations, and decode procedure is finished;
If CRC check decoding error, the described decode procedure of step (1) is proceeded, and surpasses certain predefined value up to iterations, if this moment, decode results was still incorrect, then sends the feedback signal of decoding failure, requires to retransmit;
(4) transmitting terminal is received feedback signal, and signal is judged, if the feedback signal of decoding failure then retransmits, if the decoding iterations then sends new packet, according to iterations modulation coding mode is adjusted simultaneously.
Decoder has the maximum MH of an iterations, if iterations surpasses MH, no matter the decoding correctness, this decode procedure all comes to an end, if decoding error, the feedback signal of transmission decoding failure.
Decoder has an iterations minimum M L (the ML minimum can be 1), if iterations less than ML, is not then exported decode results and carried out CRC check.
ML and MH are a predefined value, also can dynamically adjust in retransmission processes.
Advantage of the present invention is to regulate the decoding iterations immediately according to the decoding quality, on the one hand, can give full play to the performance of error correction method, reduces number of retransmissions.On the other hand,, can send feedback signal immediately, reduce the receiving terminal feedback delay if certain iterative decoding is correct.Simultaneously, in the time of owing to CRC check, the decoder iteration is still being carried out, even CRC check goes out decoding error, also can not influence the process of whole decoding.Send iterations as feedback signal, can not only show whether decoding is correct, can also reflect the quality of received signal to a certain extent, adjust modulation coding method for transmitting terminal a foundation is provided.
Further specify method of the present invention below in conjunction with accompanying drawing.
Fig. 1 is the decoding architecture block diagram that the inventive method is used;
Fig. 2 is the flow chart of the decode procedure of the inventive method use.
Fig. 1 is the decoding architecture block diagram that the inventive method is used.FEC used in the present invention (forward error correction) comprises parallel cascade codes, serial concatenation of codes etc., because these coded systems can be used the interative encode method of soft inputting and soft output.Transmitting terminal sends the redundant information mode, whether receiving terminal merges and the merging method, depends on the mechanism of H-ARQ.The decoder 10 of receiving terminal uses the interative encode method of soft inputting and soft output.The result of decoder iterative decoding sends into CRC check 11 and carries out CRC check, judges by the CRC check result whether decoding is correct.CRC check result and the decoder common piece of iterations have decided whether termination of iterations is deciphered, and send which kind of feedback information.
Fig. 2 is the flow chart of the decode procedure of the inventive method use.Decode procedure as shown in Figure 2.At first from step S201, before the decoding, decoder iterations counter is changed to 0 (NI=O).After step S202 receives signal to be decoded, begin to carry out iterative decoding by decoder at step S203.In the every iteration of step S204 once, counter adds 1 (NI=NI+1).Whether judge NI less than ML at step S205, if judge it is sure, then flow process enters step S203, if judge whether surely, promptly when iterations NI equals certain value ML (the ML minimum is 1), then flow process enters step S206, exports and deciphers court verdict.Decode results is carried out CRC check at step S207, and iterative process is proceeded simultaneously.Judge at step S208 whether decoding is correct, if judge it is sure, even decoding is correct, and then flow process enters step S210, sends the feedback signal of this decoding iterations, stops iterative decoding simultaneously.Flow process enters step S212 then, and this deciphers end.If it is fixed to judge whether at step S208, i.e. decode results mistake, then flow process enters step S209, judges that whether NI is greater than MH.If it is fixed to judge whether, promptly NI is less than or equal to MH, and then flow process enters step S203; If judge it is sure, then flow process enters step S211, stops iterative decoding, sends the decoding failure feedback signal, and flow process also enters step S212 then, and this deciphers end.The feedback iterations has two purposes: the one, show that this is successfully decoded, and iterations illustrates that less than predefined value NH (NL, NH are a parameter of H-ARQ system, also can dynamically adjust) this is successfully decoded.The 2nd, iterations can reflect the quality of received signal, as the signal to noise ratio of received signal, for which kind of modulation coding method transmitting terminal adopts reference is provided next time.
After transmitting terminal is received feedback signal, signal is judged.If the feedback signal of decoding failure then retransmits.If the decoding iterations then sends new packet, simultaneously, the iterations that feeds back can be used as the foundation that modulation coding mode is adjusted.
Describe as can be known according to the foregoing description; though the invention discloses the H-ARQ method of reseptance that a kind of decoder that uses soft inputting and soft to export carries out the self-adaptive regulating iterative number of times of iterative decoding; but those of ordinary skill in the art can be according to the basic step of the inventive method; make amendment or be out of shape in the method that is applied to similar data transmission, its flesh and blood also should belong to the protection range of method that claims of the present invention limit.
Claims (4)
1, a kind of H-ARQ method of reseptance of self-adaptive regulating iterative number of times uses the decoder of soft inputting and soft output to carry out iterative decoding, it is characterized in that this method may further comprise the steps:
(1) when decoder carries out iterative decoding, after iterative process is each time finished, just exports decode results and carry out CRC check;
(2) the described decode results of step 1 is when carrying out CRC check, and the decoder iterative decoding process is proceeded;
(3) if CRC check decoding is correct, receiving terminal sends feedback signal, and feedback signal stops the decoding of step (1) simultaneously for the decoding iterations, and decode procedure is finished; If CRC check decoding error, the described decode procedure of step (1) is proceeded, and surpasses certain predefined value up to iterations, if this moment, decode results was still incorrect, then sends the feedback signal of decoding failure, requires to retransmit;
(4) transmitting terminal is received feedback signal, and signal is judged, if the feedback signal of decoding failure then retransmits, if the decoding iterations then sends new packet, according to iterations modulation coding mode is adjusted simultaneously.
2, method according to claim 1 is characterized in that, described decoding has the maximum MH of an iterations, if iterations surpasses MH, no matter the decoding correctness, this decode procedure all comes to an end, if decoding error, the feedback signal of transmission decoding failure.
3, method according to claim 1 is characterized in that: described decoder has an iterations minimum M L, if iterations less than ML, is not then exported decode results and carried out CRC check, described ML minimum value can be 1.
4, according to claim 2 or 3 described methods, it is characterized in that: described ML and MH are a predefined value, also can dynamically adjust in retransmission processes.
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| CNB011177616A CN1148913C (en) | 2001-05-10 | 2001-05-10 | Self-adaptive regulating iterative frequency H-ARO receiving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7237181B2 (en) * | 2003-12-22 | 2007-06-26 | Qualcomm Incorporated | Methods and apparatus for reducing error floors in message passing decoders |
| CN100369403C (en) * | 2006-02-20 | 2008-02-13 | 东南大学 | Parallel realizing method accepted by iterative detection decoding of wireless communication system |
| CN101399644B (en) * | 2007-09-26 | 2012-05-30 | 电信科学技术研究院 | Method, system and device for implementing hybrid automatic request retransmission feedback mechanism |
| CN101431395B (en) * | 2007-11-06 | 2012-04-18 | 中兴通讯股份有限公司 | Feedback information generation method |
| CN101442316B (en) * | 2007-11-21 | 2010-12-15 | 中国科学院微电子研究所 | Parity check code iterative interpretation method capable of dynamically regulating most iterative number |
| CN101651532B (en) * | 2009-08-27 | 2013-03-13 | 华为技术有限公司 | Hybrid automatic retransmission request processing method and device under spatial multiplexing mode |
| CN102833039B (en) * | 2012-08-03 | 2015-01-28 | 东南大学 | Large iteration receiving method used in hybrid automatic repeat request system |
| WO2015120575A1 (en) * | 2014-02-11 | 2015-08-20 | 华为技术有限公司 | Channel decoding method and apparatus, and distributed decoder |
| WO2016078083A1 (en) | 2014-11-21 | 2016-05-26 | 华为技术有限公司 | Method, apparatus and device for determining modulation and coding scheme |
| CN104618074A (en) * | 2014-12-30 | 2015-05-13 | 合肥金星机电科技发展有限公司 | Data communication method |
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