CN101877629B - HARQ (Hybrid Automatic Repeat Request) retransmission method and equipment based on convolutional turbo coding - Google Patents
HARQ (Hybrid Automatic Repeat Request) retransmission method and equipment based on convolutional turbo coding Download PDFInfo
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Abstract
The invention relates to an HARQ (Hybrid Automatic Repeat Request) retransmission method which comprises the following steps of: coding information to be transmitted into parts of information bit, retained check bit and deleted check bit by utilizing a convolutional Turbo coding method; and aiming at the first transmission and the following n retransmissions of parts of the information bit to be transmitted, the retained check bit and the deleted check bit, modulating the corresponding parts to be transmitted on every two continuous transmissions respectively by adopting different modulation mapping ways and emitting a modulated signal, wherein n is an integer which is larger than or equal to zero. The performance of a transmission mechanism of the invention is better than that of the traditional HARQ transmission mechanism III, meanwhile, the robustness during transmission is improved.
Description
Technical field
The present invention relates to wireless mobile communications, more specifically, relate to a kind of HARQ repeating method and equipment thereof based on convolution turbo coding
Background technology
Along with the development of wireless traffic, HARQ is playing the part of more and more crucial role in wireless communication field.This mainly contains the reason of two aspects: first, mostly wireless traffic is in the future asymmetric, the paroxysmal Packet data service of upper and lower property, not high to delay requirement, and the quality of data of transmission is but had to very high requirement.Secondly, wireless propagation environment is very complicated.To received signal, not only there is various declines, the mobile Doppler's translation causing, and be subject in addition the impact of various interference and noise.These declines and interference easily cause random error and burst error will have a strong impact on transmission quality.
HARQ technology claims again mixed automatic retransmission request, is a kind of of error-control technique.The object of error-control technique is to improve the transmission quality of signal, guarantee information reliability.Except HARQ, also exist two kinds of main modes for error control: forward error correction (FEC) and error detection add autonomous retransmission (ARQ).FEC technology is carried out error correction according to receiving redundant information in data, and feature is " only entangle and do not pass ".ARQ technology relies on error code to detect and re-send request may ensures signal quality, and feature is " only pass and do not entangle ".
HARQ technological synthesis the advantage of FEC and ARQ, be a kind of error correction method that FEC and ARQ are combined.According to HARQ technology, transmitting terminal can send the data with certain redundant information.First receiving terminal carries out FEC, if still correctly demodulation requires transmitting terminal to resend data.Therefore, HARQ has avoided FEC to need complicated decoding equipment and the poor shortcoming of ARQ mode information continuity, and can make the whole system error rate very low.
Conventionally, HARQ is divided three classes, and is respectively I type HARQ (HARQ-I), II type HARQ (HARQ-II), III type HARQ (HARQ-III).
The I type HARQ course of work is as follows: receiving terminal, after error correction is unsuccessful, abandons the bag receiving completely, and requires to make a start re-transmission.The same by with the last time of the packet retransmitting.
II type HARQ belongs to the ARQ mechanism of steadily increase redundancy (Incremental Redundancy).In HARQ-II, the misdata Bao Buhui receiving is dropped immediately, and packet to be retransmitted receives, and carries out decoding after wrong packet combining again, so just can increase substantially error correcting capability.But the shortcoming that II type HARQ exists is that data retransmission is redundant information, does not comprise systematic bits.Therefore when the packet transmitting is for the first time during by heavy damage, cannot recovery system bit.
III type HARQ improves II type HARQ, and the code word of re-transmission has the ability of self-demarking code, and does not rely on the data of transmission for the first time.In addition, different according to the redundancy versions retransmitting, HARQ-III can be further divided into again two kinds: a kind of is the HARQ-III only with a redundancy versions, each time retransmit redundancy versions all with transmit for the first time identical, what be the format and content of retransmission packet with transmission for the first time is identical, according to signal to noise ratio (SNR) weighted array receiving, these send the copy of grouping to the decoder of receiving terminal, like this, can obtain time diversity gain.Another kind is the HARQ-III with a plurality of redundancy versions, and the redundancy versions of each re-transmission is not identical, and the deletion mode of the redundant bit after coding is through well-designed, and making the code word of deleting is complementary equivalence.Therefore, the code word after merging can cover the bit in FEC coding, and decoding information is become more comprehensively, is more conducive to correct decoding.
At present, III type HARQ is widely used in (as: 3GPP, 3GPP-LTE, WiMAX, 802.16m) in mobile communication standard.The retransmission mechanism of conventional I II type HARQ as shown in Figure 1.
As shown in Figure 1, Frame can be divided into 3 parts, first is information bit, and second portion is the check bit retaining, and third part is to destroy the check bit of (deletion).Meanwhile, in retransmission processes, can take two kinds of different modulation mapping modes.In Fig. 1, adopt " grid " to represent the first mapping mode, adopt " oblique line " to represent the second mapping mode.Here, can adopt multiple different mapping mode, including, but not limited to: 16QAM.For example, 64QAM, 16PSK, 64PSK etc.Fig. 2 shows the first mapping mode based on 16QAM, and Fig. 3 shows the second mapping mode based on 16QAM.
In transmission for the first time, in order to improve transmission code rate, a transmitting terminal transmission information bit part and the check bit part retaining, and the check bit part that adopts the first mapping mode to carry out modulation intelligence bit part and retain.In transmission for the second time, transmitting terminal transmission information bit part and the check bit part of deleting, wherein adopt the second mapping mode to carry out modulation intelligence bit part, adopts above-mentioned the first mapping mode to modulate the check bit part of destroying.
Because the transmission mechanism of traditional III type HARQ is not combined consideration by coding and modulation, so the performance that its secondary retransmits not is very desirable.In addition,, owing to retransmitting the modulation mapping mode that traditional method adopts two kinds for the second time, if the mapping of frame transmitting mistake retransmits and just cannot obtain the mapping mode retransmitting for the second time for the second time, do not know the separation of two kinds of mapping modes simultaneously.
Summary of the invention
Therefore, the present invention is directed to the shortcoming that traditional III type HARQ mechanism exists, by by the high order modulation (as 16QAM) in the ARQ mechanism (III type HARQ) of steadily increase redundancy (IR) and (the Convolutional Turbo Coding) combination of convolution turbo coding, a kind of new retransmission mechanism is proposed.
According to a first aspect of the invention, propose a kind of HARQ repeating method, comprised step:
Utilize check bit that information coding that convolution Turbo encoding method will transmit is information bit, reservation and the check bit part of deletion;
For in the check bit of the information bit that will transmit, reservation and the check bit part of deletion each transmission for the first time and subsequent retransmit for n time, for every twice continuous transmission, adopt respectively different modulation mapping modes to wanting hop to modulate accordingly, and launch modulated signal, wherein n is more than or equal to zero integer.
According to a second aspect of the invention, proposed a kind of transmitter, having comprised:
Convolution Turbo encoder, carries out convolution Turbo coding to information bit, the check bit part of the information bit after being encoded, the check bit of reservation and deletion;
Modulation module, by coding after bit mapping on modulation constellation, the code element after being modulated;
Many antenna transmissions module, by modulation after symbol mapped to a plurality of antennas;
Pilot signal insert module, inserts pilot signal, for use in the channel estimating of receiving terminal in the middle of the code element after modulation;
IFFT conversion module carries out IFFT conversion to be mapped on OFDM subcarrier by the sequence of symhols inserting after pilot tone, and is launched by corresponding antenna;
Wherein, for in the check bit of the information bit that will transmit, reservation and the check bit part of deletion each transmission for the first time and subsequent retransmit for n time, for every twice continuous transmission, adopt respectively different modulation mapping modes to wanting hop to modulate accordingly, and launch modulated signal, wherein n is more than or equal to zero integer.
The performance of transmission mechanism of the present invention is better than traditional III type HARQ transmission mechanism, the robustness while simultaneously having improved transmission.
Accompanying drawing explanation
Fig. 1 shows according to the schematic diagram of HARQ retransmission mechanism of the present invention;
Fig. 2 shows the schematic diagram of the first mapping mode;
Fig. 3 shows the schematic diagram of the second mapping mode;
Fig. 4 shows the overall block-diagram according to transmitter of the present invention;
Fig. 5 shows the structure chart of CTC encoder;
Fig. 6 shows the overall block-diagram according to receiver of the present invention;
Fig. 7 shows according to the structure chart of CTC decoder of the present invention;
Fig. 8 shows according to the schematic diagram of HARQ retransmission mechanism of the present invention;
Fig. 9 show use method of the present invention and art methods Performance Ratio.
Embodiment
The present invention has proposed a kind of IR HARQ transmission method according to CTC Code And Decode characteristic.Below with reference to Fig. 4-8, describe in detail according to the HARQ repeating method based on CTC of the present invention.
First with reference to figure 4 and Fig. 5, the operation according to transmitter of the present invention is described.Fig. 4 shows the block diagram according to transmitter of the present invention.As shown in Figure 4, transmitter can comprise CTC coding module, modulation module, many antenna transmissions processing module, pilot signal insert module, IFFT conversion module and transmitting antenna.Wherein, CTC coding module is for carrying out convolution Turbo coding to information bit, the bit after being encoded.Modulation module by coding after bit mapping on modulation constellation, the code element after being modulated.Many antenna transmissions module to a plurality of antennas, is inserted pilot signal in the middle of the code element of pilot signal insert module after modulation, for use in the channel estimating of receiving terminal by the symbol mapped after modulation.IFFT conversion module carries out IFFT conversion to be mapped on OFDM subcarrier by the sequence of symhols inserting after pilot tone, and is launched by corresponding antenna.
Particularly, Fig. 5 shows the detailed structure view of CTC coding module.Coding module shown in Fig. 5 can comprise 1/3CTC encoder 501, interleaver 502, code element selector 503 and card punch 504 generally.As shown in Figure 5, first input information bits is inputted to 1/3CTC encoder 501.Here, the bit information of exporting after 1/3CTC encoder 501 codings and check bit number are 3 times of information bit.Subsequently, utilize 502 pairs of codings of interleaver after data carry out interleaving treatment.Then card punch 503 punches to the data after interweaving according to required transmission rate, the data bit that selection will send, thereby structural reform code efficiency.Subsequently, utilize modulation module to modulate the data bit that will send, the bit sequence after being encoded, and send the bit sequence after coding.
Particularly, in 1/3CTC encoder 501, adopt duobinary system circular recursion systematic convolutional code (duo binary Circular Recursive Systematic Convolutional code) as its composition code (constituent code).As shown in Figure 5,1/3CTC encoder 401 can comprise CTC interleaver and composition encoder, the information bit that wherein the input A of CTC interleaver and B representative are inputted, and it need to carry out twice coding.First, directly information bit A, B are carried out to duobinary system circular recursion system convolutional encoding, by one group of information bit A
iand B
ibe input in this convolution coder simultaneously and encode, when switch is got to position 1, obtained verification sequence Y
1, W
1.When switch is got to position 2, obtain verification sequence Y
2and W
2.
As shown in Figure 5, interleaver 502 comprises interleaving block and code element selection module.Wherein interleaving block interweaves the bit after coding, rearranges the Bit data position after coding.After interleaver carries out interleaving treatment, the sequence of output is (ABY
1y
2w
1w
2).By code element selector and card punch, this sequence obtaining is processed, code element selector is chosen the starting position of buffer for retransmission operation, and destroy unnecessary check bit, obtain required information bit and the check bit of reservation, to improve code rate.The check bit that obtains information bit and reservation is input to modulation module, to shine upon.
Main improvement of the present invention is the processing of modulation module.According to basic thought of the present invention, in the process of transmission for the first time, because needs improve code check, so W
1w
2deleted, only transmit ABY
1y
2, utilize the first modulation mapping mode (example modulation mapping mode as shown in Figure 2) to modulate it simultaneously.In transmission for the second time, information bit and check digit are all used to the second coded system.In transmission for the third time, adopt the second modulation mapping mode (example modulation mapping mode as shown in Figure 3) different from the first modulation mapping mode to modulate the check bit part of reservation, adopt the first modulation mapping mode to modulate (destroying) check bit part of deletion.
According to the present invention, retransmission mechanism has been followed time diversity thought, also observes balanced principle in the situation that the soft value of decoding merges.Reliability while being bit modulation should be balanced, if for the first time in the high location transmission of modulation reliability, just should modulate the low location transmission of reliability so next time, thereby guarantee that the reliability of all bits after repeatedly transmitting is roughly the same.
Below with reference to Fig. 6 and Fig. 7, the operation according to receiver of the present invention is described.Fig. 6 shows the overall block-diagram according to receiver of the present invention.As shown in Figure 6, receiver can comprise: FFT module, for converting the code element of OFDM to baseband modulation code element; Channel estimation module, removes channel effect by the modulated symbol receiving; Many antenna receptions of MIMO processing module, becomes a data flow by a plurality of data stream mergings of the reception of a plurality of antennas; Demodulation module, for being mapped to Bit data by modulated symbol; CTC decoder module, goes out information bit data stream from the data stream recovery with check bit.
Fig. 7 shows according to the structure chart of CTC decoder of the present invention.
As shown in Figure 7, Y
s(A
k, B
k) represent the information bit that receiving terminal receives, Y
p(A
1k, B
1k) be expressed as the check bit of coding for the first time that receiving terminal receives, lnP
out ex(u
k/ y)
iand lnP
out ex(u
k/ y)
iIbe expressed as the outer probabilistic information output of log-domain information bit of first decoder and second decoder, lnP (u
k/ y)
iand lnP (u
k/ y)
iIbe expressed as the outer probabilistic information input of log-domain information bit of second decoder and first decoder, A
n i(S
n=s), B
0 i(S
0=s) and A
n iI(S
n=s), B
0 iI(S
0=s) be illustrated in initial condition and ending state S
0and S
ninformation bit output while all equaling s, lnP (u
k/ y), the information bit probabilistic information that represents the final output of decoding iteration.
The process of decoding will be described in detail below.First, the soft value of information bit receiving and for the first time check bit of coding are input to first MAP (maximum-likelihood decoding) decoder simultaneously, to carry out decoding.Through decoding, obtain and export probabilistic information outside log-domain information bit.By interleaver, be input to second MAP decoder with the information bit by after interleaver together with the check bit of encoding for the second time, carry out decoding and export the outer probabilistic information of log-domain information bit.By deinterleaver, be input to first MAP decoder.Repeat above-mentioned processing and carry out decoding iteration.After iteration several, export final information bit probability lnP (u
k/ y), obtain the information bit (A after decoding after being input to deinterleaver and hard decision device
k, B
k).
At receiver side, Y
1and W
1check bit is one group, with information bit A input as a MAP decoder together with B, Y
2and W
2check bit is one group, with information bit A input as the 2nd MAP decoder together with B.According to CTC decoding characteristics, wish that the reliability of soft value input of two decoders is more balanced, that is, if the soft value reliability of first decoder input is one high and one low, so just wish that the reliability of soft value of the input of second decoder is one high and one low.In transmission mechanism due to traditional IR HARQ, not utilizing CTC decoding characteristics, is all high and caused the soft value reliability in the input of first decoder, and is all low in the soft value reliability of second decoder input.This causes the performance loss of CTC coding method.
The present invention combines the encoding and decoding characteristic of CTC with modulation.In transmission for the second time, information bit and check digit are all used to the second coded system, thereby overcome the defect of conventional method, improved the performance of system.
Meanwhile, retransmission mechanism of the present invention has been followed time diversity thought, also observes balanced principle when the soft value of decoding merges.Reliability while being bit modulation should be balanced.If for the first time in the high location transmission of modulation reliability, just should modulate the low location transmission of reliability so next time, and guarantee that the reliability of all bits after repeatedly transmitting is roughly the same.The concrete transmission mechanism of the present invention as shown in Figure 8.For example, exemplary method can be described below:
1. transmission for the first time, transmitting terminal transmission information bit part and the check bit part retaining, and the modulation mapping mode of transmission for the first time adopts the first modulation mapping mode (example modulation system as shown in Figure 2);
2. transmission for the second time (retransmitting for the first time), transmitting terminal transmission information bit part and the check bit part of deleting, (destroying) check bit part (example modulation system as shown in Figure 3) that wherein adopts the second modulation mapping mode different from the first modulation mapping mode to carry out modulation intelligence bit part and delete;
3. transmission for the third time (retransmitting for the second time), transmitting terminal adopts the second modulation system partly to modulate the check bit retaining, and adopts the first modulation system partly to modulate the check bit of deleting;
4. the 3n+1 time re-transmission mode is consistent with the mode of transmission for the first time, and the 3n+2 time re-transmission mode is consistent with the mode of transmission for the second time, and the 3n+3 time re-transmission mode is consistent with the mode of transmission for the third time.
In fact, according to principle of the present invention, above example can have multiple variant, as long as for transmitting each time and retransmitting, this transmission has all adopted different modulator approaches with transmitting last time for each in the check bit of information bit, reservation and the check bit of deletion, can solve technical problem of the present invention.That is, take information bit as example, if this transmission utilizes the first modulator approach to modulate information bit,, for the transmission next time of information bit, should adopt different modulation systems.Here should note, with the above-mentioned example that is exemplified as, in first and second transmission, transmitted information bit, and in transmission, there is no transmitted bit for the third time, for the transmission for the third time of information bit (the 4th time whole transmission), adopt the modulation system different with transmission for the second time (transmission for the second time of integral body) for information bit, the like.
As shown in Figure 9, as can be seen from Figure 9, when secondary retransmits, performance of the present invention is better than conventional method to the effect of invention, and when three times retransmit, performance of the present invention is the same with the performance of traditional method.Due in real system, the probability that secondary retransmits is greater than 3 re-transmissions, and because the performance of secondary re-transmission of the present invention is better than traditional secondary re-transmission, so the present invention can save more resource compared with conventional method.
Claims (4)
1. a HARQ repeating method, comprises step:
Utilize check bit that information coding that convolution Turbo encoding method will transmit is information bit, reservation and the check bit part of deletion;
For in the check bit of the information bit that will transmit, reservation and the check bit part of deletion each transmission for the first time and subsequent retransmit for n time, for every twice continuous transmission, adopt respectively different modulation mapping modes to wanting hop to modulate accordingly, and launch modulated signal, wherein n is more than or equal to zero integer;
Wherein, for transmission for the first time, transmitting terminal adopts the first modulation mapping mode to modulate the check bit of the information bit that will transmit and reservation; When needs first retransmit, transmitting terminal adopts the second modulation mapping mode different from the first modulation mapping mode to modulate the check bit of the information bit that will transmit and deletion; When needs second retransmit, transmitting terminal adopts the second modulation system to modulate the check bit of the reservation that will transmit, adopts the first modulation system to modulate the check bit of deleting.
2. method according to claim 1, wherein: in the first modulation mapping mode, at the bit of the high location transmission of reliability, in the second modulation mapping mode, be displaced to the position that reliability is low and transmit.
3. a transmitter, comprising:
Convolution Turbo encoder, carries out convolution Turbo coding to information bit, the check bit part of the information bit after being encoded, the check bit of reservation and deletion;
Modulation module, by coding after bit mapping on modulation constellation, the code element after being modulated;
Many antenna transmissions module, by modulation after symbol mapped to a plurality of antennas;
Pilot signal insert module, inserts pilot signal, for use in the channel estimating of receiving terminal in the middle of the code element after modulation;
IFFT conversion module carries out IFFT conversion to be mapped on OFDM subcarrier by the sequence of symhols inserting after pilot tone, and is launched by corresponding antenna;
Wherein, for in the check bit of the information bit that will transmit, reservation and the check bit part of deletion each transmission for the first time and subsequent retransmit for n time, for every twice continuous transmission, adopt respectively different modulation mapping modes to wanting hop to modulate accordingly, and launch modulated signal, wherein n is more than or equal to zero integer;
Wherein, for transmission for the first time, described modulation module adopts the first modulation mapping mode to modulate the check bit of the information bit that will transmit and reservation; When needs first retransmit, described modulation module adopts the second modulation mapping mode different from the first modulation mapping mode to modulate the check bit of the information bit that will transmit and deletion; When needs second retransmit, described modulation module adopts the second modulation system to modulate the check bit of the reservation that will transmit, adopts the first modulation system to modulate the check bit of deleting.
4. transmitter according to claim 3, is characterized in that: in the first modulation mapping mode, at the bit of the high location transmission of reliability, in the second modulation mapping mode, be displaced to the position that reliability is low and transmit.
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| CN103581091B (en) | 2012-07-31 | 2016-06-08 | 武汉邮电科学研究院 | Launching system and receiving system and transmitting method and reception method |
| WO2018058295A1 (en) * | 2016-09-27 | 2018-04-05 | Qualcomm Incorporated | Hybrid automatic repeat request for block codes |
| CN108076519B (en) * | 2016-11-15 | 2020-05-26 | 上海朗帛通信技术有限公司 | Method and equipment used in low-delay UE and base station |
Citations (4)
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| CN1422021A (en) * | 2001-10-17 | 2003-06-04 | 三星电子株式会社 | Apparatus and method for transmitting/receiving of group retransmission in mobile communication system |
| CN1430362A (en) * | 2001-10-31 | 2003-07-16 | 三星电子株式会社 | Method and transmitting/receiving equipment for group retransmission in mobile communication system |
| CN1433183A (en) * | 2002-01-17 | 2003-07-30 | 杨大成 | Hybrid automatic request retransmission technology |
| CN101291200A (en) * | 2008-06-13 | 2008-10-22 | 中山大学 | Method of hybrid automatic request for retransmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1422021A (en) * | 2001-10-17 | 2003-06-04 | 三星电子株式会社 | Apparatus and method for transmitting/receiving of group retransmission in mobile communication system |
| CN1430362A (en) * | 2001-10-31 | 2003-07-16 | 三星电子株式会社 | Method and transmitting/receiving equipment for group retransmission in mobile communication system |
| CN1433183A (en) * | 2002-01-17 | 2003-07-30 | 杨大成 | Hybrid automatic request retransmission technology |
| CN101291200A (en) * | 2008-06-13 | 2008-10-22 | 中山大学 | Method of hybrid automatic request for retransmission |
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