CN101060382A - A multiple time slot joint coding method - Google Patents
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Abstract
The related multi-time-slot combined coding method comprises: on the time-slot structure, coding data; adjusting the coding rate; interlacing former data; and mapping the physical layer time-slot, wherein the coding process enhances coding performance as the code length increases. This invention improves data transmission rate at new time slot efficiently.
Description
Technical field
The present invention relates to communication technique field, relate in particular to a kind of multiple time slot joint coding method.
Background technology
Under the ever-increasing situation of business, GSM (global system for mobile communications)/EDGE (GSM strengthens speed evolution) network more and more is subjected to the restriction of capacity and speed, each GSM/EDGE evolution technology continues to bring out for this reason, to improve user's peak rate and Mean Speed.
In order to improve the upstream and downstream user message transmission rate, one of present method is that a plurality of traditional time slots are combined into new time slot, and only keeps a training sequence in new time slot.Fig. 1, Fig. 2 show the structure of traditional time slot and the structure of time slot after the combination of M time slot respectively.
Among Fig. 2, M represents traditional number of time slots that new time slot comprises.For traditional time slot, each time slot comprises 156.25 symbols, and the symbolic number that can be used for transfer of data is 116 symbols, and for the new time slot of being made up of M traditional time slot, its symbolic number that can be used for transfer of data is 156 symbols of 116+ (M-1) *; If two time slot combinations, the symbolic number that so new time slot can be used for transfer of data is 272; If three time slot combinations, the symbolic number that so new time slot can be used for transfer of data is 428.
Under present new time slot, the physical layer channel code scheme generally adopts the coded system under the conventional physical time slot, i.e. the convolution coding mode.The coded system schematic diagram of data as shown in Figure 3 under the tradition structure of time slot.The symbolic number that each traditional time slot can be used for transfer of data is 116, so the symbolic number that 4 time slots can transmit data altogether is 464.For the modulation of the GMSK among the GSM/EDGE, the corresponding bit of each symbol is so transmission data bit number is 464 bits; For the 8PSK modulation, corresponding 3 bits of each symbol are so the transmission data bit is 1392.The digital coding business of existing GSM/EDGE is divided into nine kinds according to different modulation systems and code rate, and called after MCS1 is to MCS9.Wherein MCS1-MCS4 adopts the GMSK modulation, thus these 4 kinds of type of codings can with the physical layer bit number be 456 bits; MCS5-MCS9 adopts the 8PSK modulation, thus these 5 kinds of type of codings can with the physical layer bit number be 1392.
The error correction coding type that is adopted among the MCS1-MCS9 is a convolution code, and the purpose of error correction coding is to improve the reliability of communication control processor decoding, and code rate is low more, and the reliability of decoding is good more, but the valid data transmission rate descends.
According to the code rate difference, Packet data service EGPRS is divided into nine big class types of service at present, MCS1-MCS9, and its coding schematic diagram such as Fig. 4 are to shown in Figure 7.
Coding flow process with MCS1-4 among Fig. 4 is that example describes below: whole coding divides two parts, and the one, frame head coding, the 2nd, frame data coding.Wherein:
RLC/MAC Head is exactly data before the frame head coding, and HCS is the CRC check bit of frame head, is added in by the frame head back of verification, in order to error detection.RLC/MAC adds that carrying out convolutional encoding behind the HCS has obtained frame head data behind the coding of CodedHead length, then to 80 bits that punch of frame head behind the coding of this CodedHead length.
Data is frame data before the coding, and BCS is the CRC check bit of frame data, is added in by the frame data back of verification, and in order to the fast error detection of data, the bit that makes zero when TB is convolution coding makes coder state make zero.After Data adds BCS and TB, carry out convolutional encoding and obtain frame data behind the coding of CodedData length, then to 372 bits that punch of frame data behind the coding of this CodedData length.
Head and 372 Bit datas to back 80 bits of encoding interweave at last, add SB (stealing the frame bit) and ESB (expand and steal the frame bit) bit then and are mapped on the time slot (burst) of physical layer.
The coding flow process of MCS5-9 is similar, just some difference aspect data block length, interleave depth or data block number.Such as the last coded data length of MCS5-6 is 1248, and the last coded data length of MCS7-9 is 612; But MCS7-9 frame data coding comprises two data blocks.In addition, all be 4 as the digital coding interleave depth of MCS1-7, just frame data piece when interweaving can be dispersed on 4 physical layer time slots (burst) and transmit; And the coding depth of MCS8-9 has only 2.
Wherein MCS1-MCS9 physical layer encodes parameter sees the following form:
| EGPRS Type | Hlen | HCS | Coded Head | Dlen | BCS | TB | Coded Data | SB | ESB | MapBit | Inter Depth |
| MCS1 MCS2 MCS3 MCS4 MCS5 MCS6 MCS7 MCS8 MCS9 | 31 31 31 31 37 37 46 46 46 | 8 8 8 8 8 8 8 8 8 | 80 80 80 80 136 136 160 160 160 | 178 226 298 354 450 594 450 546 594 | 12 12 12 12 12 12 12 12 12 | 6 6 6 6 6 6 6 6 6 | 372 372 372 372 1248 1248 612 612 612 | 8 8 8 8 8 8 8 8 8 | 4 4 4 4 0 0 0 0 0 | 464 464 464 464 1392 1392 1392 1392 1392 | 4 4 4 4 4 4 4 2 2 |
Concerning a channel coding device, code rate R is defined as follows:
R=input significant bit/reality output bit,
The code rate of above-mentioned 9 kinds of type of codings is regulated by punching.The present unified 1/3 code check convolutional encoding that adopts during the MCS1-MCS9 coding also just says that N bit of every input just exported 3*N bit to regard to this encoder for convolution codes.The output of encoder for convolution codes is sent to the input of perforating device, if the bit number of destroying is Δ N, the encoding rate of the cascade unit of this convolutional encoding+punching is N/ (3*N-Δ N) so, can correct decoding in order to guarantee receiver, and code rate can not be greater than 1.
Data bit after above-mentioned coding+punching carries out discretization through interleaver, and its discrete principle is with separating that original adjacent bit is tried one's best.Its objective is the burst error discretization in the radio communication, thus the antiburst error and the bursty interference ability of enhancing receiver.
Carry out the physical layer mapping after the discrete processes, its effect is that the bit of interleaver output is inserted corresponding physical layer time slot.This data block just is distributed in first time slot of continuous 4 physical frames, totally 4 time slots.Because each physical frame comprises 8 time slots, so 4 continuous frames can transmit 8 such data blocks.
Because only kept a training sequence in the time slot structure,, cause the receiver data demodulates error rate to increase so under the time slot structure, the channel estimating of IA High Speed Channel and the performance of tracking can descend to some extent.If still adopt the convolution coding mode under the new time slot, cause the data frame error rate height of data frame error rate the most at last than traditional time slot, the gain of the message transmission rate that so new time slot provides will be balanced out by too high frame error rate.
In addition, under the time slot structure, because the bit number that each time slot can transmit increases, so also the coded data block length than traditional is big as the length of each data block among Fig. 8, type of coding for the phase same rate, if all adopt identical convolutional encoding, the Block Error Rate of the big more data block of data block length also can increase thereupon so.
Summary of the invention
The object of the present invention is to provide a kind of multiple time slot joint coding method, solved time slot combination back because the problem that the data frame error rate that the data demodulates decreased performance causes is too high and the data block Block Error Rate increases.
The objective of the invention is to be achieved through the following technical solutions:
A kind of multiple time slot joint coding method comprises:
In the structure of time slot of multiple time slot joint, data to be encoded are carried out encoding process;
Data bit behind the coding is punched and regulates code rate;
Data bit after the punching is carried out interleaving treatment;
Data bit after above-mentioned interweaving is carried out the physical layer time slot mapping;
Described encoding process process, employing is encoded to data to be encoded with the coding method of the increase coding efficiency enhancing of code length.
Coding under the described multiple time slot joint comprises the coding of frame head, frame data and other information overhead, and the described coding method that strengthens with the increase coding efficiency of code length is only encoded to frame data.
Described method further comprises:
Frame head is adopted convolutional coding method.
The described coding method that strengthens with the increase coding efficiency of code length comprises: Turbo code or low density parity check code LDPC.
The son coding multinomial of described Turbo code is the multinomial that Wideband Code Division Multiple Access (WCDMA) WCDMA physical layer protocol TS25.212 generates.
Structure of time slot behind the described multiple time slot joint is for only keeping the new time slot of a training sequence.
Described method further comprises:
Before encoding, the CRC check position of increase frame head length, stealing frame number of bits and/or data segment.
Described method is applicable to: NBxMCS1-11, wherein x is the time slot number of combinations.
As seen from the above technical solution provided by the invention, the present invention is by using the coding method that coding efficiency strengthens along with the increase of code length, solve the problem that demodulation performance descends and the data block Block Error Rate increases under the traditional coded system in multi-slot combination back, effectively guaranteed the raising of message transmission rate under the new time slot.
Description of drawings
Fig. 1 is prior art conventional physical structure of time slot figure;
Fig. 2 is the time slot structure figure after prior art is made up by M traditional time slot;
Fig. 3 is a prior art tradition time slot physical layer data coding schematic diagram;
Fig. 4 is prior art MCS1-4 coding schematic diagram;
Fig. 5 is prior art MCS5-6 coding schematic diagram;
Fig. 6 is prior art MCS7 coding schematic diagram;
Fig. 7 is prior art MCS8-9 coding schematic diagram;
Fig. 8 adopts physical layer data coding schematic diagram behind the time slot structure for prior art;
Fig. 9 is a kind of embodiment of the method for the invention schematic diagram of encoding;
Figure 10 is a kind of embodiment operational flowchart of the method for the invention;
Figure 11 is the method for the invention NB2MCS1-4 coding schematic diagram;
Figure 12 is the method for the invention NB2MCS5-6 coding schematic diagram;
Figure 13 is the method for the invention NB2MCS7 coding schematic diagram;
Figure 14 is the method for the invention NB2MCS8-11 coding schematic diagram.
Embodiment
Core concept of the present invention provides a kind of multiple time slot joint coding method, on the basis of multi-slot combination, introduce the interpretation method that decoding performance improves along with the increase of code length, remedied the too high defective of frame error rate that multi-slot combination back data demodulates decreased performance causes.
The invention provides a kind of multiple time slot joint coding method, present embodiment adopts the frame data after the coded system of Turbo code makes up multi-slot to encode, and present embodiment is encoded schematic diagram as shown in Figure 9, and operating process comprises as shown in figure 10:
Step 1: after the new time slot combination, the frame data employing Turbo code of carrying is encoded, adopt convolutional encoding to handle to frame head;
Suppose d
0, d
1... .d
N-1Be source data bit to be encoded, d
0, p
0 1, p
0 2, d
1, p
1 1, p
1 2... .d
N-1, p
N-1 1, p
N-1 2Be the coding output of Turbo code, present embodiment is an example with 1/3 encoding rate, so systematic bits d of every output
iJust follow two check bit p
i 1, p
i 2
The son coding multinomial of Turbo code can be selected WCDMA physical layer protocol TS25.212 generator polynomial for use, also can select the multinomial of other types.
Coding under the new time slot comprises the coding of frame head, frame data and other information overhead equally.Because the data length of frame head and other information overhead is shorter, be not suitable for adopting Turbo code, so the multiple time slot joint coding only adopts the Turbo coding to frame data among the present invention, the coding of frame head and other information overhead still can adopt existing GSM EDGE coded system.
The superior performance gonosome of Turbo code is long code coding at random now, so input block is long more, the decoding performance of Turbo code is good more.
Step 2: the data bit behind the coding is punched, to adjust code rate;
For the type of coding of odd encoder speed is provided, need regulate code rate by the number of punching bit.The punching mechanism of Turbo code at first needs Turbo code coding output carrying out bit sequence is separated, and is about to the sequence d among Figure 10
0, p
0 1, p
0 2, d
1, p
1 1, p
1 2... .d
N-1, p
N-1 1, p
N-1 2Separate, divide three columns according to output, i.e. d
0, d
1... d
N-1p
0 1, p
1 1... p
N-1 1p
0 2, p
1 2... p
N-1 2, respectively this three columns certificate to be punched then, punching is output in order.Output bit after the punching is e
0, e
1... .e
3N-1-Δ NWherein Δ N is the bit number that needs punching, so the total encoding rate in coding punching back is
Described Δ N can select corresponding punching bit number according to the system data transmission rate request, as long as guarantee that total encoding rate is between [1/3,1], so Δ N value between [0,2N].
Step 3: the data bit after will punching carries out interleaving treatment, with its discretization, in order to strengthen the antiburst error and the anti-bursty interference ability of receiver;
In Fig. 9, the bit of the back output that interweaves is e
0', e
1' ... .e '
3N-1-Δ N
Punching in the multiple time slot joint coding, interleaving scheme is a lot, can select and designs according to message transmission rate and performance requirement in the practical operation.
Step 4: the data bit after above-mentioned interweaving is carried out the physical layer time slot mapping, and the data bit after being about to interweave is inserted in the corresponding physical layer time slot.
New time slot with two time slots combinations is the process that the example explanation is encoded to MCS1-4 according to the method described above below, its cataloged procedure as shown in figure 11, detailed process is as described below:
Whole cataloged procedure divides two parts, and the one, the frame head coding; The 2nd, the frame data coding.
RLC/MAC Head is exactly data before the frame head coding, and HCS is the CRC check bit of frame head, is added in by the frame head back of verification, in order to error detection.RLC/MAC adds that carrying out convolutional encoding behind the HCS has obtained frame head data behind the coding of CodedHead length, then to 160 bits that punch of frame head behind the coding of this CodedHead length.In order to satisfy the increase of time slot combination back frame head expense, frame head length can suitably increase.HCS is constant, still is 8 bits.
Data is frame data before the coding, and BCS is the CRC check bit of frame data, is added in by the frame data back of verification, and in order to the fast error detection of data, the bit that makes zero when TB is the Turbo code coding makes Turbo code sub-encoders state make zero.After Data adds BCS and TB, carry out obtaining behind the Turbo code coding frame data behind the coding of CodedData length, then to 908 bits that punch of frame data behind the coding of this CodedData length.Because upper layer data is that unit issues with the byte, so frame data coding input bit number must be 8 multiple.Herein, the frame data check digit increases to 16 bits by 12 original bits, can satisfy the increase along with frame data length, the raising that the frame data error detecing capability requires.In order to keep the compatibility with existing upper layer data packet length, the data block length of part encoding scheme frame data should be the integral multiple of existing coding input block length.
Head and 908 Bit datas to back 160 bits of encoding interweave at last, add SB then and the ESB bit is mapped on the new physical layer time slot.In order to distinguish coding method of the present invention and traditional type of coding, and support some functions that coding method of the present invention possesses, the SB bit can be increased to 16 bits from 8 original bits.
The employing such scheme can be realized the coding to MCS10 and MCS11.The coding flow process of NB2MCS5-11 (NB represents new time slot, 2 expression number of time slots) is respectively as Figure 12, Figure 13, shown in Figure 14, and the difference of itself and MCS1-4 is some difference aspect data block length, interleave depth or data block number.Such as the last coded data length of NB2MCS5-6 is 3048, and the last coded data length of NB2MCS7-9 is 1504; But NBS2MCS7-11 frame data coding comprises two data blocks.In addition, the data segment code interleaving degree of depth of NB2MCS1-7 all is 4, that is to say that frame data piece when interweaving can be dispersed on 4 physical layer time slots to transmit; And the digital coding degree of depth of NB2MCS8-11 has only 2.
Top embodiment is encoded to example with Turbo, and all encoding scheme such as LDPC (low density parity check code) that coding efficiency strengthens with the increase of code length can realize the present invention in the practical operation.
In sum, the present invention has solved the problem that demodulation performance descends under the traditional coded system in multi-slot combination back by using the coding method that coding efficiency strengthens along with the increase of code length, has effectively guaranteed the raising of message transmission rate under the new time slot.Simultaneously, newly-increased two kinds of encoding scheme NBxMCS10 and NBxMCS11 can increase the density of the division of code rate grade, thereby make the self adaptation better effects if of coding.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (8)
1, a kind of multiple time slot joint coding method comprises:
In the structure of time slot of multiple time slot joint, data to be encoded are carried out encoding process;
Data bit behind the coding is punched and regulates code rate;
Data bit after the punching is carried out interleaving treatment;
Data bit after above-mentioned interweaving is carried out the physical layer time slot mapping;
It is characterized in that, described encoding process process, employing is encoded to data to be encoded with the coding method of the increase coding efficiency enhancing of code length.
2, a kind of multiple time slot joint coding method as claimed in claim 1, it is characterized in that, coding under the described multiple time slot joint comprises the coding of frame head, frame data and other information overhead, and the described coding method that strengthens with the increase coding efficiency of code length is only encoded to frame data.
3, a kind of multiple time slot joint coding method as claimed in claim 2 is characterized in that, described method further comprises:
Frame head is adopted convolutional coding method.
As claim 1,2 or 3 described a kind of multiple time slot joint coding methods, it is characterized in that 4, the described coding method that strengthens with the increase coding efficiency of code length comprises: Turbo code or low density parity check code LDPC.
5, a kind of multiple time slot joint coding method as claimed in claim 4 is characterized in that, the son coding multinomial of described Turbo code is the multinomial that Wideband Code Division Multiple Access (WCDMA) WCDMA physical layer protocol TS25.212 generates.
6, a kind of multiple time slot joint coding method as claimed in claim 1 is characterized in that, the structure of time slot behind the described multiple time slot joint is for only keeping the new time slot of a training sequence.
7, a kind of multiple time slot joint coding method as claimed in claim 1 is characterized in that, described method further comprises:
Before encoding, the CRC check position of increase frame head length, stealing frame number of bits and/or data segment.
8, a kind of multiple time slot joint coding method as claimed in claim 1 is characterized in that, described method is applicable to: NBxMCS1-11, wherein x is the time slot number of combinations.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012071715A1 (en) * | 2010-12-01 | 2012-06-07 | Zte (Usa) Inc. | System and method for improving receiver sensitivity of a dd-ofdm system without using frequency guard band |
| CN102932094A (en) * | 2011-08-12 | 2013-02-13 | 华为技术有限公司 | Method and device for sending information |
| CN106464780A (en) * | 2013-10-03 | 2017-02-22 | 特拉华大学 | Xslit camera |
| CN108234068A (en) * | 2016-12-15 | 2018-06-29 | 华为技术有限公司 | Transmit the method and its equipment of low density parity check code |
| CN111371711A (en) * | 2020-03-16 | 2020-07-03 | 天津津航计算技术研究所 | Fast acquisition and synchronization method of wireless burst communication system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100557177B1 (en) * | 1998-04-04 | 2006-07-21 | 삼성전자주식회사 | Adaptive Channel Code / Decoding Method and Its Code / Decoding Device |
| AU768016B2 (en) * | 2000-07-05 | 2003-11-27 | Lg Electronics Inc. | Method of configuring transmission in mobile communication system |
| KR100520159B1 (en) * | 2003-11-12 | 2005-10-10 | 삼성전자주식회사 | Apparatus and method for interference cancellation of ofdm system using multiple antenna |
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2006
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012071715A1 (en) * | 2010-12-01 | 2012-06-07 | Zte (Usa) Inc. | System and method for improving receiver sensitivity of a dd-ofdm system without using frequency guard band |
| US8897645B2 (en) | 2010-12-01 | 2014-11-25 | Zte (Usa) Inc. | System and method for improving receiver sensitivity of a DD-OFDM system without using frequency guard band |
| CN102932094A (en) * | 2011-08-12 | 2013-02-13 | 华为技术有限公司 | Method and device for sending information |
| CN102932094B (en) * | 2011-08-12 | 2016-08-10 | 华为技术有限公司 | The method and apparatus of transmission information |
| CN106464780A (en) * | 2013-10-03 | 2017-02-22 | 特拉华大学 | Xslit camera |
| CN106464780B (en) * | 2013-10-03 | 2019-06-21 | 特拉华大学 | XSLIT camera |
| US10546395B2 (en) | 2013-10-03 | 2020-01-28 | University Of Delaware | XSlit camera |
| CN108234068A (en) * | 2016-12-15 | 2018-06-29 | 华为技术有限公司 | Transmit the method and its equipment of low density parity check code |
| CN111371711A (en) * | 2020-03-16 | 2020-07-03 | 天津津航计算技术研究所 | Fast acquisition and synchronization method of wireless burst communication system |
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