CN101605116A - Constructive method, reconstructing circular convolution method and the device at frame structure protection interval - Google Patents
Constructive method, reconstructing circular convolution method and the device at frame structure protection interval Download PDFInfo
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- CN101605116A CN101605116A CNA200810043458XA CN200810043458A CN101605116A CN 101605116 A CN101605116 A CN 101605116A CN A200810043458X A CNA200810043458X A CN A200810043458XA CN 200810043458 A CN200810043458 A CN 200810043458A CN 101605116 A CN101605116 A CN 101605116A
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Abstract
The invention discloses the constructive method at frame structure protection interval in a kind of radio communication emission system; generating the original state of the linear feedback shift register at the continuous frame protection interval of present frame circulation, is last state that generates the linear feedback shift register at the continuous protection interval of former frame circulation.The invention also discloses reconstruct channel and emission information data cyclic convolution method and device.From receive data r, intercept respectively the desired data sequence r in the continuous protection interval of present frame circulation
1, the whole information data sequence r behind the continuous protection interval of present frame circulation
2, the continuous protection interval of next frame circulation begins length for estimating the receiving data sequence r of maximum delay expansion
3To calculate behind three data sequence alignments that obtain, obtain the channel of reconstruct and the cyclic convolution of emission information data.The present invention can reduce the complexity of computing, can obtain the higher degree of accuracy again.
Description
Technical field
The present invention relates to the transmission of wireless signals field, particularly relate to the constructive method at frame structure protection interval in a kind of radio communication emission system; The invention still further relates to reconstruct channel and emission information data cyclic convolution method and device in the corresponding receiving system in a kind of and described frame structure protection interval.
Background technology
At the autonomous national standard of digital terrestrial broadcasting of releasing of China---in system's (DTMB Digital Terrestrial Multimedia Broadcasting digital ground multimedia broadcast) of digital ground multimedia broadcast, transmitting terminal has adopted with the time domain of cycle P N sequence and has filled as protection time-domain synchronization OFDM technology (TDS-OFDM) at interval.Because cycle P N sequence is that receiving terminal is known, PN protection interval can be used for rapid system synchronously and channel estimating.
Important function has been brought into play in the PN protection at interval, but it can partly produce interference to information data under multi-path environment.To carry out at the cyclic convolution of receiving terminal reconstruct channel and information data frequency domain and process, just PN must be protected the interference at interval to remove.The method of disturbing at the removal PN protection interval that receiving terminal adopts usually is: obtain earlier the time domain shock response of channel by channel estimation module; the PN sequence that receiving terminal is known and time domain channel carry out linear convolution and obtain the interference that caused by this PN protection interval then, deduct at last this part interference from the data-signal of receiving.Because the interference at PN protection interval is present in head and the afterbody of information data section simultaneously, so need to carry out 2 sublinear convolution, the channel maximum delay expansion L that the length of each linear convolution is equivalent to estimate.When L is big, bigger computational complexity is still arranged even adopt the DFT fast algorithm to carry out linear convolution.And the method for this interference removal depends on the accuracy of channel estimating.
Summary of the invention
The technical problem to be solved in the present invention provides the constructive method at frame structure protection interval in a kind of radio communication emission system, can reduce the complexity of computing, can obtain the higher degree of accuracy again, and mutually independent with channel estimating, and hardware is realized simple; The present invention also will provide reconstruct channel and emission information data cyclic convolution method and device in the corresponding receiving system in a kind of and described frame structure protection interval for this reason.
For solving the problems of the technologies described above, the constructive method at frame structure protection interval is in the radio communication emission system of the present invention:
Generate the original state of the linear feedback shift register at the continuous frame protection interval of present frame circulation; be last state that generates the linear feedback shift register at the continuous protection interval of former frame circulation, the length at the protection interval that described circulation is continuous is chosen in the following formula scope:
Protection length≤two Cycle Lengths of M sequence at interval that M sequence one-period length＜circulation is continuous.
The continuous protection of described circulation is spaced apart the PN protection interval in the DTMB emission system; its length is in the following formula scope; the length at M sequence one-period length＜PN protection interval≤two Cycle Lengths of M sequence, according to the system counter maximum delay expansion require with superframe in the frame number of different initial phases choose.
Of the present invention corresponding to reconstruct channel in the receiving system at above-mentioned frame structure protection interval and emission information data cyclic convolution method, comprise the steps:
Step 1, the desired data sequence r from receive data r in the continuous protection interval of intercepting present frame circulation
1
Step 2, the whole information data sequence r from receive data r behind the continuous protection interval of intercepting present frame circulation
2
Step 3, the continuous protection interval of intercepting next frame circulation begins length for estimating the receiving data sequence r of maximum delay expansion from receive data r
3
Be calculated as follows behind step 4, three the data sequence alignments that above-mentioned steps is obtained:
r
c＝r
2+r
3-r
1
Eliminate PN protection interval and disturb, obtain the channel of reconstruct and the cyclic convolution r of emission information data
c
Of the present invention corresponding to reconstruct channel in the receiving system at above-mentioned frame structure protection interval and emission information data cyclic convolution device, comprising:
The front end receiver module is used for data receiver, and described data comprise protection interval and the information data that circulation is continuous;
The protection interval interception module that circulates continuous is connected with described front end receiver module, and the length that intercepts from the data that receive in the continuous protection interval of present frame circulation is to estimate the desired data sequence r of maximum delay expansion
1
The information data interception module is connected with described front end receiver module, the whole information data sequence r from the data that receive behind the continuous protection interval of intercepting present frame circulation
2, sequence length is determined by the length of the information data between the continuous protection interval of two frames circulation before and after the emission system;
Hangover information data interception module is connected with described front end receiver module, and the continuous protection interval of intercepting next frame circulation begins length for estimating the receiving data sequence r of maximum delay expansion from receive data
3
The protection interval interference cancellation module that circulates continuous, protection interval interception module, information data interception module and the be connected information data interception module continuous with circulation are connected, and will align from the data sequence of above-mentioned three modules, and press following formula computing r
c=r
2+ r
3-r
1, eliminated the interference that circulates the protection interval continuous and cause, obtain the channel of reconstruct and the cyclic convolution r of emission information data
c
The reconstructing method of information data and channel cyclic convolution in the constructive method at frame structure protection interval and the corresponding receiving system in the radio communication emission system of the present invention; can greatly reduce and remove the computational complexity that disturb at PN protection interval in the receiving system; and mutually independent with channel estimating, than the conventional method of the employing linear convolution that depends on channel estimation results the higher degree of accuracy is arranged.And this reconstructing circular convolution method not only is applicable to the improvement frame structure protection interval D TMB system that the present invention proposes, if before and after the frame protection to be spaced apart the system of circulation continuous sequence all applicable; Only need corresponding PN protection interval location is replaced with the position of concrete circulation continuous sequence.Concrete circulation continuous sequence can require and the cycle period decision according to sequence length.For example can be on the basis of sequence [1-11], producing length is 4, cycle period is 3 circulation continuous sequence a1=[1-111], a2=[-111-1], a3=[11-11] as the protection interval.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment:
Fig. 1 is the formation schematic diagram at frame structure protection interval in the embodiments of the invention DTMB emission system;
Fig. 2 is the structure drawing of device that embodiments of the invention are realized information data and channel reconstructing circular convolution;
Fig. 3 is the method for operation schematic diagram of three data interception modules among Fig. 2.
Embodiment
Below will be that protection is spaced apart embodiment the present invention is described in detail as PN for 8 M sequence with the exponent number N of a cyclic extensions.Certainly, be that the M sequence of other value is equally suitable for exponent number N.What should be specifically noted that is that the constant value of parameter described in the literary composition only is the description of example for convenience of implementation, never is used for the restriction invention.
After having determined the exponent number of cyclic extensions M sequence, choosing of PN protection gap length K can be selected by channel maximum delay expansion L on the estimation, and the channel maximum delay expansion L that the more big system of K can resist is more big.Simultaneously because this protection is the cyclic extensions of N (N=8 in this example) rank M sequence at interval, the length K that requires it is greater than the length of M sequence one-period but be no more than the M sequence length in two cycles, and promptly 2
N-1＜K≤2* (2
N-1).Fig. 1 provided 8 rank M sequence cycles expand continuously the back length K be respectively 420 (referring to Fig. 1 a) and the protection of 510 (referring to Fig. 1 b) constructive method at interval, pi among the figure, i=1 ..., 255, represent each symbol in the 8 rank M sequence one-periods.Can see that from Fig. 1 the protection interval of the length K that this method consists of=420 also has the preamble of adopting in the PN420 pattern in the DTMB standard and adds a M sequence period PN and add rear synchronous protection spacer structure a); And have the periodic continuously frame of some when K=420, the initial phase at each frame protection interval is different, can realize the function of the frame identifier of each signal frame in the DTMB superframe.
Certainly protection gap length K is not limited to 420 and 510, to protecting gap length K, 2 arbitrarily
N-1＜K≤2* (2
N-1); as long as the PN protection of front and back two frames has following feature at interval; all be suitable for PN protection of the present invention constructive method at interval, this feature is: the initial condition that generates present frame PN protection LFSR at interval is last state that generates former frame PN protection LFSR at interval.The PN of two frames protection interval is made up of the continuous wave output of a LFSR namely, is circulation and continuously expansion by the M sequence of this LFSR generation.
For the emission system that has adopted frame structure protection of the present invention interval constructive method to realize, the receiving system corresponding with it is suitable for information data of the present invention and channel reconstructing circular convolution method.With 8 rank M sequence cycles continuously the length K of expansion be that 420 PN protection is spaced apart embodiment, further the present invention is described in detail.What should be specifically noted that is; information data of the present invention and channel reconstructing circular convolution method not only are applicable to the frame structure protection interval D TMB system that the present invention proposes; as long as it is all applicable that front and back frame protection is spaced apart the system of circulation continuous sequence, only need PN protection interval location in the method is replaced with the position of concrete circulation continuous sequence.
As shown in Figure 2, for receiving terminal, the front end receiver module is used to receive the data of receiving, these data comprise PN protection interval and information data.
PN protection interval interception module is the required sequence r of intercepting from the present frame PN protection interval that receives
1, sequence length is for estimating maximum delay expansion L, take L=165 as example.The method of intercepting is that the position from protection end, interval M sequence period length (if transmitting terminal is the ordinary cycle continuous sequence, then length is the cycle period length of this sequence) begins from present frame PN protection interval, intercepts the sequence that a segment length is L.For present embodiment, from protect the position of end 255 length at interval from PN420, intercepted length is 165 protection intervening sequence, as shown in Figure 3.If the PN that is intercepted protection intervening sequence is r
1(i), i=1 .., 165.
The information data interception module intercepts the whole information data sequence r behind the present frame protection interval from receive data
2, sequence length is the frame information data length between the two frame PN protection interval before and after the emission system, take frame length as 3780 as example.Intercept method is all data sequences between the intercepting front and back two frame PN protection interval from receive data, as shown in Figure 3.If the information data sequence that is intercepted is r
2(i), i=1 .., 3780.
Hangover information data interception module intercepts the sequence r that comprises the information data hangover that is caused by multipath from receive data
3, sequence length is for estimating maximum delay expansion L, take L=165 as example.The method of intercepting is front L the symbol sebolic addressing that intercepting next frame PN protection interval begins from receive data, i.e. front 165 symbol sebolic addressings of next frame, as shown in Figure 3.If the hangover information data sequence that is intercepted is r
3(i), i=1 ..., 165.
PN protection interval interference cancellation module, the sequence r that protects the interval interception module to obtain PN
1, the sequence r that obtains of information data interception module
2The sequence r that obtains with hangover information data interception module
3, simply add and subtract arithmetical operation, eliminate the interference that PN protection interval causes, obtain the reconstructing circular convolution of channel and emission information data.Concrete computational methods are: with r
1And r
3The afterbody zero filling is extended to and r
2Isometric sequence, and calculate r
2+ r
3-r
1, obtain a length and be 3780 new sequence; Be equivalent to and use r
3-r
1To length 3780 information data sequence r
2Preceding 165 data revise.This new sequence is the channel of reconstruct and the cyclic convolution of emission information data, can be directly used in frequency domain and process.
More than be that example has been described in detail the present invention with the DTMB emission system, this is not in order to restriction the present invention.That adopts PN420 and PN945 pattern in the complete compatible DTMB standard in protection interval that method of the present invention consists of contains preamble and rear synchronous protection interval; and can realize that equally each signal frame frame head employing out of phase PN is as the function of signal frame identifier in the superframe in the DTMB standard, just the concrete PN initial phase of each signal frame employing is different from the DTMB standard.All any modifications of within principle of the present invention and spirit, doing, be equal to and replace and improvement etc., all should be included within the protection of the present invention.
Claims (7)
1, the constructive method at frame structure protection interval in a kind of radio communication emission system; it is characterized in that: the original state that generates the linear feedback shift register at the continuous frame protection interval of present frame circulation; be last state that generates the linear feedback shift register at the continuous protection interval of former frame circulation, the length at the protection interval that described circulation is continuous is chosen in the following formula scope:
Protection length≤two Cycle Lengths of M sequence at interval that M sequence one-period length＜circulation is continuous.
2, the constructive method at frame structure protection interval in the radio communication emission system as claimed in claim 1 is characterized in that: the continuous protection of described circulation is spaced apart the PN protection interval in the DTMB emission system, its length in the following formula scope,
The length at M sequence one-period length＜PN protection interval≤two Cycle Lengths of M sequence, according to the system counter maximum delay expansion require with superframe in the frame number of different initial phases choose.
3, a kind of corresponding to reconstruct channel in the claim 1 frame structure protection receiving system at interval and emission information data circular convolution method, it is characterized in that: comprise the steps:
Step 1, the desired data sequence r from receive data r in the continuous protection interval of intercepting present frame circulation
1
Step 2, the whole information data sequence r from receive data r behind the continuous protection interval of intercepting present frame circulation
2
Step 3, the continuous protection interval of intercepting next frame circulation begins length for estimating the receiving data sequence r of maximum delay expansion from receive data r
3
Be calculated as follows behind step 4, three the data sequence alignments that above-mentioned steps is obtained:
r
c＝r
2+r
3-r
1
Eliminate PN protection interval and disturb, obtain the channel of reconstruct and the cyclic convolution r of emission information data
c
4, reconstruct channel as claimed in claim 3 and emission information data circular convolution method; it is characterized in that: the concrete grammar of the described desired data sequence intercepting of step 1 is; from circulating continuous protection at interval, the present frame that receives intercepts a segment length for estimating maximum delay expanded data sequence; the original position of this data sequence is arranged in the continuous protection of present frame circulation at interval from the position of end, protection interval M sequence period length, promptly from protecting end 2 at interval
N-1 position, wherein, N is the exponent number of M sequence.
5, such as claim 3 or 4 described reconstruct channels and emission information data cyclic convolution method, it is characterized in that: the continuous protection of described circulation is spaced apart the PN protection interval in the DTMB emission system.
6, a kind of device of realizing the described method of claim 3 is characterized in that, comprising:
The front end receiver module is used for data receiver, and described data comprise protection interval and the information data that circulation is continuous;
The protection interval interception module that circulates continuous is connected with described front end receiver module, and the length that intercepts from the data that receive in the continuous protection interval of present frame circulation is to estimate the desired data sequence r of maximum delay expansion
1
The information data interception module is connected with described front end receiver module, the whole information data sequence r from the data that receive behind the continuous protection interval of intercepting present frame circulation
2, sequence length is determined by the length of the information data between the continuous protection interval of two frames circulation before and after the emission system;
Hangover information data interception module is connected with described front end receiver module, and the continuous protection interval of intercepting next frame circulation begins length for estimating the receiving data sequence r of maximum delay expansion from receive data
3
The protection interval interference cancellation module that circulates continuous, protection interval interception module, information data interception module and the be connected information data interception module continuous with circulation are connected, and will align from the data sequence of above-mentioned three modules, and press following formula computing r
c=r
2+ r
3-r
1, eliminated the interference that circulates the protection interval continuous and cause, obtain the channel of reconstruct and the cyclic convolution r of emission information data
c
7, device as claimed in claim 6 is characterized in that: the continuous protection of described circulation is spaced apart the PN protection interval in the DTMB emission system.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101764622B (en) * | 2010-01-19 | 2013-06-05 | 清华大学 | Parallel multicode-rate convolutional code decoding method and realization device thereof |
| WO2015032084A1 (en) * | 2013-09-09 | 2015-03-12 | 华为技术有限公司 | Data receiving method and receiver |
| CN110073329A (en) * | 2016-12-16 | 2019-07-30 | 华为技术有限公司 | Memory access equipment calculates equipment and the equipment applied to convolutional neural networks operation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1787507B (en) * | 2004-12-10 | 2010-04-28 | 清华大学 | Method for producing frame synchronizing in time domain synchronizing orthogonal frequency division multiplex system |
| CN101035295A (en) * | 2007-04-16 | 2007-09-12 | 北京航空航天大学 | Frame-synchronization generation method and its device in the ground digital TV system |
-
2008
- 2008-06-10 CN CN200810043458XA patent/CN101605116B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101764622B (en) * | 2010-01-19 | 2013-06-05 | 清华大学 | Parallel multicode-rate convolutional code decoding method and realization device thereof |
| WO2015032084A1 (en) * | 2013-09-09 | 2015-03-12 | 华为技术有限公司 | Data receiving method and receiver |
| US9712366B2 (en) | 2013-09-09 | 2017-07-18 | Huawei Technologies Co., Ltd. | Data receiving method and receiver |
| CN110073329A (en) * | 2016-12-16 | 2019-07-30 | 华为技术有限公司 | Memory access equipment calculates equipment and the equipment applied to convolutional neural networks operation |
| CN110073329B (en) * | 2016-12-16 | 2021-06-22 | 华为技术有限公司 | Memory access device, computing device and device applied to convolutional neural network operation |
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Owner name: MAIKESHENG TECHNOLOGY (HONGKONG) CO., LTD. Free format text: FORMER OWNER: MAXSCEND TECHNOLOGIES (SHANGHAI) INC. Effective date: 20150206 |
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Effective date of registration: 20150206 Address after: Room 16llB, 16 / F, good view business centre, 2-16 Garden Street, Kowloon Mong, Hongkong Special Administrative Region, China Patentee after: Mike Sheng Technology (Hongkong) Co., Ltd. Address before: 201203, room 3000, building 5, Zhangjiang port, Zhangjiang East Road, Pudong New Area,, Shanghai Patentee before: Maxscend Technologies Inc. |