CN101621355B - System and method for decoding transmission parameter signaling - Google Patents

System and method for decoding transmission parameter signaling Download PDF

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CN101621355B
CN101621355B CN 200910090743 CN200910090743A CN101621355B CN 101621355 B CN101621355 B CN 101621355B CN 200910090743 CN200910090743 CN 200910090743 CN 200910090743 A CN200910090743 A CN 200910090743A CN 101621355 B CN101621355 B CN 101621355B
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tps
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邓周
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Beijing Haier IC Design Co Ltd
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Abstract

The invention relates to a communication system, in particular to a system and a method for decoding a transmission parameter signaling. The method comprises the following steps: performing soft judgment on a TPS symbol according to a constellation demapping unit to obtain TPS soft information; performing smooth processing on the TPS soft information through a smooth processing module; performing correlation value operation on the smoothed TPS soft information and local TPS vector according to a correlation value processing module to obtain the maximum in the correlation value and a local TPS vector sequence number corresponding to the maximum; and locking the local TPS vector sequence number corresponding to the maximum correlation value through the TPS locking module. The system and the method greatly improves the decoding performance of the transmission parameter signaling and the stability of a reception system, effectively reduces unfavorable effect for the decoding accuracy caused by poor channel and strong noise, and can be widely applied to transmission systems in the communication field.

Description

A kind of decode system of transmission parameter signaling and method
Technical field
The present invention relates to the communications field, relate in particular to transmission system and transmission method in the communications field.
Background technology
In communication system in order to adapt to different application; the transmission mode that physical layer often provides plurality of optional to select; and define these parameters such as chnnel coding code check, constellation mapping mode, interleaving mode, protection gap length, OFDM symbol carrier number etc. by one group of parameter.The parameter that determines transmission mode is encoded as transmission parameter signaling (TPS) and transmission, and receiving terminal only has correct reception and the transmission parameter signaling of having decoded just can be finished follow-up solution mediation work decoding.Because transformation parameter has important function, therefore usually it is carried out the coding of highly redundant degree in order to strengthen error correcting capability, thereby and need to repeat to send so that receiver takes relevant art to improve decoding performance at every frame.
In CNS GB 20600-2006 " digital television ground broadcast transmission system frame structure, Channel Coding and Modulation ", transformation parameter mainly comprises symbol constellation mapped mode, LDPC encoder bit rate and interlace mode, obtain transmission parameter signaling and frame mode parameter through spread spectrum coding, this transmission parameter signaling and frame pattern form system information jointly.Except the first frame of each superframe, system information repeats in the fixed position of each signal frame to send.Fig. 1 is the signal frame structure of CNS GB 20600-2006, and this signal frame comprises frame head and frame, and frame head is the PN sequence, and frame comprises system information and data symbol, and wherein system information comprises frame pattern and transmission parameter signaling TPS.
At present existing a plurality of patents have proposed the decoding technique scheme of transmission parameter signaling, are the transmission mode judging method that is applicable to digital TV ground broadcasting transmission such as denomination of invention, and publication number is the Chinese patent of CN1852409A.This patent has proposed a kind of transmission mode judging method that is applicable to digital TV ground broadcasting transmission, before carrying out equilibrium treatment, data flow does the identification of transmission mode, after randomization and Walsh conversion, obtain the absolute value maximum one, and find out its corresponding system information according to pattern-word, tabling look-up draws the transmission mode of Frame.The transformation parameter decoding of this patent need to be carried out before equilibrium, therefore may cause decoding error under the interference of noisy channels and very noisy, and then have a strong impact on the performance of system.And for example denomination of invention is that receiver reaches the method at the frequency domain transmission parameter signaling, and publication number is the Chinese patent of CN101364965A.This patent provides a kind of method of utilizing correlation value calculation to carry out transmission parameter signaling decoding, and this patent emphasis is can obtain corresponding decoded result according to the correlation that the vectorial symmetrical characteristics of TPS only need be calculated half quantity.But under the interference of noisy channels and very noisy, the method for correlation and maximizing of directly calculating is judged by accident possibly, directly affects the performance of receiving system.
In sum, the system and the corresponding implementation method that still have the good decoding performance and have a less hardware configuration under noisy channels and strong noise environment have significant application value.
Summary of the invention
The invention provides a kind of decode system and method for the transmission parameter signaling that can overcome the above problems.
In first aspect, the invention provides a kind of TPS decode system, this system comprises constellation solution map unit, smoothing processing module, correlation processing module, TPS locking module.Wherein, constellation solution map unit is used for the TPS symbol is carried out soft-decision and then obtains the soft information of TPS; The smoothing processing module is used for the soft information of this TPS is done smoothing processing, and then the soft information of TPS after obtaining smoothly; The soft information of TPS and local TPS vector after the correlation processing module will be somebody's turn to do are smoothly done the correlation computing, and obtain maximum and local TPS vector sequence number corresponding to this maximum related value in this correlation; The TPS locking module is used for locking local TPS vector sequence number corresponding to described maximum related value.
In one embodiment of the invention, the smoothing processing module comprises level and smooth arithmetic element, selector and FIFO memory.This level and smooth arithmetic element, selector, FIFO memory are connected successively, and this level and smooth arithmetic element receives the soft information of TPS, the soft information of TPS behind the FIFO memory output smoothing.And the output of this FIFO memory is connected to the input of level and smooth arithmetic element and the input of selector.
In another embodiment of the present invention, the soft information of TPS after level and smooth is:
s i(n)＝αr i(n)+(1-α)s i(n-1)
Wherein, r i(n) be the soft value of information of TPS, α is smoothing factor, s i(n-1) be the TPS soft information of former frame after level and smooth.Getting α when level and smooth initial is higher value, and getting α after the stable state is smaller value.
In yet another embodiment of the present invention, the correlation processing module comprises multiplier, accumulator, latch and the comparator of successively series connection.This accumulator is comprised of adder and delayer, and the soft information of TPS after the multiplier reception smoothly, comparator output maximum related value and corresponding local TPS vector sequence number thereof.And the output of this comparator is connected to an input of this comparator.
In another embodiment of the present invention, the soft information of TPS after level and smooth and the correlation of local TPS vector are:
Y ( j ) = corr ( S , C j ) = Σ i = 1 N s i f ( c j , i )
And
f ( x ) = + 1 , x = 0 - 1 , x = 1
Wherein, S=s 1, s 2... s NBe the soft information of TPS after level and smooth, C=c J, 1, c J, 2... c J, NFor sequence number is the local TPS vector of j, c J, i∈ { 0,1}.
The present invention is by doing the correlation computing to the soft information of the TPS after the smoothing processing and local TPS vector, and obtains local TPS vector sequence number corresponding to maximum related value, obtains transformation parameter by tabling look-up again and then finishes the TPS decoding.System and method of the present invention has improved decoding performance and the receiving system stability of transmission parameter signaling, effectively reduced the adverse effect that noisy channels and very noisy cause the decoding correctness, correlation value calculation and the maximum comparative approach of simultaneously serial have reduced circuit scale effectively, have saved hardware resource.
Description of drawings
Below with reference to accompanying drawings specific embodiments of the present invention is described in detail, in the accompanying drawings:
Fig. 1 is the signal frame structure of CNS GB 20600-2006;
Fig. 2 is the channel equalization module and extracts TPS modular structure figure;
Fig. 3 is TPS decoding circuit structure chart;
Fig. 4 is that the smoothing processing module realizes circuit diagram;
Fig. 5 is correlation processing modules implement circuit diagram;
Fig. 6 is TPS decoding process figure.
Embodiment
Fig. 2 is the channel equalization module and extracts TPS modular structure figure, and the information frame symbol obtains the signal frame after the equilibrium after through channel equalization module 210, and the signal frame after this equilibrium obtains the TPS symbol after extracting TPS module 220.Channel equalization module 210 is used for eliminating interference that data are introduced by channel in order to improve the TPS decoding performance.Extracting TPS module 220 is used for the TPS symbol is extracted from the information frame symbol.
Fig. 3 is TPS decoding circuit structure chart.The effect of constellation solution map unit 310 is that the TPS symbol is carried out soft-decision, obtains the soft information of TPS.Be made as r i(1≤i≤N), wherein N is the bit number of TPS vector.
Smoothing processing module 320 is used for the soft information of TPS is done smoothing processing, and then the soft information of TPS after obtaining smoothly, and the soft information of TPS after will being somebody's turn to do smoothly is sent to correlation processing module 340.The described purpose that the soft information of TPS is carried out smoothing processing is to improve signal to noise ratio.In one embodiment of the invention, through smoothing processing module 320 obtain level and smooth after the soft information of TPS be:
s i(n)＝αr i(n)+(1-α)s i(n-1) (1)
Wherein, r i(n) be the soft information of TPS, α is smoothing factor, s i(n-1) be the TPS soft information of former frame after level and smooth.The less then smooth effect of α value is more obvious, but it is slower to enter stable state.Therefore α is made as higher value level and smooth when initial, in order to can enter fast stable state, adjusts again the α value after the stable state and make it become smaller value in case enter, and then obtain better smooth effect.
The soft information of TPS after level and smooth is equivalent to get the mean value of the soft information of multiframe TPS, because the TPS of every frame transmission is identical, and the desired value of noise is 0, therefore through after the smoothing processing, the signal to noise ratio of TPS decoding circuit significantly improves, and then greatly improves the decoding performance of TPS decoding circuit.
Smoothing processing module 320 can realize that by circuit diagram shown in Figure 4 Fig. 4 is that the smoothing processing module realizes circuit diagram.This smoothing processing module 320 comprises level and smooth arithmetic element 410, selector 420 and FIFO memory 430 (push-up storage).Wherein, level and smooth arithmetic element 410, selector 420, FIFO memory 430 are connected successively; Level and smooth arithmetic element 410 receives the soft information of TPS, the soft information of TPS behind FIFO memory 430 output smoothings; And the output of FIFO memory 430 is connected to the input of level and smooth arithmetic element 410 and the input of selector 420.
The operation principle of smoothing processing module 320 is: selector 420 is selected upper channel or lower channel by control signal; When smoothing processing module 320 received the soft information of TPS, selector 420 was selected the result of level and smooth arithmetic element 410 and it is inputed to FIFO memory 430 (control signal selection lower channel), and the enable signal of juxtaposition FIFO memory 430 is effective; After the soft information of all TPS in 320 receptions of smoothing processing module and the complete frame of buffer memory, in the frame head moment of next frame, read in the lump in this former frame the soft information after level and smooth and it is participated in follow-up correlation value calculation, this moment, selector 420 was connected directly to its input (control signal selection upper channel) with the output of FIFO memory 430, the enable signal of juxtaposition FIFO memory 430 is effective, and then realizes repeatedly circulating and read the purpose of the soft information of TPS.
Among Fig. 3, the local TPS vector of local TPS memory 330 storages.Correlation processing module 340 receives from the level and smooth rear soft information of TPS of smoothing processing module 320 and receives local TPS vector, and the soft information of TPS and local TPS vector after level and smooth to this do the correlation computing, draws maximum related value and the corresponding vectorial sequence number of local TPS thereof again.
The soft information of TPS after supposing smoothly is S=s 1, s 2... s N, the quantification interval is s i∈ [V, V].Sequence number is that the local TPS vector of j is C=c J, 1, c J, 2... c J, NC wherein J, i∈ 0,1}, the soft information of TPS after then level and smooth and the correlation of local TPS vector are:
Y ( j ) = corr ( S , C j ) = Σ i = 1 N s i f ( c j , i ) - - - ( 2 )
Wherein, c J, iBy following formula be mapped as ± 1:
f ( x ) = + 1 , x = 0 - 1 , x = 1 - - - ( 3 )
Fig. 5 is the realization circuit diagram of correlation processing module, and this correlation processing module 340 comprises multiplier 510, accumulator, latch 540 and the comparator 550 of successively series connection, and wherein the accumulator function is realized by adder 520 and delayer 530.At a clock cycle inner multiplication device 510 successively with a bit c of a local TPS vector J, iWith level and smooth after a soft information vector of TPS in a bit s iMultiply each other.Then do cumulative by adder 520 and 530 pairs of these products of delayer.Reading TPS vector C=c J, 1, c J, 2... c J, NFirst bit c J, 1The time, by reset signal delayer is resetted, so that cumulative initial value is 0.Latch 540 is being read vectorial C=c J, 1, c J, 2... c J, NLast bit c J, NAfter latch this accumulated value, this accumulated value be level and smooth after the correlation of the soft information vector of TPS and local TPS vector.Comparator 550 serial received are by some correlations of latch 540 output, and relatively draw maximum in these some correlations and corresponding local TPS vector sequence number thereof.As seen from Figure 5, the comparator 550 in the correlation processing module of the present invention is serial accesses, and this serial comparator has been saved great amount of hardware resources with respect to parallel comparator, has greatly reduced the hardware configuration of TPS decoding circuit.
Among Fig. 3, TPS locking module 350 is used for local TPS vector sequence number corresponding to locking maximum related value, in order to strengthen the stability of TPS decoding circuit.In one embodiment of the invention, lock local TPS vector sequence number corresponding to this maximum related value by confidence counter.Particularly, when the TPS sequence number that the TPS sequence number of obtaining in correlation processing module 340 and former frame are obtained is identical, will puts the letter counting and add 1, otherwise then subtract 1; When putting the letter count value when increasing to predefined lock threshold, latch this TPS sequence number, and the TPS sequence number that will lock exports lookup unit 360 to; When putting the letter count value when being reduced to the losing lock threshold value, remove the TPS sequence number that latchs, relock.By the above locking mechanism, the TPS decoding circuit can be eliminated the impact of bursty interference, and obtains local TPS vector sequence number corresponding to stable maximum related value.
Lookup unit 360 is searched the transformation parameters such as the constellation mapping mode that obtains, LDPC code check, interlace mode according to the local TPS vector sequence number that its maximum related value that receives is corresponding, and then is finished the TPS decoding.
Fig. 6 is TPS decoding process figure.
In step 610, preferably, the information frame symbol is done channel equalization, extract TPS the information frame symbol after channel equalization again, and then obtain the TPS symbol.
In step 620, the TPS symbol is carried out soft-decision, and then obtain the soft information of TPS.
In step 630, the soft information of TPS is done smoothing processing, and then the soft information of TPS after obtaining smoothly.
In one embodiment of the invention, the soft information exchange of TPS after level and smooth is crossed formula (1) and is obtained, and its smoothing factor α is made as higher value level and smooth when initial, is set as smaller value after entering stable state again.
In step 640, the soft information of TPS and local TPS vector after level and smooth are done correlation value calculation, serial compares maximum related value and corresponding local TPS vector sequence number thereof again.
In one embodiment of the invention, the soft information of TPS and local TPS vector correlation value calculating method after level and smooth obtain by formula (2), formula (3).
In step 650, the local TPS vector sequence number that the locking maximum related value is corresponding.
In step 660, tabling look-up according to local TPS vector sequence number corresponding to maximum related value draws transformation parameter, and then finishes the TPS decoding.
Obviously, under the prerequisite that does not depart from true spirit of the present invention and scope, the present invention described here can have many variations.Therefore, the change that all it will be apparent to those skilled in the art that all should be included within the scope that these claims contain.The present invention's scope required for protection is only limited by described claims.

Claims (8)

1. transmission parameter signaling TPS decode system comprises:
Constellation solution map unit (310) is carried out soft-decision and then is obtained the soft information of TPS the TPS symbol; Smoothing processing module (320) is done smoothing processing to the soft information of described TPS, and then the soft information of TPS after obtaining smoothly;
Correlation processing module (340) is done the correlation computing with the described soft information of TPS and local TPS vector after level and smooth, and is obtained maximum and the vectorial sequence number of local TPS corresponding to this maximum related value in this correlation;
TPS locking module (350) is used for locking local TPS vector sequence number corresponding to described maximum related value;
Described smoothing processing module (320) comprises level and smooth arithmetic element (410), selector (420) and FIFO memory (430);
Described level and smooth arithmetic element (410), selector (420), FIFO memory (430) are connected successively, and level and smooth arithmetic element (410) receives the soft information of TPS, the soft information of TPS behind FIFO memory (430) output smoothing;
The output of described FIFO memory (430) is connected to the input of level and smooth arithmetic element (410) and the input of selector (420);
The described soft information of TPS after level and smooth is: s i(n)=α r i(n)+(1-α) s i(n-1), wherein, r i(n) be the soft value of information of TPS, α is smoothing factor, s i(n-1) be the TPS soft information of former frame after level and smooth;
Getting α when level and smooth initial is higher value, and getting α after the stable state is smaller value;
Described correlation processing module (340) comprises multiplier, accumulator, latch and the comparator of successively series connection;
Described accumulator is comprised of adder and delayer, and the soft information of TPS after the multiplier reception smoothly, comparator output maximum related value and corresponding local TPS vector sequence number thereof;
The output of described comparator is connected to an input of this comparator;
Described after level and smooth the soft information of TPS and the correlation of local TPS vector be:
Figure FSB00000901901200011
And
Figure FSB00000901901200021
Wherein, S=s 1, s 2... S NBe the soft information of TPS after level and smooth, C=c J, 1, c J, 2... c J, NFor sequence number is the local TPS vector of j, c J, i∈ { 0,1}.
2. a kind of TPS decode system as claimed in claim 1 is characterized in that, comprising:
Channel equalization module (210) is done channel equalization to its information frame symbol that receives;
Extract TPS module (220), extract TPS the information frame symbol after described channel equalization, and then obtain described TPS symbol.
3. a kind of TPS decode system as claimed in claim 1 is characterized in that described local TPS vector is from local TPS memory (330).
4. a kind of TPS decode system as claimed in claim 1 is characterized in that, described TPS locking module (350) is by local TPS vector sequence number corresponding to confidence counter locking maximum related value.
5. a kind of TPS decode system as claimed in claim 1, it is characterized in that, comprise lookup unit (360), this lookup unit (360) obtains transformation parameter according to local TPS vector sequence number corresponding to its maximum related value that receives, in order to finish the TPS decoding.
6. transmission parameter signaling TPS coding/decoding method comprises:
Step a carries out soft-decision to the TPS symbol, and then obtains the soft information of TPS;
Step b does smoothing processing to the soft information of described TPS, and then the soft information of TPS after obtaining smoothly;
Step c does correlation value calculation to the described soft information of TPS and local TPS vector after level and smooth, obtains maximum and the vectorial sequence number of local TPS corresponding to this maximum related value in this correlation again;
Steps d locks local TPS vector sequence number corresponding to described maximum related value;
The soft information of TPS behind level and smooth among the described step b is:
s i(n)＝αr i(n)+(1-α)s i(n-1)
Wherein, r i(n) be the soft value of information of TPS, α is smoothing factor, s i(n-1) be the TPS soft information of former frame after level and smooth;
Getting α when level and smooth initial is higher value, and getting α after the stable state is smaller value;
Described after level and smooth the soft information of TPS and the correlation of local TPS vector be:
Figure FSB00000901901200022
And
Figure DEST_PATH_FSB00000911655900011
Wherein, S=s 1, s 2... s NBe the soft information of TPS after level and smooth, C=c J, 1, c J, 2... c J, NFor sequence number is the local TPS vector of j, c J, i∈ { 0,1}.
7. a kind of TPS coding/decoding method as claimed in claim 6 is characterized in that, comprises before described step a:
Step e does channel equalization to the information frame symbol, extracts TPS the information frame symbol after channel equalization again, and then obtains described TPS symbol.
8. a kind of TPS coding/decoding method as claimed in claim 6 is characterized in that, comprises after described steps d:
Step f, the local TPS vector sequence number corresponding according to described maximum draws transformation parameter, in order to finish the TPS decoding.
CN 200910090743 2009-08-10 2009-08-10 System and method for decoding transmission parameter signaling Expired - Fee Related CN101621355B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101360083A (en) * 2008-08-22 2009-02-04 凌阳科技股份有限公司 Transmission parameter signaling decoding system for digital terrestrial multimedia broadcast
CN101453637A (en) * 2007-11-30 2009-06-10 Nxp股份有限公司 Reliability detector used for TPS data decoding in digital television

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101453637A (en) * 2007-11-30 2009-06-10 Nxp股份有限公司 Reliability detector used for TPS data decoding in digital television
CN101360083A (en) * 2008-08-22 2009-02-04 凌阳科技股份有限公司 Transmission parameter signaling decoding system for digital terrestrial multimedia broadcast

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