CN100459668C - Device for demodulating system information based on rake receiver, and rake receiver included - Google Patents
Device for demodulating system information based on rake receiver, and rake receiver included Download PDFInfo
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- CN100459668C CN100459668C CNB2006100308982A CN200610030898A CN100459668C CN 100459668 C CN100459668 C CN 100459668C CN B2006100308982 A CNB2006100308982 A CN B2006100308982A CN 200610030898 A CN200610030898 A CN 200610030898A CN 100459668 C CN100459668 C CN 100459668C
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Abstract
The apparatus comprises a separator, a channel estimator, a rake receiver and an information extractor. The separator has two outputs; one of the outputs is connected to the input of the channel estimator, and another one is connected to the input of the rake receiver; another input of the rake receiver is connected to the output of channel estimator; the output of rake receiver is connected to the input of the information extractor. In severe channel condition, the invention can greatly increase the accuracy of system information acquired from demodulation.
Description
Technical field
The present invention relates to signal demodulation field, relate in particular to a kind of in digital tv ground broadcasting, based on the device for demodulating system information of rake receiver.
Background technology
For adopting the user to put the digital television ground broadcast transmission system of broadcast mode, the demodulation correctness of programme information is vital.Transmitting terminal will overlap TV programme more and send simultaneously by certain arranged mode, and receiving terminal is wanted the TV programme sequence number of watching according to the user, and this cover TV programme signal is selected in demodulation from the signal that receives, and could do subsequent treatment to this signal.
Now Chang Yong a kind of method is to distinguish different program groupings on transport stream.Fig. 1 shows MPTS-SPTS (MPTS-SPTS) the program demodulation multiplexer in a kind of digit broadcasting system.The program demodulation multiplexer be input as MPEG-2 MPTS (MPTS) data flow.In program demultiplexing process, earlier to the system information in the transport stream (TS), i.e. PAT, tables such as PMT carry out the filtering analysis.Also be, the PAT (Program Association Table) that at first utilizes Program Association Table (PAT) extractor and analyzer 110 to extract and analyze in the transport stream wraps, export to user interface 160 and Program Map Table (PMT) extractor and analyzer 120 then, thereby extract and analyze among the MPTS PID (program number) with the corresponding PMT of a plurality of programs (Program Map Table).The information that provides according to user interface 160 is provided for PMT filter and selector 130, and Program Map Table is carried out filtering and selection, and provides output to grouping terminator 140.The bag that grouping terminator 140 receives only contains the packet of selected program.At last, utilize Program Association Table (PAT) inserter 150 to reconstruct and the corresponding Program Association Table of the single programs of selecting, obtain in the SPTS after inserting then.
Another kind method is with encoding digital signals, adds necessary supplementary again, as: synchronizing signal, pilot signal, Promgramming information etc.For example: in multicarrier system, as in DVB-T and DMB-T system, the TPS information bit is placed in each OFDM symbol and data-signal is handled together, utilize channel estimating and interpolation to recover this locational value of information, but its precision depend on channel estimated accuracy.
In multicarrier system, in the VSB DTB Digital Terrestrial Broadcasting transmission plan as U.S. ATSC, system information is thick-and-thin.But in new DTB Digital Terrestrial Broadcasting system, system information all might be different at every.Institute's system for transmitting information is different with the data message that is transmitted, and safeguard measures such as system information does not have chnnel coding, interweaves, error correction will reach and the identical error rate of transmission data, and its coding thresholding can be higher.In the single carrier transmitting system of ADTB-T, this method will directly be inserted into every frame beginning in 64 the system information sequences of transmitting terminal behind spread spectrum, after receiving terminal carries out equilibrium, directly carry out relevant with the corresponding data of being received all possible system information sequence, take out a sequence of the absolute value maximum of correlation, just can obtain system information.Referring to Fig. 2, the device for demodulating system information that is used for after the receiving terminal equilibrium has been described.At first, separator receives the signal after the receiving terminal equilibrium, and it is separated and obtains the system information sequence.The system information sequence is provided for relevant despreader 210.Relevant despreader 210 also receives the local system information sequence, and they are carried out relevant despreading with the system information sequence, takes out a sequence of the absolute value maximum of correlation, exports as system information.
This method of utilizing spread spectrum is applicable to the judgement of carrying out system information after the receiving terminal equilibrium.But for adopt the uniformly-spaced transmission system of frequency division multiplexing of Polymera in physical layer, if before balanced, adopt this method of utilizing spread spectrum, under more abominable multipath channel situation, the probability that the system information that obtains is according to the method made mistakes is still bigger.
Summary of the invention
The purpose of this invention is to provide a kind of device that can accurately obtain system information before the receiving terminal equilibrium based on the rake receiver, this device can be reliably, obtain system information exactly under abominable channel circumstance.Device for demodulating system information based on the rake receiver provided by the invention is used in before the receiving terminal equilibrium.By before the receiving terminal equilibrium, carrying out the judgement of system information, improved the correctness of the system information of institute's demodulation greatly than the method that before equilibrium, only adopts spread spectrum.
An aspect of of the present present invention relates to a kind of rake receiver, comprise: m system information coherent detection module, be respectively applied for and utilize a local system information sequence to carry out coherent detection, and the output that will add up accordingly offers one and select module, wherein m is the species number of local system information sequence; Select module, the sequence number of that system information that is used for selecting all output mould value maximums that add up is as output.
Wherein, each of described m system information coherent detection module comprises again: (L-1) the unit time delay register of individual cascade, wherein first unit time delay register receives the conjugate of corresponding local system information sequence, described conjugate is delayed time successively through each unit time delay register, (L-1) is provided respectively individual delayed output, wherein L is the system information sequence length, and L is more than or equal to m; First group of L multiplier, wherein the conjugate of first multiplier first tap of self-channel estimator in the future multiplies each other with conjugate without the local system information sequence of time-delay, the output of first multiplier is provided, all the other multipliers in the future the self-channel estimators follow-up corresponding tap conjugate respectively with corresponding (L-1) individual delayed output multiplication, corresponding multiplier output is provided; Second group of L multiplier is used for the corresponding output of described first group of L multiplier and the system information sequence that receives are multiplied each other in n data constantly, and corresponding L multiplier output is provided; And an accumulator, be used for L multiplication output of described second group of L multiplier is added up, and will add up and be input to described selection module.Wherein L is 2 integral number power, and power is inferior to 6.In a preferred embodiment, L equals 128, and m equals 24.
Another aspect of the present invention relates to a kind of device for demodulating system information, comprising: separator is used for received signal is separated into system information sequence and time domain known array; Channel estimator is used to from the time domain known array of described separator channel response be done rough estimate, and corresponding values of tap is provided; And rake receiver as claimed in claim 1, be used to receive from the system information sequence of described separator and from the values of tap of described channel estimator, they are carried out coherent detection and output system information sequence number.Described device for demodulating system information also comprises: information extractor, be used to receive system information sequence number from the rake receiver, and the system message list that reference is known is also exported corresponding information.Described channel estimator can adopt correlation peak detection, utilize the channel estimation method of time-domain training sequence and in the adaptive equalization algorithm any one.
Another aspect of the present invention relates to a kind of rake receiver, comprise: m system information coherent detection module, be respectively applied for and utilize a local system information sequence to carry out coherent detection, and the output that will add up accordingly offers one and selects module, and wherein m is the species number of local system information sequence; Select module, the sequence number of that system information that is used for selecting all output mould value maximums that add up is as output.Wherein, each of described m system information coherent detection module comprises again: (L-1) the unit time delay register of individual cascade, wherein first unit time delay register receives the conjugate of corresponding system information sequence, described conjugate is delayed time successively through each unit time delay register, (L-1) is provided respectively individual delayed output, wherein L is the system information sequence length, and L is more than or equal to m; First accumulator is used for respective taps conjugate and corresponding delayed local system information sequence from channel estimator are added up; A multiplier is used for the output of first accumulator and the system information sequence that receives are multiplied each other in n data constantly, and multiplication output is provided; And second accumulator, be used for described multiplication output is added up, and to selecting module that the output that adds up is provided.Wherein, L is 2 integral number power, and power is inferior to 6.In a preferred embodiment, L equals 128, and m equals 24.
Of the present inventionly relate in one aspect to a kind of device for demodulating system information again, comprising: separator is used for received signal is separated into system information sequence and time domain known array; Channel estimator is used to from the time domain known array of described separator channel response be done rough estimate, and corresponding values of tap is provided; And rake receiver as claimed in claim 5, be used to receive from the system information sequence of described separator and from the values of tap of described channel estimator, they are carried out coherent detection and output system information.Described device for demodulating system information also comprises: information extractor, be used to receive system information from the rake receiver, and the system message list that reference is known is also exported corresponding information.Described channel estimator can adopt correlation peak detection, utilize the channel estimation method of time-domain training sequence and in the adaptive equalization algorithm any one, also can adopt the related data that obtains from real channel response generator.
For receiver, the correctness of system information is the prerequisite of subsequent treatment.The system information sequence is owing to passed through channel, before the receiving terminal equilibrium, if directly method its correctness under abominable multipath channel of doing coherent detection with all possible system information sequence and receiving sequence is difficult to guarantee, the present invention adopts the rake receiver to collect from the signal energy in main received signal path, be equivalent to a maximal ratio combiner, thereby guaranteed to detect the correctness of the system information that obtains.This correctness that can improve system information based on the device of rake receiver greatly of the present invention.
Description of drawings
Fig. 1 illustrates MPTS-SPTS (MPTS-SPTS) separator 100 in a kind of digit broadcasting system.
Fig. 2 illustrates the block diagram of the device for demodulating system information in the ADTB-T single-carrier digital television terrestrial broadcast system.
Fig. 3 illustrates the block diagram according to the demodulating equipment 300 of the system information based on the rake receiver of the present invention.
Fig. 4 illustrates the structured flowchart according to rake receiver of the present invention.
Fig. 4 a illustrates the structured flowchart according to a kind of channel estimator of the present invention.
Fig. 5 illustrates the simplified structure block diagram according to rake receiver of the present invention.
Embodiment
Hereinafter with preferred embodiments of the present invention will be described in detail with reference to the annexed drawings.
Fig. 3 shows the demodulating equipment 300 according to the system information based on the rake receiver of the present invention.
As shown in Figure 3, this device 300 comprises separator 310, channel estimator 320, rake receiver 330 and information extractor 340.Wherein, separator 310 separates from received signal and obtains time domain known array and system information sequence, and offers channel estimator 320 and rake receiver 330 respectively.Channel estimator 320 utilizes time domain known array to channel time domain response carrying out channel rough estimate, and the rough estimate of the channel time domain that obtains response is output to an input of rake receiver 330.Channel estimation method can be correlation peak detection, utilize in the algorithm of the channel estimation method of time-domain training sequence, adaptive equalization any one, also the data that can obtain being correlated with from real channel response generator should adopt the less channel estimation method of a kind of complexity in principle.For example, a kind of method of carrying out the channel rough estimate in channel estimator 320 is, utilizes the known PN time domain sequences of each frame head, does relevant with local pure PN sequence, thereby set thresholding removal background noise again and obtain the bigger multipath of amplitude, so just output obtains channel time domain response rough estimate c
0(n), c
1(n) ..., c
L-1(n).Rake receiver 330 receives from the system information sequence of separator 310 with from the channel estimating information of channel estimator 320, long channel time domain for L responds the rough estimate evaluation as L values of tap, and the system information sequence that receives is carried out coherent detection to obtain system information accurately.At transmitting terminal, the system information sequence can be obtained by the system information spread spectrum, for example, 24 kinds of system informations is arranged, and can be represented that the system information of this 7 bit can spread to 128 (2 by 7 bits
7) the system information sequence of bit, utilize two sequence of levels of 128 bits to express the system information sequence of this 128 bit, each sequence adopts the walsh sequence to take advantage of the PN sequence to obtain, promptly get 128 * 128 Walsh matrix each row 128 numbers and (PN[127],-1) multiplies each other respectively and get preceding 24 row and can constitute 24 system information sequences, wherein 1,0 in the PN sequence has been mapped as 1 ,-1 respectively, and such system information can obtain 128/7 spreading gain.The system information of rake receiver 330 output is provided for information extractor 340, is used for the system information that detects according to rake receiver 330, with reference to known system message list, exports corresponding information to carry out follow-up processing, for example equilibrium etc.
Fig. 4 a illustrates the structured flowchart of a kind of channel estimator 320 of the present invention.Channel estimator 320 comprises M register 321, an accumulator 322 and a gate 323, and M is that time domain known array is the length of PN sequence, and M is more than or equal to L.Wherein, y
n((i)
M), y
n((i+1)
M) ..., y
n((i+M-1)
M) be the time domain known array that separator 310 separates output through channel, ()
MIt is surplus that expression with M is that the end gets, and i is more than or equal to zero integer less than L; PN[0], PN[1] ..., PN[M-1] be local known PN sequence through mapping, its value is 1 or-1; c
i(n) be i channel tap value of channel estimator 320 outputs.In channel estimator 320, separator 310 separates the time domain known array through channel of output and puts into M register 321 successively, local known PN sequence PN[0], PN[1] ..., PN[M-1] as coefficient, value in this M register is added up, for example, if PN[j] be 1, the value in the former accumulator 322 adds y
n((i+j)
M), if PN[j] be-1, the value in the former accumulator 322 deducts y
n((i+j)
M), value in this M register is being added up afterwards accumulated value input threshold device 323, accumulator 322 zero clearings simultaneously, in gate 323, if input is less than setting thresholding, output zero is if input is more than or equal to setting thresholding, directly export input value, the output of gate 323 is i channel tap c
i(n); Value in M the register is carried out cyclic shift, repeat aforesaid operations up to obtaining L channel tap c
0(n), c
1(n) ..., c
L-1(n).
Fig. 4 illustrates the structured flowchart according to rake receiver 330 of the present invention.Rake receiver 330 comprises that (L-1) * m unit time delay register 410, first group of L * m multiplier 420, second group of L * m multiplier 430, a m accumulator 440 and one select module 450, wherein m is the species number of local system information sequence, and L is the system information sequence length.Wherein, s
L1(n), s
L2(n) ..., s
Lm(n) be that local m system information sequence is in the n data in the moment; s
L1 *(n), s
L2 *(n) ..., s
Lm *(n) be respectively s
L1(n), s
L2(n) ..., s
Lm(n) conjugate; c
0(n), c
1(n) ..., c
L-1(n) be the channel time domain response values of tap of channel estimator 320 outputs; c
0 *(n), c
1 *(n) ..., c
L-1 *(n) be respectively c
0(n), c
1(n) ..., c
L-1(n) conjugate; r
l(n) be that separator 310 separates the system information sequence of output in n data constantly; U
1, U
2..., U
mBe the output of each accumulator 440, also promptly input to the judgment variables of the coherent detection of selecting module 450.In rake receiver 330, for each of m the system information sequence of this locality, for example for first kind of system information sequence s
L1(n), at the conjugate s of n data constantly
L1 *(n) (L-1) the individual unit time delay register 410 through cascade postpones to be placed in the register after the unit successively; First multiplier in first group of L multiplier 420 is with system information sequence s
L1(n) conjugate s
L1 *(n) with the conjugate c of first tap
0 *(n) multiply each other, the output of first multiplier in first group of L multiplier 420 is provided.All the other multipliers in first group of L multiplier 420 respectively with the output of corresponding unit time delay register respectively with corresponding tap conjugate c
1 *(n) ..., c
L-1 *(n) multiply each other, the output of all the other multipliers in first group of L multiplier is provided.Second group of L multiplier 430 is with each output of first group of L multiplier 420 and that r of this system information sequence that is input to rake receiver 330 constantly
l(n) multiply each other, their output all is provided for accumulator 440.Wherein, r
l(n) be the separator 310 system information sequences that need demodulation output, that promptly receive, r
l(n) be s
l(n) a certain system information sequence that obtains through reception after the channel distortions in.The output of 440 pairs of second group of L multipliers 430 of accumulator adds up, and output U will add up
1Offer and select module 450.It below only is operation for first kind of system information sequence in m the system information sequence of this locality.All the other the 2nd are also operated accordingly to m kind system information sequence, and output U is accordingly added up
2..., U
m, also offer and select module 450.Select module 450 to be used for selecting the sequence number of that system signal of all output mould value maximums that add up as output.For example, if add up output U
kMould value maximum, then selecting k is that system information is exported.Then, the system information k that the information extractor 340 among Fig. 3 detects according to rake receiver 330 again with reference to known system message list, exports corresponding information.
In the device according to the demodulating system information based on the rake receiver of the present invention, the length L of system information sequence is that spread spectrum length is 2 power, and power is the integer more than or equal to 6.The species number m of system information sequence is greater than zero, smaller or equal to the integer of the length L of system information sequence.If the every bit of local system information sequence all is 1 or-1, so in rake receiver 330, the all possible system information sequence in this locality and channel time domain response values of tap is done relevant this of convolution to be gone on foot used multiplier 420 and can omit, (2 * L * m) reduces to the product of species number m of the length L of system information sequence and system information sequence, and (L * m), this situation no longer illustrates the number of multiplier by the product of the species number m of the length L of the system information sequence of twice and system information sequence.If again by the commutative operation order, promptly multiply each other in multiplier with that of the system information sequence that receives that this is input to rake receiver 330 constantly more earlier through accumulator, the number of multiplier can further be reduced to the species number m of system information sequence so, and this situation is with shown in Figure 5.
Fig. 5 shows the simplified structure block diagram according to rake receiver 330 of the present invention.Rake receiver 330 comprises (L-1) * m unit time delay register 410, a m multiplier 460, m first accumulator 440, m second accumulator 470 and a selection module 450.In the rake receiver of simplifying 330, for each of m the system information sequence of this locality, for example for first kind of system information sequence s
L1(n), at the conjugate s of n data constantly
L1 *(n) (L-1) the individual unit time delay register 410 through cascade postpones to be placed in the register after the unit successively; Corresponding delayed s
L1 *(n) as coefficient, to the tap conjugate c that generates by the channel estimator among Fig. 3 320
0 *(n), c
1 *(n) ..., c
L-1 *(n) in first accumulator 440, add up.Wherein, at each constantly, local m kind system information sequence is the unit's of process time delay register 410 successively, data are 0,1 or-1 in the unit time delay register 410, if 0, then the value in first accumulator 440 is constant, if-1, then the last value in first accumulator 440 deducts value of gripping altogether of channel response tap, if 1, then the last value in first accumulator 440 adds value of gripping altogether of channel response tap.The output of first accumulator 440 is input to an input of multiplier 460, and this is input to a certain position r of the system information sequence of rake receiver 330 constantly
l(n) be input to another output of multiplier 460.460 pairs of two inputs of multiplier are multiplied each other and are provided and export second accumulator 470 to.Second accumulator 470 is with last data addition in the data of multiplier 460 output and this accumulator, and the output U that will add up
1Offer and select module 450.It below only is operation for first kind of system information sequence in m the system information sequence of this locality.All the other the 2nd are also operated accordingly to m kind system information sequence, and output U is accordingly added up
2..., U
m, also offer and select module 450.Select module 450 to be used for selecting the sequence number of system information of all output mould value maximums that add up as output.For example, if add up output U
kMould value maximum, then selecting k is that system information is exported.Then, the system information sequence number k that the information extractor 340 among Fig. 3 detects according to rake receiver 330 again with reference to known system message list, exports corresponding information.
According to the present invention, by using the rake receiver, can before the receiving terminal equilibrium, do coherent detection to system information sequence through spread spectrum, strengthened the detection correctness of system information under abominable multipath channel greatly.
Although described the preferred embodiments of the present invention, it should be appreciated by those skilled in the art that to the invention is not restricted to above preferred embodiment.Define at appended claims under the situation of ground the spirit and scope of the present invention, can make various changes and modification.
Claims (12)
1. rake receiver comprises:
M system information coherent detection module is respectively applied for and utilizes a local system information sequence to carry out coherent detection, and the output that will add up accordingly offers one and select module, and wherein m is the species number of local system information sequence;
Select module, the sequence number of that system information that is used for selecting all output mould value maximums that add up is as output;
Wherein, each of described m system information coherent detection module comprises again:
(L-1) the unit time delay register of individual cascade, wherein first unit time delay register receives the conjugate of corresponding local system information sequence, described conjugate is delayed time successively through each unit time delay register, (L-1) is provided respectively individual delayed output, wherein L is the system information sequence length, and L is more than or equal to m;
First group of L multiplier, wherein the conjugate of first multiplier first tap of self-channel estimator in the future multiplies each other with conjugate without the local system information sequence of time-delay, the output of first multiplier is provided, all the other multipliers in the future the self-channel estimators follow-up corresponding tap conjugate respectively with corresponding (L-1) individual delayed output multiplication, corresponding multiplier output is provided;
Second group of L multiplier is used for the corresponding output of described first group of L multiplier and the system information sequence that receives are multiplied each other in n data constantly, and corresponding L multiplier output is provided; And
An accumulator is used for L multiplication output of described second group of L multiplier is added up, and will add up and be input to described selection module.
2. rake receiver as claimed in claim 1 is characterized in that, described L is 2 integral number power, and power is inferior to 6.
3. rake receiver as claimed in claim 2 is characterized in that described L equals 128, and m equals 24.
4. device for demodulating system information comprises:
Separator is used for received signal is separated into system information sequence and time domain known array;
Channel estimator is used to from the time domain known array of described separator channel response be done rough estimate, and corresponding values of tap is provided; And
Rake receiver as claimed in claim 1 is used to receive from the system information sequence of described separator and from the values of tap of described channel estimator, and they are carried out coherent detection and output system information sequence number.
5. device for demodulating system information as claimed in claim 4 is characterized in that also comprising:
Information extractor is used to receive the system information sequence number from the rake receiver, and the system message list that reference is known is also exported corresponding information.
6. device for demodulating system information as claimed in claim 4 is characterized in that, described channel estimator can adopt correlation peak detection, utilize the channel estimation method of time-domain training sequence and in the adaptive equalization algorithm any one.
7. rake receiver comprises:
M system information coherent detection module is respectively applied for and utilizes a local system information sequence to carry out coherent detection, and the output that will add up accordingly offers one and select module, and wherein m is the species number of local system information sequence;
Select module, the sequence number of that system information that is used for selecting all output mould value maximums that add up is as output;
Wherein, each of described m system information coherent detection module comprises again:
(L-1) the unit time delay register of individual cascade, wherein first unit time delay register receives the conjugate of corresponding system information sequence, described conjugate is delayed time successively through each unit time delay register, (L-1) is provided respectively individual delayed output, wherein L is the system information sequence length, and L is more than or equal to m;
First accumulator is used for respective taps conjugate and corresponding delayed local system information sequence from channel estimator are added up;
A multiplier is used for the output of first accumulator and the system information sequence that receives are multiplied each other in n data constantly, and multiplication output is provided; And
Second accumulator is used for described multiplication output is added up, and to selecting module that the output that adds up is provided.
8. rake receiver as claimed in claim 7 is characterized in that, described L is 2 integral number power, and power is inferior to 6.
9. rake receiver as claimed in claim 8 is characterized in that described L equals 128, and m equals 24.
10. device for demodulating system information comprises:
Separator is used for received signal is separated into system information sequence and time domain known array;
Channel estimator is used to from the time domain known array of described separator channel response be done rough estimate, and corresponding values of tap is provided; And
Rake receiver as claimed in claim 5 is used to receive from the system information sequence of described separator and from the values of tap of described channel estimator, and they are carried out coherent detection and output system information.
11. device for demodulating system information as claimed in claim 10 is characterized in that also comprising:
Information extractor is used to receive the system information from the rake receiver, and the system message list that reference is known is also exported corresponding information.
12. device for demodulating system information as claimed in claim 10, it is characterized in that, described channel estimator can adopt correlation peak detection, utilize the channel estimation method of time-domain training sequence and in the adaptive equalization algorithm any one, also can adopt the related data that obtains from real channel response generator.
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| CN102684740B (en) * | 2011-03-07 | 2014-04-02 | 清华大学 | High-speed low-complexity PAKE receiver and implementation method of high-speed low-complexity PAKE receiver |
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| CN1384682A (en) * | 2001-05-03 | 2002-12-11 | Lg电子株式会社 | Receiver for mobile communication system |
| CN1561006A (en) * | 2004-03-02 | 2005-01-05 | 北京邮电大学 | Correlated receiver and signal receiving method for super-broad band radio communication system |
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| CN1384682A (en) * | 2001-05-03 | 2002-12-11 | Lg电子株式会社 | Receiver for mobile communication system |
| CN1561006A (en) * | 2004-03-02 | 2005-01-05 | 北京邮电大学 | Correlated receiver and signal receiving method for super-broad band radio communication system |
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