CN101237302A - A system information decoding method and device - Google Patents

Abstract

The invention relates to a decoding method for system information and equipment. The method is characterized in that: a special combination of four paths is decoded to obtain corresponding four-path system information and a locking indication; and a special combination of the four-path system information and the locking indication is selected to obtain system information, a locking indication and an inversed connection indication of an I/Q branch. By fusing the single carrier mode system information decoding and the multi-carrier mode system information decoding and judging the inversed connection of the data of the I and Q branches, the decoding method and the equipment ensure that the system information decoding result can be quickly obtained under the unknown carrier mode and the inversed connection of the I and Q branches, and enhance the adaptability and the response ability of a receiver.

Description

A kind of system information coding/decoding method and equipment

Technical field

The present invention relates to a kind of system information coding/decoding method and equipment, relate in particular to a kind of Digital Television Terrestrial Broadcasting system for transmitting information decoding method and equipment of being applicable to.

Background technology

In digital-communications transmission system, at dissimilar business, can adopt different transmission modes, comprise parameters such as sign map mode, channel coding method, interleaving mode, above-mentioned parameter is referred to as system information.Transmission mode has determined receiver to processing method of data.If to the transmission mode judging mistake, receiver can't correctly be worked.

Transmission mode is encoded to the system information vector usually, to strengthen the antijamming capability in the transmission course.For example in CNS GB 20600-2006 " digital television ground broadcast transmission system frame structure, chnnel coding and modulation " (hereinafter to be referred as GB), signal frame is made up of PN sequence, system information and data.Wherein system information obtains by coding and spread spectrum, has comprised information such as symbol constellation mapped mode, LDPC encoder bit rate, interlace mode, can represent 64 kinds of transmission modes at most.After having determined transmission mode, will in each signal frame, comprise identical system information (except first frame of each superframe, it comprises the first frame indication information of superframe).

In Chinese patent CN 101106690A " utilizing system information to realize the method for automatic mode identification " and CN 1852409A " being applicable to the transmission mode judging method of Digital Television Terrestrial Broadcasting transmission ", a kind of transmission mode judging method that is applicable to the Digital Television Terrestrial Broadcasting transmission is disclosed.This method is carried out pattern recognition to the reception data before balanced, obtains information such as modulating mode, interlace mode, LDPC encoder bit rate, just system information is decoded.This method stresses to have illustrated the data characteristics according to system information vector itself, tries to achieve system information pattern matching result's method by randomization and Walsh conversion etc.

In such scheme, in order to eliminate the harmful effect that equalizer brings pattern discrimination, the system information decoding was carried out before equilibrium.But, when the channel multi-path interference is very strong, may cause the erroneous judgement of transmission mode.And the burst noise that often exists in the channel disturbs the erroneous judgement that also can cause transmission mode, thereby the system information that makes decoding obtain is incorrect and unstable.In addition, such scheme is not considered receiver I, the special circumstances when Q props up the circuit-switched data reversal connection in the system information decode procedure.

Therefore, need a kind of system information coding/decoding method and equipment, it is by to the fusion of single and multi-carrier modular system information decoding with I, Q are propped up the judgement of circuit-switched data reversal connection, can guarantee that at carrier mode unknown and I, Q prop up circuit-switched data and connect and inverse time can obtain the system information decoded result fast, can judge in the system information decode procedure so whether I, Q branch road connect instead, and still can determine transmission mode.

Summary of the invention

The object of the present invention is to provide a kind of system information coding/decoding method and equipment that can overcome the above problems.

In first aspect, the invention provides a kind of system information coding/decoding method, it is characterized in that: the particular combinations to following four tunnel system information symbol input is decoded, wherein, the input of first via system information symbol is the single-carrier system information symbol input of extracting from balanced output data frame, and input is decoded and drawn first via system information and first via locking indication to first via system information symbol; The second tunnel system information symbol input is the I/Q reversal connection extracting from the time domain equalization output data frame and the real part imaginary part is exchanged, and input is decoded and drawn the second tunnel system information and the second tunnel locking indication to the second tunnel system information symbol; The input of Third Road system information symbol is the multicarrier system information symbol input of extracting from balanced output data frame, and input is decoded and drawn Third Road system information and Third Road locking indication to the Third Road system information symbol; The input of the four tunnel system information symbol is the multicarrier system information symbol input of extracting the I/Q reversal connection that then the real part imaginary part is exchanged from balanced output data frame, and input is decoded and drawn the four tunnel system information and the four tunnel locking indication to the four tunnel system information symbol; And above-mentioned four tunnel system informations and the particular combinations of locking indication are selected to draw system information, locking indication and the reversal connection of I/Q branch road indicate.

In second aspect, the invention provides a kind of system information decoding device, it is characterized in that: the particular combinations that comprises following four branch roads, wherein, first branch road comprises, first abstraction module is used for extracting the input of single-carrier system information symbol to import as first via system information symbol from balanced output data frame, the first fundamental system information decoding module, being used for first via system information symbol input decoded draws first via system information and first via locking indication; Second branch road comprises, first abstraction module, be used for extracting the input of single-carrier system information symbol from balanced output data frame, the first real part imaginary part Switching Module, be used for the described single-carrier system information symbol input of extracting from balanced output data frame is carried out the exchange of real part imaginary part to import as the second tunnel system information symbol, the second fundamental system information decoding module, being used for the second tunnel system information symbol input decoded draws the second tunnel system information and the second tunnel locking indication; The 3rd branch road comprises, second abstraction module, be used for extracting the input of multicarrier system information symbol to import as the Third Road system information symbol from balanced output data frame, the 3rd fundamental system information decoding module, being used for Third Road system information symbol input decoded draws Third Road system information and Third Road locking indication; The 4th branch road comprises, the 3rd abstraction module, be used for extracting the input of multicarrier system information symbol from balanced output data frame, the second real part imaginary part Switching Module, be used for the described multicarrier system information symbol input of extracting from balanced output data frame is carried out the exchange of real part imaginary part to import as the four tunnel system information symbol, the 4th fundamental system information decoding module, being used for the four tunnel system information symbol input decoded draws the four tunnel system information and the four tunnel locking indication; And moderator, be used for the particular combinations of above-mentioned four tunnel system informations and locking indication is selected to draw system information, locking indication and I/Q branch road reversal connection indication.

The present invention is by to the fusion of single and multi-carrier modular system information decoding with I, Q are propped up the judgement of circuit-switched data reversal connection, guaranteed that at carrier mode unknown and I, Q prop up circuit-switched data and connect and inverse time can obtain the system information decoded result fast, strengthened the adaptability and the responding ability of receiver.

In an embodiment of first aspect present invention, decoding step comprises: the system information symbol input is separated be mapped as bit; Carry out pattern matching with separating bit after the mapping and each vector in the system information vector table, draw matching result; When satisfying predetermined condition, lock described matching result; And table look-up according to the matching result of described locking and to draw corresponding system information.After above-mentioned described lock step: select described latched value; Described matching result and described latched value are compared; Judge whether to enter out-of-lock condition according to described comparative result; And determine according to judged result whether needs lock again.

The present invention has improved the reliability and stability of system information by judging the locking and the losing lock of system information decoded result.

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 schematic diagram that carries out the system information decoder module according to of the present invention in receiver;

Fig. 2 is according to fundamental system information decoding flow chart of the present invention;

Fig. 3 is according to system information lock-out state transition diagram of the present invention;

Fig. 4 is the schematic diagram according to system information decode structures of the present invention;

Fig. 5 is the schematic diagram that is applicable to the fundamental system information decoding module of GB according to of the present invention; And

Fig. 6 is the schematic diagram that is applicable to the system information decode structures of GB according to of the present invention.

Embodiment

Fig. 1 is the schematic diagram that carries out the system information decoding according to of the present invention in receiver.

In order to judge that transmission mode separates the work of modules such as mapping, deinterleaving and channel decoding with control, receiver must be decoded to system information symbol.

As shown in Figure 1, in receiver, receive data through down-conversion, synchronously, after channel equalization, FFT/IFFT (fast fourier transform or reverse Fourier transform) waits and handle, from Frame, extract system information symbol and carry out system information and decode.In decode procedure: judge whether reversal connection of I, Q branch road, and correspondingly provide I/Q reversal connection indication; Judge transmission mode, promptly match carrier mode, mapped mode, interlace mode and encoder bit rate and select, separate steps such as mapping, deinterleaving, channel decoding with control model respectively.

Fig. 2 is according to fundamental system information decoding flow chart of the present invention.

As shown in Figure 2, fundamental system information decoding flow process mainly comprises system information arrow pattern coupling and matching result locking two parts.

(1) system information pattern matching

System information symbol adopts balanced data, everyly reach one and just it is separated be mapped as bit information by separating mapping block 201, so the input of the symbol of serial is converted into bit stream.The only corresponding bit of common each symbol.

Total N vector in the supposing the system dope vector table, each is M bit, can with the size definition of system information vector ROM 203 M * N bit then, the m bit of corresponding n the system information vector of the n bit of address m, same position bit and the input bit of being convenient to once to read all system information vectors are made related operation.Whenever separate information bits of mapping, address generator 200 just produces the address of reading of corresponding ROM, and this address also is the position in the corresponding system information vector of current input bit.For example information bits is that order arrives, and then the ROM address produces from 0 to M-1 order.

Related operation device 202 has comprised N accumulator, respectively corresponding N system information vector.To separate the information bits after the mapping at every turn and carry out adding up with exclusive disjunction and with the result from the n bit that ROM reads, after adding up through M time, the correlation of n system information vector in promptly obtaining input system information and showing.Obtain N the maximum in the correlation by maximizing module 204, corresponding system information vector is the matching result of system information.

Related operation device 202, address generator 200, system information vector ROM 203 and maximizing module 204 can be referred to as matching module.

(2) system information pattern matching result locking

Because the influence of disturbing, may there be error code in system information symbol, causes matching error.If after transmission mode was determined, each Frame had comprised identical system information symbol, then can lock matching result to guarantee to solve the reliability and stability of system information by state machine.By Postponement module 205 the system information pattern matching result of every frame is postponed a frame.Before the locking, selector 206 is selected the system information pattern matching result of former frame, and the system information pattern matching result with present frame compares by comparator 207.When continuous K frame obtains identical system information pattern matching as a result the time, think that this matching result is reliably, it is latched and puts lock indication signal for effectively by latch 209.After the locking, selector 206 selects the system information pattern matching result who latchs to compare by the system information pattern matching result of comparator 207 with present frame, when continuous L frame obtains the matching result different with latched value, think that system information changes, enter out-of-lock condition, need locking again.State transition diagram is referring to Fig. 3.

Postponement module 205, selector 206, comparator 207, lock state machine 208 and latch 209 can be referred to as locking module.

Matching result via latch 209 locking after, tabling look-up by look-up table 210 to draw system information, its validity is provided by the locking indication.

Fig. 3 is according to system information lock-out state transition diagram of the present invention.

As shown in Figure 3, y represents lock indication signal, and ' 1 ' is effective.X is the state machine initial conditions, and i, j are count value, and K and L are respectively the threshold value of judging locking and losing lock.Condition x=1 represents that before locking this frame system information pattern matching result and previous frame pattern matching come to the same thing, and this frame system of expression information pattern matching result is identical with lock value after locking.I counts the x=1 of continuous input before locking, the x=0 counting that j imports continuously to locking the back.

After entering lock-out state, show that the matching result that latchs is reliably, tabling look-up according to matching result to obtain corresponding system information, and its validity is indicated by lock indication signal.

Fig. 4 is the schematic diagram according to system information decode structures of the present invention.

In the transmission system that single and multi-carrier merge, receiver may exist carrier mode the unknown and I, Q two tributary signals to connect situations such as anti-, in order to improve the adaptability of system information decoding, on the basis of Fig. 2 fundamental system information decoding module, can be improved to system information coding/decoding method shown in Figure 4.

Comprise 4 fundamental system information decoding modules among Fig. 4, the i.e. first fundamental system information decoding module 406, the second fundamental system information decoding module 407, the 3rd fundamental system information decoding module 408, the 4th fundamental system information decoding module 409 are respectively to the multicarrier system information symbol decoding of single-carrier system information symbol, multicarrier system information symbol and the I/Q reversal connection of single-carrier system information symbol, I/Q reversal connection.

Under the situation of time domain equalization output data frame, the production method of importing in 4 tunnel system information symbol is: the single-carrier system information symbol directly extracts from Frame by first abstraction module 401; The single-carrier system information symbol of I/Q reversal connection is by the first real part imaginary part Switching Module 404 real part and imaginary part to be exchanged after extracting from Frame by first abstraction module 401 again; The multicarrier system information symbol is Frame to be carried out the FFT computing by FFT module 400 earlier extract by second abstraction module 402 again; The multicarrier system information symbol of I/Q reversal connection is to carry out the FFT computing by 400 pairs of Frames of FFT module earlier and pass through passing through the second real part imaginary part abstraction module 405 again with real part and imaginary part exchange after the 3rd abstraction module 403 extracts.

Under the situation of frequency domain equalization output data frame, the production method of 4 tunnel system information symbol input is: the single-carrier system information symbol is to carry out the IFFT computing by 411 pairs of Frames of IFFT module to extract by first abstraction module 401 again; The single-carrier system information symbol of I/Q reversal connection carries out the IFFT computing by 411 pairs of Frames of IFFT module and by passing through the first real part imaginary part abstraction module 404 again after 401 extractions of first abstraction module real part and imaginary part is exchanged; The multicarrier system information symbol directly extracts from Frame by second abstraction module 402; After extracting from Frame by the 3rd abstraction module 403, the multicarrier system information symbol of I/Q reversal connection by the 3rd real part imaginary part Switching Module 405 real part and imaginary part are exchanged again.

Often added frequency-domain-interleaving in the multicarrier system, so the position of system information symbol in Frame is normally incomplete same in the single and multi-carrier system, should adopts symbol abstraction module separately.For single carrier, whether I, Q branch road connect does not instead influence the position of system information symbol in Frame, therefore can shared same abstraction module, i.e. first abstraction module 401.And, owing to exist FFT computing, I, Q branch road to connect the variation that instead can cause system information symbol position in Frame, therefore adopt different abstraction modules, i.e. second abstraction module 402 and the 3rd abstraction module 403 for multicarrier.Multicarrier I, Q branch road connect anti-situation can be with reference to following theoretical derivation part.

In the multicarrier system, during receiver I/Q reversal connection, the demodulation sub-carrier with the relation derivation of emission symbol is:

Suppose that length is that the Frame of N is x (l), 0≤l≤N-1 carries out the OFDM modulation to Frame in transmitter, promptly carry out N point IFFT computing and obtain

$X\left(k\right)=\frac{1}{N}\underset{l=0}{\overset{N-1}{\mathrm{\Σ}}}x\left(l\right)e^{j\frac{2\mathrm{\πlk}}{N}},0\≤k\≤N-1$

Consider ideal situation, the baseband signal that receiver receives should be X (k).When I, Q branch road connect inverse time, obtain signal Y (k), its real part and imaginary part are opposite with X (k).Y (k) can be expressed as

$Y\left(k\right)=X^{*}\left(k\right)e^{j\frac{\mathrm{\π}}{2}}=\frac{1}{N}{e}^{j\frac{\mathrm{\π}}{2}}\underset{l=0}{\overset{N-1}{\mathrm{\Σ}}}{x}^{*}\left(l\right)e^{-j\frac{2\mathrm{\πlk}}{N}},0\≤k\≤N-1$

Y (k) is carried out the OFDM demodulation, promptly carry out N point FFT computing and obtain

$y\left(m\right)=\underset{k=0}{\overset{N-1}{\mathrm{\Σ}}}\left(\frac{1}{N}{e}^{j\frac{\mathrm{\π}}{2}}\underset{l=0}{\overset{N-1}{\mathrm{\Σ}}}{x}^{*}\left(l\right)e^{-j\frac{2\mathrm{\πlk}}{N}}\right)e^{-j\frac{2\mathrm{\πkm}}{N}}$

$=\frac{1}{N}{e}^{j\frac{\mathrm{\π}}{2}}\underset{k=0}{\overset{N-1}{\mathrm{\Σ}}}\underset{l=0}{\overset{N-1}{\mathrm{\Σ}}}{x}^{*}\left(l\right)e^{-j\frac{2\mathrm{\πk}(m+l)}{N}}$

$=\frac{1}{N}{e}^{j\frac{\mathrm{\π}}{2}}\underset{l=0}{\overset{N-1}{\mathrm{\Σ}}}\left(x^{*}\left(l\right)\underset{k=0}{\overset{N-1}{\mathrm{\Σ}}}{e}^{-j\frac{2\mathrm{\π}(m+l)}{N}k}\right)$

$=\left\{\begin{array}{cc}\frac{1}{N}{e}^{j\frac{\mathrm{\&pi;}}{2}}{x}^{*}\left(0\right)\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{e}^{-\mathrm{<figure-callout\; id="0"\; label="j"\; filenames="S2008101015206E00011.png"\; state="\{\{state\}\}">j</figure-callout>}0},& m=0;\\ \frac{1}{N}{e}^{j\frac{\mathrm{\&pi;}}{2}}{x}^{*}(N-m)\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{e}^{-j2\mathrm{\&pi;k}},& 0<m\&le;N-1.\end{array}\right.$

$=\left\{\begin{array}{cc}{x}^{*}\left(0\right)e^{j\frac{\mathrm{\&pi;}}{2}},& m=0;\\ x^{*}(N-m)e^{j\frac{\mathrm{\&pi;}}{2}},& 0<m\&le;N-1.\end{array}\right.$

Be y (0) and x (0), (real part and the imaginary part of 0＜m≤N-1) are just in time opposite for y (m) and x (N-m).Show that also the 0th subcarrier character position is constant, m sub-carrier changes to N-m sub-carrier positions.

The input of 4 tunnel system information symbol is decoded according to structure shown in Figure 2 respectively.Different is, the ROM address produces successively from 0 to M-1 in the 0th～2 the tunnel.And in the 3 the tunnel, if do not have that frequency-domain-interleaving, the generation of ROM address are 0 in proper order, M-1 ..., 2,1; If through frequency-domain-interleaving, then need to produce the address according to the order after interweaving.

The decoding of 4 tunnel system informations obtains 4 group system information and lock indication signal altogether, judges output by moderator 410.Generally, in the locking indication 0～3, there is and only has one to be effective value, but at some in particular cases, a plurality of effective locking indications may occur.For example under single carrier mode,, then can produce following two kinds of situations because whether I, Q connect instead and do not influence the position of symbol in Frame.A kind of situation, if system information symbol adopts the real part sign map mode identical with imaginary part, no matter whether I, Q connect instead, and the system information symbol that receives all is duplicate, and decoder module 0 and 1 output result also will be identical substantially; Another situation, if system information symbol real part and imaginary part just in time match another pattern after connecing instead, basic decoder module 0 and 1 also can be exported effective lock indication signal simultaneously.

Therefore the judgment rule of moderator is:

(1) there is and only has one effectively in the locking indication 0～3

Suppose that locking indication n (0≤n≤3) is effective, then the locking of moderator indication output is changed to effectively, and system information n is exported.If n=1 or 3 shows that I, Q branch road connect instead, I/Q branch road reversal connection indication is changed to effectively; Otherwise it is invalid to be changed to.

(2) locking indication 0 and locking indication 1 are all effective

I, Q do not connect anti-and connect anti-two kinds of situations under locking indication 0 and the locking indication 1 corresponding single carrier mode.The system information decoder module can't judge whether I, Q branch road connect instead, need transfer to the channel decoding resume module in the case, and it is invalid therefore I/Q branch road reversal connection indication to be changed to.The locking indication output of moderator is changed to effectively output system information 0 (may be incorrect, not connect at I, Q and inverse time be only right value).

(3) other situations

It is invalid that the locking indication output of moderator is changed to, and it is invalid that I/Q branch road reversal connection indication is changed to.

Adopt said method can obtain reliable and stable system information, judge the transmission mode of digital-communications transmission system exactly, in multiple carrier mode system and I, Q connect and have adaptability widely under the anti-situation.

Fig. 5 is the schematic diagram that is applicable to the fundamental system information decoding module of GB according to of the present invention.

In GB, two kinds of mode of operations of single carrier and multicarrier have been merged.System information is totally 36 complex symbols, and preceding 4 complex symbols are the carrier mode designated symbol, supports single carrier and two kinds of patterns of multicarrier; 32 complex symbols in back are modulation and code check isotype designated symbol, comprise the information such as first frame indication, QAM modulating mode, symbol interleaving pattern and LDPC encoder bit rate of superframe, support 64 kinds of patterns at most.Therefore, can be the structure of Fig. 5 according to the method improvement of Fig. 2 with the single-path system information decoding in the receiver

In Fig. 5, the separated device of 36bit system information is divided into the carrier mode indication information of 4bit and modulation and code check isotype indication information two parts of 32bit, mates respectively and locks.Wherein the carrier mode indication information has only two kinds of patterns: " 1111 " expression multicarrier, " 0000 " expression single carrier is so the carrier mode matching process can be reduced to: think multicarrier when ' 1 ' number is greater than threshold value among the 4bit, otherwise be single carrier.The carrier mode matching result locks by state machine equally.After two parts all locked, the locking of whole module indication output was just by being changed to effectively with door 540.

System information symbol input is separated and is mapped as after the bit information through separating mapping block 500, and separated device 510 is separated into carrier mode indication bit and other indication bit such as modulation and code check.Then this 2 part indication bit is mated respectively and lock.

The coupling of other indication bit such as mapped mode, interlace mode, code check is described identical with Fig. 2 with locking process, therefore repeats no more.

The carrier mode indication bit is calculated among the 4bit ' 1 ' number by summation module 530, compares via comparator 531 and threshold value again, and the number when described ' 1 ' is thought multicarrier during greater than threshold value, otherwise is single carrier.Then, carrier mode also locks by state machine, concrete same Fig. 2 of lock operation, and difference is to draw carrier mode by tabling look-up.

Summation module 530, comparator 531, Postponement module 532 can be referred to as the carrier mode matching module.

Postponement module 532, selector 533, comparator 534 and lock state machine 535 can be referred to as the carrier mode locking module.

Fig. 6 is the schematic diagram that is applicable to the system information decode structures of GB according to of the present invention.

System information symbol adopts the identical QPSK modulation of I, Q in the GB, thus under the single carrier mode I, Q whether reversal connection is to not influence of system information symbol.Therefore, can be reduced to system information coding/decoding method shown in Figure 6 according to Fig. 4 structure.

Comprise 3 fundamental system information decoding modules among Fig. 6, the i.e. first fundamental system information decoding module 605, the second fundamental system information decoding module 606, the 3rd fundamental system information decoding module 607 are respectively to the multicarrier system information symbol decoding of single-carrier system information symbol, multicarrier system information symbol and the I/Q reversal connection of single-carrier system information symbol, I/Q reversal connection.

The production method of 3 tunnel system information symbol input is: the single-carrier system information symbol is by directly extracting the Frame of first abstraction module 601 behind time domain equalization; The multicarrier system information symbol carries out the FFT computing by FFT module 600 earlier to Frame and extracts by second abstraction module 602; The multicarrier system information symbol of I/Q reversal connection carries out the FFT computing to Frame and by passing through the second real part imaginary part abstraction module 604 again after 603 extractions of the 3rd abstraction module real part and imaginary part is exchanged.

Added frequency-domain-interleaving in the multi-carrier mode of GB, so the position of system information symbol in Frame is incomplete same in the single and multi-carrier system, should adopts symbol abstraction module separately.For single carrier, whether I, Q branch road connect does not instead influence the position of system information symbol in Frame, therefore can shared same abstraction module, i.e. first abstraction module 601.And, owing to exist FFT computing, I, Q branch road to connect the variation that instead can cause system information symbol position in Frame, therefore adopt different abstraction modules, i.e. second abstraction module 602 and the 3rd abstraction module 603 for multicarrier.

The input of 3 tunnel system information symbol is decoded according to structure shown in Figure 2 respectively.Different is, the ROM address produces successively from 0 to M-1 in the 0th～1 the tunnel.And in the 2 the tunnel, the ROM address need produce according to the order behind the frequency-domain-interleaving.

The decoding of 3 tunnel system informations obtains 3 group system information and lock indication signal altogether, judges output by moderator 608.

In Fig. 6, the judgment rule of moderator is reduced to:

(1) there is and only has one effectively in the locking indication 0～2

Suppose that locking indication n (0≤n≤2) is effective, then the locking of moderator indication output is changed to effectively, and system information n is exported.If n=2 shows that I, Q branch road connect instead, I/Q branch road reversal connection indication is changed to effectively; Otherwise it is invalid to be changed to.Wherein can't judge whether I, Q branch road connect instead during n=0.

(2) other situations

It is invalid that the locking indication output of moderator is changed to, and it is invalid that I/Q branch road reversal connection indication is changed to.

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.

Claims (19)

1. system information coding/decoding method is characterized in that:

Particular combinations to following four tunnel system information symbol input is decoded, wherein

The input of first via system information symbol is the single-carrier system information symbol input of extracting from balanced output data frame, and input is decoded and drawn first via system information and first via locking indication to first via system information symbol;

The second tunnel system information symbol input is the I/Q reversal connection extracting from balanced output data frame and the real part imaginary part is exchanged, and input is decoded and drawn the second tunnel system information and the second tunnel locking indication to the second tunnel system information symbol;

The input of Third Road system information symbol is the multicarrier system information symbol input of extracting from balanced output data frame, and input is decoded and drawn Third Road system information and Third Road locking indication to the Third Road system information symbol;

The input of the four tunnel system information symbol is the multicarrier system information symbol input of extracting the I/Q reversal connection that then the real part imaginary part is exchanged from balanced output data frame, and input is decoded and drawn the four tunnel system information and the four tunnel locking indication to the four tunnel system information symbol; And

The particular combinations of above-mentioned four tunnel system informations and locking indication is selected to draw system information, locking indication and I/Q branch road reversal connection indication.

2. method as claimed in claim 1 also comprises:

Before the described extraction step of the first via and the second tunnel, described balanced output data frame is carried out reverse fast fourier transform (IFFT); Perhaps

Before Third Road and the four tunnel described extraction step, described balanced output data frame is carried out fast Fourier transform (FFT).

3. method as claimed in claim 1 is characterized in that described decoding step comprises:

System information symbol input separated be mapped as bit;

Each vector carries out pattern matching in bit after the mapping and the system information vector table with separating, and draws system information pattern matching result;

When satisfying predetermined condition, lock described system information pattern matching result; And

Table look-up according to the system information pattern matching result of described locking and to draw corresponding system information.

4. described method as claimed in claim 3, wherein said lock step comprises:

The described system information pattern matching result and the system information pattern matching result of frame are before compared;

Utilize lock state machine to judge whether that according to described comparative result needs latch described system information pattern matching result;

According to described judged result described system information pattern matching result is latched.

5. method as claimed in claim 4, be included in described latch step after:

Select the system information pattern matching result after described the latching;

The system information pattern matching result and the described system information pattern matching result who latchs of present frame are compared;

Utilize lock state machine to judge whether to enter out-of-lock condition according to described comparative result; And

Determine according to judged result whether needs lock again.

6. method as claimed in claim 3 also comprises:

With described bit separation of separating after the mapping is carrier mode indication bit and other indication bit.

7. method as claimed in claim 6 also comprises:

The carrier mode indication bit is carried out the carrier mode coupling, draw the carrier mode matching result;

When satisfying predetermined condition, lock described carrier mode matching result, and draw carrier mode information according to the carrier mode matching result of described locking; Simultaneously

Other indication bit are carried out described pattern matching, locking and the step of tabling look-up, draw other indication bit information.

8. method as claimed in claim 7 also comprises:

When described carrier mode matching result and other indication bit matching results are all locked, will lock indication and be changed to effectively.

9. method as claimed in claim 1, wherein said particular combinations are one of following:

The input of first via system information symbol;

The input of Third Road system information symbol;

Input of first via system information symbol and the input of Third Road system information symbol;

Input of first via system information symbol and the input of the second tunnel system information symbol;

Input of Third Road system information symbol and the input of the four tunnel system information symbol;

The input of first via system information symbol, the input of Third Road system information symbol and the input of the four tunnel system information symbol; And

The input of first via system information symbol, the input of the second tunnel system information symbol, the input of Third Road system information symbol and the input of the four tunnel system information symbol.

10. the method for claim 1, the rule of wherein said selection are one of following:

If one of the first via to the four tunnel locking indication is effectively, then will lock indication and be changed to effectively and export this road system information, and if the first via or Third Road locking indication effectively, then be changed to I/Q branch road reversal connection indication effective;

If the first via and the second tunnel locking indication are all effective, then will lock indication and be changed to effectively and export first via system information, it is invalid that I/Q branch road reversal connection indication is changed to; And

In other cases, will lock indication and be changed to invalidly, it is invalid that I/Q branch road reversal connection indication is changed to, not output system information.

11. a system information decoding device is characterized in that:

The particular combinations that comprises following four branch roads, wherein,

First branch road comprises,

First abstraction module is used for extracting the input of single-carrier system information symbol with as the input of first via system information symbol from balanced output data frame,

The first fundamental system information decoding module, being used for first via system information symbol input decoded draws first via system information and first via locking indication;

Second branch road comprises,

The first real part imaginary part Switching Module is used for the single-carrier system information symbol input of extracting from balanced output data frame by first abstraction module is carried out the exchange of real part imaginary part with as the input of the second tunnel system information symbol,

The second fundamental system information decoding module, being used for the second tunnel system information symbol input decoded draws the second tunnel system information and the second tunnel locking indication;

The 3rd branch road comprises,

Second abstraction module is used for extracting the input of multicarrier system information symbol with as the input of Third Road system information symbol from balanced output data frame,

The 3rd fundamental system information decoding module, being used for Third Road system information symbol input decoded draws Third Road system information and Third Road locking indication;

The 4th branch road comprises,

The 3rd abstraction module is used for extracting the input of multicarrier system information symbol from balanced output data frame,

The second real part imaginary part Switching Module is used for the described multicarrier system information symbol input of extracting from balanced output data frame is carried out the exchange of real part imaginary part with as the input of the four tunnel system information symbol,

The 4th fundamental system information decoding module, being used for the four tunnel system information symbol input decoded draws the four tunnel system information and the four tunnel locking indication; And

Moderator is used for the particular combinations of above-mentioned four tunnel system informations and locking indication is selected to draw system information, locking indication and I/Q branch road reversal connection indication.

12. the equipment as claim 11 is characterized in that:

In first branch road and second branch road, comprise reverse fast fourier transform module, be used for balanced output data frame is carried out reverse fast fourier transform (IFFT), perhaps

In the 3rd branch road and the 4th branch road, comprise the fast fourier transform module, be used for balanced output data frame is carried out fast Fourier transform (FFT).

13. as the equipment of claim 11, wherein said fundamental system information decoding module comprises:

Separate mapping block, be used for system information symbol input separated and be mapped as bit;

Matching module, bit and each vector of system information vector table of being used for separating after the mapping carry out pattern matching, draw system information pattern matching result;

Locking module is used for locking described system information pattern matching result when satisfying predetermined condition; And

Look-up table is used for system information pattern matching result according to described locking and tables look-up and draw corresponding system information.

14. as the equipment of claim 13, wherein said locking module comprises:

Comparator is used for the described system information pattern matching result and the system information pattern matching result of frame are before compared;

Lock state machine is used for judging whether that according to described comparative result needs latch described system information pattern matching result;

Latch is used for according to described judged result described system information pattern matching result being latched.

15. as the equipment of claim 13, wherein said fundamental system information decoding module also comprises:

Separator, being used for described bit separation of separating after the mapping is carrier mode indication bit and other indication bit.

16. as the equipment of claim 15, wherein said fundamental system information decoding module also comprises:

The carrier mode matching module is used for the carrier mode indication bit is carried out the carrier mode coupling, draws the carrier mode matching result;

The carrier mode locking module is used for locking described carrier mode matching result when satisfying predetermined condition, and draws carrier mode information according to the carrier mode matching result of described locking.

17. as the equipment of claim 16, wherein said fundamental system information decoding module also comprises:

With door, be used for when described carrier mode matching result and other indication bit matching results are all locked, will lock indication and being changed to effectively.

18. as the equipment of claim 11, wherein said particular combinations is one of following:

First branch road;

The 3rd branch road;

First branch road and the 3rd branch road;

First branch road and second branch road;

The 3rd branch road and the 4th branch road;

First branch road, the 3rd branch road and the 4th branch road; And

First branch road, second branch road, the 3rd branch road and the 4th branch road.

19. equipment as claimed in claim 11, the rule of wherein said selection are one of following:

If one of the first via to the four tunnel locking indication is effectively, then will lock indication and be changed to effectively and export this road system information, and if the first via or Third Road locking indication effectively, then be changed to I/Q branch road reversal connection indication effective;

If the first via and the second tunnel locking indication are all effective, then will lock indication and be changed to effectively and export first via system information, it is invalid that I/Q branch road reversal connection indication is changed to; And

In other cases, will lock indication and be changed to invalidly, it is invalid that I/Q branch road reversal connection indication is changed to, not output system information.

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