CN102957656B - The sending and receiving methods and device of system information in digital audio broadcast system - Google Patents
The sending and receiving methods and device of system information in digital audio broadcast system Download PDFInfo
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- CN102957656B CN102957656B CN201210293402.6A CN201210293402A CN102957656B CN 102957656 B CN102957656 B CN 102957656B CN 201210293402 A CN201210293402 A CN 201210293402A CN 102957656 B CN102957656 B CN 102957656B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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Abstract
The invention discloses the sending and receiving methods and device of system information in a kind of digital audio broadcast system, during transmission, system information is carried out into CRC codings and channel coding treatment produces coded bit stream；Coded bit stream is carried out into Bit Interleave treatment and constellation mapping treatment obtains the CP continuous pilot comprising system information；Other signal elements of the continuous pilot signal and system are multiplexed to the carrier wave method of salary distribution specified according to spectrum mode the frequency-region signal of orthogonal multiplex structure；The frequency-region signal is converted into time-domain signal for sending.During reception, time-domain signal is converted into frequency-region signal；The CP continuous pilot comprising system information is extracted from effective carrier wave of the frequency-region signal in the position specified according to spectrum mode；The estimate of system information is obtained using demapping, deinterleaving and channel decoding；The correctness of system information judge and output system information using CRC decodings.The present invention on the basis of the efficiency of transmission for ensureing system information, can improve the robustness of its transmission.
Description
Technical field
The present invention relates to system information in DAB Technology field, more particularly to a kind of digital audio broadcast system
Sending and receiving methods and transceiver.
Background technology
The features such as there is digital audio broadcast system the availability of frequency spectrum high, wide coverage, programme content to enrich.In order to carry
For more preferable service quality and Consumer's Experience, digital audio broadcasting is generally supported including many including data service and audio service
Plant business model.
System information in digital audio broadcast system（Also referred to as control information）Transmission and receive to system worked well
Play vital effect.The modulation coding mode of main business, the carrier wave method of salary distribution etc. are generally included in system information important
Content, once mistake occurs in system information, may cause the connection failure of whole system.On the other hand, the demodulation of system information
Must be rapidly completed with decoding, it is very high to requirement of real-time, if system information can not be solved in time, equally influence whether
Whole system.Therefore, effective robust（That is robustness）System information transmission and method of reseptance be digital audio broadcast system
One of key in design.In the digit broadcasting systems such as current DVB-T, DRM, HD-Radio and CMMB, have selected more
Efficient system information transmissions scheme, but its robustness can not be guaranteed, therefore digital audio broadcast system can not be met
Requirement.
The content of the invention
In view of this, it is a primary object of the present invention to provide a kind of transmission of system information in digital audio broadcast system
Method of reseptance and transceiver, on the basis of the efficiency of transmission for ensureing system information, improve the robustness of its transmission.
The technical proposal of the invention is realized in this way：When sending, comprise the following steps：A, the system that transmission will be needed
Information is circulated redundancy check CRC codings and channel coding treatment successively, produces coded bit stream；B, by the coded-bit
Stream carries out Bit Interleave treatment and constellation mapping treatment, obtains the CP continuous pilot comprising system information；C, according to spectrum mode advise
The fixed carrier wave method of salary distribution, other signal elements of the continuous pilot signal and system are multiplexed to the frequency of orthogonal multiplex structure
Domain signal；D, the frequency-region signal is converted into time-domain signal for send.
Before wherein carrying out the multiple connection operation in step C, further include：According to system frame structure, generation has
The continuous pilot signal of repeated characteristic.In the continuous pilot signal with repeated characteristic, system information is with a logic
Subframe is transmitted for unit, and in a logic subframe, system information symbol repetition is transmitted secondary.The CP continuous pilot letter
Distribution mode number on carrier wave and symbol is：According to spectrum mode from left to right by the lower half subband of each effective subband and
The system information symbol of the logic subframe that upper half subband is carried is individually positioned on continuous carrier wave.
The method further enhances the power of the continuous pilot signal.
When receiving, comprise the following steps：A, time-domain signal is converted into frequency-region signal；B, according to spectrum mode specify
Position, extracts the CP continuous pilot comprising system information from effective carrier wave of the frequency-region signal；C, using demapping, deinterleave
With the estimate that channel decoding obtains system information；D, the correctness of system information is judged using CRC decodings, according to sentencing
Disconnected result output system information.
It is specific to utilize including the deversity scheme including frequency diversity and time diversity to effective carrier wave in step b
CP continuous pilot carries out signal detection, and extracts CP continuous pilot.
The dispensing device of system information in digital audio broadcast system of the invention, including：CRC encoder,
For input system information, redundancy check coding is circulated, generation includes the systematic code output of system information and check information
To channel encoder；Channel encoder, for the systematic code according to input, searches out corresponding coding code in codeword set
Word, generation includes that the coded bit stream of redundancy is exported to bit interleaver；Bit interleaver, for according to pre-defined rule pair
The coded bit stream of input is resequenced and is exported to constellation mapper；Constellation mapper, for the coded bit stream that will be input into
Mapping obtains CP continuous pilot；Multiplexer, for the carrier wave method of salary distribution specified according to spectrum mode, by the continuous pilot signal
Together with other signal element multiple connections of system, produce the frequency-region signal of orthogonal multiplex structure to export and give time and frequency zone converter；
Time and frequency zone converter, for input frequency domain signal to be transformed into time-domain sampling for sending.
The dispensing device is further included：Reproducer, is arranged between the constellation mapper and multiplexer, for basis
System frame structure, produces the continuous pilot signal with repeated characteristic and exports to multiplexer.
The reception device of system information in digital audio broadcast system of the invention, including：When-frequency converter, for inciting somebody to action
Time-domain signal is converted to frequency-region signal and exports to signal detector；Signal detector, the position specified according to spectrum mode, from
The CP continuous pilot comprising system information is extracted in effective carrier wave of the frequency-region signal and is exported to de-mapping device；De-mapping device,
For to the CP continuous pilot demapping and exports coding bit stream to deinterleaver；Deinterleaver, for the encoding ratio
Special stream is deinterleaved and exports decoder；Channel decoder, for carrying out channel decoding to input signal, obtains system letter
The estimate of breath is simultaneously exported and gives CRC decoders；CRC decoders, the correctness for the system information to being input into judges, defeated
Go out judged result.
Compared with prior art, system information of the invention sends reception scheme under conditions of extra bandwidth is not needed,
The efficiency of transmission of system information is ensure that, and improves the robustness of system information transmissions on this basis, and the present invention
Can also support that flexible spectrum mode and multifrequency point cooperate, the frequency diversity such that it is able to significantly improve ofdm system increases
Benefit, reduces error rate of system, increases coverage or reduces transmission power.It is also possible in CP continuous pilot letter
Repeat to send system information in number, therefore the probability that system information is correctly decoded can be improved, can also be by bearing system information
CP continuous pilot power enhancing, so as to further increase the robustness of system information.The present invention can be widely applied to defend
Each digital audio broadcasting fields such as star audio broadcasting, terrestrial wireless audio broadcasting, the hand-held audio broadcasting in ground, are particularly applicable to
Using the multicarrier system of Fourier conversion, Walsh conversion or wavelet transformation.
Brief description of the drawings
Fig. 1 is the schematic diagram of the dispensing device of system information in digital audio broadcast system of the present invention；
Fig. 2 is the schematic diagram of the reception device of system information in digital audio broadcast system of the present invention；
Fig. 3 is the baseband frequency spectrum schematic diagram of ofdm communication system of the present invention；
Fig. 4 is CRC shift registers block diagram of the present invention；
Fig. 5 is the schematic diagram of encoder for convolution codes of the present invention；
Fig. 6 is QPSK signal constellation and mappings of the present invention；
Fig. 7 is the module frame chart of frequency-region signal generation of the present invention；
Sub-carrier indices schematic diagram when Fig. 8 is transmission mode of the present invention 1 and 3；
Sub-carrier indices schematic diagram when Fig. 9 is transmission mode 2 of the present invention；
Figure 10 is the embodiment schematic diagram of the reception system information for receiving of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is further described in more detail.
Digital audio broadcast system described in the embodiment of the present invention is based on COFDM（COFDM）Numeral
Audio droadcasting system.
Fig. 1 is the schematic diagram of the dispensing device of system information in digital audio broadcast system of the present invention.Referring to Fig. 1,
The dispensing device includes：
CRC（CRC）Encoder, for input system information, is circulated redundancy check coding, produces bag
The systematic code for including system information and check information is exported to channel encoder；
Channel encoder, for the systematic code according to input, searches out corresponding coding codeword in codeword set, produces
Coded bit stream including redundancy is exported to bit interleaver；
Bit interleaver, for the coded bit stream being input into be resequenced and exported to constellation mapping according to pre-defined rule
Device；
Constellation mapper, for the coded bit stream mapping of input to be obtained into CP continuous pilot；After the bit stream segmentation of input
Corresponding symbol of the every section of bit stream in constellation space is searched out, symbol sebolic addressing is produced and is exported to multiplexer；
Multiplexer, for the carrier wave method of salary distribution specified according to spectrum mode, by the continuous pilot signal and system
Other signal elements（Such as load, discrete guide-frequency signal）Multiple connection together, produce orthogonal multiplex structure frequency-region signal export to
Time and frequency zone converter；
Time and frequency zone converter, for input frequency domain signal to be transformed into time-domain sampling for sending.
For the robustness of further safeguards system information transfer, the present invention can further include a reproducer, if
Put between the constellation mapper and multiplexer, for according to system frame structure, producing the CP continuous pilot with repeated characteristic
Signal（There is the symbol sebolic addressing of repeated characteristic）And export to multiplexer.
Fig. 2 is the schematic diagram of the reception device of system information in digital audio broadcast system of the present invention.Referring to Fig. 2 institutes
Show, the reception device includes：
When-frequency converter, for time-domain signal being converted into frequency-region signal and being exported to signal detector；
Signal detector, the position specified according to spectrum mode is extracted from effective carrier wave of the frequency-region signal and is included
The CP continuous pilot of system information is simultaneously exported to de-mapping device；It is specific using including dividing including frequency diversity and time diversity herein
Diversity method carries out signal detection to the CP continuous pilot of effective carrier wave, and extracts CP continuous pilot.
De-mapping device, for the CP continuous pilot demapping and exports coding bit stream to deinterleaver；
Deinterleaver, for being deinterleaved to the coded bit stream and exports decoder；
Channel decoder, for carrying out channel decoding to input signal, using including including SOVA and BCJR based on disappearing
The decoding FEC of transmission is ceased, and Sum-LLR methods are decoded to CP continuous pilot, obtain the estimate of system information simultaneously
Export and give CRC decoders
CRC decoders, for judging the correctness of system information being input into, export judged result.
Based on the sending and receiving device described in Fig. 1 and Fig. 2, digital audio broadcast system of the present invention is described below
The method of sending and receiving of middle system information.
The sending method of system information of the present invention includes：
Step 101, will need send system information carry out successively CRC codings and channel coding treatment, produce encoding ratio
Spy's stream.
In this step, specific generation using CRC codings includes the systematic code of system information and check information；The channel
Coding searches out corresponding coding codeword i.e. according to the systematic code in codeword set, and generation includes the encoding ratio of redundancy
Spy's stream.Also, the channel coding treatment is specially convolutional encoding treatment.
Step 102, the coded bit stream is carried out Bit Interleave treatment and constellation mapping treatment, obtain comprising system believe
The CP continuous pilot of breath.
The Bit Interleave treatment specifically includes block interleaved treatment and convolutional interleave treatment, according to pre-defined rule to coding
Bit stream is resequenced；The constellation mapping treatment is specially the treatment of QPSK mapping modes, is searched out after bit stream is split every
Corresponding symbol of the section bit stream in constellation space, produces the symbol sebolic addressing of system information.
Step 103, using the symbol sebolic addressing as the CP continuous pilot of system information, the carrier wave specified according to spectrum mode is distributed
Mode, other signal elements of the continuous pilot signal and system are multiplexed to the frequency-region signal of orthogonal multiplex structure.One
Plant in preferred embodiment, before carrying out the multiple connection operation, can also further include：According to system frame structure, generation has repetition
The continuous pilot signal of feature.
Step 104, the frequency-region signal is converted into time-domain signal for send.
Corresponding, the method for reseptance of system information includes in receiving terminal, described digital audio broadcast system：
Step 201, time-domain signal is converted into frequency-region signal.
Step 202, the position specified according to spectrum mode, extract the system of including from effective carrier wave of the frequency-region signal
The CP continuous pilot of information.Specifically, using including the deversity scheme including frequency diversity and time diversity to effective carrier wave
CP continuous pilot carry out signal detection, and extract CP continuous pilot.
Step 203, the estimate that system information is obtained using demapping, deinterleaving and channel decoding.The channel decoding
Specially：Including the decoding FEC based on message transmission including SOVA and BCJR.
Step 204, the correctness of system information is judged using CRC decodings, believed according to judged result output system
Breath.
System frame structure of the present invention includes 4 layers of superframe, frame, subframe and OFDM symbol.The present invention is divided into three
Transmission mode.In transmission mode 1, each superframe is divided into 4 frames, and each frame is divided into 4 subframes, and each subframe is divided into 57
OFDM symbol, each symbol has 242 effective carrier waves.It is same that first OFDM symbol of each subframe is used for system as beacon
Step and demodulation pretreatment, 56 OFDM symbols are then comprising load, scattered pilot, CP continuous pilot and virtual subcarrier in addition.Passing
In defeated pattern 2, each superframe is divided into 4 frames, and each frame is divided into 4 subframes, and each subframe is divided into 112 OFDM symbols, each
Symbol has 122 effective carrier waves.First OFDM symbol of each subframe is then wrapped as beacon, in addition 111 OFDM symbols
Containing load, scattered pilot, CP continuous pilot and virtual subcarrier.In transmission mode 3, each superframe is divided into 4 frames, each frame point
It is 4 subframes, each subframe is divided into 62 OFDM symbols, and each symbol has 242 effective carrier waves.Wherein, each subframe
First OFDM symbol is then carried as beacon, in addition 61 OFDM symbols comprising load, scattered pilot, CP continuous pilot and virtual subnet
Ripple.Each OFDM symbol by protection interval as prefix to reduce OFDM symbol between disturb.Transmission mode 1 and transmission mode 3
Subcarrier spacing it is identical, but protection interval length is different, the subcarrier spacing of transmission mode 2 is the two of foregoing both of which
Times.Define the systematic parameters such as unit interval T=1/816000 second, subcarrier spacing, mark space, insured interval as shown in table 1：
Table 1
Ofdm signal is made up of most subbands of 8 names with a width of 100kHz.Spectrum mode defines the quantity of subband,
And the position of effective subband and empty subband.In partial frequency spectrum pattern, in the upper half subband or lower half subband of some effective subbands
Whole subcarriers are empty subcarrier.Fig. 3 is the baseband frequency spectrum schematic diagram of ofdm communication system of the present invention, referring to Fig. 3, wherein
0 Frequency point correspondence signal center frequency, the i.e. position of OFDM symbol subcarrier 0.
Spectrum mode in the present invention has two classes, i.e. A classes spectrum mode and B class spectrum modes.Wherein A classes spectrum mode bag
Containing 8 subbands, the nominal frequency of subband is ± (i*100+50) kHz, i=0,1,2,3；B classes spectrum mode includes 7 subbands, son
It is the integral multiple of 100kHz, i.e. ± i*100kHz, i=0,1,2,3 with nominal frequency.In system information, 3 bits can be used
The absolute value of the difference on the frequency of one center frequency point of subband of description and signal center's frequency, the i.e. nominal frequency position of subband, table 2 are given
The corresponding relation of the nominal frequency position of subband and bit described in system information is gone out.
| Bit value | The nominal frequency position of subband |
| 000 | 0kHz |
| 100 | 50kHz |
| 010 | 100kHz |
| 110 | 150kHz |
| 001 | 200kHz |
| 101 | 250kHz |
| 011 | 300kHz |
| 111 | 350kHz |
Table 2
System information described in digital audio broadcast system of the invention is made up of 48 bits, including multifrequency point collaboration
The information such as job information, spectrum mode index, coding, modulation, CRC codings.
The bit b of system information0b1...b47Definition see the table below shown in 3：
| Bit | Information is described |
| Multifrequency point cooperative work mode is indicated | |
| Next subframe multifrequency point collaborative work frequency | |
| The nominal frequency of current sub-band | |
| Spectrum mode is indexed | |
| The position of current physical layer signal frame | |
| Present sub-frame position | |
| The subframe method of salary distribution | |
| The modulation system of business description information | |
| The modulation system of business datum | |
| The hierarchical modulation of business datum is indicated | |
| The coding of business datum is using the uniform instruction protected | |
| The LDPC encoder bit rates of business datum | |
| The LDPC encoder bit rates of business datum | |
| Retain Rfa | |
| CRC check position |
Table 3
Each bit in the table 3 is defined as follows：
b0：Multifrequency point cooperative work mode is indicated, and 0 represents that multifrequency point cooperates；1 represents that non-multifrequency point cooperates.
, it is necessary to 1 bit indicates whether present sub-frame supports that multifrequency point cooperates in system information, if supported, in addition it is also necessary to volume
Working frequency points of outer 9 than next subframe in instruction Contemporary Digital radio station.Multifrequency point cooperative work can be significantly improved
The frequency diversity gain of ofdm system, so as to reduce error rate of system, increases coverage or reduces transmission power.Multifrequency point
Collaborative work is that multiple Traffic Channels are interweaved on multiple frequencies based on frequency hopping, alternately takes each default frequency
Road, the actual propagation channel of formation has stronger selectivity in frequency, then is selectively converted to frequency by this by encoding
Diversity.Frequency hopping is in units of subframe, to be realized by the cycle of superframe.
b1~b9：The frequency that next subframe multifrequency point cooperates, makes b1~b9The signless integer of expression（Wherein b1For
Highest significant position）It is I, then next subframe multichannel collaborative work frequency is (87+0.05*I) MHz, in the collaboration of non-multifrequency point
During work, b1~b9It is 1.
b10~b12：The nominal frequency of current sub-band, definition is shown in Table 2, b10~b12It is corresponding in turn to the s in table 20~s2。
b13~b18：Spectrum mode is indexed, and can represent 39 kinds of possible spectrum modes.
b19~b20：Position of the current physical layer signal frame in a superframe, 00 represents the 1st frame；01 represents the 2nd frame；10
Represent the 3rd frame；11 represent the 4th frame.
b21~b22：Position of the present sub-frame in a physical layer signal frame, 00 represents the 1st subframe；01 represents the 2nd son
Frame；10 represent the 3rd subframe；11 represent the 4th subframe.
b23~b24：The subframe method of salary distribution, 00 retains；01 represents the subframe method of salary distribution 1；10 represent the subframe method of salary distribution 2；
11 represent the subframe method of salary distribution 3.
b25~b26：The modulation system of business description information, 00 represents QPSK；01 represents 16QAM；10 represent 64QAM；11
Retain.
b27~b28：The modulation system of business datum, 00 represents QPSK；01 represents 16QAM；10 represent 64QAM；11 retain.
b29~b30：The hierarchical modulation of business datum is indicated, and hierarchical modulation is not supported in 00 expression；01 represents that support layering is adjusted
System and α=1；10 represent support hierarchical modulation and α=2；11 represent support hierarchical modulation and α=4.
b31：The coding of business datum does not use uniform protection using the uniform instruction protected, 0 expression；1 represents using uniform
Protection.
b32~b33：The LDPC encoder bit rates of business datum, the encoder bit rate of 00 table 1/4；01 represents 1/3 encoder bit rate；10 tables
Show 1/2 encoder bit rate；11 represent 3/4 encoder bit rate.
b34~b35：The LDPC encoder bit rates of business datum, 00 represents 1/4 encoder bit rate；01 represents 1/3 encoder bit rate；10
Represent 1/2 encoder bit rate；11 represent 3/4 encoder bit rate.
When non-layered is modulated, the encoder bit rate of business datum during according to uniform protection is by b32~b33Indicate, b34~
b35Retain；According to uneven protection, then the encoder bit rate of business datum is obtained from business description information, b32~b35Retain.
In hierarchical modulation, the encoder bit rate of the business datum of height protection is by b32~b33Indicate, the coding code of the business datum of minimum living shield
Rate is by b34~b35Indicate.
b36~b41：Retain Rfa, be left extension in the future and use.
b42~b47：CRC check position.
In above-mentioned steps 101, CRC is sequentially carried out to the 0th to the 41st system information and is calculated the 42nd in table 3
The CRC check position of 47.The generator polynomial of CRC is：G6(x)=x6+x5+x3+x2+ x+1, its corresponding shift register block diagram
See Fig. 4, the initial value of shift register is 111111.
In above-mentioned steps 101, the channel coding use constraint length for 7 1/4 convolutional code, the encoder of convolutional code
As shown in figure 5, corresponding octal system generator polynomial is：133,171,145,133, shift register initial value is complete " 0 ".Volume
Encoder is accumulated by input bit ai, i=0,1 ..., T-1 generation code words x0, i, x1, i, x2, i, x3, i, i=0,1,2 ..., T+5 should
Code word is defined as follows：
When i is not belonging to set { 0,1,2 ..., T-1 }, aiIt is zero.Each code wordSuccessively
A serial mother code word U is ordered as, is expressed as：U=(u0,u1,u2..., ui..., u4T+23), wherein,
System information carries out convolutional encoding.Reset in the original position of each logical frame for business description information linear anti-
Feedback shift register, the original position for system information in each logic subframe resets linear feedback shift register.System
The low level of message bit stream is in preceding, i.e. b0Preceding.
In above-mentioned steps 102, coded bit stream carries out constellation mapping in QPSK modes, and Fig. 6 gives QPSK constellations and reflects
Penetrate figure.Coded bit stream is input into constellation mapper in the preferential modes of MSB, sequence of the mapper as corresponding to every group of two bits
Number output symbol, produces symbol sebolic addressing.
Fig. 7 is the module frame chart of frequency-region signal generation of the present invention, as shown in fig. 7, in above-mentioned steps 103, with institute
Symbol sebolic addressing is stated as CP continuous pilot, and load and scattered pilot multiple connection, and virtual subcarrier is added, generation is with orthogonal multiplex
The OFDM frequency-region signals of structure.
In the present invention, the system information is transmitted in units of a subframe.According to system frame structure, CP continuous pilot is also needed
To repeat to send in multiple symbols, to improve the probability that system information is correctly decoded.
Distribution mode of the CP continuous pilot on carrier wave and symbol is as follows：
One system information of logic subframe includes 108 system information symbols.From left to right will be every according to spectrum mode
One lower half subband of effective subband（When its subcarrier is not all empty subcarrier）With upper half subband（When its subcarrier is not all
During empty subcarrier）108 system information symbols that the system information of the logic subframe for carrying is included are individually positioned in continuously
Carrier wave on.
Construction line number is 4*SN, columns is Nv*NISubcarrier matrix M, the line number of subcarrier matrix and columns from 1
Start counting up.Element in subcarrier matrix is divided into system information elements, scattered pilot element and data element.By subcarrier square
Battle array is S by line number from top to bottom, is from left to right divided intoN, columns is NvSubmatrix MS, t, i.e.,WhereinmA, b(a=1,2,…SN,b=1,2,…,Nv) represent
Element in submatrix.
Table 5 gives system information elements positioned at Ms,tThe position arranged in per a line, table 6 is given under each transmission mode
System information symbol takes Ms,tRow position.
In a logic subframe, 108 system information symbols of system information are repeated twice, for example, transmission mode 1
In, Ms,tThe 1st~27 row in 108 system information symbols of position place system information specified of table 5, the 28th~54 row
Specified location also places same system information symbol.
Table 5
Table 6
In transmission mode 1, MS, t55~56 rows in the system that 1~2 row placed filled on the position specified of table 5 believe
Breath symbol, in transmission mode 2, MS, t109~111 rows in the system that 1~3 row placed filled on the position specified of table 5 believe
Breath symbol, in transmission mode 3, MS, t55~61 rows in fill the system information that 1~7 row is placed on the position specified of table 5
Symbol.
Sub-carrier indices schematic diagram when Fig. 8 is transmission mode 1 and 3.Sub-carrier indices when Fig. 9 is transmission mode 2 are shown
It is intended to.Referring to Fig. 8 and Fig. 9, the power of shown CP continuous pilot is enhanced 3dB, to reduce inter-carrier interference to CP continuous pilot
Influence, further improves the robustness of system information.
Figure 10 is the embodiment schematic diagram of the reception system information for receiving of the present invention.Referring to Figure 10, in receiving terminal,
Specifically include：
Time-domain signal is converted into frequency-region signal；CP continuous pilot is extracted according to spectrum mask assigned position.Estimated using channel
Meter and balanced device are demodulated to the CP continuous pilot（That is demapping）, obtain including the demodulation symbol of diversity gain（It is i.e. soft
Information）；Duplication code decoding is carried out again, the Soft Inform ation of demodulated signal is added, obtain relatively reliable demapping result（Strengthen
Soft Inform ation）；Again by the demapping result by being input into SOVA or BCJR channel decoders after deinterleaving, generation includes system
The control Soft Inform ation of information and CRC check information（That is system Soft Inform ation）, it is on the one hand defeated after being made decisions to the control Soft Inform ation
Go out system information, the judgement for providing system information correctness is on the other hand decoded by CRC.If providing system information error
Instruction, then need the system information again to next superframe to be decoded again, until provide system information correctly indicating.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Within god and principle, any modification, equivalent substitution and improvements done etc. should be included within the scope of protection of the invention.
Claims (13)
1. in a kind of digital audio broadcast system system information sending method, it is characterised in that the sending method includes：
A, will need send system information be circulated successively redundancy check CRC coding and channel coding treatment, produce coding
Bit stream；
B, the coded bit stream is carried out Bit Interleave treatment and constellation mapping treatment, obtain comprising system information continuous leading
Frequently；
C, the carrier wave method of salary distribution specified according to spectrum mode, other signal elements of the continuous pilot signal and system are answered
It is connected into the frequency-region signal of orthogonal multiplex structure；
D, the frequency-region signal is converted into time-domain signal for send；
Wherein, the system information at least include the nominal frequency point information of current sub-band, spectrum mode index information, coding information,
Modulation intelligence and CRC coding informations；
The spectrum mode is divided into A classes spectrum mode and B class spectrum modes, and the A classes spectrum mode includes 8 subbands, subband
Nominal frequency is ± (i*100+50) kHz, i=0,1,2,3, the B classes spectrum mode includes 7 subbands, the nominal frequency of subband
It is ± i*100kHz, i=0,1,2,3.
2. sending method according to claim 1, it is characterised in that before the multiple connection operation is carried out in step C, enter
One step includes：According to system frame structure, continuous pilot signal of the generation with repeated characteristic.
3. sending method according to claim 2, it is characterised in that the method further enhances the continuous pilot signal
Power.
4. sending method according to claim 2, it is characterised in that in step C, described with the continuous of repeated characteristic
In pilot signal, system information is transmitted in units of a logic subframe, and in a logic subframe, system information symbol
Number repetition is transmitted secondary.
5. sending method according to claim 2, it is characterised in that in step C, the continuous pilot signal in carrier wave and
Distribution mode on symbol is：
According to logic that spectrum mode from left to right carries the lower half subband of each effective subband and upper half subband
The system information symbol of frame is individually positioned on continuous carrier wave.
6. sending method according to claim 1, it is characterised in that
The treatment of channel coding described in step A is specially convolutional encoding treatment；
The treatment of Bit Interleave described in step B specifically includes block interleaved treatment and convolutional interleave treatment；
The treatment of constellation mapping described in step B is specially the treatment of QPSK mapping modes.
7. the method according to claim 1 to 6, it is characterised in that the digital audio broadcast system is to use Fourier
The multicarrier system of conversion, Walsh conversion or wavelet transformation.
8. in a kind of digital audio broadcast system system information method of reseptance, it is characterised in that the method for reseptance includes：
A, time-domain signal is converted into frequency-region signal；
B, the position specified according to spectrum mode, extract continuous comprising system information from effective carrier wave of the frequency-region signal
Pilot tone；
C, the estimate that system information is obtained using demapping, deinterleaving and channel decoding；
D, the correctness of system information is judged using CRC decodings, according to judged result output system information；
Wherein, the system information at least include the nominal frequency point information of current sub-band, spectrum mode index information, coding information,
Modulation intelligence and CRC coding informations；
The spectrum mode is divided into A classes spectrum mode and B class spectrum modes, and the A classes spectrum mode includes 8 subbands, subband
Nominal frequency is ± (i*100+50) kHz, i=0,1,2,3, the B classes spectrum mode includes 7 subbands, the nominal frequency of subband
It is ± i*100kHz, i=0,1,2,3.
9. method of reseptance according to claim 8, it is characterised in that in step b, it is specific using include frequency diversity and when
Domain diversity carries out signal detection in interior deversity scheme to the CP continuous pilot of effective carrier wave, and extracts CP continuous pilot.
10. method of reseptance according to claim 8, it is characterised in that the decoding of channel described in step c is specially：Including
SOVA and BCJR is in the interior decoding FEC based on message transmission.
The dispensing device of system information in a kind of 11. digital audio broadcast systems, it is characterised in that the dispensing device includes：
CRC encoder, for input system information, is circulated redundancy check coding, and generation includes system information
Systematic code with check information is exported to channel encoder；
Channel encoder, for the systematic code according to input, searches out corresponding coding codeword in codeword set, and generation includes
The coded bit stream of redundancy is exported to bit interleaver；
Bit interleaver, for the coded bit stream being input into be resequenced and exported to constellation mapper according to pre-defined rule；
Constellation mapper, for the coded bit stream mapping of input to be obtained into CP continuous pilot；
Multiplexer, for the carrier wave method of salary distribution specified according to spectrum mode, by the continuous pilot signal and system other
Signal element multiple connection together, produces the frequency-region signal of orthogonal multiplex structure to export and gives time and frequency zone converter；
Time and frequency zone converter, for input frequency domain signal to be transformed into time-domain sampling for sending；
Wherein, the system information at least include the nominal frequency point information of current sub-band, spectrum mode index information, coding information,
Modulation intelligence and CRC coding informations；
The spectrum mode is divided into A classes spectrum mode and B class spectrum modes, and the A classes spectrum mode includes 8 subbands, subband
Nominal frequency is ± (i*100+50) kHz, i=0,1,2,3, the B classes spectrum mode includes 7 subbands, the nominal frequency of subband
It is ± i*100kHz, i=0,1,2,3.
12. dispensing devices according to claim 11, it is characterised in that the dispensing device is further included：
Reproducer, is arranged between the constellation mapper and multiplexer, repeats special for according to system frame structure, producing to have
The continuous pilot signal levied simultaneously is exported to multiplexer.
The reception device of system information in a kind of 13. digital audio broadcast systems, it is characterised in that the reception device includes：
When-frequency converter, for time-domain signal being converted into frequency-region signal and being exported to signal detector；
Signal detector, the system of including is extracted in the position specified according to spectrum mode from effective carrier wave of the frequency-region signal
The CP continuous pilot of information is simultaneously exported to de-mapping device；
De-mapping device, for the CP continuous pilot demapping and exports coding bit stream to deinterleaver；
Deinterleaver, for being deinterleaved to the coded bit stream and exports decoder；
Channel decoder, for carrying out channel decoding to input signal, obtains the estimate of system information and exports to give CRC decodings
Device；
CRC decoders, for judging the correctness of system information being input into, export judged result；
Wherein, wherein, the system information at least include the nominal frequency point information of current sub-band, spectrum mode index information, coding
Information, modulation intelligence and CRC coding informations；
The spectrum mode is divided into A classes spectrum mode and B class spectrum modes, and the A classes spectrum mode includes 8 subbands, subband
Nominal frequency is ± (i*100+50) kHz, i=0,1,2,3, the B classes spectrum mode includes 7 subbands, the nominal frequency of subband
It is ± i*100kHz, i=0,1,2,3.
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| CN201210293402.6A CN102957656B (en) | 2011-08-17 | 2012-08-16 | The sending and receiving methods and device of system information in digital audio broadcast system |
| PCT/CN2012/080312 WO2013023616A1 (en) | 2011-08-17 | 2012-08-17 | Method and device for sending and receiving system information in digital audio broadcast system |
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| CN201210293402.6A CN102957656B (en) | 2011-08-17 | 2012-08-16 | The sending and receiving methods and device of system information in digital audio broadcast system |
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| KR102378065B1 (en) * | 2014-07-09 | 2022-03-25 | 한국전자통신연구원 | Apparatus for transmitting broadcasting signal using layered division multiplexing and method using the same |
| CN107786304A (en) * | 2016-08-29 | 2018-03-09 | 国家新闻出版广电总局广播科学研究院 | A kind of amplitude modulation frequency band digital audio broadcast signal generation method and system |
| CN112217602B (en) * | 2019-07-12 | 2022-09-20 | 成都鼎桥通信技术有限公司 | Method, device and terminal for processing cluster voice packet |
| CN111147086B (en) * | 2019-12-26 | 2022-04-22 | 中国科学院计算技术研究所 | Code modulation method, system, medium and electronic device |
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|---|---|---|---|---|
| US6560496B1 (en) * | 1999-06-30 | 2003-05-06 | Hughes Electronics Corporation | Method for altering AC-3 data streams using minimum computation |
| CN1516459A (en) * | 2003-01-09 | 2004-07-28 | 北京泰美世纪科技有限公司 | Transferring ssytem of signal communication in digital multimedia broadcast system and mode |
| CN1960358A (en) * | 2006-10-20 | 2007-05-09 | 北京泰美世纪科技有限公司 | Digital information transmission method of a kind of multicarrier digital mobile multimedia broadcast system |
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| CN101800722B (en) * | 2009-02-11 | 2012-10-24 | 北京泰美世纪科技有限公司 | Mobile multimedia broadcast transmission system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6560496B1 (en) * | 1999-06-30 | 2003-05-06 | Hughes Electronics Corporation | Method for altering AC-3 data streams using minimum computation |
| CN1516459A (en) * | 2003-01-09 | 2004-07-28 | 北京泰美世纪科技有限公司 | Transferring ssytem of signal communication in digital multimedia broadcast system and mode |
| CN1960358A (en) * | 2006-10-20 | 2007-05-09 | 北京泰美世纪科技有限公司 | Digital information transmission method of a kind of multicarrier digital mobile multimedia broadcast system |
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