CN102957651B - A kind of digital audio broadcasting signal Frequency Synchronization and method of reseptance and its device - Google Patents
A kind of digital audio broadcasting signal Frequency Synchronization and method of reseptance and its device Download PDFInfo
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- CN102957651B CN102957651B CN201110240284.8A CN201110240284A CN102957651B CN 102957651 B CN102957651 B CN 102957651B CN 201110240284 A CN201110240284 A CN 201110240284A CN 102957651 B CN102957651 B CN 102957651B
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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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
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Abstract
The invention provides a kind of digital audio broadcasting signal Frequency Synchronization and method of reseptance, receiver regulation front end arranges frequency, demodulates the digital audio broadcasting signal in a subband；The spectrum mode index information adopted by the nominal frequency point information of the current sub-band that includes in extraction system information and Contemporary Digital audio broadcast signal；According to the spectrum mode index information adopted by the nominal frequency point information of the current sub-band that extracts and Contemporary Digital audio broadcast signal, receiver front end frequency point setting is adjusted, the frequency center point synchronization under Contemporary Digital audio broadcast signal spectrum mode is completed.Present invention also offers a kind of digital audio broadcasting signal Frequency Synchronization and reception device.The spectral combination pattern in Contemporary Digital audio broadcast signal can be efficiently and rapidly recognized using the method and device, realize the needs that high power capacity multi-service data is received under digital audio broadcasting.
Description
Technical field
The present invention relates to digital information transmission technical field, more particularly to DAB in digital audio broadcast system
Broadcast singal carries out Frequency Synchronization and the method and apparatus for receiving.
Background technology
Traditional FM frequency ranges (87Mhz-108Mhz) are frequency modulation broadcasting frequency ranges, and which is shared with a width of 100KHz or 200KHz,
Most basic broadcasting service can only be provided the user, what China adopted at present remains traditional analog fm broadcast.And adopt
Digital audio broadcasting provides DAB and data service, with broadcast, point to multi--point, one point-to-area, broadcast message
Cost is unrelated with number of users and tonequality is good, the quality of reception is high, strong interference immunity, transmission power are little, area coverage is big.No matter exist
Audio quality, spectrum efficiency still, in the support to new business, all have relative to traditional analog broadcasting unrivaled
Advantage.
DAB Technology main in the world at present mainly has following several：
(1) European DAB standards
Which adopts the multi-carrier broadband transmission technology based on COFDM, a set of with a carrier wave transmission in case of conventional analog broadcast
The narrow band transmission mode of program is compared, DAB technology performance in terms of frequency selective fading caused by antagonism electric wave multipath transmisstion
Greatly improve.But the channel width of DAB standards 1.536MHz is completely incompatible with simulation FM/AM broadcast, needs new work
Frequency range and frequency planning, define very big obstacle to the popularization of DAB, simultaneously because the broadband character of DAB system, terminal reception
Machine all more difficult control on cost and power consumption.
(2) United States digital audio broadcasting national standard HD Radio
Adopted by U.S. FCC approvals in 2002, its in band on channel based on iBiquity companies
(IBOC) in-band on-channel technology.Due to FCC to simulate AM and FM transmitting spectral mask require more loose, it is allowed to carrier frequency side
Carry certain radiation of power.This is based on, HD Radio are using the carrier frequency sideband transmission number for being currently assigned to AM/FM analog radios
Word audio signal, and gradually realize seamlessly transitting for simulation-to-digital.HD is promoted with the same frequency compatibility of case of conventional analog broadcast
Radio technology is promoted in the U.S. rapidly, but due in the world including some other the national AM/FM's including China
Frequency planning is different with the U.S., and corresponding spectral mask is also strictly many than the regulation of FCC, and HD Radio are using solid in addition
The technology of deckle strap and fixed edge with transmission power so that it in the application of other countries to existing simulation cover formed compared with
Big interference, it is difficult to worldwide spread.
(3)DRM
It is a kind of Mid and Short Wave Amplitude Modulation digitization program that DRM tissues are realized, it has also become ITU and etsi standard, mesh
Front DRM has issued its evolution version d RM+ again for the digital audio broadcasting of FM frequency ranges.Different from HD Radio, DRM both can be with
The up/down of occupancy analog broadcasting is faced frequency and is broadcasted, it is also possible to individually take a broadcasting channel, and this mode is more flexible,
To select digital spectrum is placed in the way of interference is minimum according to neighbouring radio station situation, and can be aided with the adjustment of transmission power, so as to
Protect existing analog broadcasting unaffected.But, all it is narrowband systems DRM system and traditional analogue audio frequency broadcast, right
In the frequency selective fading that electric wave multipath transmisstion is caused, it is impossible to realize frequency diversity, systematic function is not ideal enough.And DRM
System can only support the broadcasting channel frequency range for taking a 100khz, it is impossible to support higher business datum amount.
Therefore, how both the greatest difficulty that encounters in DAB Technology extension process is fully with advanced
Digital communication technology to improve transmission quality, and take into account the compatible and frequency planning with analog broadcasting simultaneously, to adapt to difference
The business demand of user, there is provided flexible spectral combination pattern, not only supports that the business of single 100KHz bandwidth is transmitted and can also be propped up
The flexible combination of multiple 100KHz frequency bands is held, by obtaining bigger transmission bandwidth, to support the transmission of more high data rate services
Need.And on the basis of existing FM/AM transmittings equipment, increase a small amount of equipment and a small amount of investment, so that it may realize DAB
Signal is launched with same channel with original analog broadcast signal.On the one hand original analog systemss, the opposing party is so remained
Face, it is not necessary to prepare new frequency planning, reaches the purpose of channeling.
Content of the invention
The purpose of the present invention is intended at least solve one of above-mentioned technological deficiency, especially for the number based on multifrequency spectral model
Word audio droadcasting system, the present invention propose a kind of digital audio broadcasting signal Frequency Synchronization and method of reseptance and its device, profit
The spectral combination pattern in Contemporary Digital audio broadcast signal can be efficiently and rapidly recognized with the method, realize that DAB is wide
Sow the needs of high power capacity multi-service data reception.
According to an aspect of the present invention, there is provided a kind of digital audio broadcasting signal Frequency Synchronization and method of reseptance, which is special
Levy and be, the method comprising the steps of：Receiver adjusts front end and arranges frequency, and the DAB demodulated in a subband is wide
Broadcast signal；The nominal frequency point information of the current sub-band that includes in extraction system information and Contemporary Digital audio broadcast signal are adopted
Spectrum mode index information；Adopted according to the nominal frequency point information of the current sub-band that extracts and Contemporary Digital audio broadcast signal
Spectrum mode index information, adjust receiver front end frequency point setting, complete under Contemporary Digital audio broadcast signal spectrum mode
Frequency center point synchronization.
Also include following step after frequency center point synchronization in the case where Contemporary Digital audio broadcast signal spectrum mode is completed
Suddenly：Reception and demodulation to data on all effective subbands under current spectral pattern.
Digital audio broadcasting signal in one subband is the digital audio broadcasting signal in 100KHz frequency bands.
The digital audio broadcasting signal includes A classes spectrum mode and B class spectrum modes；Wherein A classes spectrum mode includes 8
Individual subband, the nominal frequency of subband be ± (i*100+50) kHz, i=0,1,2,3；B classes spectrum mode includes 7 subbands, subband mark
Frequency is called ± i*100kHz, i=0,1,2,3.
The spectrum mode includes 39, and the system information includes that 6 bit informations are indexed for representing spectrum mode,
Wherein spectrum mode index 1-8 is cardinar number word pattern, and spectrum mode index 9-21 is that stereo fm is same broadcasts pattern, spectrum mode
Index 22-39 is that mono FM is same broadcasts pattern；Spectrum mode index 1,3,5,7,10,14,15,18,22,24,25,26,29,
30,32,33,38 is B class spectrum modes, and remaining index is A class spectrum modes；Spectrum mode indexes 1-39 and takes the right of subband
Should be related to as follows：
1 B4
2 A4A5
3 B3B4B5
4 A3A4A5A6
5 B2B3B4B5B6
6 A2A3A4A5A6A7
7 B1B2B3B4B5B6B7
8 A1A2A3A4A5A6A7A8
9 A3A4A5A6
10 B2B3B4B5B6
11 A3A4A5A6A7
12 A2A3A4A5A6
13 A2A3A4A5A6A7
14 B1B2B3B4B5B6
15 B2B3B4B5B6B7
16 A3A4A5A6A7A8
17 A1A2A3A4A5A6
18 B1B2B3B4B5B6B7
19 A2A3A4A5A6A7A8
20 A1A2A3A4A5A6A7
21 A1A2A3A4A5A6A7A8
22 B3B4B5
23 A3A4A5A6
24 B2B3B4B5
25 B3B4B5B6
26 B2B3B4B5B6
27 A2A3A4A5A6
28 A3A4A5A6A7
29 B1B2B3B4B5
30 B3B4B5B6B7
31 A2A3A4A5A6A7
32 B2B3B4B5B6B7
33 B1B2B3B4B5B6
34 A1A2A3A4A5A6
35 A3A4A5A6A7A8
36 A2A3A4A5A6A7A8
37 A1A2A3A4A5A6A7
38 B1B2B3B4B5B6B7
39 A1A2A3A4A5A6A7A8.
The system information includes 4 bits for representing the nominal frequency position of current sub-band, the nominal frequency of the subband
Position is with 50KHz as frequency steps footpath.
A kind of digital audio broadcasting signal Frequency Synchronization and reception device are provided according to another aspect of the present invention, are wrapped
Include：System information processing module, for being deinterleaved to the system information in the digital audio broadcasting signal in a subband
With decode and extract the spectrum mode index letter adopted by the nominal frequency point information of current sub-band and Contemporary Digital audio broadcast signal
Breath；Frequency and wave filter setup module, for wide according to the nominal frequency point information of the current sub-band that extracts and Contemporary Digital audio frequency
The spectrum mode index information adopted by signal is broadcast, receiver front end frequency point setting is adjusted, Contemporary Digital audio broadcasting letter is completed
Frequency center point synchronization under number spectrum mode.
Digital audio broadcasting signal in one subband is the digital broadcast signal in 100KHz frequency bands.
The frequency and wave filter setup module are additionally operable to carry out effective subband center frequency according to the frequency steps footpath of 50KHz
Arrange, and the useful signal on Current central frequency in a subband bandwidth is obtained by corresponding wave filter.
Described device also includes：Timing and Nonlinear Transformation in Frequency Offset Estimation module, for being timed and load to current sub-band signal
Ripple offset estimation；Channel estimation and equalization module, for carrying out channel estimation and number after timing and Nonlinear Transformation in Frequency Offset Estimation is obtained
According to equilibrium；Data message symbol extraction module, for carrying out valid data to the signal after channel estimation with data balancing
Symbol extraction；Deinterleave and decoding module, for obtaining the data bit information entrained by digital broadcasting.
The digital audio broadcasting signal includes A classes spectrum mode and B class spectrum modes；Wherein A classes spectrum mode includes 8
Individual subband, the nominal frequency of subband be ± (i*100+50) kHz, i=0,1,2,3；B classes spectrum mode includes 7 subbands, subband mark
Frequency is called ± i*100kHz, i=0,1,2,3.
The spectrum mode includes 39, and the system information includes that 6 bit informations are indexed for representing spectrum mode,
Wherein spectrum mode index 1-8 is cardinar number word pattern, and spectrum mode index 9-21 is that stereo fm is same broadcasts pattern, spectrum mode
Index 22-39 is that mono FM is same broadcasts pattern；Spectrum mode index 1,3,5,7,10,14,15,18,22,24,25,26,
29,30,32,33,38 is B class spectrum modes, and remaining index is A class spectrum modes；Spectrum mode index 1-39 and occupancy subband
Corresponding relation as follows：
1 B4
2 A4A5
3 B3B4B5
4 A3A4A5A6
5 B2B3B4B5B6
6 A2A3A4A5A6A7
7 B1B2B3B4B5B6B7
8 A1A2A3A4A5A6A7A8
9 A3A4A5A6
10 B2B3B4B5B6
11 A3A4A5A6A7
12 A2A3A4A5A6
13 A2A3A4A5A6A7
14 B1B2B3B4B5B6
15 B2B3B4B5B6B7
16 A3A4A5A6A7A8
17 A1A2A3A4A5A6
18 B1B2B3B4B5B6B7
19 A2A3A4A5A6A7A8
20 A1A2A3A4A5A6A7
21 A1A2A3A4A5A6A7A8
22 B3B4B5
23 A3A4A5A6
24 B2B3B4B5
25 B3B4B5B6
26 B2B3B4B5B6
27 A2A3A4A5A6
28 A3A4A5A6A7
29 B1B2B3B4B5
30 B3B4B5B6B7
31 A2A3A4A5A6A7
32 B2B3B4B5B6B7
33 B1B2B3B4B5B6
34 A1A2A3A4A5A6
35 A3A4A5A6A7A8
36 A2A3A4A5A6A7A8
37 A1A2A3A4A5A6A7
38 B1B2B3B4B5B6B7
39 A1A2A3A4A5A6A7A8.
The system information includes 4 bits for representing the nominal frequency position of current sub-band, the nominal frequency of the subband
Position is with 50KHz as frequency steps footpath.
The frequency spectrum in Contemporary Digital audio broadcast signal can be efficiently and rapidly recognized using the method for the present invention and device
Integrated mode, realizes the needs that high power capacity multi-service data is received under digital audio broadcasting.
Description of the drawings
The above-mentioned and/or additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and easy to understand, wherein：
Fig. 1 is the digital audio broadcasting signal baseband frequency spectrum schematic diagram according to the embodiment of the present invention；
Fig. 2 is the digital audio broadcasting signal spectrum mode figure according to the embodiment of the present invention；
Fig. 3 is the transmitting terminal processing data information block diagram according to the embodiment of the present invention；
Fig. 4 is the encoder for convolution codes schematic diagram according to the embodiment of the present invention；
Fig. 5 is the constellation mapping schematic diagram according to the embodiment of the present invention；
Fig. 6 is Frequency Synchronization and the method for reseptance flow chart according to the embodiment of the present invention；
Fig. 7 is the receiving terminal processing data information block diagram according to the embodiment of the present invention；
Fig. 8 is the digital audio broadcasting signal subframe structure figure according to the embodiment of the present invention；
Fig. 9 is to be sent to receive schematic diagram according to the spectrum mask of embodiment of the present invention index 3.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
Digital audio broadcast system according to embodiments of the present invention is based on OFDM (OFDM) and multiple spectra mould
The digital audio broadcast system of formula.However, the present invention is not limited to apply in an ofdm system.Fig. 1 shows that DAB is wide
The baseband frequency spectrum schematic diagram of signal is broadcast, the corresponding signal center's frequency of 0 Frequency point, the i.e. position of OFDM symbol subcarrier 0 in figure.Number
With a width of 100kHz, the digital audio broadcasting signal in subband is the numeral in 100KHz frequency bands to the name of word tone frequency broadcasting sub-band
Audio broadcast signal, it are a kind of segmentations of digital audio broadcasting signal frequency spectrum.By whole in the range of the nominal frequency ± 50kHz of subband
The component of signal of several OFDM subcarriers compositions.Digital audio broadcasting signal is by most subbands of 8 names with a width of 100kHz
Composition.Digital audio broadcasting signal includes two class spectrum modes, i.e. A classes spectrum mode and B class spectrum modes.Wherein A classes frequency spectrum
Pattern include 8 subbands, the nominal frequency of subband be ± (i*100+50) kHz, i=0,1,2,3；B classes spectrum mode includes 7 sons
Band, integral multiple of the nominal frequency of subband for 100kHz, i.e. ± i*100kHz, i=0,1,2,3.Different spectrum modes are provided
Different bandwidth combinations and the compatibility to existing analog broadcast signal.The present invention includes that 39 kinds of spectrum modes, Fig. 2 are defined altogether
Digital audio broadcasting signal allows the spectrum mode for using and corresponding spectrum mode index.Spectrum mode defines digital sound
The quantity of subband in frequency broadcast singal, a width of 50kHz of the band of every piece of frequency spectrum in spectrum mode.The block table of white in spectrum mode
Show that the frequency spectrum not taken, shaded block represent the lower half subband of an effective subband, the light grey frequency band for representing that simulation table takes.
Wherein spectrum mode index 1-8 is cardinar number word pattern, and spectrum mode index 9-21 is that stereo fm is same broadcasts pattern, spectrum mode
Index 22-39 is that mono FM is same broadcasts pattern；Spectrum mode index 1,3,5,7,10,14,15,18,22,24,25,26,29,
30,32,33,38 is B class spectrum modes, and remaining index is A class spectrum modes.Spectrum mode indexes 1-39 and takes the right of subband
Should be related to as follows：
1 B4
2 A4A5
3 B3B4B5
4 A3A4A5A6
5 B2B3B4B5B6
6 A2A3A4A5A6A7
7 B1B2B3B4B5B6B7
8 A1A2A3A4A5A6A7A8
9 A3A4A5A6
10 B2B3B4B5B6
11 A3A4A5A6A7
12 A2A3A4A5A6
13 A2A3A4A5A6A7
14 B1B2B3B4B5B6
15 B2B3B4B5B6B7
16 A3A4A5A6A7A8
17 A1A2A3A4A5A6
18 B1B2B3B4B5B6B7
19 A2A3A4A5A6A7A8
20 A1A2A3A4A5A6A7
21 A1A2A3A4A5A6A7A8
22 B3B4B5
23 A3A4A5A6
24 B2B3B4B5
25 B3B4B5B6
26 B2B3B4B5B6
27 A2A3A4A5A6
28 A3A4A5A6A7
29 B1B2B3B4B5
30 B3B4B5B6B7
31 A2A3A4A5A6A7
32 B2B3B4B5B6B7
33 B1B2B3B4B5B6
34 A1A2A3A4A5A6
35 A3A4A5A6A7A8
36 A2A3A4A5A6A7A8
37 A1A2A3A4A5A6A7
38 B1B2B3B4B5B6B7
39 A1A2A3A4A5A6A7A8.
First in transmitting terminal, as shown in figure 3, according to set digital audio broadcasting signal spectrum mode, in transmitting terminal
Being formed includes the system information of spectrum mode index and the nominal frequency point information of current sub-band；By 301 pairs of system informations of module
The mapping of chnnel coding, Bit Interleave and symbol is carried out, with the business datum through process such as scrambler, coding, intertextures, business description
Information and scattered pilot are multiplexed into formation digital audio broadcasting signal together and are transmitted.
Wherein described system information at least includes 36 bits, and the implication of each bit is as shown in table 1.In system information
With 4 bit b10～b13Define the nominal frequency position of subband of current sub-band, the nominal frequency position of the subband with 50KHz is
Frequency steps footpath, table 2 provide its corresponding relation, and with 6 bit b in system information14～b19Spectrum mode index is defined,
Table 3 provides its corresponding relation.
| Bit | Information is described |
| b0 | Multifrequency point cooperative work mode is indicated |
| b1～b9 | Next subframe multifrequency point collaborative work frequency |
| b10～b13 | The nominal frequency of current sub-band |
| b14～b19 | Spectrum mode is indexed |
| b20～b26 | Retain Rfa |
| b27～b29 | CRC check position |
| b30～b35 | Retain Rfu |
1. bit definitions of table and the corresponding relation of system information
2. bit definitions of table and the corresponding relation of the nominal frequency position of subband
The corresponding relation that 3. bit definitions of table are indexed with spectrum mode
Chnnel coding adopt constraint length for 7 1/4 convolutional code, the encoder of convolutional code as shown in figure 4, its corresponding eight
System generator polynomial is：133,171,145,133, shift register initial value is complete " 0 ".Per shown in 36 tables 1 being
System information independently carries out convolutional encoding.Front, i.e., b0 is front for the low level of system information bit streams.
Bit Interleave is adopted through the system information of convolutional encoding, interweaving is carried out in units of interleaving block, its interleaving algorithm
As follows：List entries before for intertexture areWherein NMUXLength for interleaving block is 144,
Output sequence after intertexture is：Wherein zn'=zR(n), R (n) is by such as lower section
Formula is obtained：
Wherein, p (0)=0, p (i)=(5 × p (i-1)+q) mods, (i ≠ 0),Q=s/4-1.
System information is fixed and adopts QPSK mapping modes, and mapping mode is as shown in Figure 5.Bit stream after Bit Interleave
v0,v1,v2... the transmission of QPSK symbol streams is mapped as, various symbols mapping adds the power normalization factor, maps various symbols
Mean power is convergent.
Power normalization factor-beta has been included in planisphere, when QPSK maps
In receiving terminal, digital audio broadcasting signal Frequency Synchronization according to embodiments of the present invention and method of reseptance, such as Fig. 6 institutes
Show, it comprises the steps：(1) receiver adjusts front end and arranges frequency, demodulates the digital audio broadcasting signal in a subband；
(2) frequency spectrum adopted by the nominal frequency point information of the current sub-band that includes in extraction system information and Contemporary Digital audio broadcast signal
Mode index information；(3) adopted according to the nominal frequency point information of the current sub-band that extracts and Contemporary Digital audio broadcast signal
Spectrum mode index information, adjust receiver front end frequency point setting, complete under Contemporary Digital audio broadcast signal spectrum mode
Frequency center point synchronization.
Especially, frequency center point synchronization of the methods described in the case where Contemporary Digital audio broadcast signal spectrum mode is completed
Further comprising the steps of afterwards：(4) reception and demodulation to data on all effective subbands under current spectral pattern.
Additionally, digital audio broadcasting signal Frequency Synchronization according to embodiments of the present invention and reception device, as shown in Figure 7.
Described device includes：System information processing module 410, for believing to the system in the digital audio broadcasting signal in a subband
Breath is deinterleaved and decodes and extract the frequency adopted by the nominal frequency point information of current sub-band and Contemporary Digital audio broadcast signal
Spectral model index information.Frequency and wave filter setup module 401, for according to the nominal frequency point information of the current sub-band that extracts and
The spectrum mode index information adopted by Contemporary Digital audio broadcast signal, adjusts receiver front end frequency point setting, completes current
Frequency center point synchronization under digital audio broadcasting signal spectrum mode.
Especially, the frequency and wave filter setup module 401 are additionally operable to the frequency after reception system resets according to 50KHz
Rate step footpath carries out effective subband center frequency point setting, and obtains a son on Current central frequency by corresponding wave filter
With the useful signal in bandwidth.
Described device also includes timing and Nonlinear Transformation in Frequency Offset Estimation module 402, the digital audio broadcasting which can be according to Fig. 8
Beacon signal in system subframe structure, is timed to current sub-band signal and Nonlinear Transformation in Frequency Offset Estimation.Channel estimation and equalization
Module 403, for carrying out channel estimation and data balancing after timing and Nonlinear Transformation in Frequency Offset Estimation is obtained.Data message symbol extraction
Module 407, for carrying out valid data symbol extraction to the signal after channel estimation with data balancing.De-interleaving block
408 with decoding module 409, for obtaining the data bit information entrained by digital broadcasting.
The system information processing module 410 also includes：System information symbol extraction module 404, for extract through
The data symbol of spectrum mask index and the nominal frequency point information of current sub-band is carried after data balancing.Deinterleave and folding coding
Module 405, for described carrying spectrum mask index and the nominal frequency point information data symbol of current sub-band be deinterleaved and
Decoding is so as to obtaining the bit information entrained by CP continuous pilot subcarrier.Spectrum mask and the nominal frequency point information module 406 of subband,
For according to the corresponding relation between table 1-3, obtaining the spectrum mask index and the nominal frequency of current sub-band of current Received Signal
Information, and it is sent to frequency and wave filter setup module 401.
Fig. 9 is shown with spectrum mask index 3 as the reception process schematic under spectral combination mode.To receive first
Machine center frequency point is arranged at the center of subband 1, as shown in figure 9, obtaining subband 1 by corresponding low pass filter
Useful signal.Extract entrained spectrum mask index and the nominal frequency point information of current sub-band in subband 1.Adjusted according to testing result
Whole frequency and the center of wave filter setup module to current spectral template index 3, namely the center of subband 2, and then
Demodulate the spectrum mask and index the data carried in lower 3 subbands.
As can be seen that can efficiently and rapidly recognize Contemporary Digital audio broadcast signal using the method for the present invention and device
In spectral combination pattern, realize the needs that high power capacity multi-service data under digital audio broadcasting is received.
Those skilled in the art are appreciated that to realize all or part of step that above-described embodiment method is carried
Suddenly the hardware that can be by program to instruct correlation is completed, and described program can be stored in a kind of computer-readable storage medium
In matter, the program upon execution, including one or a combination set of the step of embodiment of the method.
Additionally, each functional unit in each embodiment of the invention can be integrated in a processing module, it is also possible to
It is that unit is individually physically present, it is also possible to which two or more units are integrated in a module.Above-mentioned integrated mould
Block both can be realized in the form of hardware, it would however also be possible to employ the form of software function module is realized.The integrated module is such as
Fruit using in the form of software function module realize and as independent production marketing or use when, it is also possible to be stored in a computer
In read/write memory medium.
Storage medium mentioned above can be read only memory, disk or CD etc..
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (13)
1. a kind of digital audio broadcasting signal Frequency Synchronization and method of reseptance, it is characterised in that the method comprising the steps of：
Receiver adjusts front end and arranges frequency, demodulates the digital audio broadcasting signal in a subband；
The frequency adopted by the nominal frequency point information of the current sub-band that includes in extraction system information and Contemporary Digital audio broadcast signal
Spectral model index information；
According to the spectrum mode rope adopted by the nominal frequency point information of the current sub-band that extracts and Contemporary Digital audio broadcast signal
Fuse ceases, and adjusts receiver front end frequency point setting, completes the frequency center point under Contemporary Digital audio broadcast signal spectrum mode
Synchronous.
2. method according to claim 1, it is characterised in that in the case where Contemporary Digital audio broadcast signal spectrum mode is completed
Frequency center point synchronization after further comprising the steps of：
Reception and demodulation to data on all effective subbands under current spectral pattern.
3. method according to claim 2, it is characterised in that the digital audio broadcasting signal in one subband is
Digital audio broadcasting signal in 100kHz frequency bands.
4. method according to claim 3, it is characterised in that the digital audio broadcasting signal includes A class spectrum modes
With B class spectrum modes；Wherein A classes spectrum mode includes 8 subbands, and the nominal frequency of subband is ± (i*100+50) kHz, i=0,
1,2,3；B classes spectrum mode include 7 subbands, the nominal frequency of subband be ± i*100kHz, i=0,1,2,3.
5. method according to claim 4, wherein described spectrum mode include 39, and the system information includes 6 ratios
Special information is used for representing that spectrum mode is indexed that wherein spectrum mode to index 1-8 for cardinar number word pattern, and spectrum mode index 9-21 is
With pattern of broadcasting, spectrum mode index 22-39 is that mono FM is same broadcasts pattern to stereo fm；Spectrum mode index 1,3,5,7,
10,14,15,18,22,24,25,26,29,30,32,33,38 is B class spectrum modes, and remaining index is A class spectrum modes；Frequently
It is as follows with the corresponding relation for taking subband that spectral model indexes 1-39：
1 B4
2 A4A5
3 B3B4B5
4 A3A4A5A6
5 B2B3B4B5B6
6 A2A3A4A5A6A7
7 B1B2B3B4B5B6B7
8 A1A2A3A4A5A6A7A8
9 A3A4A5A6
10 B2B3B4B5B6
11 A3A4A5A6A7
12 A2A3A4A5A6
13 A2A3A4A5A6A7
14 B1B2B3B4B5B6
15 B2B3B4B5B6B7
16 A3A4A5A6A7A8
17 A1A2A3A4A5A6
18 B1B2B3B4B5B6B7
19 A2A3A4A5A6A7A8
20 A1A2A3A4A5A6A7
21 A1A2A3A4A5A6A7A8
22 B3B4B5
23 A3A4A5A6
24 B2B3B4B5
25 B3B4B5B6
26 B2B3B4B5B6
27 A2A3A4A5A6
28 A3A4A5A6A7
29 B1B2B3B4B5
30 B3B4B5B6B7
31 A2A3A4A5A6A7
32 B2B3B4B5B6B7
33 B1B2B3B4B5B6
34 A1A2A3A4A5A6
35 A3A4A5A6A7A8
36 A2A3A4A5A6A7A8
37 A1A2A3A4A5A6A7
38 B1B2B3B4B5B6B7
39 A1A2A3A4A5A6A7A8.
6. method according to claim 5, it is characterised in that the system information includes 4 bits for representing current
The nominal frequency position of subband, the nominal frequency position of the subband is with 50kHz as frequency steps footpath.
7. a kind of digital audio broadcasting signal Frequency Synchronization and reception device, it is characterised in that include：
System information processing module, for being deinterleaved to the system information in the digital audio broadcasting signal in a subband
With decode and extract the spectrum mode index letter adopted by the nominal frequency point information of current sub-band and Contemporary Digital audio broadcast signal
Breath；
Frequency and wave filter setup module, for wide according to the nominal frequency point information of the current sub-band that extracts and Contemporary Digital audio frequency
The spectrum mode index information adopted by signal is broadcast, receiver front end frequency point setting is adjusted, Contemporary Digital audio broadcasting letter is completed
Frequency center point synchronization under number spectrum mode.
8. device according to claim 7, it is characterised in that the digital audio broadcasting signal in one subband is
Digital broadcast signal in 100kHz frequency bands.
9. device according to claim 8, it is characterised in that the frequency and wave filter setup module be additionally operable to according to
The frequency steps footpath of 50kHz carries out effective subband center frequency point setting, and obtains Current central frequency by corresponding wave filter
Useful signal in the upper subband bandwidth of point.
10. device according to claim 8, it is characterised in that also include：
Timing and Nonlinear Transformation in Frequency Offset Estimation module, for being timed to current sub-band signal and Nonlinear Transformation in Frequency Offset Estimation；
Channel estimation and equalization module, for carrying out channel estimation and data balancing after timing and Nonlinear Transformation in Frequency Offset Estimation is obtained；
Data message symbol extraction module, for carrying out valid data symbol to the signal after channel estimation with data balancing
Extract；
Deinterleave and decoding module, for obtaining the data bit information entrained by digital broadcasting.
11. devices according to claim 8, it is characterised in that the digital audio broadcasting signal includes A class spectrum modes
With B class spectrum modes；Wherein A classes spectrum mode includes 8 subbands, and the nominal frequency of subband is ± (i*100+50) kHz, i=0,
1,2,3；B classes spectrum mode include 7 subbands, the nominal frequency of subband be ± i*100kHz, i=0,1,2,3.
12. devices according to claim 11, wherein described spectrum mode include 39, and the system information includes 6
Bit information is used for representing that spectrum mode is indexed that wherein spectrum mode to index 1-8 for cardinar number word pattern, and spectrum mode indexes 9-21
Being that stereo fm is same broadcasts pattern, and spectrum mode index 22-39 is that mono FM is same broadcasts pattern；Spectrum mode index 1,3,5,
7,10,14,15,18,22,24,25,26,29,30,32,33,38 is B class spectrum modes, and remaining index is A class spectrum modes；
It is as follows with the corresponding relation for taking subband that spectrum mode indexes 1-39：
1 B4
2 A4A5
3 B3B4B5
4 A3A4A5A6
5 B2B3B4B5B6
6 A2A3A4A5A6A7
7 B1B2B3B4B5B6B7
8 A1A2A3A4A5A6A7A8
9 A3A4A5A6
10 B2B3B4B5B6
11 A3A4A5A6A7
12 A2A3A4A5A6
13 A2A3A4A5A6A7
14 B1B2B3B4B5B6
15 B2B3B4B5B6B7
16 A3A4A5A6A7A8
17 A1A2A3A4A5A6
18 B1B2B3B4B5B6B7
19 A2A3A4A5A6A7A8
20 A1A2A3A4A5A6A7
21 A1A2A3A4A5A6A7A8
22 B3B4B5
23 A3A4A5A6
24 B2B3B4B5
25 B3B4B5B6
26 B2B3B4B5B6
27 A2A3A4A5A6
28 A3A4A5A6A7
29 B1B2B3B4B5
30 B3B4B5B6B7
31 A2A3A4A5A6A7
32 B2B3B4B5B6B7
33 B1B2B3B4B5B6
34 A1A2A3A4A5A6
35 A3A4A5A6A7A8
36 A2A3A4A5A6A7A8
37 A1A2A3A4A5A6A7
38 B1B2B3B4B5B6B7
39 A1A2A3A4A5A6A7A8.
13. devices according to claim 12, it is characterised in that the system information include 4 bits for represent ought
The nominal frequency position of front subband, the nominal frequency position of the subband is with 50kHz as frequency steps footpath.
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| CN1358367A (en) * | 1999-06-24 | 2002-07-10 | 艾比奎蒂数字公司 | Method and apparatus for determining transmission mode and synchronization for digital audio broadcasting signal |
| 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 |
| CN101114899A (en) * | 2007-06-25 | 2008-01-30 | 北京创毅视讯科技有限公司 | Beacon transmitting method in mobile multimedia broadcasting system |
| CN101674278A (en) * | 2008-09-08 | 2010-03-17 | 索尼株式会社 | New frame and data pattern structure for multi-carrier systems |
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| US7551546B2 (en) * | 2002-06-27 | 2009-06-23 | Nortel Networks Limited | Dual-mode shared OFDM methods/transmitters, receivers and systems |
| KR100620914B1 (en) * | 2004-04-07 | 2006-09-13 | 삼성전자주식회사 | Apparatus and method for switching between amc mode and diversity mode in broadband wireless communication system |
| CN101136200B (en) * | 2006-08-30 | 2011-04-20 | 财团法人工业技术研究院 | Audio signal transform coding method and system thereof |
| CN101206860A (en) * | 2006-12-20 | 2008-06-25 | 华为技术有限公司 | Method and apparatus for encoding and decoding layered audio |
| JP2009130506A (en) * | 2007-11-21 | 2009-06-11 | Panasonic Corp | Audio synchronizer for digital television broadcast |
| CN102694764B (en) * | 2011-08-17 | 2017-03-15 | 国家新闻出版广电总局广播科学研究院 | Digital audio and video signals method of sending and receiving and device in digital audio broadcast system |
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| CN1358367A (en) * | 1999-06-24 | 2002-07-10 | 艾比奎蒂数字公司 | Method and apparatus for determining transmission mode and synchronization for digital audio broadcasting signal |
| 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 |
| CN101114899A (en) * | 2007-06-25 | 2008-01-30 | 北京创毅视讯科技有限公司 | Beacon transmitting method in mobile multimedia broadcasting system |
| CN101674278A (en) * | 2008-09-08 | 2010-03-17 | 索尼株式会社 | New frame and data pattern structure for multi-carrier systems |
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