CN102857314B - Multi-frequency-point cooperative work sending and receiving method and system thereof for digital audio broadcasting signal - Google Patents
Multi-frequency-point cooperative work sending and receiving method and system thereof for digital audio broadcasting signal Download PDFInfo
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- CN102857314B CN102857314B CN201110240315.XA CN201110240315A CN102857314B CN 102857314 B CN102857314 B CN 102857314B CN 201110240315 A CN201110240315 A CN 201110240315A CN 102857314 B CN102857314 B CN 102857314B
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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
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/71—Wireless systems
- H04H20/72—Wireless systems of terrestrial networks
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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
- H04L5/0001—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
- H04L5/0012—Hopping in multicarrier systems
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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
- H04L5/0037—Inter-user or inter-terminal allocation
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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
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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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
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0093—Point-to-multipoint
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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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0096—Indication of changes in allocation
- H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
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Abstract
Disclosed is a multi-frequency-point cooperative work sending method for a digital audio broadcasting signal. The method includes the following steps that a digital audio broadcast data flow of each digital radio station is divided into a plurality of auxiliary data flows according to specific time length by a send end; a specific working frequency point sequence is set for the auxiliary data flows of each digital radio station, so that the auxiliary data flows which are sent by different digital radio stations at the same time can not appear on same working frequency point, multi-frequency-point working information of next auxiliary data flow is inserted into the auxiliary data flows which are sent by each digital radio station on current working frequency point, and the digital audio broadcast data flow of each digital radio station is circularly modulated and sent on the working frequency point sequence which the digital audio broadcast data flow corresponds to. A corresponding receiving method, a sending system and a receiving system are further provided. By means of the multi-frequency-point cooperative work sending and receiving method and the system thereof for the digital audio broadcasting signal, the spectrum utilization can be improved, the method and the system are compatible with existing frequency planning constraints, simultaneously the frequency diversity gain is achieved, and thereby the effective coverage of a radio broadcasting system is improved.
Description
Technical field
The present invention relates to a kind of sending, receiving method and system thereof of digital audio broadcasting signal, be particularly related to a kind of sending method, method of reseptance and system thereof of digital audio broadcasting signal of multifrequency point collaborative work, be applicable to the ANTENN AUDIO digit broadcasting system including ground, satellite etc.
Background technology
The maximum feature of wireless digital broadcasting system is that its broad covered area, geographical environment are various, the characteristic of channel is complicated and changeable, Noise and Interference situation is serious, and in order to ensure effective covering and the transmitting of signal, wireless digital broadcasting system must fully adapt to severe transmission channel characteristic.Signal diversifying technology, such as frequency diversity, be that signal is transmitted in the frequency band of channel coherence bandwidth at one, is the effective means that overcomes wireless channel multipath and frequency selective fading.But different wireless systems is shared radio spectrum resources must carry out strict frequency planning, new wireless transmitting system also must be considered and original system and frequency planning compatibility, to ensure the smooth evolution of new technology.Therefore,, in the time of a new wireless transmitting system of design, usually to face the contradiction of transmission bandwidth demand and frequency planning compatibility.Taking digital audio broadcast system as example, for the frequency planning compatibility that ensures to broadcast with original simulation FM/AM, Digital Audio Transmission technology all adopts narrow band transmission scheme as the HD-Radio of the U.S. and European DRM, system does not possess frequency diversity gain, to the ability of anti-multipath and decline, cause signal to cover not ideal enough.By contrast, another kind of digital audio broadcasting DAB system, signal transmission bandwidth is 1.536MHz, realize to a certain extent frequency diversity, therefore the ability of system counter multipath and decline significantly improves, and signal covers and correspondingly also improves, still, the frequency planning of DAB and original FM/AM is incompatible, and the popularization to DAB system and use have caused certain obstacle.
In existing broadcast system, each digital program sends at a fixing frequency location, due to the restriction of existing frequency planning, such as in digital audio broadcast system, owing to will ensureing and the frequency planning compatibility of original simulation FM/AM, each channel digital audio can only take a narrower bandwidth, and FM is 100KHz or 200KHz, and AM is 9KHz or 10KHz.The major defect of this broadcasting scheme is, due to spatial characteristic and the multipath fading of radio wave, cause the signal strength signal intensity (or carrier-to-noise ratio) of diverse location in overlay area widely different, even if in the geographical position close to from transmitting station, also likely cause signal quality lower than demodulation threshold because of the frequency selective fading of multipath.In order to ensure desirable covering, can only pass through to increase the power of transmitting station, or mend some devices by increase and improve, this gives again and disturbs control, frequency planning and network to set up the new problem of having brought.The fading characteristic of wireless signal is also embodied in, at the different frequent points in same geographical position, the signal quality difference of reception is very large, and some frequency cannot receive enough good signal and carry out demodulation, but in same position, some frequency but can receive very strong signal.
Summary of the invention
In view of this, the present invention proposes a kind of sending, receiving method and system thereof of digital audio broadcasting signal of multifrequency point collaborative work, to improve spectrum utilization efficiency, ensure under the prerequisite of the existing frequency planning constraint of compatibility, realize frequency diversity gain, improve the ability of multipath fading in system counter wireless transmission, thereby improve effective covering of wireless broadcast system.
The sending method that the present invention proposes a kind of digital audio broadcasting signal of multifrequency point collaborative work, comprises the steps:
Step 1: transmitting terminal is divided into multiple sub data flows by the digital audio broadcasting data flow in each digital broadcasting radio station according to specific time span;
Step 2: for the sub data flow in each digital broadcasting radio station arranges specific working frequency points sequence, so that different digital broadcasting station at one time in send sub data flow do not appear in same working frequency points, in the sub data flow sending for each digital broadcasting radio station, insert the multifrequency point job information of next sub data flow in current working frequency;
Step 3: the digital audio broadcasting data flow in each digital broadcasting radio station is sent in its corresponding working frequency points sequence cocycle modulation.
Preferably, described multifrequency point job information comprises multifrequency point cooperative work mode and multifrequency point collaborative work frequency.
Preferably, the digital audio broadcasting data flow in described each digital broadcasting radio station can be according to specific frame structure transmission, described frame structure is superframe structure, described superframe comprises 4 physical layer signal frames, each physical layer signal frame comprises 4 subframes, each subframe comprises 1 beacon and multiple OFDM symbol, in each subframe, comprises system information, and in described frame structure, in each superframe, the working frequency points of first subframe of first physical layer signal frame remains and immobilizes.
Especially, in described system information, comprise 1 bit information for representing that the instruction of multifrequency point cooperative work mode and 9 bit informations are for representing next subframe multifrequency point collaborative work frequency.
Especially, between described multiple subframes, be provided with certain stepped-frequency interval, in order to ensure that there are enough frequency settling times sending and receiving end in frequency jump procedure.
The present invention also proposes a kind of method of reseptance of digital audio broadcasting signal of multifrequency point collaborative work, comprises the steps:
Step 1: transmit regularly and carrier frequency synchronization at receiving terminal;
Step 2: to the signal after synchronous, extract the multifrequency point job information of next son data flow, and send described multifrequency point job information to working frequency points configuration module;
Step 3: working frequency points configuration module receives the reception working frequency points of mode of operation and next son data flow according to received multifrequency point job information configuration.
Preferably, described step 2 also comprises: to the signal after synchronous, convert by frequency domain, carry out channel estimating and equilibrium.
Preferably, described sub data flow comprises subframe, in described subframe, comprises system information; From the system information of described subframe, extract multifrequency point job information, described multifrequency point job information comprises multifrequency point cooperative work mode and multifrequency point collaborative work frequency.
The transmitting system that the invention also proposes a kind of digital audio broadcasting signal of multifrequency point collaborative work comprises:
Working frequency points sequence generation module, is used to the sub data flow in each digital broadcasting radio station that specific working frequency points sequence is set so that different digital broadcasting station at one time in send sub data flow do not appear in same working frequency points;
Data scrambling module, for carrying out scrambling by the data flow in each digital broadcasting radio station;
Channel interleaving and coding module, for the data flow through scrambling is carried out to channel interleaving and coding, and make the length of an encoding block can cross over multiple working frequency points;
Transmitting terminal time block, for timing and control the process of framing;
Physical layer becomes frame module, be used for the digital audio broadcasting data stream modulates in each digital broadcasting radio station in the different subframes of physical layer frame structure and together with frame head multiple connection, to form complete frame data, in described subframe, comprise the working frequency points information of next subframe;
Carrier modulation module is carried out carrier modulation by the data in each digital broadcasting radio station according to specific working frequency points sequence in corresponding subframe;
Close road module, the data in each digital broadcasting radio station are closed to road, signal amplification and transmitting.Preferably, described multifrequency point job information comprises multifrequency point cooperative work mode and multifrequency point collaborative work frequency.
Preferably, the digital audio broadcasting data flow in described each digital broadcasting radio station can be according to specific frame structure transmission, described frame structure is superframe structure, described superframe comprises 4 physical layer signal frames, each physical layer signal frame comprises 4 subframes, each subframe comprises 1 beacon and multiple OFDM symbol, in each subframe, comprises system information, and in described frame structure, in each superframe, the working frequency points of first subframe of first physical layer signal frame remains and immobilizes.
Especially, in described system information, comprise 1 bit information for representing that the instruction of multifrequency point cooperative work mode and 9 bit informations are for representing next subframe multifrequency point collaborative work frequency.
Especially, between described multiple subframes, be provided with certain stepped-frequency interval, in order to ensure that there are enough frequency settling times sending and receiving end in frequency jump procedure.
The receiving system that the invention allows for a kind of digital audio broadcasting signal of multifrequency point collaborative work, comprising:
Working frequency points configuration module, for configuring the reception working frequency points of receiving mode and next subframe according to received multifrequency point job information;
Timing and estimating carrier frequencies module, for obtaining and timing and the carrier frequency synchronization of transmitting by beacon signal at receiving terminal;
System information data symbol extraction module, for extraction system information;
Deinterleaving and folding coding module, thus system information is carried out to deinterleaving and folding coding acquisition multifrequency point job information, and send to working frequency points configuration module.
Preferably, described receiving system also comprise channel estimation and equalization module, for the signal to after synchronous, convert by frequency domain, carry out channel estimating and data balancing.
Preferably, described multifrequency point job information comprises multifrequency point cooperative work mode and multifrequency point collaborative work frequency.
Brief description of the drawings
The present invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments obviously and easily and understand, wherein:
Fig. 1 is the schematic diagram of multifrequency point collaborative work of the present invention;
Fig. 2 is for being suitable for digital audio broadcasting signal frame structure schematic diagram of the present invention;
Fig. 3 is the structure chart of transmitting system of the present invention;
Fig. 4 is another structure chart of transmitting system of the present invention;
Fig. 5 is encoder for convolution codes structural representation;
Fig. 6 is constellation mapping schematic diagram;
Fig. 7 is the flow chart of receiving system of the present invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by describing embodiments of the invention with reference to accompanying drawing as an example of digital audio broadcasting example, this explanation is exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
According to one embodiment of present invention, provide a kind of sending method of digital audio broadcasting signal of multifrequency point collaborative work, comprised the steps:
Step 1: transmitting terminal is divided into multiple sub data flows by the digital audio broadcasting data flow in each digital broadcasting radio station according to specific time span;
Step 2: for the sub data flow in each digital broadcasting radio station arranges specific working frequency points sequence, so that different digital broadcasting station at one time in send sub data flow do not appear in same working frequency points, in the sub data flow sending for each digital broadcasting radio station, insert the multifrequency point job information of next sub data flow in current working frequency;
Step 3: the digital audio broadcasting data flow in each digital broadcasting radio station is sent in its corresponding working frequency points sequence cocycle modulation.
Fig. 1 is the schematic diagram of the multifrequency point collaborative work of the embodiment of the present invention, so that being set, 4 digital audio broadcasting stations switch to mutually example in 4 working frequency points, different from conventional transmission mode, numeral platform 1 is not only to transmit at a fixing frequency location 1, but carry out the switching of one action frequency with the working frequency points order of a setting in several frequency positions, as in Fig. 1, the working frequency points order of digital platform 1 is frequency 1-> frequency 3-> frequency 2-> frequency 4.Conventionally, this working frequency points sequence is a periodic sequence, and transmits in each working frequency points the time of regular length.Also in same operating frequency set, carry out frequency switching in this transmission in other digital broadcasting radio station simultaneously, as in Fig. 1, the working frequency points order of digital platform 2 is frequency 2-> frequency 1-> frequency 4-> frequency 3.Adopt many working frequency points, each digital audio broadcasting radio station data is modulated transmission in different working frequency points, because different working frequency points experiences separately independently frequency selective fading, realize frequency diversity, thereby increased substantially the ability of receiving terminal contrary frequency selectivity decline.In addition, the service data information that each digital audio broadcasting radio station sends can adopt identical or different modulation system and code rate on different operating frequency, to meet the frequency planning requirement of place frequency band.Wherein, the working frequency points sequence of each is mutually orthogonal, can reduce like this phase mutual interference between program, ensures the frequency spectrum utilization rate of system, and can reuse substantially frequency resource.Described working frequency points order is cycle repetitive sequence, and it can be fixed configurations, also can be dynamic change in program transmission process.
Described multifrequency point job information comprises multifrequency point cooperative work mode and multifrequency point collaborative work frequency.The digital audio broadcasting data flow in described each digital broadcasting radio station can be according to specific frame structure transmission, shown in Fig. 2, described frame structure is superframe structure, each physical layer superframe length is 2560ms, the physical layer signal frame that each superframe is 640ms by 4 length forms, each signal frame comprises the subframe that 4 length are 160ms, and each subframe comprises that 1 beacon has the synchronous of enough frequency settling times and accessory terminal reception for ensureing digital audio broadcast system at operating frequency handoff procedure; And multiple OFDM symbols.In each subframe, comprise system information.The system information of carrying in the known sub-carrier positions of each OFDM symbol in each subframe especially, is as shown in table 1.Wherein comprise 1 bit information for representing that multifrequency point cooperative work mode instruction and 9 bit informations are for representing next subframe multifrequency point collaborative work frequency, respectively by the b of table 2
0and b
1～b
9instruction, is used for accessory terminal to complete signal under multifrequency point cooperative work mode and receive.
| Bit | Information is described |
| b 0 | The instruction of multifrequency point cooperative work mode |
| b 1～b 9 | Next subframe multifrequency point collaborative work frequency |
| b 10～b 13 | Current subband nominal frequency |
| b 14～b 19 | Spectrum mode index |
| b 20～b 26 | Retain Rfa |
| b 27～b 29 | CRC check position |
| b 30～b 35 | Retain Rfu |
Table 1. information bits is described
In the time that multiple digital audio broadcastings radio station works in multifrequency point cooperative work mode, in each superframe in each digital audio broadcasting radio station, the working frequency points of first subframe of first physical layer signal frame remains and immobilizes, and therefore in the present embodiment, multifrequency point collaborative work maximum can be supported 16 working frequency points.The system information that the frequency of other subframes in physical layer signal frame can be carried by previous subframe successively obtains.
Especially, between described multiple subframes, be provided with certain stepped-frequency interval, in order to ensure that there are enough frequency settling times sending and receiving end in frequency jump procedure.
The invention allows for a kind of transmitting system based on above-mentioned sending method, Fig. 3 is the structure chart of transmitting system of the present invention, working frequency points sequence generation module 100, be used to the sub data flow in each digital broadcasting radio station that specific working frequency points sequence is set so that digital broadcasting radio station 1 to n at one time in send sub data flow do not appear in same working frequency points, each digital program source traffic 101-1 in digital broadcasting radio station 1 to n, 101-2, ... first ..101-n carries out scrambling by data scrambling module 102, then the program data of scrambling is carried out to channel interleaving and coding by channel interleaving and coding module 103, program data after encoded transfers to physical layer to become frame module 104 to carry out framing by frame structure as shown in Figure 2, physical layer become frame module 104 for the digital audio broadcasting data stream modulates in each digital broadcasting radio station that channel interleaving is exported with coding module 103 in the different subframes of physical layer frame structure and together with frame head multiple connection, form complete frame data, in described subframe, comprise the working frequency points information of next subframe.Transmitting terminal time block 105, is used for timing control the process of framing.The signal frame structure of corresponding each digital broadcasting radio station data in corresponding working frequency points, is carried out carrier modulation according to the instruction of working frequency points sequence by carrier modulation module 106.The data in each digital broadcasting radio station can so be carried out separately independently carrier modulation, and the data ECDC road module 107 in final multiple digital broadcastings radio station is closed road, and signal amplifies and sends.
Adopt many working frequency points, each digital audio broadcasting radio station data is modulated transmission in different working frequency points, because different working frequency points experiences separately independently frequency selective fading, realize frequency diversity, thereby increased substantially the ability of receiving terminal contrary frequency selectivity decline.In addition, the service data information that each digital audio broadcasting radio station sends can adopt identical or different modulation system and code rate on different operating frequency, to meet the frequency planning requirement of place frequency band.Wherein, the working frequency points sequence of each is mutually orthogonal, can reduce like this phase mutual interference between program, ensures the frequency spectrum utilization rate of system, and can reuse substantially frequency resource.Described working frequency points order is cycle repetitive sequence, and it can be fixed configurations, also can be dynamic change in program transmission process.
In addition, described multifrequency point job information comprises multifrequency point cooperative work mode and multifrequency point collaborative work frequency.The digital audio broadcasting data flow in described each digital broadcasting radio station can be according to specific frame structure transmission, shown in Fig. 2, described frame structure is superframe structure, each physical layer superframe length is 2560ms, the physical layer signal frame that each superframe is 640ms by 4 length forms, each signal frame comprises the subframe that 4 length are 160ms, and each subframe comprises that 1 beacon has the synchronous of enough frequency settling times and accessory terminal reception for ensureing digital audio broadcast system at operating frequency handoff procedure; And multiple OFDM symbols.In each subframe, comprise system information.The system information of carrying in the known sub-carrier positions of each OFDM symbol in each subframe especially, is as shown in table 1.Wherein comprise 1 bit information for representing that multifrequency point cooperative work mode instruction and 9 bit informations are for representing next subframe multifrequency point collaborative work frequency, respectively by the b of table 2
0and b
1～b
9instruction, is used for accessory terminal to complete signal under multifrequency point cooperative work mode and receive.
In the time that multiple digital audio broadcastings radio station works in multifrequency point cooperative work mode, in each superframe in each digital audio broadcasting radio station, the working frequency points of first subframe of first physical layer signal frame remains and immobilizes, and therefore in the present embodiment, multifrequency point collaborative work maximum can be supported 16 working frequency points.The system information that the frequency of other subframes in physical layer signal frame can be carried by previous subframe successively obtains.
Especially, between described multiple subframes, be provided with certain stepped-frequency interval, in order to ensure that there are enough frequency settling times sending and receiving end in frequency jump procedure.
More specifically, shown in Fig. 4, first transmitting terminal converts the business datum of digital audio broadcasting signal after bit stream to, carries out scrambler; Then the bits of traffic data stream after scrambler is carried out to LDPC coding; Bits of traffic data after LDPC coding is flow to planetary mapping; To carrying the subcarrier of business datum after constellation mapping, taking subcarrier as unit, interweave, form the business datum subcarrier after interweaving; Transmitting terminal converts to after bit stream the business description information of digital audio broadcasting signal, carries out scrambler; Then the business description message bit stream after scrambler is carried out to convolutional encoding; Business description message bit stream after coding is interweaved; Business description message bit stream after Bit Interleave is carried out to constellation mapping, form business description information subcarrier; Transmitting terminal is to physical layer system information according to specific format, and composition system information bit streams, then carries out convolutional encoding; System information bit streams after coding is carried out to Bit Interleave; System information bit streams after Bit Interleave is carried out to constellation mapping, construction system information subcarrier; Afterwards, frequency domain generates scattered pilot, then, with together with business description information subcarrier and the multiple connection of system information subcarrier after business datum subcarrier, constellation mapping after above-mentioned interweaving, is mapped on corresponding spectrum mask composition OFDM frequency domain symbol; By IFFT converter by above-mentioned frequency-domain OFDM sign reversing to time domain, simultaneously multiple connection cocycle prefix, produces OFDM time-domain symbol; By the multiple connection of above-mentioned multiple OFDM time-domain symbol together, and insert beacon, carry out framing, afterwards physical layer superframe is sent the data in multiple digital broadcastings radio station after carrier modulation.
Wherein, the chnnel coding of system information bit streams adopts 1/4 convolution code that constraint length is 7, and the octal system generator polynomial corresponding to encoder of convolution code is: 133,171,145,133, and shift register initial value is complete " 0 ".System information shown in every 36 tables 2 is independently carried out convolutional encoding.Please refer to shown in Fig. 5, is encoder for convolution codes structural representation:
System information through convolutional encoding adopts Bit Interleave, interweaves and carries out taking interleaving block as unit, and its algorithm that interweaves is as follows: for the list entries before interweaving
wherein N
mUXfor the length of interleaving block, after described interleaver interweaves, output sequence is
wherein z '
n=z
r (n), R (n) obtains in the following way:
Wherein, p (0)=0, p (i)=(5 × p (i-1)+q) mods, (i ≠ 0),
q=s/4-1.
The fixing QPSK mapping mode that adopts of system information.Bit stream v after Bit Interleave
0, v
1, v
2... be mapped as QPSK symbol stream and send, various sign map add the power normalization factor, make the average power of various sign map convergent.
In planisphere, comprise power normalization factor-beta, when QPSK mapping
referring to Fig. 6, it is constellation mapping schematic diagram.
Further, the present invention proposes the corresponding method of reseptance of a kind of and above-mentioned sending method, comprises the steps:
Step 1: transmit regularly and carrier frequency synchronization at receiving terminal;
Step 2: to the signal after synchronous, extract the multifrequency point job information of next son data flow, and send described multifrequency point job information to working frequency points configuration module;
Step 3: working frequency points configuration module receives the reception working frequency points of mode of operation and next son data flow according to received multifrequency point job information configuration.
Preferably, described step 2 also comprises: to the signal after synchronous, convert by frequency domain, carry out channel estimating and equilibrium.
Preferably, described sub data flow comprises subframe, in described subframe, comprises system information; From the system information of described subframe, extract multifrequency point job information, described multifrequency point job information comprises multifrequency point cooperative work mode and multifrequency point collaborative work frequency.
Referring to Fig. 7, the invention allows for the corresponding receiving system of a kind of and above-mentioned transmitting system, comprise, working frequency points configuration module 201, for configuring the reception working frequency points of receiving mode and next son data flow according to received multifrequency point job information; Timing and estimating carrier frequencies module 202, for obtaining and timing and the carrier frequency synchronization of transmitting by beacon signal at receiving terminal; System information data symbol extraction module 204, for extraction system information; Deinterleaving and folding coding module 205, carry out deinterleaving and folding coding and obtain multifrequency point job information system information, and sending to subframe frequency configuration module.
Preferably, described receiving system also comprise channel estimation and equalization module 203, for the signal to after synchronous, convert by frequency domain, carry out channel estimating and data balancing.
Preferably, described multifrequency point job information comprises multifrequency point cooperative work mode and multifrequency point collaborative work frequency.
The present invention can improve spectrum utilization efficiency, ensures, under the prerequisite of the existing frequency planning constraint of compatibility, to realize frequency diversity gain, improves the ability of multipath fading in system counter wireless transmission, thereby improves effective covering of wireless broadcast system.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, amendment, replacement and modification to these embodiment, scope of the present invention is by claims and be equal to and limit.
Claims (21)
1. a sending method for the digital audio broadcasting signal of multifrequency point collaborative work, is characterized in that, comprises the steps:
Step 1: transmitting terminal is divided into multiple sub data flows by the digital audio broadcasting data flow in each digital broadcasting radio station according to specific time span;
Step 2: for the sub data flow in each digital broadcasting radio station arranges specific working frequency points sequence, so that different digital broadcasting station at one time in send sub data flow do not appear in same working frequency points, in the sub data flow sending for each digital broadcasting radio station, insert the multifrequency point job information of next sub data flow in current working frequency;
Step 3: the digital audio broadcasting data flow in each digital broadcasting radio station is sent in its corresponding working frequency points sequence cocycle modulation.
2. a sending method for the digital audio broadcasting signal of multifrequency point collaborative work as claimed in claim 1, is characterized in that, described multifrequency point job information comprises multifrequency point cooperative work mode and multifrequency point collaborative work frequency.
3. a sending method for the digital audio broadcasting signal of multifrequency point collaborative work as claimed in claim 1, is characterized in that, the digital audio broadcasting data flow in described each digital broadcasting radio station can be according to specific frame structure transmission.
4. the sending method of the digital audio broadcasting signal of multifrequency point collaborative work as claimed in claim 3, it is characterized in that, described frame structure is superframe structure, described superframe comprises 4 physical layer signal frames, each physical layer signal frame comprises 4 subframes, each subframe comprises 1 beacon and multiple OFDM symbol, in each subframe, comprises system information.
5. a sending method for the digital audio broadcasting signal of multifrequency point collaborative work as claimed in claim 4, is characterized in that, in described frame structure, in each superframe, the working frequency points of first subframe of first physical layer signal frame remains and immobilizes.
6. the sending method of the digital audio broadcasting signal of a multifrequency point collaborative work as claimed in claim 4, it is characterized in that, in described system information, comprise 1 bit information for representing that the instruction of multifrequency point cooperative work mode and 9 bit informations are for representing next subframe multifrequency point collaborative work frequency.
7. the sending method of the digital audio broadcasting signal of a multifrequency point collaborative work as claimed in claim 4, it is characterized in that, between described multiple subframe, be provided with certain stepped-frequency interval, in order to ensure that there are enough frequency settling times sending and receiving end in frequency jump procedure.
8. a method of reseptance for the digital audio broadcasting signal of multifrequency point collaborative work, is characterized in that, comprises the steps:
Step 1: transmit regularly and carrier frequency synchronization at receiving terminal;
Step 2: to the signal after synchronous, extract the multifrequency point job information of next son data flow, and send described multifrequency point job information to working frequency points configuration module;
Step 3: working frequency points configuration module receives the reception working frequency points of mode of operation and next son data flow according to received multifrequency point job information configuration.
9. a method of reseptance for the digital audio broadcasting signal of multifrequency point collaborative work as claimed in claim 8, is characterized in that, described step 2 also comprises: to the signal after synchronous, convert by frequency domain, carry out channel estimating and equilibrium.
10. a method of reseptance for the digital audio broadcasting signal of multifrequency point collaborative work as claimed in claim 8, is characterized in that, described sub data flow comprises subframe, in described subframe, comprises system information.
The method of reseptance of the digital audio broadcasting signal of 11. 1 kinds of multifrequency point collaborative works as claimed in claim 10, it is characterized in that, from the system information of described subframe, extract multifrequency point job information, described multifrequency point job information comprises multifrequency point cooperative work mode and multifrequency point collaborative work frequency.
The transmitting system of the digital audio broadcasting signal of 12. 1 kinds of multifrequency point collaborative works, is characterized in that, comprising:
Working frequency points sequence generation module, is used to the sub data flow in each digital broadcasting radio station that specific working frequency points sequence is set so that different digital broadcasting station at one time in send sub data flow do not appear in same working frequency points;
Data scrambling module, for carrying out scrambling by the data flow in each digital broadcasting radio station;
Channel interleaving and coding module, for the data flow through scrambling is carried out to channel interleaving and coding, and make the length of an encoding block can cross over multiple working frequency points;
Transmitting terminal time block, for timing and control the process of framing;
Physical layer becomes frame module, be used for the digital audio broadcasting data stream modulates in each digital broadcasting radio station in the different subframes of physical layer frame structure and together with frame head multiple connection, to form complete frame data, in described subframe, comprise the working frequency points information of next subframe;
Carrier modulation module is carried out carrier modulation by the data in each digital broadcasting radio station according to specific working frequency points sequence in corresponding subframe;
Close road module, the data in each digital broadcasting radio station are closed to road, signal amplification and transmitting.
The transmitting system of the digital audio broadcasting signal of 13. 1 kinds of multifrequency point collaborative works as claimed in claim 12, is characterized in that, described multifrequency point job information comprises multifrequency point cooperative work mode and multifrequency point collaborative work frequency.
The transmitting system of the digital audio broadcasting signal of 14. 1 kinds of multifrequency point collaborative works as claimed in claim 12, is characterized in that, the digital audio broadcasting data flow in described each digital broadcasting radio station can be according to specific frame structure transmission.
The transmitting system of the digital audio broadcasting signal of 15. 1 kinds of multifrequency point collaborative works as claimed in claim 14, it is characterized in that, described frame structure is superframe structure, described superframe comprises 4 physical layer signal frames, each physical layer signal frame comprises 4 subframes, each subframe comprises 1 beacon and multiple OFDM symbol, in each subframe, comprises system information.
The transmitting system of the digital audio broadcasting signal of 16. 1 kinds of multifrequency point collaborative works as claimed in claim 15, is characterized in that, in described frame structure, in each superframe, the working frequency points of first subframe of first physical layer signal frame remains and immobilizes.
The transmitting system of the digital audio broadcasting signal of 17. 1 kinds of multifrequency point collaborative works as claimed in claim 15, it is characterized in that, in described system information, comprise 1 bit information for representing that the instruction of multifrequency point cooperative work mode and 9 bit informations are for representing next subframe multifrequency point collaborative work frequency.
The transmitting system of the digital audio broadcasting signal of 18. 1 kinds of multifrequency point collaborative works as claimed in claim 15, it is characterized in that, between described multiple subframe, be provided with certain stepped-frequency interval, in order to ensure that there are enough frequency settling times sending and receiving end in frequency jump procedure.
The receiving system of the digital audio broadcasting signal of 19. 1 kinds of multifrequency point collaborative works, is characterized in that, comprising:
Working frequency points configuration module, for configuring the reception working frequency points of receiving mode and next subframe according to received multifrequency point job information;
Timing and estimating carrier frequencies module, for obtaining and timing and the carrier frequency synchronization of transmitting by beacon signal at receiving terminal;
System information data symbol extraction module, for extraction system information;
Deinterleaving and folding coding module, thus system information is carried out to deinterleaving and decoding acquisition multifrequency point job information, and send to working frequency points configuration module.
20. 1 kinds of receiving systems of the digital audio broadcasting signal of multifrequency point collaborative work as claimed in claim 19, is characterized in that, also comprise channel estimation and equalization module, for the signal to after synchronous, convert by frequency domain, carry out channel estimating and data balancing.
21. 1 kinds of receiving systems of the digital audio broadcasting signal of multifrequency point collaborative work as claimed in claim 19, is characterized in that, described multifrequency point job information comprises multifrequency point cooperative work mode and multifrequency point collaborative work frequency.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110240315.XA CN102857314B (en) | 2011-08-17 | 2011-08-17 | Multi-frequency-point cooperative work sending and receiving method and system thereof for digital audio broadcasting signal |
| PCT/CN2012/080162 WO2013023592A1 (en) | 2011-08-17 | 2012-08-15 | Method for sending and receiving digital audio broadcasting signal collaboratively working with multi-frequency point and system thereof |
| HK13103235.4A HK1176179A1 (en) | 2011-08-17 | 2013-03-15 | Method for sending and receiving digital audio broadcasting signal collaboratively working with multi-frequency point and system thereof |
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| CN201110240315.XA CN102857314B (en) | 2011-08-17 | 2011-08-17 | Multi-frequency-point cooperative work sending and receiving method and system thereof for digital audio broadcasting signal |
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| CN102857314B true CN102857314B (en) | 2014-08-27 |
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| CN (1) | CN102857314B (en) |
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| CN108282266A (en) * | 2018-01-22 | 2018-07-13 | 福建飞通通讯科技股份有限公司 | Audio signal processing method, apparatus and system |
| CN114095324B (en) * | 2021-11-09 | 2023-09-12 | 湖南省时空基准科技有限公司 | Framing method and apparatus for narrowband data broadcasting |
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| CN1764087A (en) * | 2004-10-21 | 2006-04-26 | 大唐移动通信设备有限公司 | Synchronous method for time-division duplex mobile communication system terminal working on subcarrier wave |
| CN101730257A (en) * | 2008-10-13 | 2010-06-09 | 大唐移动通信设备有限公司 | Signal transmission method, signal transmission equipment, system random access method and user equipment |
| WO2011047619A1 (en) * | 2009-10-22 | 2011-04-28 | 中国移动通信集团公司 | Method, apparatus and system for implementing carrier aggregation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19609909A1 (en) * | 1996-03-14 | 1997-09-18 | Deutsche Telekom Ag | Method and system for OFDM multicarrier transmission of digital radio signals |
| KR100594597B1 (en) * | 2003-10-24 | 2006-06-30 | 한국전자통신연구원 | Method and apparatus for embodying downlink signal in mobile communication system, and method and apparatus for synchronizing and searching cell using the same |
| KR101373187B1 (en) * | 2007-11-12 | 2014-03-14 | 삼성전자 주식회사 | Mobile terminal and method for processing multimedia message thereof |
| CN101640841B (en) * | 2008-07-31 | 2013-07-03 | 中兴通讯股份有限公司 | Method and device for allocating multimedia broadcast-multicast service resources |
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- 2011-08-17 CN CN201110240315.XA patent/CN102857314B/en active Active
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2012
- 2012-08-15 WO PCT/CN2012/080162 patent/WO2013023592A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1764087A (en) * | 2004-10-21 | 2006-04-26 | 大唐移动通信设备有限公司 | Synchronous method for time-division duplex mobile communication system terminal working on subcarrier wave |
| CN101730257A (en) * | 2008-10-13 | 2010-06-09 | 大唐移动通信设备有限公司 | Signal transmission method, signal transmission equipment, system random access method and user equipment |
| WO2011047619A1 (en) * | 2009-10-22 | 2011-04-28 | 中国移动通信集团公司 | Method, apparatus and system for implementing carrier aggregation |
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| HK1176179A1 (en) | 2013-07-19 |
| CN102857314A (en) | 2013-01-02 |
| WO2013023592A1 (en) | 2013-02-21 |
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