CN1553709A - Base band OQAM signal generating method in digital ground broadcasting transmission - Google Patents
Base band OQAM signal generating method in digital ground broadcasting transmission Download PDFInfo
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Abstract
This invention discloses a method for generating base band OQAM signal in the transmission of digital terrestrial broadcasting. It includes following steps: separating parity; inserting zero into dot interlacing; periodic sequence multiplying; forming filter. The two steps, separating parity and inserting zero into dot interlacing, can be removed. The input data can be multiplied by a periodic sequence directly. Then is sent into a forming filter, the odd tap of the forming filter alternatively outputs path Q and I base band signal, so as to implement path I and Q forming filter, then gets the digital base band OQAM signal. The invention can make combining usage for forming filters in the path Q and I and can also make reversion for the frequency spectrum. It is applied in various OQAM modulations, especially in the hybrid transmission system.
Description
Technical field the invention belongs to field of signal transmissions, particularly the generation method of base band OQAM signal in the DTB Digital Terrestrial Broadcasting transmission.
Background technology as shown in Figure 1, typical wireless transmitting system comprises transmitter and receiver, if tuner is arranged in the receiver, then down-conversion needn't be arranged.Digital modulation technique adds necessary supplementary, as synchronous signal, pilot signal etc. more often with encoding digital signals.Digital signal behind the coding is through forming baseband signal behind processing and the channel filtering accordingly.After being modulated onto frequency band corresponding, this baseband signal process intermediate frequency Modulation and upconverter send.At receiving terminal, tuner transforms to base band after analog to digital converter obtains digital signal with high-frequency signal.This digital signal is resumed the information consistent with transmitting terminal after handling through digital decoding.
The DTB Digital Terrestrial Broadcasting system will carry out the processing of a series of chnnel codings to the input data when transmission, comprise coding in data randomization, the outer coding of Reed-Solomon (RS), data interlacing, the employing trellis coding (TCM) (or nothing), add synchronizing signal, pilot signal, the channel shaping filter, up-conversion etc.The module and the flow process of its processing are seen Fig. 2.
In new DTB Digital Terrestrial Broadcasting system, because the diversified requirement of broadcasted application, for example TV signal is fixed reception, TV signal moves reception and data-signal moves reception etc., often requires system to contain mixed transmission modes.In order to solve the problem of various different transmission modes mixed transport in same transmission system, U.S. ATSC system arranges framing, field, segment structure with transmission signals, come indicating transmission mode and other a series of information by inserting reference signals such as frame, field, segment sync signal simultaneously, as system parameters, randomizer and the indication information etc. that resets that interweaves.
Three kinds of business of new ADTB-T system transmissions are respectively the fixing receptions of TV signal (fixed service), TV signal moves reception (mobile service) and data-signal moves reception (data service).Wherein, fixed service can be selected 16-OQAM and two kinds of modulating modes of trellis coding 64-OQAM; Mobile service can be selected 4-OQAM and two kinds of modulating modes of trellis coding 16-OQAM; The modulating mode of convolutional encoding 4-OQAM is selected in data service.
Fixed service data, mobile service data and data service data are used independently input buffer circuit, RS coding circuit, scrambler circuit, interleave circuit and trellis coding circuit.Under the close fit of multiplexer, the code check of fixed service, mobile service and data service will be mixed as required by transmission system, and by the co-ordination of each element circuit of control unit control transmission system.Control unit according to the buffer state of fixed service code stream, mobile service code stream and data service code stream in sequence with interval X-shape framing field structure.Three kinds of business modulating mode separately has similar frame, field structure, can be the unit mixed transport with the frame according to application need.
As seen from Figure 3, base band QAM and OQAM signal are complex signal, on I passage and Q passage information are arranged all.But OQAM is with the QAM difference: the symbol rate of OQAM doubles than QAM, and the OQAM signal can not occur on I passage and Q passage simultaneously, thereby greatly reduces peak-to-average force ratio.OQAM signal composition mode is different from the QAM signal to be formed, and has determined and can't generate the OQAM signal with traditional QAM signal generating mode.
The summary of the invention the technical problem to be solved in the present invention is to provide a kind of method that generates corresponding baseband signal for the pairing OQAM modulation system of mixed transmission modes DTB Digital Terrestrial Broadcasting transmission system.
The present invention generates the method for base band OQAM signal, comprises odd even separation, dot interlace zero insertion, periodic sequence multiplies each other and several steps such as shaping filter.
Digital signal under the different transmission mode is through coding, and enter the odd even separation module after adding synchronizing signal and pilot signal (below be referred to as behind the coding digital signal), this module is with any symbol in the input signal, first symbol as field synchronization, be primary sign, send into I passage and Q passage in turn according to the order of odevity, thereby the digital signal of input is divided into I, Q two-way.
The I channel signal dot interlace that previous step is formed adds " 0 " and forms the I1 signal, and the Q channel signal that previous step is formed also dot interlace adds " 0 " and forms the Q1 signal.Like this, the corresponding Q channel signal of the each point Q1 of value is arranged is 0 each point to I channel signal I1; It is 0 each point that Q channel signal Q1 has the corresponding I channel signal of the each point of value I1.
The Q1 signal of the I1 signal of I passage and Q passage is constantly begun to be multiplied by respectively 4 to be the sequence " 11-1-1 " in cycle from any one, form I2 signal and Q2 signal respectively.Then, I2 signal and Q2 signal sent into forming filter carries out low-pass filtering and sideband is shaped, can obtain base band OQAM signal.
Forming filter is designed to raised cosine roll off characteristic (PRC), and rolloff-factor is 12%.This forming filter can be each one on I road and Q road.Owing to can not occur simultaneously at synchronization I road signal and Q road signal, therefore also can carry out time division multiplexing with a filter, satisfy the requirement that two paths of signals is shaped.
The classic again up-conversion module of base band OQAM signal just can generate required intermediate-freuqncy signal.
At some network with the requirement of spectrum inversion arranged in using, if any upconverter carry the function of spectrum inversion, correspondingly, it can require intermediate-freuqncy signal also will overturn.The present invention generates in the method for base band OQAM signal, can realize making the effect of baseband frequency spectrum upset by selecting the starting point with the periodic sequence of I road signal and Q road signal multiplication.
The present invention passes through interval zero insertion on I road and Q road, and is multiplied by the mode of periodic sequence simultaneously, makes system on 1/2nd symbol rate, and having formed the relative I of signal road, Q road has half to clap the characteristic that postpones, thereby has generated base band OQAM signal.In the symbol period of 2T, the signal in the preceding T time on the I road is effective, Q road signal redundancy (being made as zero); Signal in the back T time on the Q road is effective, I road signal redundancy (being made as zero).
The present invention is the method that total digitalization generates base band OQAM signal.Base band OQAM signal with this method formation, have only wherein one road signal effectively (to be not equal to zero) on synchronization I road and the Q road, so system only need handle road signal wherein, thereby significantly reduce the complexity of handling, feasible realization is more simple, and has reduced the peak-to-average force ratio of signal.The invention enables the forming filter on I road and the Q road can merge use, saved resource more.
The inventive method can be reversed frequency spectrum easily, to satisfy the requirement of spectrum inversion.
The present invention is applicable to various OQAM modulating modes, therefore is particularly suitable for the DTB Digital Terrestrial Broadcasting transmission system of mixed transmission modes.
Description of drawings is described further the present invention below in conjunction with drawings and Examples.
Fig. 1 is the system block diagram of typical Digital Transmission.
Fig. 2 is each functional module and the flow chart of transmitting terminal in the DTB Digital Terrestrial Broadcasting system.
Fig. 3 is the I of QAM and OQAM, and the Q channel signal is formed schematic diagram.
Fig. 4 generates the first embodiment functional block diagram of base band OQAM signal for the present invention.
Fig. 5 generates the second embodiment functional block diagram of base band OQAM signal for the present invention.
Fig. 6 is the frequency spectrum of base band OQAM signal in the Digital Television Terrestrial Broadcasting transmission.
Behind input data process data randomization under each transmission mode of embodiment, the outer coding of Reed-Solomon (RS), data interlacing, the interior coding of employing trellis coding (TCM) (or nothing), be mapped to 2 level, 4 level or 8 level according to modulating mode: under the trellis coding 64-OQAM modulating mode, each data symbol is 3 bits, 8 level symbols; Under the 16-OQAM modulating mode, each data symbol is 2 bits, 4 level symbols; Under the trellis coding 16-OQAM modulating mode, each data symbol is 2 bits, 4 level symbols; Under the 4-OQAM modulating mode, each data symbol is 1 bit, 2 level symbols; Under the convolutional encoding 4-OQAM modulating mode, each data symbol is 1 bit, 2 level symbols.Then, add synchronizing signal and pilot signal again, form the digital signal after encoding.
The process that Benq's band OQAM signal forms referring now to Fig. 4.
Digital signal behind the coding is divided into 2 the tunnel through the odd even separating treatment, is respectively I passage and Q passage.Can be with any symbol, as first symbol of field synchronization, as first sign-on, the odd point data are sent into the I passage, and the even number point data is sent into the Q passage.
I channel signal dot interlace is added " 0 " form the I1 signal, Q channel signal also dot interlace adds " 0 " formation Q1 signal.The mode of zero insertion can be referring to the I of OQAM among Fig. 3 at interval, and the Q channel signal is formed schematic diagram.Among Fig. 3, the valid data of I passage and Q passage are represented the odd point data and the even number point data of the digital signal behind the coding respectively.
It is 0 each point that I channel signal I1 has the corresponding Q channel signal of the each point of value Q1; It is 0 each point that Q channel signal Q1 has the corresponding I channel signal of the each point of value I1.
The Q1 signal of the I1 signal of I passage and Q passage is constantly begun to be multiplied by respectively 4 to be the sequence " 11-1-1 " in cycle from any one, form I2 and Q2 signal among Fig. 4, enter forming filter then, produce base band OQAM signal.
This forming filter is designed to the raised cosine roll off characteristic, and rolloff-factor is 12%.This forming filter can be each one on I road and Q road.In actual implementation procedure, this filter adopts the FIR structure, and according to the performance simulation result, this filter tap number is an odd number, as adopts 87 taps.Owing to can not occur simultaneously at synchronization I road signal and Q road signal, therefore also can carry out time division multiplexing with a filter, satisfy the requirement that two paths of signals is shaped.Send into first tap coefficient of this filter as the non-zero symbol in the I2 signal, this moment filter the odd number tap and be output as I3, even tap be output as Q3.Non-zero symbol in the corresponding Q2 signal of next symbol is sent into first tap coefficient of this filter, this moment filter even tap and be output as I3, odd number tap and be output as Q3.Obtain base band OQAM signal thus.Base band OQAM signal generates required intermediate-freuqncy signal through typical up-conversion module again.
Forming filter works on the character rate, and character rate is 14.285714MHz.In the 8MHZ data transfer bandwidth, on the base band OQAM signal spectrum of generation, pilot frequency locations drops on respectively ± near the 3.57MHz Frequency point on, referring to Fig. 6.
By the starting point of control with the periodic sequence of I1 signal and Q1 signal multiplication, be multiplied by " 11-1-1 " as I1, Q1 is multiplied by " 1-111 ", can also realize the upset of signal spectrum, to be suitable for different occasions and needs.
In actual applications, the present invention can also take following more simple implementation.
As shown in Figure 5, for the digital signal behind the coding, from any sign-on, as first symbol of field synchronization, the cycle of multiply by is 4 sequence " 11-1-1 ", then data is input in the forming filter.This forming filter also has the raised cosine roll off characteristic, and rolloff-factor is 12%, and can adopt the digital FIR structure, and according to simulation result, this filter tap is counted odd number, as adopts 87.Suppose that it has M tap, number from 1 to M.Forming filter inner the data accumulation in the tap that is numbered odd numbers such as 1,3,5,7 as 1 output, simultaneously the data accumulation in the tap that is numbered even numbers such as 2,4,6,8 as other 1 output.Because the data on the I road are just in time corresponding to 0 point on the Q road, data on the Q road are also just in time corresponding to 0 point on the I road, so when first symbol of field synchronization at first enters forming filter, the odd number tap and be the output on I road, even tap and be the output on Q road.After second symbol enters, then odd number tap this moment and be the output on Q road, even tap and be the output on I road.Whenever enter a symbol later on, two outputs just become the Q road by the I road, or become the I road by the Q road.Like this, only use a forming filter, just realized the shaping filter of I, Q two-way, directly obtained base band OQAM signal, greatly saved hardware resource.The intermediate frequency carrier of two-way quadrature is multiply by in the output of I, Q two-way shaping filter more respectively, can obtain intermediate frequency OQAM signal.
Forming filter works on the character rate, and character rate is 14.285714MHz.In the 8MHZ data transfer bandwidth, on the base band OQAM signal spectrum of generation, pilot frequency locations drops on respectively ± near the 3.57MHz Frequency point on, referring to Fig. 6.
Equally, for the digital signal behind the coding, from any sign-on, if the cycle of multiply by is 4 sequence starting point variation, as " 1-1-11 ", later processing procedure is the same, just can obtain the intermediate frequency OQAM signal after the spectrum inversion.
Claims (18)
1. the generation method of base band OQAM signal during a DTB Digital Terrestrial Broadcasting is transmitted is characterized in that may further comprise the steps:
Odd even is separated, and the input data from any sign-on, send into I passage and Q passage in turn according to the order of odevity, are used to form I, Q two paths of signals;
The dot interlace zero insertion, the I channel signal dot interlace that previous step is formed adds " 0 " formation I1 signal, and the Q channel signal dot interlace adding " 0 " that previous step is formed forms the Q1 signal;
Periodic sequence multiplies each other, and the Q1 signal of the I1 signal of I passage and Q passage is constantly begun to be multiplied by respectively 4 to be the sequence " 11-1-1 " in cycle from any one, forms I2 signal and Q2 signal respectively;
Shaping filter is sent into I2 signal and Q2 signal that forming filter carries out low-pass filtering and sideband is shaped, thereby obtains digital baseband OQAM signal.
2. the generation method of base band OQAM signal according to claim 1 is characterized in that: the input data before described odd even is separated are that the symbol of various transmission modes is in the digital signal that adds the needs transmission that forms after synchronizing signal and the pilot signal.
3. the generation method of base band OQAM signal according to claim 2 is characterized in that: under the trellis coding 64-OQAM modulating mode, each data symbol is 3 bits, 8 level symbols; Under the 16-OQAM modulating mode, each data symbol is 2 bits, 4 level symbols; Under the trellis coding 16-OQAM modulating mode, each data symbol is 2 bits, 4 level symbols; Under the 4-OQAM modulating mode, each data symbol is 1 bit, 2 level symbols; Under the convolutional encoding 4-OQAM modulating mode, each data symbol is 1 bit, 2 level symbols.
4. the generation method of base band OQAM signal according to claim 1 is characterized in that: by the starting point of control with the periodic sequence of I1 signal and Q1 signal multiplication, realize the upset of signal spectrum, to be suitable for different occasions and needs.
5. the generation method of base band OQAM signal according to claim 1 is characterized in that: respectively there is a channel forming filter on I road and Q road;
6. the generation method of base band OQAM signal according to claim 1, it is characterized in that: I road and Q road are by the shared channel forming filter of time division multiplexing, non-zero signal among I2 and the Q2 is alternately sent into this filter, the odd number tap of correspondence and output I3 signal when the non-zero signal of I2 is sent into this filter, even tap and output Q3 signal; The even tap of correspondence and output I3 signal, odd number tap and output Q3 signal when the non-zero signal of Q2 is sent into this filter.
7. according to the generation method of claim 5 or 6 described base band OQAM signals, it is characterized in that: described forming filter is the PRC filter, adopts the FIR structure, has a nonzero coefficient at least, and its number of taps is more than or equal to 1, and is odd number.
8. the generation method of base band OQAM signal according to claim 7 is characterized in that: described forming filter is 12% PRC filter.
9. the generation method of base band OQAM signal according to claim 7 is characterized in that: the number of taps of described forming filter is 87.
10. the generation method of base band OQAM signal according to claim 1 is characterized in that: forming filter works on the character rate, and character rate is 14.285714MHz.
11. the generation method of base band OQAM signal according to claim 1 is characterized in that: in the data transfer bandwidth of 8MHz, on the base band OQAM signal spectrum of generation, pilot frequency locations drops on respectively ± near the 3.57MHz Frequency point on.
12. the generation method of base band OQAM signal according to claim 1, it is characterized in that: remove odd even and separate and two steps of dot interlace zero insertion, for the input data, with any symbol as first sign-on, directly the cycle of multiply by is 4 sequence " 11-1-1 ", then data are sent into a forming filter, the odd number tap of this forming filter and alternately export the I road and Q roadbed band signal, even tap and alternately export the Q road and I roadbed band signal simultaneously, thereby realized the shaping filter of I, Q two-way, obtained digital baseband OQAM signal.
13. the generation method of base band OQAM signal according to claim 12 is characterized in that: described forming filter is the PRC filter, adopts the FIR structure, has a nonzero coefficient at least, and its number of taps is more than or equal to 1, and is odd number.
14. the generation method of base band OQAM signal according to claim 13 is characterized in that: described forming filter is 12% PRC filter.
15. the generation method of base band OQAM signal according to claim 13 is characterized in that: the number of taps of described forming filter is 87.
16. the generation method of base band OQAM signal according to claim 12, it is characterized in that: for the input data, with any symbol as first sign-on, by controlling the starting point of the periodic sequence that multiplies each other with it, realize the signal spectrum upset, to be suitable for different occasions and needs.
17. the generation method of base band OQAM signal according to claim 12 is characterized in that: forming filter works on the character rate, character rate is 14.285714MHz.
18. the generation method of base band OQAM signal according to claim 12 is characterized in that: in the 8MHz data transfer bandwidth, on the base band OQAM signal spectrum of generation, pilot frequency locations drops on respectively ± near the 3.57MHz Frequency point on.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102065050A (en) * | 2010-09-30 | 2011-05-18 | 中国科学院国家天文台 | System for demodulating downlink data of detector using CCSDS-like (Consultative Committee for Space Data Systems) standard |
| CN101499992B (en) * | 2008-01-30 | 2012-12-26 | 索尼株式会社 | Decoding device and method, receiving device and method |
| CN104717170A (en) * | 2015-01-30 | 2015-06-17 | 哈尔滨工业大学 | Signal modulating and demodulating method capable of reconstructing terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5477199A (en) * | 1994-04-05 | 1995-12-19 | Scientific-Atlanta, Inc. | Digital quadrature amplitude and vestigial sideband modulation decoding method and apparatus |
| US6185259B1 (en) * | 1996-06-12 | 2001-02-06 | Ericsson Inc. | Transmitter/receiver for GMSK and offset-QAM |
| CN1407802A (en) * | 2001-08-23 | 2003-04-02 | 浙江大学 | Dada mapping method in digital TV and broadcasting transmission |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499992B (en) * | 2008-01-30 | 2012-12-26 | 索尼株式会社 | Decoding device and method, receiving device and method |
| CN102065050A (en) * | 2010-09-30 | 2011-05-18 | 中国科学院国家天文台 | System for demodulating downlink data of detector using CCSDS-like (Consultative Committee for Space Data Systems) standard |
| CN102065050B (en) * | 2010-09-30 | 2013-08-07 | 中国科学院国家天文台 | System for demodulating downlink data of detector using CCSDS-like (Consultative Committee for Space Data Systems) standard |
| CN104717170A (en) * | 2015-01-30 | 2015-06-17 | 哈尔滨工业大学 | Signal modulating and demodulating method capable of reconstructing terminal |
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