CN100576782C - Can improve the multicarrier transmitting system and the method for multicarrier receiving system receiving efficiency - Google Patents
Can improve the multicarrier transmitting system and the method for multicarrier receiving system receiving efficiency Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000007493 shaping process Methods 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims description 33
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 238000003780 insertion Methods 0.000 description 7
- 230000037431 insertion Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
- H04L1/0042—Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
- H04N5/40—Modulation circuits
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Discrete Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Television Systems (AREA)
Abstract
A kind of multicarrier transmitting system and method thereof.This system comprises: the system information generation unit produces system information and additional information; System information is inserted the unit, system information is inserted the data flow that will send; The IDFT operation is carried out to the data flow of having inserted system information in the IDFT unit, forms ofdm signal; GI inserts the unit, and GI is inserted ofdm signal, forms the ofdm signal that has inserted GI; PN sequence generation unit produces the PN sequence; Synchronizing information forms the unit, additional information is added on the PN sequence of generation, forms the synchronizing information that comprises additional information; Synchronizing information is inserted the unit, will be inserted into from the synchronizing information that synchronizing information forms unit output before the GI the ofdm signal that inserts GI, forms and sends signal; The shaping filter unit carries out shaping filter and output to sending signal.This system obtained in time domain synchronously before carrying out DFT, can carry out signal processing rapidly.
Description
Technical field
The present invention relates to multicarrier transmitting system and sending method thereof, particularly can improve the multicarrier transmitting system and the sending method thereof of the conversion speed of multicarrier receiving system.
Background technology
Orthodoxy Frequency Division Multiplex, a kind of multi carrier modulation scheme provides good performance under the environment that receives and move reception such as multipath.
OFDM uses the carrier wave of a plurality of orthogonality relations to improve frequency efficiency.Because it uses multicarrier in the wire/wireless channel, so it is applicable to that high-speed data sends.The high-speed data that uses single carrier wave to carry out short code unit's cycle in the radio communication channel with multichannel decline sends and will cause serious inter symbol interference.Thereby the complexity of aggravation receiving terminal.The OFDM scheme can be used the simple equalizer of a tap (tap), deal with the serious frequency Selective Fading Channel that multi-path environment causes well, this is because it can extend to the code-element period of each subcarrier the same longly with the quantity of subcarrier, also keeps the current data transmission speed simultaneously.
Because the OFDM scheme is used the carrier wave of a plurality of orthogonality relations, so it has very high frequency efficiency.Realization is to the modulation and demodulation of a plurality of carrier waves rapidly by using invert fast fourier transformation and fast fourier transform, and its effect is identical with discrete Fourier transform (DFT) with the use inverse discrete Fourier transformer inverse-discrete.Current use OFDM scheme is as the standard of ground digital audio broadcasting or digital video broadcast-terrestrial.
The OFDM scheme comprises vector Orthodoxy Frequency Division Multiplex (VOFDM) and coded orthogonal frequency division multiplexing, also has Domain Synchronous-OFDM (TDS-OFDM).One of TDS-OFDM is characterised in that it inserts pseudo noise (PN) sequence as synchronizing information in sending signal, so that make transmitter and receiver synchronous.
Fig. 1 is the schematic block diagram according to the multicarrier transmitting system of TDS-OFDM standard.With reference to figure 1, the multicarrier transmitting system comprises: system information is inserted unit 5, inverse discrete Fourier transformer inverse-discrete (IDFT) unit 10, protection, and (GI) inserts unit 20 at interval, pseudo noise (PN) sequence is inserted unit 30 and shaping filter unit 40.
Send for the data in the multicarrier system, the multicarrier transmitting system is encoded by the transmission signal in the frequency domain so that error correction, and with Quadrature Phase Shift Keying (QPSK), 16 quadrature amplitude modulations (16QAM), 64QAM etc. coded data is shone upon.
System information is inserted unit 5 insertion system information in mapped transmission signal.After insertion system information, will send signal and be sent to IDFT unit 10, will send signal at this and be modulated in the time domain, thus the ofdm signal in the formation time domain.
GI inserts in the ofdm signal of unit 20 in time domain and inserts GI, so that avoid taking place in the multi-path environment inter symbol interference (ISI).GI is that the afterbody from ofdm signal copies to its head.
System information comprises at least one in the following information: by the length pattern information of the length pattern information of the transmission signal of IDFT unit 10 modulation, GI, send signal mapped mode information, send the frame sequential information and the TPS information of signal.TPS information comprises qam constellation information, rating information and inner code rate information.
The PN sequence is inserted unit 30 and insert the PN sequence that is produced by PN sequence generation unit (not shown) in ofdm signal, more particularly, inserts the PN sequence before the GI that inserts ofdm signal.The PN sequence is a synchronizing information, is used to make multicarrier receiving system and multicarrier transmitting system synchronous, and PN sequence shape such as code-element string, wherein arranges a succession of code element.The size of a code element is 2.Here, 2 bit symbols are example, therefore, should not regard restriction as.Thereby the size of code element can be 4 or 8.Although the PN sequence is seemingly at random, the PN sequence is not random noise, but the sequence of a succession of digital " 0 " and " 1 ".The PN sequence comprises 2
M-1 code element, it periodically repeats.Here, " M " is natural number, and the quantity of the resistor of indication PN sequence generation unit (not shown).
Filtering is carried out in shaping filter unit 40, so that carry out the GI of insertion ofdm signal and the shaping pulse of PN sequence.After by shaping filter unit 40 filtering GI and PN sequence, send ofdm signal through antenna 50.
Fig. 2 is the schematic diagram of frame structure of the transmission signal of exploded view 1.With reference to figure 2, the transmission signal that sends to the multicarrier receiving system comprises ofdm signal, GI and the frame synchronizing signal in the time domain.Fig. 2 shows the ofdm signal in the frequency domain, comprises system information, that is, comprise the frame group number of inserting in a plurality of code elements that send signal (FGN) and send parameter signal (TPS)
Frame synchronizing signal also comprises PN sequence, preamble and postamble.The PN sequence comprises 255 code elements in Fig. 2.The purpose of adding preamble and postamble is to improve the channel estimating and the equilibrium of multicarrier receiving system.Preamble is that the afterbody from the code-element string of PN sequence copies to head, copies to afterbody and postamble is a head from the code-element string of PN sequence.
Yet, in traditional multicarrier transmitting system, owing in frame synchronizing signal, inserted preamble and postamble, be short to when needing to consider ghost image, so that the performance of multicarrier receiving system will be made us will be dissatisfied in its scope.More particularly, owing to after traditional multicarrier receiving system signal processing or IDFT in frequency domain at the fixed time, must obtain additional information frequency domain from the system information of inserting, complete signal processing consumes the plenty of time.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of multicarrier transmitting system and the method thereof that can improve the conversion speed of multicarrier receiving system.
To achieve these goals, provide a kind of multicarrier transmitting system.This multicarrier transmitting system comprises: the system information generation unit is used to produce system information and additional information; System information is inserted the unit, is used for described system information is inserted the data flow that will send; The IDFT unit is used for the data flow of having inserted described system information is therein carried out the IDFT operation, to form ofdm signal; GI inserts the unit, is used for GI is inserted ofdm signal, to form the ofdm signal that has inserted GI; PN sequence generation unit is used to produce the PN sequence; Synchronizing information forms the unit, is used for adding the PN sequence that is produced by PN sequence generation unit to from the described additional information of described system information generation unit output, and forms the synchronizing information that comprises described additional information; Synchronizing information is inserted the unit, and the synchronizing information that is used for forming unit output from described synchronizing information is inserted into before the GI of the ofdm signal that inserts GI, sends signal to form; And the shaping filter unit, be used for carrying out shaping filter, and export this transmission signal sending signal.
According to a further aspect in the invention, provide a kind of employing pseudo noise (PN) to send the multi-carrier transmission method of Orthodoxy Frequency Division Multiplex (OFDM) signal, wherein, described pseudo noise (PN) is to be used to make transmitter and the synchronous synchronizing information of receiver, and this method comprises the steps: to produce system information and additional information; Described system information is inserted the data flow that will send; The data flow of having inserted described system information is therein carried out the IDFT operation, to form ofdm signal; GI is inserted ofdm signal, to form the ofdm signal that has inserted GI; Produce the PN sequence; Described additional information is added on the PN sequence that is produced, and form the synchronizing information that comprises described additional information; Described synchronizing information inserted before the GI in the ofdm signal that has inserted GI, send signal to form; And carry out shaping filter to sending signal, and output sends signal.
System information comprises at least one in the following information: by the length pattern information of the length pattern information of the transmission signal of IDFT cells modulate, GI, send signal mapped mode information, send the frame sequential information and the TPS information of signal.
Description of drawings
By the preferred embodiments of the present invention are described with reference to the drawings, it is clearer that above-mentioned purpose of the present invention and feature will become, wherein:
Fig. 1 is the schematic block diagram according to the multicarrier transmitting system of TDS-OFDM;
Fig. 2 is the schematic diagram of frame structure of the transmission signal of Fig. 1;
Fig. 3 is the schematic block diagram of multicarrier transmitting system of the present invention;
Fig. 4 is the flow chart of the multi-carrier transmission method carried out of the multicarrier transmitting system of exploded view 3; And
Fig. 5 is the schematic diagram of frame structure of transmission signal of the multicarrier transmitting system of exploded view 3.
Embodiment
The preferred embodiments of the present invention are described below with reference to the accompanying drawings in more detail.
Fig. 3 is a schematic block diagram of showing multicarrier transmitting system of the present invention.
Multicarrier transmitting system of the present invention comprises: system information is inserted unit 100, system information generation unit 105, inverse discrete Fourier transformer inverse-discrete (IDFT) unit 110, protection, and (GI) insertion unit 120, pseudo noise (PN) sequence generation unit 130, synchronizing information form unit 140 at interval, synchronizing information is inserted unit 150, shaping filter unit 160 and antenna 170.Synchronizing information forms unit 140 and comprises the adding device (not shown).
Fig. 4 is the flow chart of the multi-carrier transmission method carried out of the multicarrier transmitting system of exploded view 3.Below with reference to Fig. 3 and 4, multicarrier transmitting system of the present invention is described in more detail.
Send for the data in the multicarrier system, the multicarrier transmitting system is encoded by the transmission signal (as data flow) in the frequency domain so that error correction, and with Quadrature Phase Shift Keying (QPSK), 16 quadrature amplitude modulations (16QAM), 64QAM etc. coded data is shone upon.
System information generation unit 105 produces system information and additional information (step S401).
System information is inserted insertion system information (step S402) in the transmission signal of unit 100 in mapped frequency domain then.
After insertion system information, will send signal and be sent to IDFT unit 110, and IDFT unit 110 is modulated to ofdm signal (step S403) in the time domain with the signal in the frequency domain.
GI inserts in the ofdm signal of unit 120 in time domain and inserts GI, so that prevent to take place in the multi-path environment inter symbol interference (ISI) (step S404).GI is that the afterbody from ofdm signal duplicates, and GI inserts the head that the GI that will duplicate like this unit 120 inserts ofdm signal.
System information comprises at least one in the following information: by the length pattern information of the length pattern information of the transmission signal of IDFT unit 110 modulation, GI, send signal mapped mode information, send the frame sequential information and the TPS information of signal.TPS information comprises qam constellation information, rating information and inner code rate information.
Simultaneously, the PN sequence is inserted unit 130 and is produced PN sequence (step S405).The PN sequence is a synchronizing information, is used to make multicarrier receiving system and multicarrier transmitting system synchronous, and the PN sequence forms code-element string, wherein arranges a succession of code element.The size of code element is 2.Here, 2 bit symbols are example, therefore, should not regard restriction as.Thereby the size of code element can be 4 or 8.Although the PN sequence is seemingly at random, the PN sequence is not random noise, but the sequence of a succession of digital " 0 " and " 1 ".The PN sequence comprises 2
M-1 code element, it periodically repeats.Here, " M " is natural number, and the quantity of the resistor of indication PN sequence generation unit (not shown).
Synchronizing information forms unit 140 and receives respectively additional system information and PN sequence from system information generation unit 105 and PN sequence generation unit 130, so that form synchronizing information (step S406).More particularly, the adding device that synchronizing information forms in the unit 140 adds additional information on the PN sequence that is produced to, and forms the synchronizing information that comprises additional information.In this case, add the system information that additional information on the PN sequence refers to comprise at least one system information of inserting the transmission signal in the frequency domain to.As another example, additional information is the part of the system information of generation in the system information generation unit 105.
Here, synchronizing information forms front or the back that unit 140 can be added on additional information the PN sequence, and perhaps alternatively, synchronizing information forms unit 140 can all add additional information in the front and back of PN sequence.
Fig. 5 is the schematic diagram of frame structure of transmission signal of the multicarrier transmitting system of exploded view 3.With reference to figure 5, the transmission signal that sends to the multicarrier receiving system comprises ofdm signal, GI and the synchronizing signal in the time domain.Here ofdm signal comprises system information, has promptly inserted the frame group number (FGN) in a plurality of code elements of the transmission signal in the frequency domain and has sent parameter signal (TPS).Simultaneously, all added additional information in the front and back of PN sequence.
Synchronizing information insertion unit 150 inserts in ofdm signal and forms the synchronizing information that unit 140 forms by synchronizing information, and more particularly, synchronizing information is inserted unit 150 and inserted synchronizing information (step S407) before the GI that inserts in the ofdm signal.
The 160 pairs of ofdm signals in shaping filter unit carry out shaping filter, so that carry out the GI that inserts ofdm signal and the shaping pulse (step S408) of synchronizing information.After carrying out shaping filter, send ofdm signal to the OFDM receiving system via antenna 170 by shaping filter unit 160.Thereby the multicarrier of finishing by multicarrier transmitting system of the present invention sends.
According to the present invention, because when the multicarrier receiving system sends data, the multicarrier transmitting system is added system information on the PN sequence to, so it can avoid multicarrier receiving system accumulation signal to obtain the length pattern such as DFT, the length pattern of GI and the information processing of constellation information, has also avoided its additional treatments to signal.As a result, before carrying out DFT, in time domain, promptly obtained synchronously, thereby allowed the fast signal processing.
Although described the preferred embodiments of the present invention, but persons skilled in the art should be appreciated that, the invention is not restricted to described preferred embodiment, under the situation of the spirit and scope that do not break away from the claims qualification, can do various changes and modification it.
Claims (8)
1. multicarrier transmitting system comprises:
The system information generation unit is used to produce system information and additional information;
System information is inserted the unit, is used for described system information is inserted the data flow that will send;
The IDFT unit is used for the data flow of having inserted described system information is therein carried out the IDFT operation, to form ofdm signal;
GI inserts the unit, is used for GI is inserted ofdm signal, to form the ofdm signal that has inserted GI;
PN sequence generation unit is used to produce the PN sequence;
Synchronizing information forms the unit, is used for adding the PN sequence that is produced by PN sequence generation unit to from the described additional information of described system information generation unit output, and forms the synchronizing information that comprises described additional information;
Synchronizing information is inserted the unit, and the synchronizing information that is used for forming unit output from described synchronizing information is inserted into before the GI of the ofdm signal that inserts GI, sends signal to form; And
The shaping filter unit is used for carrying out shaping filter to sending signal, and exports this transmission signal,
Wherein, described additional information is the part of described system information.
2. multicarrier transmitting system as claimed in claim 1, it is characterized in that, described system information comprises at least one in the following information: by the length pattern information of the length pattern information of the transmission signal of IDFT cells modulate, GI, send signal mapped mode information, send the frame sequential information and the TPS information of signal, and described additional information comprises the length pattern of DFT, length pattern and the constellation information of GI at least.
3. multicarrier transmitting system as claimed in claim 1, it is characterized in that described system information comprises at least one in the following information: by the length pattern information of the length pattern information of the transmission signal of IDFT cells modulate, GI, send signal mapped mode information, send the frame sequential information and the TPS information of signal.
4. as any one described multicarrier transmitting system among the claim 1-3, it is characterized in that synchronizing information forms the unit and comprises adding device, be used for described additional information is added on before or after the PN sequence.
5. an employing pseudo noise (PN) sends the multi-carrier transmission method of Orthodoxy Frequency Division Multiplex (OFDM) signal, and wherein, described pseudo noise (PN) is to be used to make transmitter and the synchronous synchronizing information of receiver, and this method comprises the steps:
Produce system information and additional information;
Described system information is inserted the data flow that will send;
The data flow of having inserted described system information is therein carried out the IDFT operation, to form ofdm signal;
GI is inserted ofdm signal, to form the ofdm signal that has inserted GI;
Produce the PN sequence;
Described additional information is added on the PN sequence that is produced, and form the synchronizing information that comprises described additional information;
Described synchronizing information inserted before the GI in the ofdm signal that has inserted GI, send signal to form; And
Carry out shaping filter to sending signal, and output transmission signal,
Wherein, described additional information is the part of described system information.
6. multi-carrier transmission method as claimed in claim 5, it is characterized in that, described system information comprises at least one in the following information: operate the length pattern information of the transmission signal of modulation, the length pattern information of GI, the mapped mode information of transmission signal, the frame sequential information and the TPS information of transmission signal by IDFT, and described additional information comprises the length pattern of DFT, length pattern and the constellation information of GI at least.
7. multi-carrier transmission method as claimed in claim 5, it is characterized in that described system information comprises at least one in the following information: the frame sequential information and the TPS information of operating the length pattern information of the transmission signal of modulation, the length pattern information of GI, the mapped mode information that sends signal, transmission signal by IDFT.
8. as any one described multi-carrier transmission method among the claim 5-7, it is characterized in that synchronizing information forms step and comprises the interpolation step, be used for described additional information is added on before or after the PN sequence.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020020064082A KR100920734B1 (en) | 2002-10-19 | 2002-10-19 | Multi-carrier transmission system capable of improving receiving efficiency of multi-carrier receiving system and a method thereof |
| KR64082/02 | 2002-10-19 | ||
| KR64082/2002 | 2002-10-19 |
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| Publication Number | Publication Date |
|---|---|
| CN1490953A CN1490953A (en) | 2004-04-21 |
| CN100576782C true CN100576782C (en) | 2009-12-30 |
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| CN03123259A Expired - Fee Related CN100576782C (en) | 2002-10-19 | 2003-04-24 | Can improve the multicarrier transmitting system and the method for multicarrier receiving system receiving efficiency |
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| KR100996417B1 (en) * | 2006-02-03 | 2010-11-25 | 삼성전자주식회사 | Method and apparatus for transmitting/receiving signaling parameter in a digital multimedia broadcasting system |
| CN101018221B (en) * | 2006-02-10 | 2013-05-01 | 中兴通讯股份有限公司 | Signal sending method of OFDM system and cell searching method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100236039B1 (en) * | 1997-06-30 | 1999-12-15 | 전주범 | A coarse time acquisition for ofdm |
| KR100859878B1 (en) * | 2002-05-30 | 2008-09-24 | 삼성전자주식회사 | OFDM transmitter capable of inserting the PN in every the number the OFDM symbols variably according to service-mode of OFDM signal |
| KR100886124B1 (en) * | 2002-05-30 | 2009-02-27 | 삼성전자주식회사 | OFDM transmitter capable of regulating the level-value of PN according to service-mode of OFDM |
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2002
- 2002-10-19 KR KR1020020064082A patent/KR100920734B1/en not_active IP Right Cessation
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| KR100920734B1 (en) | 2009-10-07 |
| CN1490953A (en) | 2004-04-21 |
| KR20040035294A (en) | 2004-04-29 |
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