CN1490951A - Multicarrier transmitting system for inserting pilot signal in time-domain and inserting method thereof - Google Patents
Multicarrier transmitting system for inserting pilot signal in time-domain and inserting method thereof Download PDFInfo
- Publication number
- CN1490951A CN1490951A CNA031086896A CN03108689A CN1490951A CN 1490951 A CN1490951 A CN 1490951A CN A031086896 A CNA031086896 A CN A031086896A CN 03108689 A CN03108689 A CN 03108689A CN 1490951 A CN1490951 A CN 1490951A
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- Prior art keywords
- pilot tone
- time domain
- ofdm signal
- unit
- domain ofdm
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
- H04L27/2659—Coarse or integer frequency offset determination and synchronisation
-
- 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
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2672—Frequency domain
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
-
- 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
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Mobile Radio Communication Systems (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
A multi-carrier transmission system for inserting a pilot tone into a frequency region and an inserting method thereof are provided to improve the synchronous performance of a receiver by inserting the pilot tone into a guard band and an edge part of an effective signal. A multi-carrier transmission system for inserting a pilot tone into a frequency region includes an FEC unit(110), a pilot insertion unit(120), an OFDM modulation unit(130), and a guard interval insertion unit(140). The FEC unit(110) encodes data of a frequency region in order that a receiving unit senses and corrects an error. The pilot insertion unit(120) adds a constant to a predetermined position of the data of the frequency region. The OFDM modulation unit(130) modulates the data of the frequency region and outputs OFDM signals of a time region. The guard interval insertion unit(140) inserts guard intervals into the OFDM signals of the time region. The constant is generated by a pilot tone of the frequency region.
Description
Technical field
The present invention relates to digit broadcasting system, more particularly, relate to multicarrier transmitting system and the pilot tone insertion method thereof that to improve receptivity.
Background technology
Under multipath and mobile reception environment, OFDM (OFDM) is a kind of multi-carrier modulation method with superperformance.
The OFDM method adopts mutually orthogonal a plurality of carrier waves to increase frequency utilization efficient.When the multicarrier method was used for wired or wireless passage, the OFDM method was suitable for high data rate and sends.When the single carrier method being used for send when having the high-speed data of short mark space,, thereby the complexity of receiving terminal is sharply increased because intersymbol interference becomes seriously by wireless communication with multipath decline.
DVB-T (digital video broadcast-terrestrial) or COFDM (OFDM of coding) method towards Europe are inserted pilot data in the predetermined subcarrier in frequency domain, so that receiver uses the data of being inserted to obtain synchronously as the reference signal.
Fig. 1 illustrates the schematic block diagram of traditional DVB-T transmitting system.
This DVB-T transmitting system comprises FEC (forward error correction) unit 10, map unit 20, frame forming unit 30, IFFT unit 40, protects and insert unit 50 and RF (radio frequency) unit 60 at interval.
1) style information of qam constellation (constellation);
2) hierarchical information;
3) GI (protection at interval) length information;
4) in-line coding speed;
5) 2K or 8K sending mode;
6) frame number.
IFFT is carried out in IFFT unit 40, and frequency domain ofdm signal is transformed to time domain OFDM signal.
The DVB-T transmitting system is added a plurality of pilot tones in the OFDM frame signal to, is used for the synchronization acquistion and the channel-equalization of receiving terminal.
But,, may spend the long time to realize synchronously owing in frequency domain, obtain synchronously towards the DVB-T or the COFDM method in Europe.And, the DVB-T receiving system only use this pilot signal carry out channel-equalization and frequency domain synchronous, cause the performance of receiving system limited and descend thus.
Summary of the invention
The objective of the invention is the defective that addresses the above problem at least and/or exist, and can bring following at least advantage.
Therefore, the purpose of this invention is to provide and a kind ofly add pilot tone the multicarrier transmitting system and the signal processing method thereof of the receptivity of improving receiver in the time domain to, to address the above problem.
Multicarrier transmitting system according to the present invention comprises: the FEC unit is used for frequency domain data is encoded, so that the receiver EDC error detection and correction; The OFDM modulating unit is used to modulate coded frequency domain data with the output time domain OFDM signal; Protection is inserted the unit at interval, is used for inserting protection at interval in the time domain OFDM signal front; And pilot tone inserts the unit, is used for pilot tone is inserted at least one boundary belt (guard band) of time domain OFDM signal.
According to this multicarrier transmitting system, wherein pilot tone is inserted in two boundary belts of time domain OFDM signal.
According to this multicarrier transmitting system, pilot tone is inserted the unit and comprised: the first pilot tone maker is used to generate first pilot tone; And first adder, first pilot tone that is used for that the first pilot tone maker is generated is inserted a boundary belt of time domain OFDM signal.
According to this multicarrier transmitting system, pilot tone is inserted the unit and also comprised: the second pilot tone maker is used to generate second pilot tone; And second adder, second pilot tone that is used for that the second pilot tone maker is generated is inserted another boundary belt of time domain OFDM signal.
Pilot interposition method according to multicarrier transmitting system of the present invention comprises step: frequency domain data is encoded, so that the receiver EDC error detection and correction; Modulate coded frequency domain data with the output time domain OFDM signal; Insert protection at interval in the time domain OFDM signal front; Pilot tone is inserted at least one boundary belt of time domain OFDM signal; And on predetermined frequency band, send the time domain OFDM signal wherein insert pilot tone.
According to this method, pilot tone is inserted in two boundary belts of time domain OFDM signal.
According to this method, the pilot tone inserting step comprises step: generate first pilot tone; And first pilot tone that generated is inserted in the boundary belt of time domain OFDM signal.
According to this method, the pilot tone inserting step also comprises step: generate second pilot tone; And second pilot tone that generated is inserted in another boundary belt of time domain OFDM signal.
According to the present invention, pilot tone is inserted in the time domain, can improve the net synchronization capability of receiver thus, and make precise synchronization become possibility.
Other advantage of the present invention, purpose and characteristics will be set forth in the following description, and for a person skilled in the art, by studying following explanation or specifically putting into practice the present invention, it is clearer that said circumstances will become.As pointed in the appended claims, can realize and reach objects and advantages of the present invention.
Description of drawings
Describe the present invention with reference to following accompanying drawing, wherein, identical reference number is represented identical parts.
Fig. 1 illustrates the schematic block diagram of traditional DVB-T (adopting COFDM) transmitting system;
Fig. 2 illustrates the schematic block diagram according to the multicarrier transmitting system of the embodiment of the invention;
Fig. 3 A and 3B illustrate the spectrogram when inserting pilot tone;
The pilot tone that Fig. 4 illustrates the multicarrier transmitting system of Fig. 2 is inserted the block diagram of unit; And
The multicarrier transmitting system that Fig. 5 illustrates Fig. 2 is inserted method flow diagram in the time domain with pilot tone.
Embodiment
Describe multicarrier transmitting system according to the preferred embodiment of the invention in detail below in conjunction with accompanying drawing.
Fig. 2 illustrates the schematic block diagram according to the multicarrier transmitting system of the embodiment of the invention.
This multicarrier transmitting system comprises that FEC (forward error correction) unit 210, OFDM modulating unit 220, protection are inserted unit 230 at interval, pilot tone is inserted unit 240 and RF (radio frequency) unit 250.
Coding is carried out in FEC unit 210, so that the receiver EDC error detection and correction.
OFDM modulating unit 220 uses IFFT or IDFT processor that frequency domain ofdm signal is modulated to time domain OFDM signal usually.
Unit 230 is inserted at interval in protection will be inserted in the front of OFDM symbol from the GI of the afterbody intercepting of the OFDM symbol of OFDM modulating unit 220 outputs, so that prevent the ISI (intersymbol interference) under the multi-path environment.
Pilot tone is inserted unit 240 by pilot tone Ps being added to one or more precalculated positions of time domain OFDM signal, inserts pilot tone Ps in the time domain OFDM signal of inserting GI.The optimum position of the pilot tone Ps that is inserted, just the position of the pilot tone of being added can be arranged at least one boundary belt GB.
Fig. 3 A and 3B are the spectrograms that a pilot tone P1 or two pilot tone P1 and P2 is inserted into both sides boundary belt GB1 and GB2 in time domain.
Fig. 4 is the more detailed block diagram that the pilot tone of multicarrier transmitting system among Fig. 2 is inserted the unit.Be described in the processing procedure of inserting pilot tone Ps in the time domain below with reference to Fig. 3 A and 3B.
Pilot tone is inserted unit 240 and is comprised: two makers, and promptly pilot tone maker 11l and pilot tone maker 12 are used to generate pilot tone; And two adders, i.e. adder 1 and adder 2 are used for pilot tone is added to the precalculated position of the boundary belt of time domain OFDM signal.The pilot tone that the pilot tone maker is generated is
Wherein, ω
1And ω
2Correspond respectively to preset frequency GB
1And GB
2In this embodiment of the present invention, use two pilot tone makers and two adders respectively pilot tone to be inserted GB
1And GB
2In, shown in Fig. 3 B.According to another embodiment of the present invention, use a pilot tone maker and an adder that pilot tone is inserted GB
1And GB
2One in, as shown in Figure 3A.
The ofdm signal that the predetermined pilot sound inserts in the time domain is sent by the RF passage by RF unit 250.
Describe the method for pilot tone Ps being inserted time domain according to the multicarrier transmitting system of the embodiment of the invention in detail below with reference to the flow chart of Fig. 5.
Coding is carried out in FEC unit 210, so that receiver EDC error detection and correction (S100).
OFDM modulating unit 220 uses IFFT or IDFT processor that frequency domain ofdm signal is modulated to time domain OFDM signal (S200) usually.
Unit 230 is inserted at interval in protection will be inserted in the front of OFDM symbol from the GI (protection is at interval) of the afterbody intercepting of the OFDM symbol of OFDM modulating unit 220 outputs, so as to prevent under the multi-path environment ISI (intersymbol interference) (S300).
Pilot tone maker 11 generates and will be inserted into the pilot tone P1 that wherein has been inserted with the time domain OFDM signal of GI, and pilot tone maker 12 generates and will be inserted into the pilot tone P2 (S400) that wherein has been inserted with the time domain OFDM signal of GI.
Adder 1 adds pilot tone P1 in the precalculated position of one side of the boundary belt of time domain OFDM signal, and adder 2 adds pilot tone P2 in the precalculated position (S500) of opposite side of the boundary belt of time domain OFDM signal.
The ofdm signal that the predetermined pilot sound inserts in the time domain sends (S600) by RF unit 250 by the RF passage.
Above-mentioned multicarrier transmitting system according to the embodiment of the invention is that receiver is provided at the ofdm signal that inserts pilot tone in the time domain, can be synchronous well, thus improve receptivity.
According to the present invention, pilot tone is inserted in the boundary belt, improve the net synchronization capability of receiver thus, and and then make precise synchronization become possibility.
Although described the present invention with reference to certain preferred embodiment, it should be appreciated by those skilled in the art, under the situation of the spirit and scope of the present invention that do not break away from the claims qualification, can make the variation on various forms and the details.
The foregoing description and advantage only are used for the present invention exemplarily is described, rather than are used for limiting the present invention.Described principle can be applied to the device of other type naturally.Description of the invention attempts to illustrate rather than be used to limit the scope of claim.For a person skilled in the art, various distortion, change and correction all are conspicuous.In the appended claims, device adds the sentence formula of function to be attempted to cover the various structures of carrying out described function described here, is not limited only to structural equivalence, but comprises various equivalent constructions.
Claims (8)
1. multicarrier transmitting system comprises:
The FEC unit is used for frequency domain data is encoded, so that the receiver EDC error detection and correction;
The OFDM modulating unit is used to modulate coded frequency domain data with the output time domain OFDM signal;
Protection is inserted the unit at interval, is used for inserting protection at interval in the time domain OFDM signal front; And
Pilot tone is inserted the unit, is used for pilot tone is inserted at least one boundary belt of time domain OFDM signal.
2. multicarrier transmitting system according to claim 1, wherein, pilot tone is inserted in two boundary belts of time domain OFDM signal.
3. multicarrier transmitting system according to claim 1, wherein, pilot tone is inserted the unit and is comprised:
The first pilot tone maker is used to generate first pilot tone; And
First adder, first pilot tone that is used for that the first pilot tone maker is generated is inserted a boundary belt of time domain OFDM signal.
4. multicarrier transmitting system according to claim 3, wherein, pilot tone is inserted the unit and is also comprised:
The second pilot tone maker is used to generate second pilot tone; And
Second adder, second pilot tone that is used for that the second pilot tone maker is generated is inserted another boundary belt of time domain OFDM signal.
5. the pilot interposition method of a multicarrier transmitting system comprises step:
Frequency domain data is encoded, so that the receiver EDC error detection and correction;
Modulate coded frequency domain data with the output time domain OFDM signal;
Insert protection at interval in the time domain OFDM signal front;
Pilot tone is inserted at least one boundary belt of time domain OFDM signal; And
On predetermined frequency band, send the time domain OFDM signal of wherein inserting pilot tone.
6. method according to claim 5, wherein, pilot tone is inserted in two boundary belts of time domain OFDM signal.
7. method according to claim 5, wherein, the pilot tone inserting step comprises step:
Generate first pilot tone; And
First pilot tone that is generated is inserted in the boundary belt of time domain OFDM signal.
8. method according to claim 7, wherein, the pilot tone inserting step also comprises step:
Generate second pilot tone; And
Second pilot tone that is generated is inserted in another boundary belt of time domain OFDM signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020020064079A KR20040035291A (en) | 2002-10-19 | 2002-10-19 | Multi-carrier transmission system having the pilot tone in frequence domain and a method inserting pilot tone thereof |
| KR64079/2002 | 2002-10-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1490951A true CN1490951A (en) | 2004-04-21 |
Family
ID=34192035
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031086896A Pending CN1490951A (en) | 2002-10-19 | 2003-04-04 | Multicarrier transmitting system for inserting pilot signal in time-domain and inserting method thereof |
| CNA031086888A Pending CN1491011A (en) | 2002-10-19 | 2003-04-04 | Multicarrier transmitting system for inserting pilot signal in frequency domain and inserting method thereof |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031086888A Pending CN1491011A (en) | 2002-10-19 | 2003-04-04 | Multicarrier transmitting system for inserting pilot signal in frequency domain and inserting method thereof |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20040035291A (en) |
| CN (2) | CN1490951A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101606367B (en) * | 2007-02-09 | 2012-12-05 | Nxp股份有限公司 | Method of synchronizing multi-carrier systems and multi-carrier system |
| CN101005473B (en) * | 2006-01-19 | 2013-03-27 | 中兴通讯股份有限公司 | Synchronous signal sending method of orthogonal frequency division mutiplex system |
| CN104079519A (en) * | 2013-03-28 | 2014-10-01 | 美国博通公司 | Communication system with proactive network maintenance and methods for use therewith |
| CN105007243A (en) * | 2015-06-25 | 2015-10-28 | 华南理工大学 | Optimal pilot position insertion method and device based on judgment threshold |
| CN103152150B (en) * | 2007-05-28 | 2016-03-16 | 三星电子株式会社 | OFDM dispensing device and method thereof |
| WO2018184461A1 (en) * | 2017-04-05 | 2018-10-11 | Huawei Technologies Co., Ltd. | Systems and method of multi-band pilot tone based optical performance monitoring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100667705B1 (en) * | 2004-12-10 | 2007-01-12 | 한국전자통신연구원 | Sending method, sending apparatus and, receiving method, receiving apparatus in mimo-ofdm system |
| CN100493053C (en) * | 2005-05-13 | 2009-05-27 | 东南大学 | Method for channel estimation in multi-antenna system |
| US8942153B2 (en) | 2005-09-30 | 2015-01-27 | Lg Electronics Inc. | Method for transmitting and receiving data using a plurality of carriers |
| KR101191183B1 (en) * | 2005-09-30 | 2012-10-15 | 엘지전자 주식회사 | method for transmitting and receiving data using a plurality of carriers |
| KR100924684B1 (en) * | 2006-07-18 | 2009-11-03 | 삼성전자주식회사 | Apparatus and method for communication in broadband wireless communication system |
| CN101132384B (en) * | 2006-08-23 | 2011-01-12 | 大唐移动通信设备有限公司 | Method and apparatus for pilot frequency multiplexing in OFDM system |
| ES2898101T3 (en) * | 2014-10-31 | 2022-03-03 | Lg Electronics Inc | Multi-user transmission-reception method in wireless communication system and device for the same |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3130752B2 (en) * | 1995-02-24 | 2001-01-31 | 株式会社東芝 | OFDM transmission receiving method and transmitting / receiving apparatus |
| JPH10190608A (en) * | 1996-12-19 | 1998-07-21 | Lucent Technol Inc | Communication method |
| JP3686548B2 (en) * | 1999-05-19 | 2005-08-24 | 松下電器産業株式会社 | Transmission apparatus and OFDM symbol generation method |
| KR100363254B1 (en) * | 2000-02-18 | 2002-11-30 | 삼성전자 주식회사 | Apparatus and method for transmitting and receiving orthogonal frequency division multiplexing signal |
| KR100346205B1 (en) * | 1999-07-12 | 2002-08-01 | 삼성전자 주식회사 | Ofdm/cdma mobile communication system having pilot tone inserting and detecting apparatus |
| EP1133841B1 (en) * | 1999-09-29 | 2008-05-14 | Samsung Electronics Co., Ltd. | System and method for compensating timing errors using pilot symbols in a ofdm/cdma communication system |
| JP2001274764A (en) * | 2000-03-28 | 2001-10-05 | Matsushita Electric Ind Co Ltd | Digital signal transmitter |
-
2002
- 2002-10-19 KR KR1020020064079A patent/KR20040035291A/en not_active Application Discontinuation
-
2003
- 2003-04-04 CN CNA031086896A patent/CN1490951A/en active Pending
- 2003-04-04 CN CNA031086888A patent/CN1491011A/en active Pending
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| CN101005473B (en) * | 2006-01-19 | 2013-03-27 | 中兴通讯股份有限公司 | Synchronous signal sending method of orthogonal frequency division mutiplex system |
| US8369428B2 (en) | 2007-02-09 | 2013-02-05 | Nxp B.V. | Method of synchronizing multi-carrier systems and multi-carrier system |
| CN101606367B (en) * | 2007-02-09 | 2012-12-05 | Nxp股份有限公司 | Method of synchronizing multi-carrier systems and multi-carrier system |
| US10693681B2 (en) | 2007-05-28 | 2020-06-23 | Samsung Electronics Co., Ltd. | OFDM transmission/reception device for transmitting and receiving OFDM symbols having a variable data transmission rate and method thereof |
| CN103152150B (en) * | 2007-05-28 | 2016-03-16 | 三星电子株式会社 | OFDM dispensing device and method thereof |
| US9912496B2 (en) | 2007-05-28 | 2018-03-06 | Samsung Electronics Co., Ltd. | OFDM transmission/reception device for transmitting and receiving OFDM symbols having a variable data transmission rate and method thereof |
| US10218541B2 (en) | 2007-05-28 | 2019-02-26 | Samsung Electronics Co., Ltd. | OFDM transmission/reception device for transmitting and receiving OFDM symbols having a variable data transmission rate and method thereof |
| CN109088841A (en) * | 2013-03-28 | 2018-12-25 | 安华高科技股份有限公司 | Communication system and its application method with Active Networks maintenance |
| CN104079519A (en) * | 2013-03-28 | 2014-10-01 | 美国博通公司 | Communication system with proactive network maintenance and methods for use therewith |
| US10009191B2 (en) | 2013-03-28 | 2018-06-26 | Avago Technologies General Ip (Singapore) Pte. Ltd | Communication system with proactive network maintenance and methods for use therewith |
| CN105007243B (en) * | 2015-06-25 | 2018-02-27 | 华南理工大学 | Optimal pilot position insertion method and device based on decision threshold |
| CN105007243A (en) * | 2015-06-25 | 2015-10-28 | 华南理工大学 | Optimal pilot position insertion method and device based on judgment threshold |
| WO2018184461A1 (en) * | 2017-04-05 | 2018-10-11 | Huawei Technologies Co., Ltd. | Systems and method of multi-band pilot tone based optical performance monitoring |
| US10523315B2 (en) | 2017-04-05 | 2019-12-31 | Huawei Technologies Co., Ltd. | Systems and method of multi-band pilot tone based optical performance monitoring |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1491011A (en) | 2004-04-21 |
| KR20040035291A (en) | 2004-04-29 |
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