CN1968247A - OFDM receiver and receiving method thereof - Google Patents
OFDM receiver and receiving method thereof Download PDFInfo
- Publication number
- CN1968247A CN1968247A CNA2006101468705A CN200610146870A CN1968247A CN 1968247 A CN1968247 A CN 1968247A CN A2006101468705 A CNA2006101468705 A CN A2006101468705A CN 200610146870 A CN200610146870 A CN 200610146870A CN 1968247 A CN1968247 A CN 1968247A
- Authority
- CN
- China
- Prior art keywords
- signal
- broadcast singal
- mode
- service mode
- sequence information
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0022—PN, e.g. Kronecker
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
-
- 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
- H04L1/0045—Arrangements at the receiver end
-
- 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
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
Abstract
The present invention relates to an OFDM receiver for receiving the time region synchronous transmitting signal, and the PN series setting by the alterable level value which is corresponding to the predetermined service mode is inserted into the OFDM signal as a synchronous information. The OFDG receiver comprises: a synchronization unit receives a transmitting signal to compensate a frequency offset and a timing offset thereof; a service mode detection unit detects a service mode corresponding to a level value of a pseudo noise (PN) series from an output signal of the synchronization unit. Thus, the level value of the PN series information inserted into the OFDG signal is detected before receiving the OFDG signal is resumed so that the service mode for receiving the OFDG signal is confirmed.
Description
The application is to be that June 25, application number in 2004 are 200410049819.3, are entitled as the dividing an application of patent application of " orthogonal frequency diversity receiver and method of reseptance thereof " applying date.
Technical field
The present invention relates to a kind of OFDM (OFDM) receiving system and method for reseptance thereof.More particularly, the present invention relates to a kind of OFDM receiving system and method for reseptance thereof that can receive the ofdm signal by Domain Synchronous OFDM (TDS-OFDM) modulation and before recovering the ofdm signal that receives, promptly detect service mode.
Background technology
OFDM is widely used in the digital transmission technologies, for example digital audio broadcasting (DAB), terrestrial digital television broadcasting, wireless lan (wlan) and wireless asynchronous transfer mode (WATM).OFDM, promptly OFDM is that data decomposition is become a plurality of data, the data of using a hundreds of sub-carrier modulation to decompose, and the parallel multi-transceiver technology that sends data.OFDM improves the transmission speed of each bandwidth and reduces the digital modulation that multipath disturbs.When OFDM sends data, keep the orthogonality between the subcarrier, thereby, best efficiency of transmission in the high speed data transfer process, obtained.
Using the synchronous TDS-OFDM of time domain and vector OFDM (VOFDM) and Coded Orthogonal Frequency Division Multiplexing (COFDM) (COFDM) is a kind of among the OFDM.Use the dispensing device of TDS-OFDM to use Domain Synchronous to send ofdm signal, and will send signal scrambling code with respect to the OFDM of the bandwidth assignment that sets in advance along time shaft.In addition, as shown in Figure 1, the dispensing device of TDS-OFDM inserted protection interval (GI) to suppress interference between signals and inserted the synchronizing information of using pseudo noise sequence (PN sequence) before GI before the OFDM that forms along time shaft sends signal.The PN sequence is used as the synchronizing information of the synchronous and channel that is used to predict the ofdm signal that receives at the OFDM receiving system.
Fig. 2 is that expression is used to receive and handle by the block diagram of the example of the OFDM receiving system of the signal of traditional OFDM modulation.With reference to Fig. 2, traditional OFDM receiving system comprises lock unit 10, fast Fourier transform (FFT) unit 20, sends parameter signal (TPS) extraction and decoding unit 30 and forward error correction (FEC) unit 40.
In said structure, by it being included in the information that sends among the TPS about service mode, TPS uses predetermined subcarrier to send.Information about service mode comprises: about the information of data class, for example, digital TV (DTV) signal, mobile communication signal and mobile text message service signal; The FEC code rate; Or about the kinds of information of the FEC that uses.Service mode information can be used in the process of FEC processing or source coding processing.
Therefore, in order to detect information about service mode, from the signal of FFT unit 20 conversion, extracting TPS, and with its decoding.More particularly, in order to detect service mode information, carry out to the received signal synchronously, fast fourier transform and TPS extract and process of decoding.Therefore because with following identical situation under, for example when when the receiving system that is used to receive the DTV signal receives mobile communication signal, needn't be in corresponding receiver devices processing signals, so, carried out unnecessary processing with respect to signal.This may cause the waste of information source.
Summary of the invention
According to an aspect of the present invention, OFDM receiving system and method for reseptance thereof in the receiving system of a kind of TDS-OFDM are provided, and this device can promptly detect information about service mode to reduce the quantity of signal processing before recovering the ofdm signal that receives.
According to an aspect of the present invention, a kind of OFDM receiving system is provided, this device receives Domain Synchronous and sends signal, the PN sequence information that will have the level corresponding with service mode is inserted into ofdm signal as synchronizing information, comprise: lock unit is used to receive the signal that sends signal and output compensation frequency displacement and timing slip; With service mode detection unit, be used for detecting the corresponding service mode of level with the PN sequence of the signal of exporting from lock unit that receives.
In a preferred embodiment of the invention, the OFDM receiving system also comprises: the FFT unit, be used for the signal transformation from lock unit output is become frequency-region signal, and the signal of output transform; With the FEC unit, be used for the error correction decoding of dateout.
The service mode detecting unit can be based on the power ratio detection service mode of PN sequence information with respect to the ofdm signal that inserts GI therein.Service mode can be one of DTV broadcast mode, mobile communication mode and mobile text message service pattern.When service mode such as when above-mentioned, consider the communication environment in every kind of pattern, the level of PN sequence information is set to reduce successively by the order of DTV broadcast mode, mobile communication mode and mobile text message service pattern.
Simultaneously, a kind of OFDM method of reseptance is provided, and this method receives Domain Synchronous and sends signal, and the PN sequence information that will have the level corresponding with service mode is inserted into ofdm signal as synchronizing information, comprise: the signal that (a) reception transmission signal, and output frequency displacement and timing slip are compensated; (b) from the signal of output step (a), detect the service mode corresponding with the level of PN sequence.
In a preferred embodiment of the invention, the OFDM method of reseptance comprises the steps: that also the signal transformation that (c) will export becomes frequency-region signal in step (a), and the signal of output transform; (d) carry out error correction with respect to the data of conversion.
Step (b) is based on the power ratio detection service mode of PN sequence information with respect to the ofdm signal that inserts GI therein.In addition, service mode can comprise one of DTV broadcast mode, mobile communication mode and mobile text message service pattern.If service mode such as above-mentioned is considered the communication environment in every kind of pattern, the level of PN sequence information is set to reduce successively by the order of DTV broadcast mode, mobile communication mode and mobile text message service pattern.
Description of drawings
By the preferred embodiment that invention will be described in detail with reference to the attached drawing, above-mentioned purpose of the present invention and other characteristics will become apparent.
Fig. 1 is the diagrammatic sketch of the structure of expression TDS-OFDM code element;
Fig. 2 is to use the block diagram of the OFDM receiving system of traditional TDS-OFDM;
Fig. 3 is the block diagram according to the OFDM receiving system of the embodiment of the invention;
Fig. 4 is the block diagram according to the OFDM transmitter that is used for the OFDM receiving system of the embodiment of the invention;
Fig. 5 is the diagrammatic sketch that the additional information of expression from the OFDM transmitter of Fig. 4 inserted the structure of the ofdm signal of exporting the unit; With
Fig. 6 is the flow chart of expression according to the example of the operation of OFDM receiving system of the present invention.
Embodiment
Below, with reference to the accompanying drawings the present invention is described in detail.
Fig. 3 is the block diagram of OFDM receiving system according to the preferred embodiment of the invention.This OFDM receiving system receives and handles the signal of being modulated by TDS-OFDM, and has lock unit 100, service mode detecting unit 110, FFT unit 120 and FEC unit 130.
Lock unit 100 is with respect to the signal compensation frequency displacement and the timing slip that receive by antenna.FFT unit 120 will be transformed into frequency-region signal from the time-domain signal of lock unit 100 outputs.FEC unit 130 is corrected in the mistake in the frequency-region signal of FFT unit 120 conversion of being included in that causes in the transmission course.Service mode detecting unit 110 is determined from the service mode of the signal of lock unit 100 inputs.
In said structure, the signal Synchronization that will receive by antenna at lock unit 100, and send it to service mode detecting unit 110.Service mode detecting unit 110 detects the power ratio of the PN sequence information of synchronous signal with respect to ofdm signal, thereby determines service mode with respect to the signal that receives.Therefore, should modulate by TDS-OFDM, and should have the variation level of PN sequence information so that power ratio can change according to scheduled service mode by the signal that OFDM receiving system according to the present invention receives.
For example, as shown in Figure 4, sending signal can produce by the OFDM transmitter.With reference to Fig. 4, the OFDM transmitter comprises that FEC coding unit 200, inverse discrete Fourier transformer inverse-discrete (IDFT) unit 210, GI insert unit 220, pattern information is provided with unit 230, additional information insertion unit 240, shaping filter 250 and radio frequency (RF) amplifying unit 260.
Additional information is inserted unit 240 and will be had the PN sequence information PN ' that in pattern information the level that unit 230 is provided with changeably is set corresponding to the service mode of ofdm signal and be inserted in GI insertion unit 220 and be inserted in the ofdm signal of GI.Shaping filter 250 will insert the signal filtering of unit 240 outputs from additional information.RF amplifying unit 260 is amplified in the ofdm signal of shaping filter 250 filtering.Amplifying signal passes through antenna transmission.
In the OFDM of said structure receiving system, insert PN sequence information PN ' as synchronizing information, it has the level that can change according to given service mode, and the level of on-fixed.More particularly, the level of PN sequence information PN ' can be set changeably according to service mode, and the PN sequence information PN ' that will have a level of setting is inserted into the ofdm signal that has inserted GI.Therefore, before the ofdm signal that recovers to receive, the OFDM receiving system can be determined the service mode of the ofdm signal that the PN sequence information PN ' by the level of the setting that is inserted into ofdm signal receives.Be noted that pattern information is provided with unit 230 and according to service mode the electrical power of PN sequence information PN ' is set changeably, insert unit 240 to provide it to additional information.The OFDM receiving system can detect the power ratio of ofdm signal with respect to PN sequence information PN ', to detect corresponding service mode.
Be noted that service mode can be data, for example DTV broadcast mode, mobile communication mode and mobile text message service pattern.If the service mode of given ofdm signal is DTV broadcast mode, mobile communication mode and mobile text message service pattern, then pattern information is provided with unit 230 and is set to maximum level at the level of DTV broadcast mode PN sequence information PN ', sets gradually in mobile communication mode and mobile text message service pattern to be lower level.For example, if service mode is the DTV broadcast mode, then the power ratio of the relative PN sequence information of ofdm signal PN ' is set to 6dB.If service mode is a mobile communication mode, then power ratio is set to 4dB.If service mode is mobile text message service pattern, then power ratio can be set to 2dB.
Fig. 5 represents to insert from the additional information of Fig. 4 the frame structure of the ofdm signal of unit 240 outputs.With reference to Fig. 5, the frame of ofdm signal comprises PN sequence information PN ', GI and the OFDM code element that the level that unit 230 is provided with changeably can be set in pattern information according to service mode.The OFDM code element is the basic information of recovering from the signal that receives at the OFDM receiving system, and GI is the interval of the interference between the OFDM code element that is used to suppress to send of distributing.As mentioned above, according to the service mode of ofdm signal, the PN sequence information PN ' that unit 230 settings are set in pattern information has variable level.
More detailed description about the OFDM transmitter shown in Fig. 4 and Fig. 5 is disclosed in the 2002-30391 Korean Patent of title for " can work as the OFDM receiving system (OFDM receiving apparatus capable of varying a levelof PN sequence information according to a service mode when inserting to aOFDM signal) that changes the level of PN sequence information when being inserted into ofdm signal according to service mode " of being submitted to by the applicant, and its full content is contained in this.
Fig. 6 is the flow chart of expression according to the example of the operation of OFDM receiving system of the present invention.In Fig. 6, suppose that the OFDM receiving system receives the signal that sends from the OFDM transmitter of Figure 4 and 5.
With reference to Fig. 6, lock unit 100 carries out Frequency Synchronization and time synchronized (S400) with respect to the signal that receives by antenna.Be sent to service mode detecting unit 110 at lock unit 100 synchronous signals, service mode detecting unit 110 detects the power ratio (S410) of PN sequence information PN '.Power ratio refers to the power ratio of PN sequence information PN ' with respect to GI and OFDM code element.
At first, consider error range, service mode detecting unit 110 determines whether that power ratio is 6dB (S420).Error range has also been considered in the definite processing of other of back.More particularly, if determine that the power ratio of PN sequence information is 6dB, then service mode detecting unit 110 determines that service mode is DTV broadcast mode (S430).If determine it is not 6dB in step S420 power ratio, then service mode detecting unit 110 determines whether that power ratio is 4dB (S440).If power ratio is 4dB, determine that then service mode is mobile communication mode (S450).On the other hand, if power ratio is not 4dB, then service mode detecting unit 110 determines whether that power ratio is 2dB (S460).If power ratio is defined as 2dB, then service mode detecting unit 110 determines that service mode is a mobile text message service pattern (S470), otherwise, finish deterministic process.
Therefore, the definite result according to service mode detecting unit 110 carries out signal processing.More particularly, if the OFDM receiving system is to be used for DTV broadcasting, then the definite result according to service mode detecting unit 110 has only recovery ofdm signal when service mode is the DTV broadcast mode.If service mode is not the DTV broadcast mode, then ignore the signal that receives.Therefore, can ignore unnecessary signal processing.When the OFDM receiving system is used for mobile communication environment or mobile text message service environment, carry out same treatment as above.Therefore, owing to after synchronously, can promptly detect the service mode of corresponding signal, so can reduce unnecessary processing.In addition, can save for example electrical power of signal source.
Though several preferred embodiments of the present invention is explained as the example of service mode with DTV broadcast mode, mobile communication mode and mobile text message service pattern, but the kind of service mode is not limited to them, and other multiple service mode also can be used.
Although represent and described the present invention with reference to certain preferred embodiment of the present invention, but it should be appreciated by those skilled in the art, under the situation that does not break away from the spirit and scope of the present invention that are defined by the following claims, can carry out the various modifications of form and details to it.
Claims (24)
1, a kind of OFDM receiving system comprises:
Lock unit is used for receiving broadcast signal, and the signal that output frequency is offset and timing slip is compensated;
The service mode determining unit is used for determining the service mode of described broadcast singal;
The FFT unit will be a frequency-region signal from the signal transformation of lock unit output, and the signal of output transform;
The FEC unit is used for the signal after the described conversion is carried out error correction decoding,
Wherein, the described broadcast singal that is received by the OFDM receiving system has the PN sequence information, and described PN sequence information has and the corresponding power level of the service mode of the described broadcast singal that receives.
2. OFDM receiving system as claimed in claim 1, wherein, described service mode is a kind of in DTV pattern, mobile communication mode and the mobile text message service pattern.
3, OFDM receiving system as claimed in claim 2, wherein, the power level of described PN sequence information reduces according to the order of DTV broadcast mode, mobile communication mode and mobile text message service pattern.
4, a kind of OFDM method of reseptance comprises the steps:
Receiving broadcast signal is carried out synchronously the broadcast singal that receives, and the signal that output frequency is offset and timing slip is compensated;
Determine the service mode of described broadcast singal;
To be frequency-region signal by synchronous signal transformation, and the signal behind the output transform;
Signal after the described conversion is carried out the FEC error correction decoding,
Wherein, described broadcast singal has the PN sequence information, and described PN sequence information has and the corresponding power level of the service mode of the described broadcast singal that receives.
5, OFDM method of reseptance as claimed in claim 4, wherein, described service mode is a kind of in DTV pattern, mobile communication mode and the mobile text message service pattern.
6, OFDM method of reseptance as claimed in claim 5, wherein, the power level of described PN sequence information reduces according to the order of DTV broadcast mode, mobile communication mode and mobile text message service pattern.
7, a kind of receiver that is used to receive the broadcast singal that sends by channel comprises:
Receiving element, be used to receive broadcast singal with PN sequence information, described PN sequence information has and the corresponding power level of the service mode of described broadcast singal, and wherein, other service mode of described broadcast singal is corresponding to the different capacity level of described PN sequence information;
Demodulating unit is used for the described broadcast singal of demodulation;
Decoding unit is used to proofread and correct the broadcast singal of described demodulation.
8, receiver as claimed in claim 7 also comprises:
Determining unit is used for determining the service mode of described broadcast singal.
9, receiver as claimed in claim 7 also comprises:
Lock unit is used to receive described broadcast singal, and the signal that output frequency is offset and timing slip is compensated.
10, receiver as claimed in claim 7, wherein, described decoding unit is the FEC unit.
11, receiver as claimed in claim 7, wherein, described service mode is a kind of in DTV pattern, mobile communication mode and the mobile text message service pattern.
12, receiver as claimed in claim 7, wherein, the power level of described PN sequence information reduces according to the order of DTV broadcast mode, mobile communication mode and mobile text message service pattern.
13, a kind of method of reseptance that is used to receive the broadcast singal that sends by channel comprises the following step of step:
Reception has the broadcast singal of PN sequence information, and described PN sequence information has and the corresponding power level of the service mode of described broadcast singal, and wherein, other service mode of described broadcast singal is corresponding to the different capacity level of described PN sequence information;
The described broadcast singal of demodulation;
Proofread and correct the broadcast singal of described demodulation.
14, method of reseptance as claimed in claim 13 also comprises the step of the service mode of determining described broadcast singal.
15, method of reseptance as claimed in claim 13 comprises that also described broadcast singal of reception and output frequency are offset and the step of the signal that timing slip is compensated.
16, method of reseptance as claimed in claim 13, wherein, described decoding is a fec decoder.
17, method of reseptance as claimed in claim 13, wherein, described service mode is a kind of in DTV pattern, mobile communication mode and the mobile text message service pattern.
18, method of reseptance as claimed in claim 13, wherein, the power level of described PN sequence information reduces according to the order of DTV broadcast mode, mobile communication mode and mobile text message service pattern.
19, a kind of receiver that is used to receive the broadcast singal that sends by channel comprises:
Be used to receive the receiving system of broadcast singal with PN sequence information, described PN sequence information has and the corresponding power level of the service mode of described broadcast singal, wherein, other service mode of described broadcast singal is corresponding to the different capacity level of described PN sequence;
The demodulating equipment that is used for the described broadcast singal of demodulation;
Be used to proofread and correct the decoding device of the broadcast singal after the described demodulation.
20, receiver as claimed in claim 19 also comprises definite device of the service mode that is used for determining described broadcast singal.
21, receiver as claimed in claim 19 also comprises the synchronizer that is used to receive the signal that described broadcast singal and output frequency skew and timing slip compensated.
22, receiver as claimed in claim 19, wherein, described decoding device is the fec decoder device.
23, receiver as claimed in claim 19, wherein, described service mode is a kind of in DTV pattern, mobile communication mode and the mobile text message service pattern.
24, receiver as claimed in claim 19, wherein, the power level of described PN sequence information reduces according to the order of DTV broadcast mode, mobile communication mode and mobile text message service pattern.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030042666A KR101001620B1 (en) | 2003-06-27 | 2003-06-27 | OFDM receiving apparatus and receiving method thereof |
| KR1020030042666 | 2003-06-27 | ||
| KR10-2003-0042666 | 2003-06-27 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100498193A Division CN100563229C (en) | 2003-06-27 | 2004-06-25 | Orthogonal frequency diversity receiver and method of reseptance thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1968247A true CN1968247A (en) | 2007-05-23 |
| CN1968247B CN1968247B (en) | 2010-05-19 |
Family
ID=34587776
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101468705A Active CN1968247B (en) | 2003-06-27 | 2004-06-25 | OFDM receiver and receiving method thereof |
| CNB2004100498193A Active CN100563229C (en) | 2003-06-27 | 2004-06-25 | Orthogonal frequency diversity receiver and method of reseptance thereof |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100498193A Active CN100563229C (en) | 2003-06-27 | 2004-06-25 | Orthogonal frequency diversity receiver and method of reseptance thereof |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101001620B1 (en) |
| CN (2) | CN1968247B (en) |
| HK (1) | HK1109522A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010045852A1 (en) * | 2008-10-24 | 2010-04-29 | 中兴通讯股份有限公司 | Method and device for transmitting a synchronous signal sequence |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101743752B (en) * | 2007-07-12 | 2013-02-13 | Lg电子株式会社 | Apparatus for transmitting and receiving a signal and a method of transmtiing and receiving a signal |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6487252B1 (en) * | 1999-01-29 | 2002-11-26 | Motorola, Inc. | Wireless communication system and method for synchronization |
| CN1317903A (en) * | 2001-04-27 | 2001-10-17 | 清华大学 | Time domain synchronized orthogonal frequency-division complex modulation method |
| CN1142644C (en) * | 2001-08-17 | 2004-03-17 | 清华大学 | Filling method of protecting gap in orthogonal frequency division multiplexing modulation system |
-
2003
- 2003-06-27 KR KR1020030042666A patent/KR101001620B1/en active IP Right Grant
-
2004
- 2004-06-25 CN CN2006101468705A patent/CN1968247B/en active Active
- 2004-06-25 CN CNB2004100498193A patent/CN100563229C/en active Active
-
2007
- 2007-11-23 HK HK07112792.8A patent/HK1109522A1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010045852A1 (en) * | 2008-10-24 | 2010-04-29 | 中兴通讯股份有限公司 | Method and device for transmitting a synchronous signal sequence |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20050001102A (en) | 2005-01-06 |
| CN100563229C (en) | 2009-11-25 |
| HK1109522A1 (en) | 2008-06-06 |
| CN1968247B (en) | 2010-05-19 |
| KR101001620B1 (en) | 2010-12-17 |
| CN1578288A (en) | 2005-02-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101336522B (en) | Apparatus and method for carrier frequency synchronization in an OFDM system | |
| EP2253113B1 (en) | Detection of a dvb-t2 preamble having frequency-shifted prefix and suffix | |
| CN110086742B (en) | Receiver and method for recovering payload data in a received signal | |
| CN100589468C (en) | Method and apparatus for modulating-demodulating OFDM multi-carrier-wave signal time frequency | |
| EP2193625B1 (en) | Time-frequency synchronization and frame number detection for dmb-t systems | |
| EP1479186B1 (en) | Method and system for receiving a multi-carrier signal | |
| CN101453441B (en) | Robust integral time carrier wave frequency offset estimator | |
| CN101079862A (en) | OFDM receiver | |
| CN1193875A (en) | Apparatus for correcting frequency offset in OFDM receiving system | |
| CN109314687B (en) | Reception of signalling data in frequency division multiplex broadcasting system | |
| CN1346186A (en) | Equipment and method for compensation frequency shift in orthogonal FDMS | |
| CN101075829A (en) | Method for estimating channel of orthogonal frequency-division multiplexing system | |
| CN1574821A (en) | TDS-OFDM receiver and signal processing method thereof | |
| CN1317903A (en) | Time domain synchronized orthogonal frequency-division complex modulation method | |
| CN1225906C (en) | Method for making synchronization by utilizing time domain spread spectrum beacon in digital video broadcast | |
| CN1466292A (en) | OFDM transmitter and method for inserting pilot frequency into OFDM signal | |
| CN1968247B (en) | OFDM receiver and receiving method thereof | |
| CN1434587A (en) | Synchronous method and equipment for orthogonal FDM modulation system | |
| CN101098151A (en) | Method for receiving broadcasting signal | |
| CN1578291A (en) | Symbol timing recovering apparatus for quadrature frequency division multiplexing receiver | |
| US7065171B1 (en) | Method for synchronization of received signals | |
| CN100417052C (en) | Orthogonal frequency dividing multiplexing transmitter and method for treating orthogonal frequency dividing multiplexing signal | |
| CN1466293A (en) | Receive property improved OFDM transmitter and method for treating said signal | |
| CN100397889C (en) | Orthogonal frequency-division multiplying transmitter able to improve transmitting efficiency, and its signal processing method | |
| CN100440763C (en) | Synchronous orthogonal frequency-division multiplexing transmitter, and method of inserting guard spacing in symbol |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| REG | Reference to a national code |
Ref country code: HK Ref legal event code: DE Ref document number: 1109522 Country of ref document: HK |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| REG | Reference to a national code |
Ref country code: HK Ref legal event code: GR Ref document number: 1109522 Country of ref document: HK |