CN1574821A - TDS-OFDM receiver and signal processing method thereof - Google Patents
TDS-OFDM receiver and signal processing method thereof Download PDFInfo
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- CN1574821A CN1574821A CNA2004100482975A CN200410048297A CN1574821A CN 1574821 A CN1574821 A CN 1574821A CN A2004100482975 A CNA2004100482975 A CN A2004100482975A CN 200410048297 A CN200410048297 A CN 200410048297A CN 1574821 A CN1574821 A CN 1574821A
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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
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- 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
-
- 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
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Discrete Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
A TDS-OFDM(Time Domain Synchronous-Orthogonal Frequency Division Multiplexing) receiving system and a signal processing method thereof are provided to use pilot signals hidden in a frequency region, thereby accurately estimating frequency offset, time offset and multi-path. A Fourier conversion part converts signals of time region into signals of frequency region. A pilot detection part detects pilot signals hidden in the frequency region. An offset/channel estimation part estimates frequency offset, time offset and channel state based on correlation between the signals of frequency region and the pilot signals. An offset compensation part compensates the estimated frequency offset and the time offset. An equalization part equalizes the signals of frequency region based on the estimated channel state.
Description
Technical field
A kind of digit broadcasting system of relate generally to of the present invention, and be particularly related to time-domain synchronization OFDM (TDS-OFDM) receiver and the signal processing method thereof that the pilot signal of hiding in the subcarrier of a kind of use in frequency domain can improve receptivity.
Background technology
OFDM (OFDM) is a kind of in the multi-carrier modulation method, and it has good performance in multipath or mobile environment.
The utilization of ofdm system by using the multicarrier between carrier wave, have orthogonality to improve frequency.Ofdm system uses multicarrier in wired and radio communication, and the transmission of suitable High Data Rate.If in having the radio communication channel of multipath fading, the duration of transmitting its code element with single-carrier system is short high-speed data, has then increased the weight of inter symbol interference, and has increased the complexity of receiving terminal significantly.
When the element duration that enlarges each subcarrier when multicarrier system was the number of subcarrier, this system can keep data transmission rate, and therefore ability of anti-multipath is strong.
In ofdm system, the multicarrier that has orthogonality between carrier wave is used to improve the utilization of frequency, and transmitting terminal and receiving terminal be this multicarrier of modulating/demodulating respectively, and this has brought and inverse discrete Fourier transformer inverse-discrete (IDFT) and the identical effect of discrete Fourier transform (DFT) (DFT).Therefore, can carry out modulation and demodulation at high speed by using inverse discrete Fourier transformer inverse-discrete (IDFT) and discrete Fourier transform (DFT) (DFT).
The TDS-OFDM system is inserted into synchronizing information such as pseudo noise (PN) sequence in the time domain.Specifically, the TDS-OFDM system uses the synchronizing signal in the time domain to obtain the synchronous of time domain and frequency domain, and carries out channel equalization.Yet the TDS-OFDM system has about the limited receiving system and the shortcoming of mis-behave.
The applicant discloses the patent of exercise question for " having the multicarrier transmission systems and the signal processing method thereof that join the pilot signal in the frequency domain; Multi-carrier transmission system having pilot signal added infrequency domain and signal processing method thereof " on korean patent application 10-2002-59363 number, wherein pilot signal is joined the time domain OFDM signal that is used for transmitting.
Fig. 1 is the block diagram that is presented at 10-2002-59363 number disclosed transmission system of korean patent application.
As shown in FIG. 1, transmission system comprises pilot signal is joined pilot plug-in unit 220 in the time domain OFDM signal.With reference to figure 2, pilot plug-in unit 220 usefulness 1 symbol time identical with I signal and Q signal is respectively with very lower powered I pilot signal P
IWith Q pilot signal P
QBe added to I signal and Q signal.Accumulation with the power of the I pilot signal of predetermined number becomes the power P that the method bigger than the average power of I signal is provided with the I pilot signal
ICan be with the power P of Q pilot signal being set with the method to set up of the power of identical I pilot signal
QAs pilot signal Hidden_Pilot P
IAnd P
QBe added into as in the I of ofdm signal and the Q signal time, form signal as shown in FIG. 3.Mapping (enum) data and pilot signal Hidden_Pilot P
IAnd P
QBe loaded into each in the IDFT point subcarrier.
By IDFT unit 230, has pilot signal Hidden_Pilot P
IAnd P
QOfdm signal be modulated to ofdm signal in the time domain.Ofdm signal in the time domain after the modulation inserts unit 240, synchronizing information insertion unit 250 and shaping filter unit 260 at interval through overprotection and is transferred to wireless channel environment.
Therefore, the demand receiving system is handled the pilot signal Hidden_Pilot P in the subcarrier that is hidden in the frequency domain
IAnd P
Q
Summary of the invention
In order to satisfy above demand, the object of the present invention is to provide a kind of TDS-OFDM receiver and signal processing method thereof that is used for obtaining synchronously and carrying out channel equalization by the hiding pilot signal of use in the subcarrier of frequency domain.
The TDS-OFDM receiver comprises: Fourier transformation unit is used for time-domain signal is transformed into frequency-region signal; The pilot detection unit is used for the pilot signal of detection of concealed at frequency-region signal; Skew/channel estimating unit is used for estimated frequency skew, time migration and channel status; Offset compensating unit is used for frequency shift (FS) and time migration that compensate for estimated goes out; And equalizer, be used for coming balanced frequency-region signal based on the channel status that estimates.
The pilot detection unit comes the pilot signal of detection of concealed based on the correlation between frequency-region signal and the reference pilot signal.The pilot signal that should hide is pseudo noise (PN) sequence.
A kind of signal processing method of multi-carrier receiver comprises: time-domain signal is transformed into frequency-region signal; The pilot signal of detection of concealed in frequency-region signal; Estimated frequency skew, time migration and channel status; Frequency shift (FS) that compensate for estimated goes out and time migration; With balanced frequency-region signal based on the channel status that estimates.
Carry out the detection pilot signal based on the correlation between frequency-region signal and the reference pilot signal.
Therefore, be hidden in the pilot signal more skew of high accuracy ground estimated frequency, time migration and multipath in the frequency domain, improved receptivity thereby compare with general receiver by use.
Description of drawings
Read the following detailed description in conjunction with the accompanying drawings, above-mentioned purpose of the present invention, other characteristics and advantage will become apparent, wherein:
Fig. 1 is the block diagram that shows traditional multicarrier transmitter;
Fig. 2 is the diagrammatic sketch that is presented at the pilot signal of data-signal in the frequency domain and adding;
Fig. 3 is the diagrammatic sketch that is presented at the data-signal with pilot signal in the frequency domain;
Fig. 4 is the block diagram that shows the multi-carrier receiver of certain embodiment according to the present invention;
Fig. 5 is the flow chart that shows the signal processing method of the multi-carrier receiver of certain embodiment according to the present invention; With
Fig. 6 shows the signal that receives of certain embodiment according to the present invention and the relevant diagrammatic sketch between the reference pilot signal.
Embodiment
Describe the present invention with reference to the accompanying drawings in detail.
Fig. 4 is the block diagram that shows time-domain synchronization OFDM (TDS-OFDM) receiver in the multi-carrier receiver, and the pilot signal that its use is hidden in the subcarrier in the frequency domain is come processing signals.
The TDS-OFDM receiver comprises: detecting unit 415, skew estimation unit 417, synchronizing signal/protection remove unit 419, Fourier transformation unit 421, pilot detection unit 431, skew/channel estimating unit 433, equalizer 435 and forward error correction (FEC) unit 437 at interval at interval for radio frequency (RF) unit 411, offset compensating unit 413, drift repeating transmission (SRRC) filter 414 that is used for the reliability compensation, synchronizing signal/protection.
RF unit 411 becomes baseband signal with the signal transformation that receives.
Offset compensating unit 413 compensates skew about the signal that receives based on the frequency shift (FS) that estimates and time migration.
SRRC filter 414 is identical at the filter of transmitting terminal with use, and shaping pulse to the received signal.
Synchronizing signal/protection detecting unit 415 at interval detects the protection of inserting (GI) at interval, to prevent adjacent symbols and to be included in interference between the pseudo noise as synchronizing signal (PN) sequence in the signal that receives.
Skew estimation unit 417 comes estimated frequency skew and time migration based on detected synchronizing signal.
Removing unit 419 removes detected synchronizing signal and GI at interval in synchronizing signal/protection.
Fourier transformation unit 421 will become the signal the frequency domain from the signal Fourier transform that receives that wherein removes synchronizing signal and GI.
Pilot detection unit 431 is that correlation between the known reference pilot signal is come the pilot signal P of detection of concealed in subcarrier based on the signal in frequency domain with to receiving terminal
IAnd P
Q
Correlation as the PN sequence of general pilot signal has following characteristic: the correlation between the identical PN sequence has peak value, and the correlation between the different PN sequences is " 0 ".Use the correlation properties of PN sequence, can detect the pilot signal P that is hidden in the subcarrier in frequency domain
IAnd P
Q
Skew/channel estimating unit 433 is based on 431 detected correlations reappraise frequency shift (FS) and time migration in the pilot detection unit, and provides frequency shift (FS) and the time migration that reappraises out to offset compensating unit 413.This skew/channel estimating unit 433 is also estimated channel status based on correlation, and channel condition information is provided for equalizer 435.
The multipath that equalizer 435 removes based on the channel condition information that provides in the signal that receives disturbs.
FEC unit 437 is by for the error-detecting system of balanced data signal setting detects mistake, and corrects detected error.
Fig. 5 is the flow chart that shows the signal processing method of the TDS-OFDM receiver of certain embodiment according to the present invention.Describe this signal processing method in detail with reference to figure 5 and Fig. 6, wherein use the pilot signal that is hidden in the subcarrier in frequency domain to improve receptivity.
Offset units 417 uses the PN sequence to come estimated frequency skew and time migration, and this PN sequence is the synchronizing signal in time domain and is included in the signal that receives.In step S511, frequency shift (FS) and time migration that these offset compensating unit 417 compensate for estimated go out.
In step S513, Fourier transformation unit 421 will become frequency-region signal from the signal Fourier transform that receives that wherein removes synchronizing signal and GI.
In step S521, pilot detection unit 431 comes the pilot signal P of detection of concealed in subcarrier by the correlation between frequency-region signal and the reference pilot signal
IAnd P
Q
Fig. 6 has shown the pilot signal P in first subcarrier that is included in the frequency domain
IAnd P
QThe signal that receives.Have by the signal I+P that respectively I pilot signal and Q signal is added to I and Q signal and produces with reference to figure 6, the first subcarriers
IAnd Q+P
Q
The signal I+P that pilot detection unit 431 obtains in first subcarrier
IAnd Q+P
QWith reference pilot signal RP
IAnd RP
QBetween correlation.Reference pilot signal RP
IAnd RP
QIt is the pilot signal in first subcarrier.
If be hidden in the pilot signal P in the signal that receives
IAnd P
QWith reference pilot signal RP
IAnd RP
QIdentical, then this correlation of correlation properties according to the PN sequence becomes peak value.If pilot signal P
IAnd P
QWith reference pilot signal RP
IAnd RP
QInequality, then this correlation of correlation properties according to the PN sequence becomes " 0 ".
For example, the existence of this peak value represents to be hidden in the pilot signal P in first subcarrier
IAnd P
QWith reference pilot signal RP
IAnd RP
QIdentical.Therefore, by from first subcarrier, removing reference pilot signal RP
IAnd RP
Q, only retention data signal I and Q.
As mentioned above, use the correlation properties of PN sequence can detect the pilot signal Hidden_Pilot P that is hidden in from first to N (N represents the number of subcarrier) subcarrier
IAnd P
Q
In step S523, skew/channel estimating unit 433 reappraises frequency shift (FS) and time migration based on correlation, and also estimates channel status.
If be not present in first subcarrier but from second subcarrier, then skew/channel estimating unit 433 estimates that these frequency shift (FS)s are as the frequency shift (FS) corresponding to the interval between first subcarrier and second subcarrier as the peak value of correlation.Skew/channel estimating unit 433 change of the phase component by correlation is in addition come skew estimated time and channel status.
In step S525, offset compensating unit 413 is used frequency shift (FS) and the time migration that reappraises out, is not had the remaining frequencies skew and the time migration of compensation by the Domain Synchronous signal with compensation.
In step S527, equalizer 435 equilibriums are from wherein removing the data-signal I and the Q of pilot signal.
In step S529, FEC unit 437 detects and is corrected in the mistake in the balanced data signal.
Therefore, use Domain Synchronous signal and pilot tone signal to come estimated frequency skew, time migration and channel status, so improved receptivity.
According to certain embodiment of the present invention, be hidden in pilot signal in the frequency domain by use and come more the estimated frequency skew of high accuracy ground, time migration and multipath, improved receptivity so compare with general receiver.
Although show and described some embodiments of the present invention, it should be appreciated by those skilled in the art, not breaking away under principle of the present invention and spirit and the situation, can make a change in the present embodiment by claims and equivalent institute restricted portion thereof.
Claims (6)
1, a kind of by time-domain signal being for conversion into the multi-carrier receiver that frequency-region signal comes processing signals with Fourier transform, comprising:
Fourier transformation unit is used for time-domain signal is transformed into frequency-region signal;
The pilot detection unit is used for the pilot signal of detection of concealed at frequency-region signal;
Skew/channel estimating unit is used for estimated frequency skew, time migration and channel status;
Offset compensating unit is used for frequency shift (FS) and time migration that compensate for estimated goes out; With
Equalizer is used for coming balanced frequency-region signal based on the channel status that estimates.
2, receiver as claimed in claim 1, wherein, the pilot detection unit comes the pilot signal of detection of concealed based on the correlation between frequency-region signal and the reference pilot signal.
3, receiver as claimed in claim 1, wherein, the pilot signal of hiding is pseudo noise (PN) sequence.
4, a kind of by time-domain signal being for conversion into the signal processing method of the multi-carrier receiver of frequency-region signal with Fourier transform, comprising:
Time-domain signal is transformed into frequency-region signal;
The pilot signal of detection of concealed in frequency-region signal;
Estimated frequency skew, time migration and channel status;
Frequency shift (FS) that compensate for estimated goes out and time migration; With
Come balanced frequency-region signal based on the channel status that estimates.
5, method as claimed in claim 4 wherein, is carried out the detection pilot signal based on the correlation between frequency-region signal and the reference pilot signal.
6, method as claimed in claim 4, wherein, the pilot signal of hiding is pseudo noise (PN) sequence.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030040417A KR101042643B1 (en) | 2003-06-20 | 2003-06-20 | ???-???? receiver for processing hidden pilot signal in frequence domain and a method proessing signal thereof |
| KR40417/2003 | 2003-06-20 | ||
| KR40417/03 | 2003-06-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1574821A true CN1574821A (en) | 2005-02-02 |
| CN100518159C CN100518159C (en) | 2009-07-22 |
Family
ID=34510814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100482975A Expired - Fee Related CN100518159C (en) | 2003-06-20 | 2004-06-18 | TDS-OFDM receiver and signal processing method thereof |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR101042643B1 (en) |
| CN (1) | CN100518159C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101317339A (en) * | 2005-10-31 | 2008-12-03 | 诺基亚公司 | Pilot sequence detection |
| WO2010145176A1 (en) * | 2009-06-30 | 2010-12-23 | 中兴通讯股份有限公司 | Device and method for estimating time offset in orthogonal frequency division multiplexing (ofdm) system |
| CN1719815B (en) * | 2004-07-07 | 2011-02-02 | 华为技术有限公司 | Method for estimating and correcting frequency shift and apparatus thereof |
| CN101237436B (en) * | 2007-01-31 | 2011-03-23 | 扬智科技股份有限公司 | A method and circuit for detecting carrier frequency deviation and sampling frequency deviation |
| CN101997804A (en) * | 2009-08-21 | 2011-03-30 | 大唐移动通信设备有限公司 | Method and device for estimating synchronous timing deviation |
| CN101282317B (en) * | 2007-04-02 | 2011-05-11 | 中兴通讯股份有限公司 | Method and apparatus for estimating channel quality |
| US8000379B2 (en) | 2005-07-01 | 2011-08-16 | Panasonic Corporation | Radio communication apparatus |
| CN1838656B (en) * | 2005-03-25 | 2011-10-26 | 韩国电子通信研究院 | Method and apparatus for uplink carrier frequency synchronization and antenna weight vector estimation |
| CN101242199B (en) * | 2008-03-06 | 2012-07-04 | 复旦大学 | Tracking loop for ultra-broadband communication system based on maximal possibility estimation |
| CN108353043A (en) * | 2015-11-05 | 2018-07-31 | 瑞典爱立信有限公司 | Non-robust channel for vehicle application is estimated |
| US10382244B2 (en) | 2017-02-14 | 2019-08-13 | Samsung Electronics Co., Ltd. | System and method for providing time offset and frequency offset estimation for vehicle to everything communication system |
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| KR100246452B1 (en) * | 1997-09-30 | 2000-03-15 | 윤종용 | Apparatus and method for frequency synchronization using orthogonal frequency division multiplexing |
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| KR100376803B1 (en) * | 2000-09-29 | 2003-03-19 | 삼성전자주식회사 | Apparatus for compensating frequency offset and method thereof in orthogonal frequency division multiplexing system |
| KR20030029179A (en) * | 2001-10-05 | 2003-04-14 | 삼성전자주식회사 | OFDM receiver for compensating error of individual phase and common phase about ofdm signal and method thereof |
-
2003
- 2003-06-20 KR KR1020030040417A patent/KR101042643B1/en not_active IP Right Cessation
-
2004
- 2004-06-18 CN CNB2004100482975A patent/CN100518159C/en not_active Expired - Fee Related
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| CN101282317B (en) * | 2007-04-02 | 2011-05-11 | 中兴通讯股份有限公司 | Method and apparatus for estimating channel quality |
| CN101242199B (en) * | 2008-03-06 | 2012-07-04 | 复旦大学 | Tracking loop for ultra-broadband communication system based on maximal possibility estimation |
| WO2010145176A1 (en) * | 2009-06-30 | 2010-12-23 | 中兴通讯股份有限公司 | Device and method for estimating time offset in orthogonal frequency division multiplexing (ofdm) system |
| CN101997804A (en) * | 2009-08-21 | 2011-03-30 | 大唐移动通信设备有限公司 | Method and device for estimating synchronous timing deviation |
| CN101997804B (en) * | 2009-08-21 | 2013-11-06 | 电信科学技术研究院 | Method and device for estimating synchronous timing deviation |
| CN108353043A (en) * | 2015-11-05 | 2018-07-31 | 瑞典爱立信有限公司 | Non-robust channel for vehicle application is estimated |
| CN108353043B (en) * | 2015-11-05 | 2021-01-22 | 瑞典爱立信有限公司 | Robust channel estimation for vehicular applications |
| US10382244B2 (en) | 2017-02-14 | 2019-08-13 | Samsung Electronics Co., Ltd. | System and method for providing time offset and frequency offset estimation for vehicle to everything communication system |
| US10785079B2 (en) | 2017-02-14 | 2020-09-22 | Samsung Electronics Co., Ltd | System and method for providing time offset and frequency offset estimation for vehicle to everything communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20040110038A (en) | 2004-12-29 |
| CN100518159C (en) | 2009-07-22 |
| KR101042643B1 (en) | 2011-06-20 |
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