CN1574812A - Blind equalizer for multicarrier receiving device and method thereof - Google Patents
Blind equalizer for multicarrier receiving device and method thereof Download PDFInfo
- Publication number
- CN1574812A CN1574812A CNA2004100462632A CN200410046263A CN1574812A CN 1574812 A CN1574812 A CN 1574812A CN A2004100462632 A CNA2004100462632 A CN A2004100462632A CN 200410046263 A CN200410046263 A CN 200410046263A CN 1574812 A CN1574812 A CN 1574812A
- Authority
- CN
- China
- Prior art keywords
- signal
- unit
- error
- additional data
- representation
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The invention relates to a blind equalizer of a multi-carrier receiving device, which comprises a removing unit for the additional data, an FFT unit, a self-adapting equalizing unit, and an error calculating unit; wherein, the removing unit for the additional unit is used to remove the additional data from the multi-carrier signal received, retain only the effective data, and add the additional data into the signal for transmission and reception; the FFT unit is used to calculate the filed effective data to convert the same into frequency domain signals; the self- adapting equalizing unit is intended for equalizing the converted signals based on a predefined mathematical expression; the error calculating unit is used to calculate the errors in the equalized signals received. The self-adopting unit is able to update the predefined mathematical expression by means of the calculated errors. Therefore, the blind equalizer has an advantage of even compensating the channel changing instantaneously.
Description
Technical field
The present invention relates to a kind of blind equalizer (blind equalizer) and method thereof of multicarrier receiver.More particularly, the present invention relates to a kind of like this blind equalizer and method thereof of multicarrier receiver, it uses active data rather than synchronizing signal balanced in frequency domain.
Background technology
Time-domain synchronization OFDM (TDS-OFDM) inserts predetermined information in the time domain frame structure, thereby can be synchronous and balanced by using the OFDM modulation scheme to carry out.Owing in predetermined structure, use pseudo noise (PN) sequence usually, so have the advantage of the quick convergence that is used for synchronous and balanced device.
Fig. 1 is the block diagram of the conventional equalizer of TDS-OFDM frequency domain.Frequency-domain equalizer among Fig. 1 comprises: additional data is removed unit 100, correlation unit 120, the first fast Fourier transform (FFT) unit 110, the 2nd FFT unit 130 and divider 140.Additional data is removed the multi-carrier signal that unit 100 receives time domain, and removes protection (GI) and synchronizing signal at interval, stays valid data.Fig. 3 has shown general TDS-OFDM signal frame.The TDS-OFDM signal comprises PN sequence 300, GI 310 and the valid data 320 as synchronizing signal.The one FFT unit 110 receives time-domain signals, and GI 310 and PN sequence 300 are removed unit 100 by additional data and removed from this time-domain signal, and a FFT unit 110 is transformed to frequency-region signal with time-domain signal.Correlation unit 120 receives the time domain multi-carrier signals, and by relatively obtaining delayed profile with the predetermined reference synchronizing signal from emitter identical with the PN sequence.The 2nd FFT unit 130 is transformed to frequency-region signal with the delayed profile that obtains.The frequency-region signal that divider 140 receives from the first and second FFT unit 110 and 130 calculates the ratio of the signal that receives, and uses the signal of ratio equilibrium after a FFT unit 110 conversion that calculates.
Fig. 2 is the block diagram of the traditional TDS-OFDM frequency-domain equalizer of another kind, and it comprises: multiplexed unit 200, a FFT unit 210, the 2nd FFT unit 220, the 3rd FFT unit 230, first divider 240 and second divider 250.Multiplexed unit 200 receives the multi-carrier signal of time domain, and GI 310 is separated with valid data 320 with PN sequence 300.The one FFT unit 210 receives from multiplexed unit 200 isolated valid data 320, and it is transformed to frequency-region signal.The 2nd FFT unit 220 receives from multiplexed unit 200 isolated PN sequence 300 signals, and it is transformed to frequency-region signal.The 3rd FFT unit 230 receives reference sync signal, and it is transformed to frequency-region signal.First divider 240 is determined channel status by the signal that will receive from the 2nd FFT unit 220 divided by the signal that receives from the 3rd FFT unit 230.Second divider 250 is received in the valid data 320 after the FFT unit conversion, and corresponding to the signal equalization valid data 320 that receive from first divider 240.
It is balanced that above method only uses synchronizing signal.Therefore, can not compensate the channel that changes instantaneously.In addition, in the channel that changes as dynamic channel and mobile channel, equalization function is worsened instantaneously.
Summary of the invention
The objective of the invention is to solve top problem and shortcoming at least, and following advantage is provided at least.Therefore, the object of the present invention is to provide a kind of blind equalizer and equalization methods thereof of multicarrier receiver, itself in addition when channel status changed according to the time, come efficient balance by the valid data that use frequency domain.
In order to realize above-mentioned purpose of the present invention, a kind of blind equalizer of multicarrier receiver is provided, and it comprises: additional data is removed the unit, is used for removing additional data from the multi-carrier signal that receives, and only stay valid data, additional data is added to and is used for transmission and reception in the signal; The FFT unit is used for the valid data computing of filing is transformed to frequency-region signal; The adaptive equalization unit is used for based on the signal after the balanced conversion of predetermined mathematic(al) representation; And error calculation unit, be used for the calculated signals error after the equilibrium that receives, and the adaptive equalization unit is corresponding to the predetermined mathematic(al) representation of the error update that calculates.Additional data comprises synchronizing information and GI.
This blind equalizer also comprises power estimation unit, is used for the power of the signal after the estimation balancing.Error calculation unit is come the error of calculation by the power and the average power that relatively estimate.
In an embodiment of the present invention, this blind equalizer also comprises definite piece, and it is used for the signal after the equilibrium is defined as signal near the value of qam constellation, and wherein, and error calculation unit is come the error of calculation by signal after the equilibrium relatively and the signal of determining.
The adaptive equalization unit uses the judgement direct algorithm, stops walking a kind of mathematic(al) representation that upgrades in algorithm and the Benveniste-Goursat algorithm.
A kind of method that is used for the blind equalizer of multicarrier receiver comprises the steps: to remove the additional data that inserts for transmitting-receiving from the multi-carrier signal that receives, and the valid data that only file; By FFT the valid data computing of filing is transformed to frequency-region signal; Based on the signal after the balanced conversion of predetermined mathematic(al) representation; Calculated signals error after the equilibrium that receives; With the mathematic(al) representation of being scheduled to corresponding to the error update that calculates.Additional data comprises synchronizing information and GI.
This method also comprises the step of the power of the signal after the estimation balancing, and therein, the Error Calculation step is come the error of calculation by the power and the average power that relatively estimate.
This method also comprises the signal after the equilibrium is defined as step near the signal of the value of qam constellation, and wherein, and the Error Calculation step is come the error of calculation by signal after the equilibrium relatively and the signal of determining.
Description of drawings
In conjunction with the drawings its exemplary embodiment is described in detail, above-mentioned purpose of the present invention and other characteristics will become apparent, wherein:
Fig. 1 is the block diagram of the conventional equalizer of TDS-OFDM frequency domain;
Fig. 2 is the block diagram of the another kind of conventional equalizer of TDS-OFDM frequency domain;
Fig. 3 has shown general TDS-OFDM signal frame;
Fig. 4 is the block diagram according to the blind equalizer of the multicarrier receiver of the embodiment of the invention;
Fig. 5 is the block diagram according to the blind equalizer of the multicarrier receiver of the embodiment of the invention;
Fig. 6 is the flow chart that the operation of the multicarrier receiver among Fig. 4 is shown; With
Fig. 7 is the flow chart that the computing of the another kind of multicarrier receiver among Fig. 5 is shown.
In the accompanying drawings, should be appreciated that identical label is meant identical characteristic and structure.
Embodiment
Below, describe the present invention in detail with reference to accompanying drawing.When relating to the parts with same structure and computing in the prior art, these parts are quoted by identical label all the time.
Fig. 4 is the block diagram according to the blind equalizer of the multicarrier receiver of the embodiment of the invention.With reference to Fig. 4, this blind equalizer comprises: additional data is removed unit 400, FFT unit 410, adaptive equalization unit 420, power estimation unit 430 and error calculation unit 440.Additional data is removed unit 400 and is received the TDS-OFDM signal, and removes PN sequence 300 and GI 310, stays valid data 320.FFT unit 410 receives the signal of only remaining valid data 320, and is frequency-region signal by fast fourier transform with this signal transformation.Adaptive equalization unit 420 uses predetermined mathematic(al) representation reception and the signal after the balanced conversion.The power of the signal after power estimation unit 430 estimation balancing.Error calculation unit 440 is come error of calculation value by the power and the average power that relatively estimate.The error that calculates is input to the coefficient that the filter tap of adaptive equalization unit 420 is formed in 420 reflex positions, adaptive equalization unit, and thus, upgrades the mathematic(al) representation that is used for equilibrium.Upgrade for Error Calculation and expression formula and to handle, can adopt among the CMA of sato algorithm, constant modulus algorithm (CMA) and correction any.By the mathematic(al) representation after upgrading, balanced next signal, and equilibrium result upgrades the mathematic(al) representation of the equilibrium of the signal subsequently that is used for this next signal in the same way once more.
Fig. 5 is the block diagram according to the another kind of blind equalizer of the multicarrier receiver of the embodiment of the invention.Blind equalizer among Fig. 5 comprises: additional data is removed unit 500, FFT unit 510, adaptive equalization unit 520, is determined piece 530 and error calculation unit 540.Additional data is removed the additional data of the blind equalizer among unit 500 and 510 execution of FFT unit and Fig. 4 and is removed unit 400 and FFT unit 410 identical operations.The signal that 520 equilibriums of adaptive equalization unit receive from FFT unit 510.Determine that piece 530 receives the signal after the equilibriums from adaptive equalization unit 520, and the signal after should equilibrium is defined as the value of quadrature amplitude modulation (QAM) constellation.For example, if the real number of the output signal of equalizer and imaginary number are 16QAM, this 16QAM has-3 at real number axis and axis of imaginaries, and-1,1,3 constellation is determined piece output (1 ,-3) so.Error calculation unit 540 is by relatively the signal of 520 transmission and definite signal come the error of calculation from the adaptive equalization unit.Adaptive equalization unit 520 uses the balanced mathematic(al) representation of the error update that calculates, and balanced next signal.To the process of Error Calculation and expression formula renewal, preferably can use the judgement direct algorithm, stop walking algorithm and Benveniste-Goursat algorithm.
Fig. 6 is the flow chart that the operation of the multicarrier receiver among Fig. 4 is shown.From the TDS-OFDM signal that receives, remove PN sequence 300 and GI 310 (step S600).The signal of only remaining valid data 320, that is, the signal of having removed PN sequence 300 and GI 310 is received and is transformed to frequency-region signal (step S610).By predetermined mathematic(al) representation reception and the signal (step S620) after the balanced conversion.By the signal (step S625) after the equalizer output equilibrium, and estimate the power (step S630) of this signal.Power that relatively estimates and average power are come the error of calculation (step S640).Be used for balanced mathematic(al) representation (step S650) by this error update.For the renewal of mathematic(al) representation, preferably use the CMA of CMA and correction.By the mathematic(al) representation after upgrading, balanced next signal (step S620).Repeat the step of S620 back.
Fig. 7 is the flow chart of computing that the blind equalizer of the multicarrier receiver among Fig. 5 is shown.Step S700 and S710 are identical with step S600 and S610 among Fig. 6.Signal in step S710 after the conversion comes balanced (step S720) by predetermined mathematic(al) representation.The signal (step S725) of output after the equilibrium, and the signal after should equilibrium is received and is defined as the value (step S730) of qam constellation.Relatively the signal after determined value and the equilibrium comes the error of calculation (step S740).Renewal is used for balanced mathematic(al) representation (step S750).Can use the judgement direct algorithm, stop walking in algorithm and the Benveniste-Goursat algorithm.By the mathematic(al) representation after upgrading, balanced next signal (step S720).
According to more than, use valid data 320 to carry out equilibrium.Even when channel status changed according to the time, also can guarantee high balanced efficient therefore.
Although the present invention describes with reference to its certain embodiments, 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 (10)
1, a kind of blind equalizer of multicarrier receiver comprises:
Additional data is removed the unit, is used for removing additional data from the multi-carrier signal that receives, and only stays valid data, and additional data is added to and is used for transmission and reception in the signal;
The FFT unit is used for the valid data computing of filing is transformed to frequency-region signal;
The adaptive equalization unit is used for based on the signal after the balanced conversion of predetermined mathematic(al) representation; With
Error calculation unit is used for the calculated signals error after the equilibrium that receives; And
The adaptive equalization unit is corresponding to the predetermined mathematic(al) representation of the error update that calculates.
2, blind equalizer according to claim 1, wherein, additional data comprises synchronizing information and protection (GI) at interval.
3, blind equalizer according to claim 1 also comprises:
Power estimation unit is used for the power of the signal after the estimation balancing, and
Wherein, error calculation unit is come the error of calculation by the power and the average power that relatively estimate.
4, blind equalizer according to claim 1 also comprises:
Determine piece, be used for the signal after the equilibrium is defined as signal near the value of qam constellation, and
Wherein, error calculation unit is come the error of calculation by signal after the equilibrium relatively and the signal of determining.
5, blind equalizer according to claim 1, wherein, the adaptive equalization unit use to judge that direct algorithm, stop walking in algorithm and the Benveniste-Goursat algorithm one upgrade mathematic(al) representation.
6, a kind of method that is used for the blind equalizer of multicarrier receiver comprises the steps:
Remove the additional data that inserts from the multi-carrier signal that receives, only stay valid data, additional data is added to and is used for transmission and reception in the signal;
By FFT the valid data computing of filing is transformed to frequency-region signal;
Based on the signal after the balanced conversion of predetermined mathematic(al) representation;
The error of the signal of calculating after from the equilibrium that receives; With
Corresponding to the predetermined mathematic(al) representation of the error update that calculates.
7, method according to claim 6, wherein, additional data comprises synchronizing information and GI.
8, method according to claim 6 also comprises step:
The power of the signal after the estimation balancing, and
Wherein, the Error Calculation step is come the error of calculation by the power and the average power that relatively estimate.
9, method according to claim 6 also comprises step:
Signal after the equilibrium is defined as signal near the value of qam constellation, and
Wherein, the Error Calculation step is come the error of calculation by signal after the equilibrium relatively and the signal of determining.
10, method according to claim 6, wherein, the expression formula step of updating use to judge that direct algorithm, stop walking in algorithm and the Benveniste-Goursat algorithm one upgrade mathematic(al) representation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030036912A KR20040105881A (en) | 2003-06-09 | 2003-06-09 | Blind equalizer of Multi-carrier transmission receiving system and a method thereof |
| KR36912/2003 | 2003-06-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1574812A true CN1574812A (en) | 2005-02-02 |
Family
ID=34510795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100462632A Pending CN1574812A (en) | 2003-06-09 | 2004-06-08 | Blind equalizer for multicarrier receiving device and method thereof |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20040105881A (en) |
| CN (1) | CN1574812A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101022433B (en) * | 2007-03-02 | 2010-05-19 | 清华大学 | High-speed digital receiver parallel adaptive blind equalizing method |
| CN101510860B (en) * | 2009-03-24 | 2012-04-25 | 南京擎天科技有限公司 | Equilibrium method of multi-carrier system |
| CN101547173B (en) * | 2009-05-05 | 2013-02-27 | 南京信息工程大学 | Blind equalization method based on balanced orthometric multi-wavelet |
| CN107018103A (en) * | 2017-04-07 | 2017-08-04 | 淮南职业技术学院 | A kind of small echo norm blind balance method based on the group's optimization of adaptive step monkey |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090035195A (en) * | 2007-10-05 | 2009-04-09 | 엘지전자 주식회사 | Plasma display apparatus |
-
2003
- 2003-06-09 KR KR1020030036912A patent/KR20040105881A/en not_active Application Discontinuation
-
2004
- 2004-06-08 CN CNA2004100462632A patent/CN1574812A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101022433B (en) * | 2007-03-02 | 2010-05-19 | 清华大学 | High-speed digital receiver parallel adaptive blind equalizing method |
| CN101510860B (en) * | 2009-03-24 | 2012-04-25 | 南京擎天科技有限公司 | Equilibrium method of multi-carrier system |
| CN101547173B (en) * | 2009-05-05 | 2013-02-27 | 南京信息工程大学 | Blind equalization method based on balanced orthometric multi-wavelet |
| CN107018103A (en) * | 2017-04-07 | 2017-08-04 | 淮南职业技术学院 | A kind of small echo norm blind balance method based on the group's optimization of adaptive step monkey |
| CN107018103B (en) * | 2017-04-07 | 2020-02-14 | 淮南职业技术学院 | Wavelet constant modulus blind equalization method based on adaptive step size monkey swarm optimization |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20040105881A (en) | 2004-12-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6123584B2 (en) | Coefficient determination device, equalizer, receiver and transmitter | |
| KR100719111B1 (en) | Phaase noise compensation apparatus to be applied OFDM system and method thereof | |
| JP5775639B2 (en) | Receiver for OFDM communication system and phase noise mitigation method thereof | |
| JP2007531379A (en) | Channel estimation method and channel estimator for OFDM / OFDMA receiver | |
| EP1551120A1 (en) | Receiving device, receiving method, and device for measuring transmission channel characteristic | |
| US8295339B2 (en) | Method of estimating inter-carrier interference (ICI) and ICI mitigating equalizer | |
| CN107276923B (en) | Anti-aliasing channel estimation device and method and receiver | |
| JPWO2008099734A1 (en) | Channel estimation apparatus, equalization apparatus, and estimation and equalization method thereof | |
| JP5896795B2 (en) | Equalizer, receiver, and equalization method | |
| KR20090057862A (en) | Method and apparatus of channel estimation | |
| EP1533961A2 (en) | OFDM reception apparatus | |
| WO2006065016A1 (en) | Method for estimating frequency/time offset and apparatus using the same in ofdm communication system | |
| US8447001B2 (en) | Apparatus for performing channel estimation in a receiving device | |
| US20090092038A1 (en) | Timing-offset estimation in modulated signals using weighted correlation values | |
| JP5347203B2 (en) | Method and apparatus for estimating delay spread of multipath channel | |
| JP2012503424A (en) | Channel estimation in OFDM receiver | |
| TWI427957B (en) | Channel estimation method and device using the same | |
| CN104601509B (en) | The timing synchronization device and method of multicarrier modulated signal | |
| CN1574812A (en) | Blind equalizer for multicarrier receiving device and method thereof | |
| CN1638375A (en) | Apparatus, method and computer program for detecting echo in the frequency domain | |
| JP2010124368A (en) | Doppler frequency estimating device, receiving device, program, and method of estimating doppler frequency | |
| EP3136667B1 (en) | Adaptive equalizer and adaptive equalization method | |
| CN109120560B (en) | Self-adaptive ICI inter-carrier interference elimination method and device | |
| JP5460487B2 (en) | OFDM signal receiving apparatus and relay apparatus | |
| KR101089502B1 (en) | ICI Cancellation Method using Time-Varying Channel Information in OFDM Systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |