CN102307069A - System and method for compensating OFMD (orthogonal frequency division multiplexing) signal dispersion - Google Patents
System and method for compensating OFMD (orthogonal frequency division multiplexing) signal dispersion Download PDFInfo
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- CN102307069A CN102307069A CN201110273175A CN201110273175A CN102307069A CN 102307069 A CN102307069 A CN 102307069A CN 201110273175 A CN201110273175 A CN 201110273175A CN 201110273175 A CN201110273175 A CN 201110273175A CN 102307069 A CN102307069 A CN 102307069A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/25133—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion including a lumped electrical or optical dispersion compensator
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/223—Demodulation in the optical domain
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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
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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
- H04L27/2697—Multicarrier modulation systems in combination with other modulation techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
- H04L27/3872—Compensation for phase rotation in the demodulated signal
Abstract
The invention provides a system and method for compensating OFMD (orthogonal frequency division multiplexing) signal dispersion. The method comprises the step of respectively correcting the angles of constellation clusters of the data on each OFMD subcarrier, wherein, for each subcarrier, the corrected angles of all the data on the subcarriers are same. By adopting the technical scheme provided by the invention, on the condition that training codes are added for correcting, a deviation of the constellation cluster on each subcarrier relative to the correct position is relatively smaller; and therefore, if the deviations of the subcarrier constellations can be directly corrected, the residual dispersion of the system can be compensated without adding additional training codes.
Description
Technical field
The present invention relates to optical communication field, relate in particular to the system and method for light OFDM (orthogonal frequency division multiplexi) signal dispersion compensation.
Background technology
In optical communication system, because the existence of fiber dispersion effects, the transmission speed of each different frequency composition in optical fiber is different, therefore in the process of transmission, can produce between the adjacent symbol and crosstalk.For digital signal, problem that this can cause that decision region narrows down etc., and will directly cause the mistake of restituted signal for the such analog signal of light QPSK (QPSK signal)-ofdm system.In the QPSK-OFDM system, utilize the character of discrete Fourier transform, in sending signal, add Cyclic Prefix, and in data flow, add midamble code, compensate by this method in the transmission course because the influence that chromatic dispersion brings.In addition, in the real system, especially in optical-fiber network; The variation of route will make transmission link length change; And the characteristic of ofdm system bandwidth flexible allocation makes that also signal bandwidth changes often, so the dispersion values of system is not a steady state value.Add midamble code and receive The noise, after overcorrect, still have residual dispersion, therefore need periodic dispersion variation of adding midamble code usually with real-time tracking system.Classical OFDM frame structure is as shown in Figure 1.In the actual light QPSK-OFDM system, need the periodic midamble code of adding with the dispersion variation of tracking system in real time, the redundancy that this has increased system has to a certain extent reduced efficiency of transmission.
In the system transmissions process of reality, reduced training sequence after because the time varying characteristic of chromatic dispersion makes the constellation group that receives signal to rotate, make constellation group deform, as shown in Figure 2.When the QPSK-OFDM signal was not out of shape, it is circular that the constellation group of each quadrant should be tending towards, and like Fig. 2 a, when constellation group rotates, all is out of shape for ellipse at each quadrant, and like Fig. 2 b, this rotation possibly cause error code.But because system's sub-carriers number is very many, the occupied frequency range of each subcarrier is very little, and for some definite subcarriers, the influence of chromatic dispersion just can be ignored so.Even therefore under the situation that the fluctuation of dispersive influence or dispersion measure is arranged, the quality of the constellation of data group all is relatively preferably on each subcarrier, chromatic dispersion just makes the constellation of subcarrier roll into a ball the deviation that there is an angle relative tram; Shown in Fig. 3 a, each subcarrier should be positioned at all quadrants center in the constellation group of each quadrant, promptly for first quartile; Constellation group should be near π/4, and for second quadrant, constellation group should be near 3 π/4; For third quadrant; Constellation group should be near 5 π/4, and for four-quadrant, constellation group should be near 7 π/4; When angular deviation that chromatic dispersion causes, the constellation of each quadrant is rolled into a ball relative center and has all been rotated certain angle, as being the certain angle that turned clockwise among Fig. 3 b, is to be rotated counterclockwise certain angle among Fig. 3 c.
Summary of the invention
The present invention provides a kind of system and method for ofdm signal dispersion compensation, and with the characteristics of directly utilizing transmission signals itself, correction compensates to system dispersion, reduces the midamble code interpolation thereby reach, and improves the purpose of efficiency of transmission.
The present invention provides a kind of method of orthogonal frequency division multiplexi ofdm signal dispersion compensation, comprising:
Constellation group to data on each OFDM subcarrier carries out angle correct respectively, and for each subcarrier, the correction angle of all data is identical on this subcarrier.
Further; Calculate the argument of all data on each subcarrier; All data are divided into M constellation group; Calculate the argument of each constellation group data center's point and the differential seat angle between the standard signal argument afterwards, and find a deflection angle to make that the average deviation between each constellation cluster centre point argument and the standard signal argument is minimum, and the argument of all data in this constellation group is proofreaied and correct according to said deflection angle.
Further, the argument of said constellation cluster centre point data is the mean value of all data arguments during said constellation is rolled into a ball.
Further, said method is applicable to the modulation system of phase shift keying PSK.
Further, said M=2
n
Further, when modulation system was QPSK, M was 4, and when modulation system was BPSK, M was 2, and when modulation system was 8PSK, M was 8.
Further, the said method that all data are divided into M constellation group is:
According to from small to large sequence arrangement, the difference of computation sequence every adjacent two arguments of arranging finds maximum M individual then in these argument differences then, as the boundary all constellation point is divided into M constellation group with the argument of all data on the subcarrier.
The present invention also provides a kind of system of orthogonal frequency division multiplexi ofdm signal dispersion compensation, and said system comprises correction module;
Said correction module is used for the constellation group of data on each OFDM subcarrier is carried out angle correct respectively, and for each subcarrier, the correction angle of all data is identical on this subcarrier.
Further, said system also comprises computing module;
Said computing module; Be used to calculate the argument of all data on each subcarrier; And all data are divided into M constellation group; Calculate the argument of each constellation group data center's point and the differential seat angle between the standard signal argument afterwards, and find a deflection angle to make that the average deviation between each constellation cluster centre point argument and the standard signal argument is minimum;
Said correction module is that the argument of all data in this constellation group is proofreaied and correct according to said deflection angle.
Further, the argument of said constellation cluster centre point data is the mean value of all data arguments during said constellation is rolled into a ball.
Further, said system is applicable to the modulation system of phase shift keying PSK.
Further, said M=2
n
Further, when modulation system was QPSK, M was 4, and when modulation system was BPSK, M was 2, and when modulation system was 8PSK, M was 8.
Further; Said computing module with the mode that all data are divided into M constellation group is: computing module with the argument of all data on the subcarrier according to from small to large sequence arrangement; The difference of computation sequence every adjacent two arguments of arranging then; In these argument differences, find maximum M then, all constellation point are divided into M constellation group as the boundary.
Adopt technical scheme of the present invention; Adding under the situation that midamble code carried out proofreading and correct; Constellation group on each subcarrier is all less relatively with respect to the deviation of tram; Therefore, if the direct this deviation of syndrome carrier constellation just can compensate by the residual dispersion to system under the situation of not extra interpolation midamble code.
Description of drawings
Fig. 1 is an OFDM frame structure classical in the prior art;
Fig. 2 a is the constellation group that OFDM-QPSK does not have distortion;
Fig. 2 b causes the constellation point distortion because of chromatic dispersion;
Fig. 3 a is the sketch map that the constellation group of subcarrier does not rotate;
It among Fig. 3 b the turned clockwise sketch map of certain angle of the constellation group of subcarrier;
It among Fig. 3 c the sketch map that the constellation group of subcarrier has been rotated counterclockwise certain angle;
Fig. 4 system embodiment structural representation of the present invention;
Fig. 5 is the implementation step of the inventive method embodiment based on the dispersion correction algorithm of constellation group rotation;
Fig. 6 is the dispersion compensation algorithm effect that rotates based on OFDM-QPSK constellation group in the application example one of the present invention.
Fig. 7 is the dispersion compensation algorithm effect that rotates based on OFDM-BPSK constellation group in the application example two of the present invention.
Embodiment
The present invention provides a kind of system and method for ofdm signal dispersion compensation, the constellation of data on each OFDM subcarrier is rolled into a ball carried out angle correct respectively, and for each subcarrier, the correction angle of all data is identical on this subcarrier.
System embodiment
Present embodiment provides a kind of system of orthogonal frequency division multiplexi ofdm signal dispersion compensation, and is as shown in Figure 4, comprises correction module, can further include computing module;
Correction module is used for the constellation group of data on each OFDM subcarrier is carried out angle correct respectively, and for each subcarrier, the correction angle of all data is identical on this subcarrier.
Further, computing module is used to calculate the argument of all data on each subcarrier, and all data are divided into M constellation group, calculates the argument of each constellation group data center's point and the difference between the standard signal argument afterwards;
Correction module is that the argument of all data in this constellation group is proofreaied and correct according to said difference.
Further, the argument of constellation cluster centre point data is the mean value of all data arguments during said constellation is rolled into a ball.
Further, M=2
nParticularly, when modulation system was QPSK, M was 4, and when modulation system was BPSK, M was 2, and when modulation system was 8PSK, M was 8.
Further; Computing module with the mode that all data are divided into M constellation group is: computing module with the argument of all data on the subcarrier according to from small to large sequence arrangement; The difference of computation sequence every adjacent two arguments of arranging then; In these argument differences, find maximum M then, all constellation point are divided into M constellation group as the boundary.
Method embodiment
Present embodiment provides a kind of method of orthogonal frequency division multiplexi ofdm signal dispersion compensation, the constellation of data on each OFDM subcarrier is rolled into a ball carried out angle correct respectively, and for each subcarrier, the correction angle of all data is identical on this subcarrier.
This method is applicable to the modulation system of PSK, comprises QPSK-OFDM, BPSK-OFDM, and 8PSK-OFDM, as shown in Figure 5, adjusting pin is proofreaied and correct the data on the independent subcarrier as follows, for each subcarrier, may further comprise the steps:
S401: extract the data on this subcarrier;
S402: the argument of calculating all data on the subcarrier;
S403: then with these angle values according to from small to large sequence arrangement;
S404: with all data of this subcarrier according to its argument size distribution M constellation group.
In this step; The method that data is divided into M constellation group is: with the argument of all data on the subcarrier according to from small to large sequence arrangement; The difference of computation sequence every adjacent two arguments of arranging then; In these argument differences, find maximum M then, all constellation point are divided into M constellation group as the boundary.
S405: for each constellation group, calculate the mean value of each data argument in the constellation group respectively, this mean value is the argument value of this constellation cluster centre point.
S406: the differential seat angle between the psk signal argument of two constellation cluster centre point argument values of comparison and standard; Find a deflection angle to make that the average deviation between each constellation cluster centre point argument and the standard P SK argument is minimum then;
S407: the argument difference that calculates above the employing is rotated operation to constellation groups all on the subcarrier.
Below further describe the inventive method through application example
Application example one
Should use instance corresponding to OFDM-QPSK, the prerequisite that this programme is implemented is that after having used Cyclic Prefix and midamble code, the anglec of rotation of each quadrant constellation group that the residual dispersion of system causes is less than 45 degree.More after a little while, under the influence of chromatic dispersion time-varying characteristics, receiving in the signal has more residual dispersion at training sequence, makes the constellation group that receives signal be out of shape, as shown in Figure 2.
S501: extract the data on this subcarrier;
S502: the argument of calculating all data on the subcarrier;
S503: then with these angle values according to from small to large sequence arrangement.
S504: with all data of this subcarrier according to its argument size distribution M constellation group, this moment, M was 4, promptly this moment data was divided into 4 constellation groups, corresponding four quadrants.
Division methods specifically can be: the difference of every adjacent two arguments that first computation sequence is arranged, in these argument differences, find maximum four then, and as the boundary all constellation point are divided into four major parts, just four of the QPSK signal constellation groups.
S505: calculate the mean value of each data argument in each constellation group respectively, this mean value is the argument value of this constellation cluster centre point.
S506: for each the constellation group that divides, the differential seat angle between the QPSK signal argument of comparison constellation cluster centre point argument value and standard; Find a deflection angle to make that the average deviation between each constellation cluster centre point argument and the standard BP SK argument is minimum then;
Particularly: the difference of the QPSK signal argument π of the central point of first quartile and standard/4 relatively; The difference of QPSK signal argument 3 π of the central point of second quadrant and standard/4 relatively; The difference of the relatively difference of QPSK signal argument 5 π of the central point of third quadrant and standard/4, and QPSK signal argument 7 π of four-quadrant central point of comparison and standard/4.
S507: the argument difference that calculates above the employing is rotated operation to constellation groups all on the subcarrier.
Accomplish after the aforesaid operations, the effect of dispersion compensation is as shown in Figure 6, and the angular deviation of the constellation group of each subcarrier data will be dropped to minimum, makes the total constellation group quality of system improve, thereby realizes the purpose of compensate for residual chromatic dispersion.
Application example two
Present embodiment is corresponding to BPSK-OFDM, and the prerequisite that this programme is implemented is that after having used Cyclic Prefix and midamble code, the anglec of rotation of the constellation group that the residual dispersion of system causes is less than 90 degree.Data for each subcarrier are proofreaied and correct according to following steps:
Adjusting pin carries out the data on the independent subcarrier, for each subcarrier:
S601: extract the data on this subcarrier;
S602: the argument of calculating all data on the subcarrier;
S603: then with these angle values according to from small to large sequence arrangement.
S604: with all data of this subcarrier according to its argument size distribution M constellation group, this moment, M was 2.
Concrete grammar can be: the difference of every adjacent two arguments that computation sequence is arranged, in these argument differences, find maximum two then, and as the boundary all constellation point are divided into the two large divisions, just two of bpsk signal constellation groups.
S605: calculate the mean value of each data argument in two constellation groups respectively, this mean value is the argument value of this constellation cluster centre point.
S606: for each constellation group, the differential seat angle between the bpsk signal argument of comparison constellation cluster centre point argument value and standard; And find a deflection angle to make that the average deviation between each constellation cluster centre point argument and the standard BP SK argument is minimum.
Particularly: the difference between the central point of first constellation group of comparison and the bpsk signal argument 0 of standard, the relatively difference between the bpsk signal argument π of the central point of second constellation group and standard.
S607: the argument difference that calculates above the employing is rotated operation to constellation groups all on the subcarrier.
Accomplish after the aforesaid operations, the effect of dispersion compensation is as shown in Figure 7, and the angular deviation of the constellation group of each subcarrier data will be dropped to minimum, makes the total constellation group quality of system improve, thereby realizes the purpose of compensate for residual chromatic dispersion.
The above is merely embodiments of the invention, is not limited to the present invention.The present invention is applicable to the dispersion compensation of all PSK-OFDM signals, like BPSK-OFDM, QPSK-OFDM, 8PSK-OFDM etc.For 8PSK-OFDM, implementation step is M=8 this moment with the step described in above-mentioned embodiment one and the embodiment two.
For a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. the method for an orthogonal frequency division multiplexi ofdm signal dispersion compensation comprises:
Constellation group to data on each OFDM subcarrier carries out angle correct respectively, and for each subcarrier, the correction angle of all data is identical on this subcarrier.
2. the method for claim 1 is characterized in that, said method specifically comprises:
Calculate the argument of all data on each subcarrier; All data are divided into M constellation group; Calculate the argument of each constellation group data center's point and the differential seat angle between the standard signal argument afterwards; And find a deflection angle to make that the average deviation between each constellation cluster centre point argument and the standard signal argument is minimum, and the argument of all data in this constellation group is proofreaied and correct according to said deflection angle.
3. according to claim 1 or claim 2 method is characterized in that:
The argument of said constellation cluster centre point data is the mean value of all data arguments during said constellation is rolled into a ball.
4. the method for claim 1 is characterized in that:
Said method is applicable to the modulation system of phase shift keying PSK.
5. method as claimed in claim 2 is characterized in that:
Said M=2
n
6. like claim 4 or 5 described methods, it is characterized in that:
When modulation system was QPSK, M was 4, and when modulation system was BPSK, M was 2, and when modulation system was 8PSK, M was 8.
7. method as claimed in claim 2 is characterized in that:
The said method that all data are divided into M constellation group is:
According to from small to large sequence arrangement, the difference of computation sequence every adjacent two arguments of arranging finds maximum M individual then in these argument differences then, as the boundary all constellation point is divided into M constellation group with the argument of all data on the subcarrier.
8. the system of an orthogonal frequency division multiplexi ofdm signal dispersion compensation, it is characterized in that: said system comprises correction module;
Said correction module is used for the constellation group of data on each OFDM subcarrier is carried out angle correct respectively, and for each subcarrier, the correction angle of all data is identical on this subcarrier.
9. system as claimed in claim 8 is characterized in that:
Said system also comprises computing module;
Said computing module; Be used to calculate the argument of all data on each subcarrier; And all data are divided into M constellation group; Calculate the argument of each constellation group data center's point and the differential seat angle between the standard signal argument afterwards, and find a deflection angle to make that the average deviation between each constellation cluster centre point argument and the standard signal argument is minimum;
Said correction module is that the argument of all data in this constellation group is proofreaied and correct according to said deflection angle.
10. like claim 8 or 9 described systems, it is characterized in that:
The argument of said constellation cluster centre point data is the mean value of all data arguments during said constellation is rolled into a ball.
11. system as claimed in claim 8 is characterized in that:
Said system is applicable to the modulation system of phase shift keying PSK.
12. system as claimed in claim 9 is characterized in that:
Said M=2
n
13., it is characterized in that like claim 11 or 12 described systems:
When modulation system was QPSK, M was 4, and when modulation system was BPSK, M was 2, and when modulation system was 8PSK, M was 8.
14. system as claimed in claim 9 is characterized in that:
Said computing module with the mode that all data are divided into M constellation group is: computing module with the argument of all data on the subcarrier according to from small to large sequence arrangement; The difference of computation sequence every adjacent two arguments of arranging then; In these argument differences, find maximum M then, all constellation point are divided into M constellation group as the boundary.
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| CN201110273175.6A CN102307069B (en) | 2011-09-15 | 2011-09-15 | A kind of system and method for ofdm signal dispersion compensation |
| PCT/CN2012/081174 WO2013037282A1 (en) | 2011-09-15 | 2012-09-10 | System and method for ofdm signal dispersion compensation |
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| WO2013037282A1 (en) * | 2011-09-15 | 2013-03-21 | 中兴通讯股份有限公司 | System and method for ofdm signal dispersion compensation |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6772181B1 (en) * | 1999-10-29 | 2004-08-03 | Pentomics, Inc. | Apparatus and method for trigonometric interpolation |
| US6874006B1 (en) * | 1999-10-29 | 2005-03-29 | Pentomics, Inc. | Apparatus and method for rectangular-to-polar conversion |
| WO2008040053A1 (en) * | 2006-10-03 | 2008-04-10 | National Ict Australia Limited | Single sideband orthogonal frequency division multiplexed optical fibre transmission |
| US20080123786A1 (en) * | 2006-11-29 | 2008-05-29 | Supat Wongwirawat | Method and apparatus for detecting and correcting modulated signal impairments |
| CN101286757A (en) * | 2008-04-10 | 2008-10-15 | 杭州国芯科技有限公司 | Anti-jamming method and device in phase tracing |
| CN101860507A (en) * | 2009-04-09 | 2010-10-13 | 财团法人工业技术研究院 | Receiving method of optical orthogonal frequency-division multitask signal and receiver thereof |
| CN102055716A (en) * | 2010-12-06 | 2011-05-11 | 武汉邮电科学研究院 | Carrier phase correcting method for QAM modulation |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1905547A (en) * | 2005-07-26 | 2007-01-31 | 北京中电华大电子设计有限责任公司 | Method and apparatus for diversity receiving OFDM signal by time domain oversampling |
| CN101924730B (en) * | 2010-04-14 | 2012-07-04 | 北京理工大学 | Method for correcting phase demodulating error of orthogonal frequency multichannel signal |
| CN102045293A (en) * | 2011-01-20 | 2011-05-04 | 深圳市阿派斯实业有限公司 | Normalization method of demodulating power of constellation diagram at receiving end of OFDM (Orthogonal Frequency Division Multiplexing) system |
| CN102307069B (en) * | 2011-09-15 | 2016-09-28 | 中兴通讯股份有限公司 | A kind of system and method for ofdm signal dispersion compensation |
-
2011
- 2011-09-15 CN CN201110273175.6A patent/CN102307069B/en active Active
-
2012
- 2012-09-10 WO PCT/CN2012/081174 patent/WO2013037282A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6772181B1 (en) * | 1999-10-29 | 2004-08-03 | Pentomics, Inc. | Apparatus and method for trigonometric interpolation |
| US6874006B1 (en) * | 1999-10-29 | 2005-03-29 | Pentomics, Inc. | Apparatus and method for rectangular-to-polar conversion |
| WO2008040053A1 (en) * | 2006-10-03 | 2008-04-10 | National Ict Australia Limited | Single sideband orthogonal frequency division multiplexed optical fibre transmission |
| US20080123786A1 (en) * | 2006-11-29 | 2008-05-29 | Supat Wongwirawat | Method and apparatus for detecting and correcting modulated signal impairments |
| CN101286757A (en) * | 2008-04-10 | 2008-10-15 | 杭州国芯科技有限公司 | Anti-jamming method and device in phase tracing |
| CN101860507A (en) * | 2009-04-09 | 2010-10-13 | 财团法人工业技术研究院 | Receiving method of optical orthogonal frequency-division multitask signal and receiver thereof |
| CN102055716A (en) * | 2010-12-06 | 2011-05-11 | 武汉邮电科学研究院 | Carrier phase correcting method for QAM modulation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013037282A1 (en) * | 2011-09-15 | 2013-03-21 | 中兴通讯股份有限公司 | System and method for ofdm signal dispersion compensation |
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| CN102307069B (en) | 2016-09-28 |
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