WO2007108452A1 - 符号評価装置、符号評価方法、無線通信システム、基地局および移動局 - Google Patents
符号評価装置、符号評価方法、無線通信システム、基地局および移動局 Download PDFInfo
- Publication number
- WO2007108452A1 WO2007108452A1 PCT/JP2007/055575 JP2007055575W WO2007108452A1 WO 2007108452 A1 WO2007108452 A1 WO 2007108452A1 JP 2007055575 W JP2007055575 W JP 2007055575W WO 2007108452 A1 WO2007108452 A1 WO 2007108452A1
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- WO
- WIPO (PCT)
- Prior art keywords
- code
- evaluation
- evaluation method
- shift amount
- mobile station
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
-
- 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
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/7097—Direct sequence modulation interference
- H04B2201/709709—Methods of preventing interference
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
Definitions
- Code evaluation apparatus Code evaluation method, wireless communication system, base station, and mobile station
- the present invention uses a code evaluation apparatus, a code evaluation method, and a code sequence selected based on a code evaluation method for evaluating a code used for data transmission, synchronization, and channel estimation in a mobile station or a base station.
- the present invention relates to a wireless communication system, a base station, and a mobile station. Background art
- FIG. 1 An example of a propagation delay profile in a broadband wireless communication system is shown in FIG.
- the horizontal axis represents time (Time (ns)) and the vertical axis represents amplitude (Amplitude).
- Fig. 1 it can be seen that a multipath with large received power is observed from 50ns to 60ns.
- the channel estimation accuracy and data demodulation accuracy deteriorate due to the effects of multipath interference in which multipaths with large received power interfere with each other.
- the autocorrelation characteristics be flat. That is, it is desirable that the function be a constant value when the horizontal axis represents frequency and the vertical axis represents autocorrelation value.
- the autocorrelation value fluctuates greatly with respect to frequency, it is easily affected by noise. In other words, there is a frequency domain where only a high channel estimation accuracy can be obtained and a low channel estimation accuracy, and there is a low frequency channel estimation accuracy. Susceptible to,.
- Golay's Merit Factor (MF) force is generally used as an evaluation value for evaluating a code.
- This autocorrelation function calculates a complex conjugate value that is shifted in time by ⁇ for a given sequence u. In such an autocorrelation function, it is desirable that a peak is detected when the peak is 0 and the deviation increases, but no peak appears.
- MF is a standard evaluation standard for evaluating the characteristics of codes. This function calculates the sum of autocorrelation values for each propagation delay. In this case, the autocorrelation value for each propagation delay amount is calculated with the same weighting.
- Patent Document 2 Cohen. MN, Fox, MR, and Banden, M, "Minimum peak sidelobe pulse compression codes”. Proc. IEEE Int. Radar Conf, 1990, pp. 633-638.
- Non-Patent Document 3 Electronic Information IEICE Technical Report Vol. 125, No. 623 pp. 223— 229 Disclosure of the Invention Problems to be solved by the invention
- the power of each path of a multipath is smaller when the propagation delay time is large than when the propagation delay time is small.
- the autocorrelation value of code 1 (code 1) is 0 to 8 when the chip shift (off-peak chip index) when calculating the autocorrelation value of the code is 0 to 8. , 9, 0, 0, 0, 0, 4, 3, 2, 1, respectively.
- the autocorrelation values of code 2 are 9, 4, 3, 2, 1, 0, 0, respectively. , 0, 0.
- the autocorrelation value is 9 for both codes.
- the autocorrelation value of code 1 When there is a deviation of 6 chips, the autocorrelation value of code 1 is 3, and the autocorrelation value of code 2 is 0. When there is a deviation of 7 chips, the autocorrelation value of code 1 is 2, and the autocorrelation value of code 2 is 0. When there is a deviation of 8 chips, the autocorrelation value of code 1 is 1, and the autocorrelation value of code 2 is 0.
- Another object of the present invention is to provide a radio communication system, a base station, and a mobile station that use a code sequence selected based on a code evaluation method.
- the code evaluation apparatus of the present invention provides:
- An evaluation reference value calculating means for calculating an evaluation reference value for judging the quality of the code based on the weighting coefficient determined according to the propagation delay time
- Judging means for judging the quality of the code based on the evaluation reference value
- One of the features is to have
- the code evaluation method of the present invention includes:
- an evaluation reference value calculating step for calculating an evaluation reference value for judging the quality of the code, and on the basis of the evaluation reference value, A determination step for determining whether the code is good or bad;
- the wireless communication system of the present invention includes:
- One of the features is that a code sequence selected based on the code evaluation method described above is used as a pilot channel pattern.
- the code sequence selected based on the above-described evaluation reference value can be used as a pilot channel pattern.
- the base station of the present invention includes: The code sequence selected based on the code evaluation method described above is divided into a plurality of sequences, the divided sequences are shifted to generate a plurality of pilot channel patterns, and the plurality of pilot channels are assigned to each mobile station.
- One of the features is that it is provided with a pilot channel assignment means to assign to.
- the code sequence selected based on the evaluation reference value described above is divided into a plurality of sequences, the divided sequences are shifted, and a plurality of pilot channels are divided. A pattern can be generated and the multiple pilot channels can be assigned to each mobile station.
- Pilot channel generating means for generating a pilot channel pattern by dividing a code sequence selected based on the above-described code evaluation method into a plurality of sequences and shifting the divided sequences
- the pilot channel generation means selects the shift amount according to a control signal transmitted from the base station or information indicating the shift amount stored in advance.
- the code sequence selected based on the above-described evaluation reference value is divided into a plurality of sequences, and the divided sequences are shifted, so that a plurality of pilot channels are divided. A pattern can be generated.
- a code evaluation apparatus a code evaluation method, and a code selected based on a code evaluation method that can perform code evaluation in consideration of general radio propagation path conditions
- a wireless communication system, a base station, and a mobile station that use a sequence can be realized.
- FIG. 1 is an explanatory diagram showing a relationship between a background and a signal profile in a broadband wireless communication system.
- FIG. 2 is an explanatory diagram showing codes suitable for the no-lot channel.
- FIG. 3 is an explanatory diagram showing the relationship between delay time and average received power.
- FIG. 4 is an explanatory diagram showing an example of evaluation criteria.
- FIG. 5 is a block diagram showing a code evaluation apparatus that works on an embodiment of the present invention.
- FIG. 6 is a flowchart showing a code evaluation method that works on one embodiment of the present invention.
- FIG. 7 is an explanatory diagram showing a comparison between an AGA code related to ACF and a Golay code.
- FIG. 8 is an explanatory diagram showing a comparison between an AGA code related to ACF and a CAZAC code.
- FIG. 9 is an explanatory diagram showing Uncoded BER for E / N in TU.
- FIG. 10 is an explanatory diagram showing Uncoded BER for E / N in HT.
- FIG. 11 is an explanatory diagram showing code sequence allocation to mobile stations.
- FIG. 12 is an explanatory diagram showing a radio communication system according to an embodiment of the present invention.
- FIG. 13 is an explanatory diagram showing a wireless communication system according to an embodiment of the present invention.
- the code evaluation apparatus 100 receives a code generation unit 102, an evaluation value calculation unit 104 to which an output signal of the code generation unit 102 is input, and an output signal of the evaluation value calculation unit 104. Determination unit 106.
- the code generation unit 102 generates a code to be evaluated.
- the code generation unit 102 may use a CAZAC code (for example, see Non-Patent Document 1), a Golay code (for example, see Non-Patent Document 2), an AGA code (for example, a non-patent document) as codes to be evaluated. (See Table 3). Let's generate other codes.
- Evaluation value calculation unit 104 calculates an evaluation reference value using a code to be evaluated. .
- the evaluation value calculation unit 104 calculates the evaluation reference value using Expression (3).
- L is a value dependent on parameters unique to the radio communication system, such as chip rate and carrier frequency.
- L is ⁇ or less.
- the maximum delay spread length is shorter than the pilot code length.
- ratio ( ⁇ ) is a weighting coefficient.
- ⁇ is the propagation delay time.
- the weighting coefficient (indicated by the vector r) can be realized by weighting that attenuates linearly or by applying a negative value. The weighting factor depends on the system, chip rate, and carrier frequency.
- the evaluation reference value is calculated for the above-described code 1 and code 2. That is, as described with reference to FIG. 4, the off-peak chip index is 0 to 8, and the self-interest value of the code 1 is 9, 0, 0, 0, 0, 4, 3, 2 , 1, and the self-interest value of code 2 is ⁇ , 9, 4, 3, 2, 1, 0, 0, 0, 0.
- Equation (4) is defined as a weighting coefficient.
- determination unit 106 determines whether or not a code corresponding to the evaluation reference value can be used in the wireless communication system.
- the determination unit 106 sets a threshold value of an evaluation reference value in advance based on evaluation indexes such as multipath delay spread, propagation environment, and delay spread. Further, the determination unit 106 determines whether or not the evaluation reference value calculated by the evaluation value calculation unit 104 is greater than or equal to a threshold value. When it is equal to or greater than the threshold value, the determination unit 106 determines that the code can be used. On the other hand, if it is equal to or less than the threshold value, the determination unit 106 determines that the code cannot be used.
- the code generation unit 102 generates a code to be evaluated. For example, the code generation unit 102 generates a Kazak code, Golay code, and AGA code as codes to be evaluated (step S602).
- the evaluation value calculation unit 104 calculates the evaluation reference value using the code to be evaluated (step S 604). For example, when the code sequence length is N, the radio communication system-specific parameter is L, the weighting coefficient is ratio (t), and the propagation delay time is, the evaluation reference value calculation unit 104 calculates the formula ( The autocorrelation function is calculated by 1), and the evaluation standard value is calculated by equation (3).
- the determination unit 106 determines whether or not the evaluation reference value calculated by the evaluation value calculation unit 104 is greater than or equal to a predetermined threshold value (step S606).
- step S606 If it is determined that the evaluation reference value is equal to or greater than the threshold (step S606: YES), it is determined that it can be used as a code (step S608).
- step S606 If it is not determined that the evaluation reference value is equal to or greater than the threshold value (step S606: NO), it is determined that it cannot be used as a code (step S610).
- FIG. 7 the horizontal axis indicates the off-peak chip index, and the vertical axis indicates the determination reference value.
- Fig. 7 shows the case where AGA code and Golay code are used as the codes to be evaluated, and when Expression (2) is used as the evaluation function and when Expression (3) is used. .
- the delay spread of the multipath is about 23 chips, and the multipath has a size of about 6 ⁇ s. Therefore, the comparison is made in the range of about 23 chips. In this range, the AGA code is generally smaller.
- Equation (2) which is a conventional evaluation function
- the evaluation value of the AGA code is 3.5.
- the evaluation value of 324dB and Golay code is 3.7281dB, and the value does not change much.
- Equation (3) which is an evaluation function that works on this embodiment
- the evaluation reference value of the AGA code is 6.7113 dB
- the evaluation reference value of the Golay code is 3.5206 dB.
- the characteristics of the AGA code are much better.
- the autocorrelation peak is suppressed more than the Golay code in the multipath delay spread interval, that is, in the interval of about 23 chips. For this reason, the AGA code is better.
- Equation (2) which is a conventional evaluation function
- the evaluation value of the AGA code is 4.2 578 dB
- the evaluation value of the CAZAC code is 12.5327 dB
- the CAZAC code is better Is obtained.
- Equation (3) is an evaluation function that works on the present embodiment
- the evaluation reference value of the AGA code is 10.1082 dB
- the evaluation reference value of the CAZAC code is 8.3657 dB.
- the characteristics of the AGA code are better.
- the code can be selected with more characteristics.
- the evaluation is performed by comparing the bit error rates.
- FIG. 9 and FIG. 10 show a comparison between CAZAC code and AGA code. 9 and 10, the horizontal axis is E / N (dB), and the vertical axis is the bit error rate (Unicoded BER) b 0
- the AGA code is b 0 more than the CAZAC code at the same E / N.
- the error rate can be reduced. In other words, it is clear that better characteristics can be obtained by using the AGA code.
- Radio communication system 400 includes base station 300 and mobile station 200, and uses a code sequence selected based on the above-described code evaluation method as a pilot channel pattern.
- the base station divides the selected code sequence into a plurality of sequences, shifts the divided sequences to generate a plurality of pilot channel patterns, and the plurality of pilot channel patterns. Is assigned to each mobile station.
- the multipath signal of each mobile station power is orthogonal when W is larger than the maximum delay time of the multipath, and can therefore be identified with high accuracy. By doing so, it is possible to increase the number of pilot channel patterns allocated to the mobile station.
- the base station may notify the mobile station of the shift amount, or both the base station and the mobile station may share a common shift amount.
- a mobile station may have a look-up table, and the mobile station may select and transmit the shift amount.
- base station 300 includes control signal generation section 302 and signal demodulation section 304 to which the output signal of control signal generation section 302 is input.
- Base station 300 divides the selected code sequence into a plurality of sequences, shifts the divided sequences to generate a plurality of pilot channel patterns, and moves each of the plurality of pilot channels to each of the mobile stations. Assign to a station.
- Control signal generation section 302 generates a control signal related to the shift amount, and notifies mobile station 200 of the shift amount to be used. For example, the control signal generation unit 302 notifies the mobile station 200 using a downlink control signal. Further, the control signal generation unit 302 inputs information regarding the shift amount to the signal demodulation unit 304. Signal demodulating section 304 demodulates the signal transmitted from mobile station 200 based on the notified shift amount.
- Mobile station 200 includes control signal demodulation section 202 and pilot signal generation section 204 to which the output signal of control signal demodulation section 202 is input.
- Control signal demodulation section 202 demodulates a control signal related to the shift amount transmitted by base station 100. Control signal demodulating section 202 also inputs information on the shift amount to pilot signal generating section 204 from the control signal on the demodulated shift amount.
- the no-lot signal generation unit 204 includes a code shift unit and is based on the notified shift amount! / Turn to generate a pilot signal. For example, pilot signal generation section 204 divides the selected code sequence into a plurality of sequences, shifts the divided sequences by the demodulated shift amount, and generates a pilot channel pattern. Pilot signal generation section 204 transmits the generated pilot signal in the uplink.
- base station 100 includes common table 106 and signal demodulation section 104 connected to common table 106.
- the common table 106 regarding the shift amount stores information on the shift amount.
- Signal demodulating section 104 refers to common table 106, searches for the shift amount selected by mobile station 200, and demodulates the pilot signal from mobile station 200 based on the shift amount.
- the signal demodulator 104 refers to the common table 106 based on the identifier indicating the shift amount stored in the pilot signal and identifies the shift amount.
- Mobile station 200 includes common table 206 and pilot signal generation section 204 connected to common table 206.
- the common table 206 stores shift amount information.
- the pilot signal generation unit 204 includes a code shift unit, selects one of the shift amounts stored in the common table 206, and generates a pilot signal. For example, the pilot signal generation unit 204 divides the selected code sequence into a plurality of sequences, and the divided system The column is shifted by the selected shift amount to generate a pilot channel pattern. In addition, pilot signal generation section 204 transmits a pilot signal generated based on the selected shift amount on the uplink.
- the common table 206 stores a shift amount and an identifier corresponding to the shift amount in association with each other, and the pilot signal generation unit 204 uses the identifier corresponding to the selected shift amount as a pilot signal. Store and send.
- a radio communication system Based on the code evaluation apparatus, code evaluation method, and code evaluation method according to the present invention, a radio communication system, a base station, and a mobile station that use a selected code sequence are applied to the radio communication system. it can.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2007800185307A CN101449480B (zh) | 2006-03-20 | 2007-03-19 | 编码评价装置、编码评价方法、无线通信系统、基站以及移动台 |
US12/293,502 US8139692B2 (en) | 2006-03-20 | 2007-03-19 | Code evaluator, code evaluation method, radio communication system, base station and mobile station |
EP07739018.5A EP1998460A4 (en) | 2006-03-20 | 2007-03-19 | DEVICE AND METHOD FOR EVALUATING CODES, WIRELESS COMMUNICATION SYSTEM, BASE STATION AND MOBILE STATION |
Applications Claiming Priority (2)
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JP2006077815A JP4812478B2 (ja) | 2006-03-20 | 2006-03-20 | 符号評価装置、符号評価方法、無線通信システム、基地局および移動局 |
JP2006-077815 | 2006-03-20 |
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WO2007108452A1 true WO2007108452A1 (ja) | 2007-09-27 |
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PCT/JP2007/055575 WO2007108452A1 (ja) | 2006-03-20 | 2007-03-19 | 符号評価装置、符号評価方法、無線通信システム、基地局および移動局 |
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US (1) | US8139692B2 (ja) |
EP (1) | EP1998460A4 (ja) |
JP (1) | JP4812478B2 (ja) |
KR (1) | KR20090010949A (ja) |
CN (1) | CN101449480B (ja) |
TW (1) | TW200746667A (ja) |
WO (1) | WO2007108452A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011049922A (ja) * | 2009-08-28 | 2011-03-10 | Yamaguchi Univ | 近似同期cdma通信方式 |
Families Citing this family (4)
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US8804790B2 (en) * | 2009-04-26 | 2014-08-12 | Adeptence, Llc | Spread spectrum encoding and decoding |
TWI404380B (zh) | 2010-04-30 | 2013-08-01 | Mstar Semiconductor Inc | 訊號選擇裝置及其方法 |
CN102255622B (zh) * | 2010-05-17 | 2014-07-09 | 晨星软件研发(深圳)有限公司 | 信号选择装置及其方法 |
US8488719B2 (en) | 2010-08-12 | 2013-07-16 | Harris Corporation | Wireless communications device with multiple demodulators and related methods |
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JPH11112466A (ja) * | 1997-10-03 | 1999-04-23 | Canon Inc | スペクトラム拡散通信方法及びスペクトラム拡散通信装置 |
JP2003318704A (ja) * | 2002-04-23 | 2003-11-07 | Tech Res & Dev Inst Of Japan Def Agency | 自己相関性の高い2相コード生成方法 |
JP2006077815A (ja) | 2004-09-07 | 2006-03-23 | Nissan Motor Co Ltd | エネルギ吸収部材及びそれを用いた自動車用フード |
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JPS5834370A (ja) * | 1981-08-25 | 1983-02-28 | Nippon Telegr & Teleph Corp <Ntt> | 多重波分析装置 |
DE19511751C2 (de) * | 1995-03-30 | 1998-07-09 | Siemens Ag | Verfahren zur Rekonstruktion von durch Mehrwegeausbreitung gestörten Signalen |
US5940433A (en) | 1995-06-13 | 1999-08-17 | Ntt Mobile Communications Network, Inc. | Acquisition method and system of spreading code |
US6324159B1 (en) | 1998-05-06 | 2001-11-27 | Sirius Communications N.V. | Method and apparatus for code division multiple access communication with increased capacity through self-noise reduction |
US6567393B2 (en) * | 2001-02-27 | 2003-05-20 | Nokia Networks Oy | Dynamic reselection of CDMA spreading codes |
EP1359678B1 (en) * | 2001-12-12 | 2009-05-20 | Mitsubishi Electric R&D Centre Europe B.V. | Code allocation method in an MC-CDMA telecommunication system |
US6982578B2 (en) * | 2003-11-26 | 2006-01-03 | Micron Technology, Inc. | Digital delay-locked loop circuits with hierarchical delay adjustment |
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2006
- 2006-03-20 JP JP2006077815A patent/JP4812478B2/ja not_active Expired - Fee Related
-
2007
- 2007-03-19 KR KR20087024401A patent/KR20090010949A/ko not_active Application Discontinuation
- 2007-03-19 WO PCT/JP2007/055575 patent/WO2007108452A1/ja active Application Filing
- 2007-03-19 US US12/293,502 patent/US8139692B2/en not_active Expired - Fee Related
- 2007-03-19 CN CN2007800185307A patent/CN101449480B/zh not_active Expired - Fee Related
- 2007-03-19 EP EP07739018.5A patent/EP1998460A4/en not_active Withdrawn
- 2007-03-20 TW TW096109554A patent/TW200746667A/zh unknown
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JPH11112466A (ja) * | 1997-10-03 | 1999-04-23 | Canon Inc | スペクトラム拡散通信方法及びスペクトラム拡散通信装置 |
JP2003318704A (ja) * | 2002-04-23 | 2003-11-07 | Tech Res & Dev Inst Of Japan Def Agency | 自己相関性の高い2相コード生成方法 |
JP2006077815A (ja) | 2004-09-07 | 2006-03-23 | Nissan Motor Co Ltd | エネルギ吸収部材及びそれを用いた自動車用フード |
Non-Patent Citations (5)
Title |
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COHEN. M. N; FOX, M. R; BANDEN, M: "Minimum peak sidelobe pulse compression codes", PROC. IEEE INT. RADAR CONF., 1990, pages 633 - 638 |
D. C. CHU: "Polyphase Codes With Good Periodic Correlation Properties", IEEE TRANS. INFORM. THEORY, vol. IT-18, no. 1, July 1972 (1972-07-01), pages 531 - 533 |
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Cited By (1)
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---|---|---|---|---|
JP2011049922A (ja) * | 2009-08-28 | 2011-03-10 | Yamaguchi Univ | 近似同期cdma通信方式 |
Also Published As
Publication number | Publication date |
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US8139692B2 (en) | 2012-03-20 |
EP1998460A4 (en) | 2014-07-30 |
TW200746667A (en) | 2007-12-16 |
JP4812478B2 (ja) | 2011-11-09 |
KR20090010949A (ko) | 2009-01-30 |
JP2007258838A (ja) | 2007-10-04 |
CN101449480B (zh) | 2013-05-22 |
EP1998460A1 (en) | 2008-12-03 |
US20090290627A1 (en) | 2009-11-26 |
CN101449480A (zh) | 2009-06-03 |
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