WO2004021598A1 - 送信信号形成方法、通信方法、及び送信信号のデータ構造 - Google Patents
送信信号形成方法、通信方法、及び送信信号のデータ構造 Download PDFInfo
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- WO2004021598A1 WO2004021598A1 PCT/JP2003/011018 JP0311018W WO2004021598A1 WO 2004021598 A1 WO2004021598 A1 WO 2004021598A1 JP 0311018 W JP0311018 W JP 0311018W WO 2004021598 A1 WO2004021598 A1 WO 2004021598A1
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- Prior art keywords
- transmission data
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- coefficient
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
- H04J13/102—Combining codes
- H04J13/105—Combining codes by extending
-
- 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
-
- 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
- H04B1/709—Correlator structure
- H04B1/7093—Matched filter type
-
- 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
- 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
- H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
Definitions
- the present invention relates to a transmission signal forming method, a communication method using the transmission signal, and a data structure of the transmission signal, and is particularly suitable for a multipath environment such as mobile communication.
- inter-channel interference due to correlation characteristics of a spreading sequence and multipath characteristics of a transmission path is a factor that limits the frequency utilization rate.
- orthogonal frequency division multiplexing OFDM
- OFDM orthogonal frequency division multiplexing
- the transmission signal and the multipath signal can be separated at the same frequency and the same time by using the pilot signal.
- the CMDA method is a multiple access method using a spread spectrum communication method.
- modulation is performed using a spreading code sequence.
- the spreading code sequence for example, a periodic sequence having no autocorrelation is used.
- a spread code sequence that separates the original transmitted signal from the multipath signal Thus, for example, a communication system using a completely complementary sequence has been proposed.
- the sum of the autocorrelation function of each sequence is 0 for all shifts other than 0 shift, and the sum of the cross-correlation function of each sequence is
- This sequence has a cross-correlation characteristic that is always zero.
- a ZCZ peripheral uncorrelated area
- a CDMA signal so that the transmitted signal's periodic spectrum is uncorrelated. ing. Thereby, the same frequency and the same time can be assigned to the pilot signal and the transmission signal.
- the conventional spread spectrum communication system using perfectly complementary sequences has the problem that the amplitude of the digitally modulated radio signal becomes large and a large dynamic range is required. is there.
- FIG. 5 shows an example of a signal using a completely complementary sequence as a spreading code sequence.
- the received signal that has passed through the multipath transmission path is “1, 2, 3, 1, 1, 1, 1,...”. Received as a signal train.
- the amplitude spread of this signal ranges, for example, from 0 to 3, and the receiving-side amplifier needs to have a dynamic range corresponding to this amplitude spread.
- the output signal will be distorted due to the non-linearity of the input / output characteristics of the amplifier, and the frequency band outside the frequency range of the input signal will be distorted. A frequency spectrum is also generated in the frequency band, and the spurious characteristics deteriorate. In addition, the distortion of the output waveform causes intersymbol interference on the receiving side, thereby deteriorating the error rate. Also, in order to amplify the signal using the part with good linearity of the amplifier, Power consumption increases. The increase in power consumption is a factor that shortens the standby time of mobile terminals.
- the present invention has been made to solve the above-mentioned conventional problems, and has an object to reduce the spread of signal amplitude in modulation of transmission data by spread spectrum.
- the purpose is to reduce the dynamic range.
- the spread spectrum itself is devised to make the periodic spectrum of the transmitted signal uncorrelated.
- the present invention focuses on the transmission data sequence instead of the spread sequence itself in the modulation of the transmission data by the spread spectrum as in the related art, and thus, the transmission signal period is reduced.
- the spectrum is uncorrelated.
- the entire signal including data has the role of a spread sequence, thereby reducing the load on the dynamic range.
- a coefficient sequence of a spread sequence is shifted sequentially by one pitch, and a plurality of transmission data are formed by multiplying the transmission data by the plurality of coefficient sequences.
- the transmission data sequence is formed by adding the plurality of transmission data thus formed.
- a plurality of transmission data is formed by multiplying the transmission sequence by the coefficient sequence of the spread sequence and shifting the transmission sequence one pitch at a time, and adding the plurality of formed transmission data to form a transmission data sequence.
- a finite-length signal is formed by multiplying transmission data by a coefficient sequence of a spreading sequence, and this finite-length signal is repeated infinitely. To form an infinite length signal. The transmission data longer than the length of the coefficient sequence is cut out from the infinite length signal to form a transmission data sequence. According to the above-described first or second transmission signal formation mode, transmission data is embedded in the spread sequence.
- the transmission data of the transmission data sequence is set to 0 at every shift in the cyclic cross-correlation function.
- a plurality of transmission data are arranged so that each periodic spectrum of the transmission data sequence is uncorrelated.
- the coefficient sequence used for forming the transmission signal of the present invention can be selected from the z CZ sequence, and can be a coefficient sequence of an arbitrary vector row selected from the complete complementary sequence, and is formed using a DFT matrix. be able to.
- the ZCZ sequence used here is a sequence having a periodic zero-correlation region having zero autocorrelation region characteristics and zero cross-correlation region characteristics.
- a completely complementary sequence may be used as a predetermined coefficient sequence. it can.
- the sum of the autocorrelation function of each sequence is 0 in all shifts except for the 0 shift, and the sum of the cross correlation function of each sequence is always the same in all shifts.
- This sequence has a cross-correlation characteristic of 0.
- the DFT matrix is a discrete Fourier transform matrix, and is a square matrix having orthonormal columns. Different rows of the DFT matrix have the property that their periodic cross-correlation function becomes zero at every shift, and by using the properties of this DFT matrix, a signal created using different rows of the DFT matrix is obtained. Their periodic cross function can be made zero at any shift.
- the present invention uses the property of this DFT matrix to allow mutual interference between periodic signals. Multiple signals can be transmitted at the same time without interference.
- the transmission data sequence formed by the transmission signal forming method of the present invention is transmitted, and the transmission data is received through a matched filter corresponding to the coefficient sequence used to form the transmission data sequence.
- the transmission data sequence is used as a pilot signal for measuring the multipath characteristics, and the multipath characteristics of the transmission path are obtained by receiving the pilot signal. Can be.
- a plurality of transmission data sequences are formed using different coefficient sequences, at least one selected from the transmission data sequences is used as a pilot signal, and another transmission is performed.
- the data string is used as a transmission signal.
- the multipath characteristics are obtained from the pilot signal reception signal, and the transmission data is obtained by removing the multipath characteristics from the transmission signal reception signal using the obtained multipath characteristics.
- the pilot signal and the transmission signal are uncorrelated with each other in the periodic spectrum, and can be separated from each other by passing through a corresponding matched filter.
- the pilot signal can determine the multipath characteristic from the relationship between the transmission signal and the reception signal, and the transmission signal can be determined from the multipath characteristic and the reception signal.
- the data structure of a transmission signal according to the present invention is that a transmission data longer than the length of a coefficient sequence is cut out from an infinite length signal formed by repeating a finite length signal obtained by multiplying the transmission data by a coefficient sequence of a spreading sequence infinitely. It has a transmission data string formed by BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a schematic diagram for explaining a transmission signal forming method according to the present invention and a data structure of the transmission signal according to the present invention.
- FIG. 2 is a diagram illustrating each relationship of a fourth-order DFT matrix.
- FIG. 3 is a diagram for explaining a relationship between a pilot signal and a transmission signal, and
- FIG. 4 is a diagram showing a relationship between a transmission signal and a detection signal, and a correlation.
- FIG. 5 is a diagram showing an example of a signal using a completely complementary sequence as a spreading code sequence. BEST MODE FOR CARRYING OUT THE INVENTION
- BEST MODE FOR CARRYING OUT THE INVENTION BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a schematic diagram for explaining a transmission signal forming method of the present invention and a data structure of the transmission signal of the present invention.
- the length of the spreading sequence is N bits, and the data length of transmission data b is M bits.
- the transmission data b (b0, b1, b2, b3, ..., bMl) (shown in Fig. 1 (a))
- the transmission data (b0, b 1, b2, b3,..., BMl) are multiplied by the respective coefficients of the coefficient sequence (a0, a1,..., aN-1) of the predetermined spreading sequence (Fig. 1 (b) ), Thereby forming a plurality of transmission data BO, B 1,..., BM-1.
- Figure 1 shows the coefficient sequence (a 0, a 1,..., a Nl) of the spreading sequence as (1, 0, ⁇ , 0, j, 0, ⁇ ' ⁇ , 0, —1, 0, ⁇ ⁇ , 0, — j, 0, ⁇ , 0).
- Each coefficient sequence of this spreading sequence is transmitted data b (b0, b1, b2,
- the transmission data BO becomes (b O, 0,..., 0, jb 0, 0,..., 0, — b 0, 0, ⁇ ', 0, — jb 0, 0,..., 0)
- the transmission data B 1 is (bl, 0, ⁇ ⁇ ', 0, jb 1, 0, ⁇ , 0, — b 1, 0,..., 0,- jb 1, 0,..., 0).
- the process of multiplying by each coefficient can be expressed by the Kronecker product, as shown in Fig. 1 (b).
- FIG. 1 (c) shows a finite-length periodic sequence.
- interval between each data sequence b, jb, —b, -jb in data sequence B is arbitrarily determined by the interval between each coefficient in sequence a (for example, Tl, ⁇ 2,). be able to.
- the spreading sequence can be formed by applying a DF ⁇ matrix.
- Figure 2 shows the coefficients of the fourth-order DFT matrix.
- Periodic sequences A to D can be represented using the Kronenet product.
- the periodic sequence c is
- ⁇ ' (1, 0, 0, 0, A, 1, 0, 0, 0)
- the data length of the periodic sequence A ′ is 24 bits, which is the data length of the periodic sequence A plus 16 bits plus 4 bits each.
- This periodic sequence A ′ can be obtained by cutting out the infinite periodic sequence (... AAAA%) of the periodic sequence A.
- a transmission signal using the finite-length periodic sequence A 'as transmission data can be extracted by a matching filter (matched filter) corresponding to each coefficient of the spread sequence used to form the transmission signal.
- the matched filter is a filter that takes out the transmission data A by despreading, and is formed corresponding to the coefficient of the spread sequence used to form the transmission data A.
- the relationship between the input signal and the matched filter is determined based on the perfect complementarity of the spreading sequence. For example, when the signal M is passed through a matched filter of the signal M, an impulse-like signal can be obtained from the autocorrelation characteristic. However, the signal M is a matched filter other than the matched filter of the signal M. , No signal can be obtained from the cross-correlation characteristics.
- a f be the matched filter for signal A
- the output of the matched filter A f can be represented by the following convolution operation.
- the periodic sequence A ' is ( ⁇ ', 1), and the signal length is increased by 1 bit to 25 bits.
- At least one of the transmission signals to be formed is a pilot signal, and
- the pilot signal can be applied to detection of a multipath characteristic of a multipath transmission path through which a signal is transmitted, and detection of a transmission signal from which the multipath characteristic has been removed.
- FIG. 3 is a diagram for explaining the relationship between the pilot signal and the transmission signal.
- FIG. 4 is a diagram illustrating a relationship between a transmission signal and a detection signal, and a correlation.
- the signal A is a pilot signal, passes through the multipath transmission path P, and obtains the output signal p through the matched filter Af of the signal A, the output signal p
- the multipath characteristics P of the multipath transmission path can be obtained.
- signals B to D are transmitted signals and simultaneously pass through the same multipath transmission path P as the pilot signal, the same multipath characteristics are affected by the multipath transmission path P. Become. Therefore, the same multipath characteristics are included in the output signals q, r, and s obtained through the respective matched filters Bf, Cf, and Df. Therefore, by removing the multipath characteristic ⁇ ⁇ from the output signals q, r, and s using the multipath characteristic P obtained from the pilot signal, the transmission signal ,, the transmission signal C, and the The transmission signal D can be obtained.
- pk is a multipath factor in each delay time of time slots 0, 1, 2, and 3.
- the multipath characteristic P can be obtained, for example, by detecting a pilot signal that has passed through a multipath transmission line with a matched filter of the pilot signal.
- the signal A described above can correspond to a non-reflective direct path in the multipath transmission path, and the multipath factor pk corresponds to 1. ing.
- the received signal A ⁇ that has passed through the multipath transmission path having the multipath characteristic P (p0, pi, 2, p3) is obtained by adding each Manoreti path factor pk to the transmission signal (A ′, 1). Multiplied by
- a ⁇ p 0 (A ', 1, 0, 0, 0) + p1 (0, A', 1, 0, 0)
- a f 16 (x, x, x,..., X, x, x, p3, p0, pi , 2, p 3 p 0, 1, x, x, x, x, ⁇ ⁇ ⁇ , x, x)
- the same transmission signal (1, 0, 0, 0) is applied to each of the periodic sequences A to D, and the transmission data formed by applying the periodic sequence A is used as a pilot signal.
- the transmission signal for the transmission pilot signal (for example, (1, 1, 1, -1) which is different from the transmission signal (1, 0, 0, 0)) is used.
- Transmission data formed by applying the periodic sequence A to the transmission signal may be used as the pilot signal.
- the pilot signal and the pilot signal are passed through a filter corresponding to the pilot signal. Can be taken out.
- the data sequence (1 j, 0, 0, 0) and the data sequence (1, 0, 0, 0) after the periodic sequence B are added to the front position and the rear position of the periodic sequence B.
- a data string of a finite-length periodic sequence B ′ is formed.
- the data length of this periodic sequence B ′ is 24 bits, which is the data length of the periodic sequence B plus 16 bits plus 4 bits each.
- This periodic sequence B ′ can be obtained by cutting out the infinite periodic sequence (... BBBB%) of the periodic sequence B.
- the transmission signal using the finite-length periodic sequence B 'as transmission data can be extracted by a matching filter (matched filter) corresponding to each coefficient of the spread sequence used to form the transmission signal.
- the matched filter is a filter that takes out transmission data B by despreading, and is formed corresponding to the coefficient of the spread sequence used to form transmission data B.
- the signal ( ⁇ ', 1) and the signal ( ⁇ ', j) can be transmitted independently of each other if the time difference between the two signals is limited in the same frequency band. ( Figure 4 (c) and Figure 4 (d)).
- the pilot signals for detecting the multipath characteristics are not limited to signal A, but may be signals B, C, and D. The fact that the cross-correlation is uncorrelated can be confirmed from the following.
- the output signal is a
- a "* B f (X, X,..., X, X, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- the output signal is obtained by the computation of the transmission signal (B ′, j) and the matched filter B f.
- the received signal detected by the matched filter of signal B is calculated by the convolution operation of signal B ⁇ and matched filter B.
- the multipath characteristics p 0, p i, p 2, and p 3 can be obtained directly as the output of the matching finoletor (Fig. 4 (h)).
- the signals A, B, C, and D are uncorrelated with each other, the periodic cross-correlation function between the signals is 0 at every shift, and the periodic spectrum of each signal does not overlap. .
- a spread sequence signal ( ⁇ ', j, 0,0,0,0,0) obtained by shifting the transmission data b (b0, b1, b2, b3, b4, b5) in units of one chip. 0), ( ⁇ , ⁇ ', j, 0 qq ⁇ ⁇ ⁇ ⁇ ⁇ q ⁇ , o 234561 0, 0, 0), (0, 0, B', j, 0, 0, 0), ⁇ 0, 0, 0, 0, 0, B ', j) to form the transmission signal,
- This relational expression is seven simultaneous equations including six unknowns (b0, b1, b2, b3, b4, b5), p0-p3 and q0-q6
- the transmission data (b0, b1, b2, b3, b4, b5) can be obtained by using this. Note that p0 to p3 can be obtained from the output of the matched filter Af of the signal A, and q0 to q6 can be obtained from the output of the matched filter Bf of the signal B.
- the entire signal including data has the role of a spread sequence, and thereby, The spread of the amplitude can be reduced, and the dynamic range of the amplifier on the receiving side can be reduced.
- the transmission signal forming method, the communication method, and the data structure of the transmission signal of the present invention are useful and suitable for a multipath environment such as mobile communication.
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Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004532771A JP3777466B2 (ja) | 2002-08-30 | 2003-08-29 | 送信方法、通信方法、及び送信信号のデータ構造 |
EP03791409A EP1542372A4 (en) | 2002-08-30 | 2003-08-29 | METHOD FOR FORMING TRANSMISSION SIGNAL, COMMUNICATION METHOD, AND TRANSMISSION SIGNAL DATA STRUCTURE |
US10/525,737 US20050243944A1 (en) | 2002-08-30 | 2003-08-29 | Transmission signal formation method, communication method, and transmission signal data structure |
AU2003261817A AU2003261817A1 (en) | 2002-08-30 | 2003-08-29 | Transmission signal formation method, communication method, and transmission signal data structure |
Applications Claiming Priority (2)
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JP2002-255406 | 2002-08-30 | ||
JP2002255406 | 2002-08-30 |
Publications (1)
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WO2004021598A1 true WO2004021598A1 (ja) | 2004-03-11 |
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PCT/JP2003/011018 WO2004021598A1 (ja) | 2002-08-30 | 2003-08-29 | 送信信号形成方法、通信方法、及び送信信号のデータ構造 |
Country Status (7)
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US (1) | US20050243944A1 (ja) |
EP (1) | EP1542372A4 (ja) |
JP (1) | JP3777466B2 (ja) |
KR (1) | KR100699668B1 (ja) |
CN (1) | CN1679252A (ja) |
AU (1) | AU2003261817A1 (ja) |
WO (1) | WO2004021598A1 (ja) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005088856A1 (ja) * | 2004-03-12 | 2005-09-22 | University Of Tsukuba | 符号分割多重信号の相関分離識別方式 |
WO2006059619A1 (ja) * | 2004-11-30 | 2006-06-08 | Naoki Suehiro | 無線通信システム、無線通信方法及び通信装置 |
WO2006082865A1 (ja) * | 2005-02-02 | 2006-08-10 | Naoki Suehiro | 送受信方法、周期相互相関のない信号系列の生成方法及び通信機 |
WO2007139119A1 (ja) * | 2006-06-01 | 2007-12-06 | Naoki Suehiro | マルチパス特性推定方法及び装置、受信方法並びに受信信号補正方法及び装置 |
JP2008503186A (ja) * | 2004-06-10 | 2008-01-31 | シートグルー、ハサン | 信号処理のための行列値方法及び装置 |
WO2008032803A1 (fr) * | 2006-09-15 | 2008-03-20 | Naoki Suehiro | Procédé d'émission de données, émetteur de données, récepteur de données, procédé de création d'un jeu de mots de code et procédé de communication mobile |
WO2008126516A1 (ja) * | 2007-04-10 | 2008-10-23 | Naoki Suehiro | 送信方法、送信装置、受信方法及び受信装置 |
JP2009060409A (ja) * | 2007-08-31 | 2009-03-19 | Naoki Suehiro | データ伝送方法、データ受信方法及びデータ受信装置 |
JP2009060410A (ja) * | 2007-08-31 | 2009-03-19 | Naoki Suehiro | データ送信方法、データ送信装置及びデータ受信装置 |
Families Citing this family (2)
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GB2433397B (en) * | 2005-12-16 | 2008-09-10 | Toshiba Res Europ Ltd | A configurable block cdma scheme |
CN101326739B (zh) * | 2006-01-18 | 2011-08-03 | 华为技术有限公司 | 通信系统中的同步方法和系统 |
-
2003
- 2003-08-29 EP EP03791409A patent/EP1542372A4/en not_active Withdrawn
- 2003-08-29 KR KR20057003498A patent/KR100699668B1/ko not_active IP Right Cessation
- 2003-08-29 AU AU2003261817A patent/AU2003261817A1/en not_active Abandoned
- 2003-08-29 WO PCT/JP2003/011018 patent/WO2004021598A1/ja active Application Filing
- 2003-08-29 JP JP2004532771A patent/JP3777466B2/ja not_active Expired - Lifetime
- 2003-08-29 CN CNA038202328A patent/CN1679252A/zh active Pending
- 2003-08-29 US US10/525,737 patent/US20050243944A1/en not_active Abandoned
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JP2005260900A (ja) * | 2004-03-12 | 2005-09-22 | Tama Tlo Kk | 符号分割多重信号の相関分離識別方式 |
WO2005088856A1 (ja) * | 2004-03-12 | 2005-09-22 | University Of Tsukuba | 符号分割多重信号の相関分離識別方式 |
JP2008503186A (ja) * | 2004-06-10 | 2008-01-31 | シートグルー、ハサン | 信号処理のための行列値方法及び装置 |
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JP2016040947A (ja) * | 2007-04-10 | 2016-03-24 | シグナルデザイン株式会社 | 信号作成装置及び信号検出装置 |
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US20050243944A1 (en) | 2005-11-03 |
JPWO2004021598A1 (ja) | 2005-12-22 |
KR20050057052A (ko) | 2005-06-16 |
EP1542372A1 (en) | 2005-06-15 |
KR100699668B1 (ko) | 2007-03-23 |
AU2003261817A1 (en) | 2004-03-19 |
JP3777466B2 (ja) | 2006-05-24 |
CN1679252A (zh) | 2005-10-05 |
EP1542372A4 (en) | 2010-06-16 |
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