WO2005041513A1 - シンボル点推定装置、方法、プログラムおよび記録媒体 - Google Patents
シンボル点推定装置、方法、プログラムおよび記録媒体 Download PDFInfo
- Publication number
- WO2005041513A1 WO2005041513A1 PCT/JP2004/016281 JP2004016281W WO2005041513A1 WO 2005041513 A1 WO2005041513 A1 WO 2005041513A1 JP 2004016281 W JP2004016281 W JP 2004016281W WO 2005041513 A1 WO2005041513 A1 WO 2005041513A1
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- WIPO (PCT)
- Prior art keywords
- output
- frequency component
- received signal
- symbol point
- time delay
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Classifications
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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
Definitions
- the present invention relates to estimating a symbol point of a signal.
- the measurement of the symbol points of the received signal includes (1) AZD conversion of the received signal, (2) passing through the filter to remove noise, (3) extracting the symbol rate component, (4) calculating the phase, (5) ) It is necessary to perform a process such as conversion of a phase into a time delay amount (for example, refer to Patent Literature 1 (Japanese Patent Publication No. 2003-15028)).
- Patent Literature 1 Japanese Patent Publication No. 2003-15028
- the symbol point of the received signal is determined by determining the time delay value between the sampling point of the received signal sampled at the sampling frequency and the symbol point of the received signal.
- a symbol point estimating apparatus for estimating wherein a multiplication product sum output means for outputting a product sum of a complex conjugate of a frequency component of an ideal signal and a frequency component of a received signal and a sampling angular frequency; It is configured to include a time delay value determining means for determining a time delay value based on the output of the sum output means so that an error component between the ideal signal and the received signal is minimized.
- the symbol delay of the received signal is determined by determining the time delay value between the sampling point of the received signal sampled at the sampling frequency and the symbol point of the received signal.
- a symbol point estimating apparatus for estimating points is provided.
- the product-sum product output means outputs the product sum of the result of multiplication of the complex conjugate of the frequency component of the ideal signal and the frequency component of the received signal, and the sampling angular frequency.
- the time delay value determining means determines the time delay value based on the output of the multiply-accumulate-sum output means such that an error component between the ideal signal and the received signal is minimized.
- the multiplication product sum output means includes: The product sum output which outputs the product sum of the output of the calculating means and the sampling angular frequency And force means.
- the frequency component multiplication output means includes: an ideal signal frequency component output means that outputs a frequency component of an ideal signal; and a reception signal frequency that outputs a frequency component of a reception signal.
- the frequency component multiplier / output unit includes a convolution integral output unit that outputs a convolution integral of a complex conjugate of an ideal signal and a received signal; Frequency component output means for outputting the above frequency component.
- the product sum output means includes: real part product sum means for outputting a product sum of a real part of the output of the frequency component multiplication output means and the sampling angular frequency;
- the imaginary part sum-of-products means for outputting the product sum of the imaginary part of the output of the frequency component multiplication output means and the sampling angular frequency;
- the output of the real part sum-of-products means the real part;
- a complex number output unit that outputs a complex number as a unit can be configured to be comfortable.
- the time delay value determining means includes: a declination of an output of the multiply-accumulation-sum output means; a sampling angular frequency; and a reception used to calculate an error component.
- the time delay value can be determined based on a certain error calculation length.
- the time delay value determining means receives the output of the multiply-accumulate-sum output means, and outputs the argument, and the output of the argument output means, And a time delay value calculating means for calculating a time delay value based on the sampling angular frequency and the error calculation length.
- a time delay value between a sampling point of a received signal sampled at a sampling frequency and a symbol point of the received signal is determined!
- This is a symbol point estimation method that estimates the symbol point of the received signal by multiplying the complex conjugate of the ideal signal frequency component by the frequency component of the received signal and the product sum of the sampling angular frequency.
- a time delay value determining step for determining a time delay value based on the output of the multiply-accumulate output step so that an error component between the ideal signal and the received signal is minimized.
- a symbol point of a received signal is estimated by determining a time delay value between a sampling point of the received signal sampled at a sampling frequency and a symbol point of the received signal.
- This is a program that causes a computer to execute symbol point estimation processing to output the product sum of the result of multiplying the complex conjugate of the ideal signal frequency component by the frequency component of the received signal and the sampling angular frequency.
- the time delay value is set so that the error component between the ideal signal and the received signal is minimized.
- This is a program for executing a time delay value determination process to be determined all at once on a convenience store.
- a symbol of a received signal is determined by determining a time delay value between a sampling point of the received signal sampled at a sampling frequency and a symbol point of the received signal.
- a computer-readable recording medium that stores a program for causing a computer to execute symbol point estimation processing for estimating points. The result of multiplying the complex conjugate of the frequency component of the ideal signal by the frequency component of the received signal. Multiply-accumulate output process that outputs the sum of products with the sampling angular frequency. Time to determine value Can be read by a computer that stores a program that causes the computer to execute the delay value determination process Recording medium.
- FIG. 1 is a block diagram showing a configuration of a symbol point estimating apparatus 1 according to an embodiment of the present invention.
- FIG. 2 is a diagram showing an error component EVM between the ideal signal r (k) and the received signal z (k).
- FIG. 3 is a diagram showing a configuration of the frequency component multiplication output unit 12.
- FIG. 4 is a diagram showing a modified example of the configuration of the frequency component multiplication output unit 12.
- FIG. 5 is a diagram showing a configuration of the product-sum output unit 14.
- FIG. 6 is a diagram showing a configuration of the time delay value determination unit 20.
- FIG. 1 is a block diagram showing a configuration of a symbol point estimation device 1 according to the embodiment of the present invention.
- the symbol point estimating apparatus 1 is for estimating a symbol point of a received signal z (k). By estimating symbol points, demodulation of received signal z (k) or modulation analysis of received signal z (k) can be performed. The estimation of the symbol point of the received signal z (k) is based on the time delay value between the sampling point of the received signal z (k) sampled at the sampling frequency fs and the symbol point of the received signal z (k). It can be done by deciding.
- the symbol point estimating apparatus 1 includes a multiply-product-sum output unit 10 and a time delay value determination unit 20.
- the multiply-accumulate output unit 10 outputs a result Y () of multiplying the complex conjugate R (n) * of the frequency component R (n) of the ideal signal r (k) by the frequency component Z (n) of the received signal z (k).
- n ) Z (n) R (n) * and sampling angular frequency A w
- N is the EVM calculation length as described later.
- the ideal signal r (k) is created from the received signal z (k).
- EVM error vector magnitude
- N is the EVM calculation length.
- the product-sum product output unit 10 has a frequency component product output unit 12 and a product-sum output unit 14.
- FIG. 3 shows the configuration of the frequency component multiplication output unit 12.
- the frequency component multiplication output section 12 is ⁇ section (ideal signal frequency component output section) 1 2 2, FT section (received signal frequency component output section) 124, complex conjugate output section 1 26, multiplier (frequency Component multiplication output means).
- FFT section (ideal signal frequency component output means) 1 2 2 performs FFT (fast Fourier transform) on ideal signal r (k) and outputs the result.
- the result of FFT of the ideal signal r (k) is the frequency component R (n) of the ideal signal r (k).
- FFT section (received signal frequency component output means) 124 performs FFT (fast Fourier transform) on received signal Z and outputs the result.
- the result of FFT of the received signal z (k) is the frequency component Z (n) of the received signal z (k).
- the complex conjugate output unit 126 outputs a complex conjugate H (n) * of the output R (n) of the FFT unit (ideal signal frequency component output means) 22.
- FIG. 4 A modification of the configuration of the frequency component multiplication output unit 12 is shown in Fig. 4.
- the frequency component multiplication output unit 12 has a complex conjugate output unit 121, a convolution integral output unit 123, and an FFT unit (frequency component output means) 125.
- the complex conjugate output unit 121 has an ideal signal r (k complex conjugate r (k) * c convolution output section 1 2 3 outputs a) is a complex conjugate output unit 1 2 1 output r (k) *, the convolution of the received signal z (k) output I do.
- the FFT unit (frequency component output means) 125 performs FFT (fast Fourier transform) on the output of the convolution integral output unit 123 and outputs the result.
- the product-sum output unit 14 outputs the output Y (n:
- FIG. 5 shows the configuration of the product-sum output unit 14.
- the product-sum output unit 14 has a real-part acquisition unit 141, a real-part product-sum unit 142, an imaginary-part acquisition unit 144, an imaginary-product-summation unit 144, and a complex-number output unit 144.
- the real part obtaining unit 141 obtains the real part ⁇ ( ⁇ ) of Y (n).
- the real part product-sum unit 144 outputs the product sum of ⁇ ( ⁇ ) and the sampling angular frequency ⁇ .
- the product sum of ⁇ ( ⁇ ) and ⁇ is defined as the following equation (2).
- the imaginary part acquisition unit 144 acquires the imaginary part Q (n) of ⁇ ( ⁇ ).
- the imaginary product-sum unit 144 outputs the product sum of Q (n) and the sampling angular frequency ⁇ .
- the product sum of Q (n) and ⁇ is defined as the following equation (3).
- the complex number output unit 144 outputs a complex number in which the output of the real part product-sum unit 144 is the real part, and the output of the imaginary part product-sum unit 144 is the imaginary part ′.
- the output of the complex number output section 1 4 6 is Aej fl .
- the complex number output section 144 has a multiplier 144a and an adder 144b.
- the adder 1 4 6 b The output of the multiplier 1 46 a is added to the output of the real product-sum unit 1 42.
- the output of adder 1 4 6 b ' is Ae ⁇ .
- the time delay value determiner 20 sets the error component (EVM) between the ideal signal r (k) and the received signal z (k) to be minimum based on the output Ae of the multiply-accumulator output unit 10. Determine the time delay value
- the EVM normalizes the error component £ defined by the following equation (4) and takes the root.
- the error component £ should be minimized.
- the following equation (5) holds. That is, a value 0 is obtained by partially differentiating the error component £ with a time delay value.
- the time delay value determination unit 20 determines the time delay value based on the argument 6> of the output Aejs of the product-sum product output unit 10, the sampling angular frequency ⁇ , and the EVM calculation length ⁇ . Can decide.
- FIG. 6 shows the configuration of the time delay value determination unit 20.
- the time delay value determination section 20 has a deflection output section 22 and a time delay value calculation section 24.
- the argument output unit 22 receives the output Ae ⁇ of the product-sum output unit 10 and outputs the argument 0.
- the time delay value calculator 24 calculates the time delay based on the output 0 of the argument output unit 22, the sampling angular frequency ⁇ , and the error calculation length ⁇ .
- Equation (5) an ideal signal r (k) is created from the received signal z (k). Then, the received signal z (k) and the ideal signal r (k) are given to the frequency component multiplier output unit 12 of the product-sum output unit 10.
- the time delay value determination unit 20 determines the time delay value based on the argument 0 of Ae, the sampling angular frequency ⁇ , and the EVM calculation length ⁇ . According to the determined time delay value, EVM can be minimized.
- the time delay value can be determined using the frequency components (Z (n), R (n)) of the received signal z (k) and the ideal signal r (k). The symbol point of the received signal z (k) can be estimated using the time delay value.
- the frequency component (Z (n), R (n)) is used, the received signal z () is compared to the conventional case where the time component (z (k), r (k)) is used.
- Equation (6) is derived from Equation (5)]
- the error component e is represented using the frequency component R (n) of the ideal signal and the frequency component Z (n) of the received signal.
- the discrete Fourier transform pairs of z and r are z (k) Z (n) and r (k) R (n).
- the following equation ( ⁇ ) is established from the Parseval equation.
- Equation (8) can be rewritten.
- Equation (1 1) has only the real part, and the imaginary part has no relation. Therefore, equation (11) holds even if the complex conjugate is taken for each term of equation (11). Therefore, for the first term on the right-hand side of equation (11), equation (11) is transformed by taking complex conjugate to obtain the following equation (12).
- Equation (20) is the same as equation (6). Therefore, equation (6) can be derived from equation (5).
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- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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DE112004002088T DE112004002088T5 (de) | 2003-10-29 | 2004-10-27 | Vorrichtung, Verfahren, Programm und Aufzeichnungsmedium zum Abschätzen vom Symbolpunkten |
US10/577,254 US20070165751A1 (en) | 2003-10-29 | 2004-10-27 | Symbol point estimating apparatus, method, program, and recording medium |
Applications Claiming Priority (2)
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JP2003368470A JP2005136555A (ja) | 2003-10-29 | 2003-10-29 | シンボル点推定装置、方法、プログラムおよび記録媒体 |
JP2003-368470 | 2003-10-29 |
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WO2005041513A1 true WO2005041513A1 (ja) | 2005-05-06 |
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PCT/JP2004/016281 WO2005041513A1 (ja) | 2003-10-29 | 2004-10-27 | シンボル点推定装置、方法、プログラムおよび記録媒体 |
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US (1) | US20070165751A1 (ja) |
JP (1) | JP2005136555A (ja) |
DE (1) | DE112004002088T5 (ja) |
WO (1) | WO2005041513A1 (ja) |
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CN102739328B (zh) * | 2012-06-18 | 2014-08-27 | 航天恒星科技有限公司 | 一种卫星移动通信终端矢量幅度误差测量装置及方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11261443A (ja) * | 1998-03-09 | 1999-09-24 | Alps Electric Co Ltd | 拡散変調信号受信装置 |
JP2002094584A (ja) * | 2000-09-18 | 2002-03-29 | Matsushita Electric Ind Co Ltd | 受信装置及びタイミング推定方法 |
Family Cites Families (7)
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JP3419567B2 (ja) * | 1994-11-08 | 2003-06-23 | アンリツ株式会社 | デジタル信号のシンボル識別点検出回路 |
JP3556047B2 (ja) * | 1996-05-22 | 2004-08-18 | 三菱電機株式会社 | ディジタル放送受信機 |
US5852630A (en) * | 1997-07-17 | 1998-12-22 | Globespan Semiconductor, Inc. | Method and apparatus for a RADSL transceiver warm start activation procedure with precoding |
KR100347965B1 (ko) * | 1998-04-14 | 2002-08-09 | 프라운호퍼-게젤샤프트 츄어 푀르더룽 데어 안게반텐 포르슝에.파우. | 멀티캐리어 시스템내 조주파수 동기화 |
US7027429B2 (en) * | 2001-06-19 | 2006-04-11 | Flarion Technologies, Inc. | Method and apparatus for time and frequency synchronization of OFDM communication systems |
WO2003094399A1 (fr) * | 2002-04-30 | 2003-11-13 | Advantest Corporation | Procede, programme, mesureur de position d'un dispositif et support sur lequel est enregistre le programme |
KR100528332B1 (ko) * | 2003-03-15 | 2006-01-09 | 삼성전자주식회사 | Ofdm 시스템에서의 초기 주파수 동기 방법 및 장치 |
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2003
- 2003-10-29 JP JP2003368470A patent/JP2005136555A/ja not_active Withdrawn
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2004
- 2004-10-27 WO PCT/JP2004/016281 patent/WO2005041513A1/ja active Application Filing
- 2004-10-27 DE DE112004002088T patent/DE112004002088T5/de not_active Withdrawn
- 2004-10-27 US US10/577,254 patent/US20070165751A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11261443A (ja) * | 1998-03-09 | 1999-09-24 | Alps Electric Co Ltd | 拡散変調信号受信装置 |
JP2002094584A (ja) * | 2000-09-18 | 2002-03-29 | Matsushita Electric Ind Co Ltd | 受信装置及びタイミング推定方法 |
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DE112004002088T5 (de) | 2006-09-21 |
US20070165751A1 (en) | 2007-07-19 |
JP2005136555A (ja) | 2005-05-26 |
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