WO2000065537A1 - Verfahren und vorrichtung zum ermitteln von interpolierten zwischenwerten eines abgetasteten signals - Google Patents
Verfahren und vorrichtung zum ermitteln von interpolierten zwischenwerten eines abgetasteten signals Download PDFInfo
- Publication number
- WO2000065537A1 WO2000065537A1 PCT/DE2000/001003 DE0001003W WO0065537A1 WO 2000065537 A1 WO2000065537 A1 WO 2000065537A1 DE 0001003 W DE0001003 W DE 0001003W WO 0065537 A1 WO0065537 A1 WO 0065537A1
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- WIPO (PCT)
- Prior art keywords
- output value
- bit
- adder
- value
- renaming
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 18
- 238000005070 sampling Methods 0.000 claims abstract description 22
- 238000007792 addition Methods 0.000 claims description 3
- 230000014509 gene expression Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
- G06T3/4007—Scaling of whole images or parts thereof, e.g. expanding or contracting based on interpolation, e.g. bilinear interpolation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/17—Function evaluation by approximation methods, e.g. inter- or extrapolation, smoothing, least mean square method
Definitions
- the present invention relates to a method and a device for determining interpolated intermediate values of a sampled signal, in particular a mobile radio signal, according to the preamble of claim 1 and the preamble of claim 11.
- interpolated intermediate values of a sampled signal is necessary wherever due to certain restrictions only a limited number of samples of the signal are available. For example, the calculation of interpolated values is required at various points in the field of computer graphics or in the field of digital mobile radio. In the field of mobile radio in particular, it is necessary to estimate intermediate values by interpolation, since only a small number of samples are available at certain points for evaluating a received signal.
- the slope of the curve which is defined by the first derivative at the corresponding point, can be included in the calculation.
- the slope m is generally for the second degree polynomial mentioned above
- the object of the present invention is therefore to develop a method and a device for determining interpo- To provide the measured intermediate values of a sampled signal, which enables a determination or calculation of intermediate values in a simple manner and with less hardware expenditure.
- the present invention relates to the determination or calculation of interpolated intermediate values of a signal in the presence of a special case, which occurs particularly frequently in the mobile radio sector, so that the solution according to the invention can be used almost without restricting generality.
- the signal is sampled at constant intervals.
- a simple, optimized hardware implementation of the interpolator is possible, where used several times in several circuit units and divisions are not carried out explicitly, but are realized by moving the data lines or by renaming the corresponding bits, so that no additional hardware is required for this. Multiplications are also not carried out as such, but are replaced by much simpler and cleverly chosen additions.
- the present invention can be used in particular for the analysis of a digital received signal in digital mobile radio systems, e.g. be used in UMTS terminals (Universal Mobile Telecommunication System).
- digital mobile radio systems e.g. be used in UMTS terminals (Universal Mobile Telecommunication System).
- UMTS terminals Universal Mobile Telecommunication System
- FIG. 3 shows a block diagram of an interpolator according to a first exemplary embodiment of the invention
- FIG. 4 shows the structure of a first calculation unit shown in FIG. 3,
- FIG. 5 shows the structure of a second calculation unit shown in FIG. 3,
- FIG. 6 shows a block diagram of an interpolator according to a second exemplary embodiment of the invention.
- the known pairs of measured values or samples thus obtained are represented by solid arrows.
- These known samples are now to be used to reconstruct only a few discrete intermediate values of the corresponding signal curve, which runs through the known samples, which are shown in FIG. 1 by dashed arrows. This is particularly necessary if the signal sampling is not possible with an arbitrarily precise speed or a finite measuring accuracy is required, which is the case with applications in digital mobile radio.
- the parameter c can thus be replaced by y 2 in the formulas for yi and y 3 , so that after subtracting the resulting formulas, the following expression results:
- the parameter b sought thus has the value by 3 -y ⁇
- An interpolator which carries out the calculations shown above thus receives the three known samples yi, y 2 and y 3 at its inputs and outputs six intermediate values as a function thereof, as is also shown in FIG. 1.
- the circuit structure of the interpolator can be optimized by providing units that are used several times. Furthermore, in the hardware implementations described below, multiplications are not carried out as such, but are replaced by cleverly chosen additions, which are much simpler.
- the divisions to be carried out can also be carried out by moving the corresponding data lines, ie by renaming or re-evaluating the corresponding bits of the value to be divided, be implemented so that in principle no additional hardware is required for the divisions.
- FIG. 1 shows a block diagram of a corresponding interpolator 24, to which a known unit 23, which is used to calculate the intermediate values, is used by a scanning unit 23.
- the interpolator 24 comprises two calculation units 1 and 2, five division or bit renaming units 3-7, eight adders 8-12 and 16-18 and three subtractors 13-15.
- the interconnection of the individual components can be seen in FIG. 3.
- the calculation unit 1 is used to calculate the expression y_ + y__ -y 2 , which is required to calculate each intermediate value above.
- the structure of the calculation unit 1 is shown by way of example in FIG. 4 and essentially comprises an adder 19 and a subtractor 21.
- the division by 2 is carried out by a bit renaming unit 20 which shifts the output lines of the adder 19 so that the output value of the adder 19 is halved by shifting the bits of the output value of the adder 19 by one position.
- the calculation unit 2 is used to calculate the expression - -, which is also required to calculate each intermediate value.
- the structure of the calculation unit 2 is shown in FIG. 5 and essentially comprises a subtractor 22, the output value of which is again halved by a bit renaming unit 23 in that the data output lines of the subtractor 22 are shifted.
- the circuit thus proposed is suitable for quick calculations, since all intermediate values are calculated in parallel.
- the present at the inputs known Abtastwer- te Vi, y 2 and y 3 are applied at twice the sampling frequency of the scanning unit 23 to the inputs of the interpolator.
- a further simplification in terms of hardware can be achieved if only the intermediate values for
- FIG. 6 Circuit example is shown in Fig. 6, wherein the elements corresponding to the elements shown in Fig. 5 are given the same reference numerals. In this case, however, the scanning unit applies new samples with the sampling frequency to the interpolator 24, so that a calculation must be carried out at each sampling time in order to calculate all the desired intermediate values.
- the circuit shown in FIG. 6 already manages with the four adders 11-12, 17 and 19 and the four subtractors 14, 15, 21 and 22.
- Both circuits shown calculate an interpolation, which increases the virtual sampling rate to four times the value.
- the circuit shown in FIG. 5 supplies six intermediate values in parallel, the inputs of the interpolator being reassigned in every second step, so that the elements provided in the circuit shown in FIG. 5 can work quite slowly.
- the circuit shown in FIG. 6 on the other hand, three intermediate values are calculated, but the inputs have to be reset with each sampling time.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Data Mining & Analysis (AREA)
- Algebra (AREA)
- Databases & Information Systems (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Complex Calculations (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000614208A JP2002543644A (ja) | 1999-04-22 | 2000-04-03 | サンプリング信号を補間する中間値を求める方法および装置 |
KR1020017013494A KR20020021787A (ko) | 1999-04-22 | 2000-04-03 | 표본 신호의 보간 중간값을 결정하기 위한 방법 및 장치 |
EP00930996A EP1183646A1 (de) | 1999-04-22 | 2000-04-03 | Verfahren und vorrichtung zum ermitteln von interpolierten zwischenwerten eines abgetasteten signals |
US10/036,246 US6526428B2 (en) | 1999-04-22 | 2001-10-22 | Method and apparatus for determining interpolated intermediate values of a sampled signal |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19918320.1 | 1999-04-22 | ||
DE19918320 | 1999-04-22 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/036,246 Continuation US6526428B2 (en) | 1999-04-22 | 2001-10-22 | Method and apparatus for determining interpolated intermediate values of a sampled signal |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000065537A1 true WO2000065537A1 (de) | 2000-11-02 |
Family
ID=7905522
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/001003 WO2000065537A1 (de) | 1999-04-22 | 2000-04-03 | Verfahren und vorrichtung zum ermitteln von interpolierten zwischenwerten eines abgetasteten signals |
Country Status (6)
Country | Link |
---|---|
US (1) | US6526428B2 (de) |
EP (1) | EP1183646A1 (de) |
JP (1) | JP2002543644A (de) |
KR (1) | KR20020021787A (de) |
CN (1) | CN1203450C (de) |
WO (1) | WO2000065537A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4205070B2 (ja) * | 2005-03-09 | 2009-01-07 | アンリツ株式会社 | 信号測定装置及び信号分析装置 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5502662A (en) * | 1993-12-23 | 1996-03-26 | Genesis Microchip Inc. | Method and apparatus for quadratic interpolation |
EP0853292A2 (de) * | 1997-01-10 | 1998-07-15 | Harris Corporation | Interpolator und Verfahren zur Interpolierung von digitalen Signalmustern |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1363073A (en) | 1970-07-17 | 1974-08-14 | Solartron Electronic Group | Generation of trigonometrical and other functions by interpolation between point values |
-
2000
- 2000-04-03 CN CNB008076162A patent/CN1203450C/zh not_active Expired - Fee Related
- 2000-04-03 KR KR1020017013494A patent/KR20020021787A/ko active IP Right Grant
- 2000-04-03 EP EP00930996A patent/EP1183646A1/de not_active Withdrawn
- 2000-04-03 WO PCT/DE2000/001003 patent/WO2000065537A1/de not_active Application Discontinuation
- 2000-04-03 JP JP2000614208A patent/JP2002543644A/ja active Pending
-
2001
- 2001-10-22 US US10/036,246 patent/US6526428B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5502662A (en) * | 1993-12-23 | 1996-03-26 | Genesis Microchip Inc. | Method and apparatus for quadratic interpolation |
EP0853292A2 (de) * | 1997-01-10 | 1998-07-15 | Harris Corporation | Interpolator und Verfahren zur Interpolierung von digitalen Signalmustern |
Also Published As
Publication number | Publication date |
---|---|
US20020152249A1 (en) | 2002-10-17 |
CN1203450C (zh) | 2005-05-25 |
CN1353847A (zh) | 2002-06-12 |
EP1183646A1 (de) | 2002-03-06 |
US6526428B2 (en) | 2003-02-25 |
JP2002543644A (ja) | 2002-12-17 |
KR20020021787A (ko) | 2002-03-22 |
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