EP2248269A1 - Verfahren und vorrichtung zur reduzierung eines störsignalanteils sowie kommunikationssystem - Google Patents
Verfahren und vorrichtung zur reduzierung eines störsignalanteils sowie kommunikationssystemInfo
- Publication number
- EP2248269A1 EP2248269A1 EP08717129A EP08717129A EP2248269A1 EP 2248269 A1 EP2248269 A1 EP 2248269A1 EP 08717129 A EP08717129 A EP 08717129A EP 08717129 A EP08717129 A EP 08717129A EP 2248269 A1 EP2248269 A1 EP 2248269A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- component
- dimensional
- dimensional signal
- noise
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- 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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
- H04B1/126—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means having multiple inputs, e.g. auxiliary antenna for receiving interfering signal
-
- 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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
Definitions
- the invention relates to a method and apparatus for reducing a Störsignalanteils and a communication system comprising the device.
- a useful signal may be distorted or superimposed by it before its estimation or reconstruction or before measurement by a disturbance.
- Disturbances often occur as white noise (or Gaussian noise), in which a spectral
- Noise power density in a certain more or less large frequency band is practically constant. Particularly problematic are disturbances that are different from such white noise.
- the object of the invention is to avoid the above-mentioned disadvantages and in particular to reduce the effect of the disturbance independently of the presence of the useful signal.
- Expression or intensity can act. In particular, this can be more or less greatly reduced in the context of the reduction of the interference signal component. By way of example, it is also possible to (almost) completely reduce the interference signal component.
- the approach presented here makes it possible to reduce the interference signal component in an output signal by strongly or completely suppressing an input signal detected as severely disturbed and thus not processing it further.
- this method is suitable for detecting useful signals, wherein the useful signals are preferably transmitted redundantly at different locations of the multi-dimensional signal. Signals at strongly disturbed places can be faded out while eg signals at hardly (or not) disturbed places are allowed to pass through for further processing.
- Another advantage of the presented approach is that it does not need to know where which useful signals are present in the multi-dimensional signal. Rather, the reduction of the Störsignalanteils advantageously without closer knowledge of the nature or the location of the useful signals. In other words, the reduction of the Störsignalanteils takes place regardless of whether just Nutzsignale are transmitted or not.
- a development is that the transformation comprises a serial-parallel conversion of the input signal.
- a serial signal can be transformed into a multi-dimensional signal.
- a time-frequency transformation or a wavelet transformation can be used.
- these and other transformations can be used to obtain the multidimensional signal, in particular an n-dimensional signal.
- the input signal comprises a multi-dimensional signal and / or a complex signal.
- the transformation comprises a transformation into a time-frequency domain.
- the multi-dimensional signal is stored in a memory.
- the memory may be embodied as a plurality of parallel shift registers coupled line by line.
- the memory may be implemented as a conventional memory.
- the memory allows further processing units to access a multi-dimensional time-limited portion of the multi-dimensional signal.
- the memory comprises a field of coupled shift registers, which is synchronized with the transformation of the input signal.
- the estimation of the interference component of the multidimensional signal is carried out by providing at least one value of a predetermined function and / or a statistic and / or a statistical variable and / or a quantity or function derived therefrom for the at least one subset of the multidimensional Input signal is determined.
- the statistic may include an n-dimensional cumulative distribution function or an n-dimensional probability (density) function.
- the statistical quantity includes, for example, an average, a variance, an amount, or a statistical moment.
- the derived variable includes, for example, a curvature (excess), a skewness, a median value and / or a characteristic function. Also combinations among the above are possible.
- the estimate for at least one feature and / or for at least one parameter of the Störsignalanteils and / or the Nutzsignalanteils be determined.
- Examples of such features or parameters are: signal amplitude, signal power, signal magnitude, signal level, phase, frequency, and combinations thereof.
- the subset may include one or more patterns or sections of the multi-dimensional signal.
- these sections may be provided at different locations of the multi-dimensional signal.
- the subset itself can have different form (s). It is also possible that the subset has a shape that covers a multi-dimensional area and thereby has a multi-dimensional recess within this area. In the example of a two-dimensional time-frequency surface, this corresponds to a mold having a hole or opening within the mold.
- the at least one subset has a periodicity.
- multiple subsets or patterns may be considered at particular times, with the subsets having a particular time interval from one another.
- a next development is that the comparison of the noise component with the multi-dimensional signal is performed by using the noise component at least one signal barrier is set.
- the comparison allows the setting of at least one signal barrier based on the estimated noise component.
- a threshold for a useful signal can be dynamically adjusted, ie a signal above the threshold can be further processed, a signal below the threshold is suppressed and not further processed.
- An embodiment is that the multi-dimensional signal is at least partially suppressed, provided that this has no predetermined distance to the interference component.
- the type of suppression of the multi-dimensional signal may advantageously depend on the signal strength and does not have to be designed as a hard decision.
- An alternative embodiment is that an estimation of a useful signal strength of the multi-dimensional signal is performed, in particular by at least one value of a predetermined function and / or a statistic and / or a statistical variable and / or a quantity or function derived therefrom for the at least one subset is determined.
- An embodiment is that the estimate for at least one feature and / or for at least one
- Parameter of the useful signal component is determined or carried out.
- a next embodiment is that the comparison of the interference component with the multi-dimensional signal is carried out taking into account the useful signal level. It is also an embodiment that a useful signal is detected in the multi-dimensional signal, provided that this has a predetermined distance to the interference component.
- Both the estimation of the interference component and the estimation of the useful signal component can be multidimensional and / or complex like the receiver signal itself.
- the method for reducing the noise signal component can be used to detect a useful signal.
- a development consists in that at least one further channel is taken into account in the reduction of the interference signal component.
- the approach may be implemented as a multiple-input-multiple-output (MIMO) system, where each channel may have an impact on the other channels of the system and account for all or part of these effects.
- MIMO multiple-input-multiple-output
- step (d) in a step (e) an inverse transformation to step (a) is performed.
- Another embodiment is that a parallel-serial conversion of the output signal is performed in an output signal sequence.
- the output signal in a serial form in the original time domain and the estimated noise signal in serial form in a time course can be provided.
- the method is used in an at least partially disturbed channel.
- a communication channel which in particular comprises a power network as a connection medium.
- a device for reducing a noise signal component comprising a processor unit and / or an at least partially hardwired circuit arrangement, which is set up in such a way that the method can be carried out as described herein.
- Said processor unit can be or comprise any type of processor or computer or computer with correspondingly necessary peripherals (memory, input / output interfaces, input / output devices, etc.). Such a processor unit can in particular in one
- Communication device may be provided, which in particular has a receiver (receiver) or a transceiver.
- a hardwired circuit unit e.g. an FPGA or ASIC or other integrated circuit may be provided.
- electronic, electromagnetic, acoustic or other elements may be provided to detect and / or process different signals.
- the device may thus comprise a unit for parallel processing of signals and / or a unit for serial processing of signals.
- the device may comprise or be embodied as: a measuring device, a diagnostic device, a counter, an information acquisition device, a control device, a direction finder and / or a corresponding system.
- the device can be used in power engineering. It is possible that the signal comprises different physical quantities:
- the device is a communication device, wherein the communication device exchanges signals with another communication device via a communication link which at least partially comprises a power network.
- a system comprising a device as described herein.
- Fig.l a block diagram comprising units for
- Subareas of a two-dimensional signal are used to determine a noise component.
- the following notation is used in particular:
- s (t) is a useful signal
- r ⁇ (t, f) is a multidimensional (input) signal of a first channel
- ⁇ 1 (I, /) a multi-dimensional (input) signal of a first channel after interference suppression or passing through a signal barrier;
- Payload component based on [n (£, /)] s tJ ;
- a (t) a measure that indicates the extent to which the
- Payload s (t) in the input signal r (t) is included.
- ⁇ (t) an estimate of the strength of the useful signal s (t).
- interference signal component and the strength of the useful signal component can be at least partially dependent on one another.
- an input signal r ⁇ (t) of a serial-parallel conversion 101 is supplied and then subjected to a time-frequency transformation 102.
- a time-frequency transformation 102 can take place.
- the result of the time-frequency transformation 102 is a multi-dimensional signal ri (£, /), which is stored in a memory 103.
- the memory 103 is implemented as a field (or array) of line-by-line parallel shift registers.
- a column of the coupled parallel shift registers comprises elements of a current spectrum after a time-frequency transformation, a line comprises a time course in a spectral channel.
- a memory size allows storage of a time period T c .
- the current calculation can advantageously take place at a time t 0 ⁇ t ⁇ T C , so that for the calculation a context before the current time t, ie from a time to to the time t and a context from the time t to the time T c are available.
- the subsequent units can access all entries of the shift registers at a time t ⁇ .
- the memory 103 performs the function of a multi-channel delay or a sliding window for a plurality of parallel data series, which can be analyzed and / or further processed by the subsequent units accordingly.
- Parallel shift register can also be provided a conventional memory.
- the function of the sliding window can be implemented by special address pointers, or a corresponding incrementation of the same.
- the input signal is first subjected to a decomposition by means of a short-time Fourier transformation or a wavelet transformation or another transformation. Then, from the time-frequency distribution of the multi-dimensional signal n (t, f), it is preferable to continuously (eg at given discrete times) estimate an interference signal component determined and in particular for each of those components
- J 1 Un ( ⁇ Z) Lv 1 depending on the type or multi-dimensional pattern (for example, according to a given time-frequency pattern) of the suspected or assumed disturbance of the subset
- this subset may correspond to any pattern of or selection from the multi-dimensional signal n (t, f). If, for example, the multidimensional signal r ⁇ (t, f) is a two-dimensional time-frequency consideration, this subset may comprise at least one section in this plane, in particular several sections, possibly also periodically recurring sections.
- the function F (Ir 1 (LZ) Lv 1 J and the function F (Ir 1 (L f)] S ⁇ J can each comprise a determination of an energy density, a power or a mean signal amplitude.
- the subset [T 1 (LZ) Lv 1 j can also represent an environment of the signal to be recognized, without the signal to be recognized itself having to be contained therein.
- the useful signal component provides
- a disturbance in the time-frequency domain has a pattern recurring with a period Ty or if this disturbance is stationary with the same period Ty, then the estimation of the disturbance signal component fi ⁇ (t n f j ) can be based on subsets [n . (f.f)] ⁇ t ⁇ are formed by individual components of the time-frequency distribution of the multi-dimensional signal r i ( ⁇ .f), these subsets [n. (f.f)] ⁇ t ⁇ of each other by the period T k are removed.
- FIG. 2 shows by way of example such subsets 201, 202, 203 (also called “regions” or “patterns”) used to determine or estimate the noise component f? (T t , / j ).
- the respective subset can have the most varied forms.
- FIG. 2 shows an elliptical shape for each subset.
- the input signal r (ij, / j ) shown is, for example, within the subset 202, but not within the subsets
- those signal components r- ⁇ (f 4 , / _,) which appear to be of interest for further processing or recognition are subjected to a comparison in a unit 105.
- the signal components r ⁇ t ⁇ f j ) signal barriers are supplied, wherein signal passing properties of the signal barriers based on the estimated signal ( ⁇ , / j ) or optionally on the basis of the estimated useful signal strength Ai (t t , f j ) controlled and / or adjusted.
- the signal components r ⁇ t ⁇ f j ) are greater than (or equal to) a threshold consisting of the estimated noise components results, the signal components ri (t t , f j ) are passed through for further processing as an output signal r [(t t , f j ).
- the signal components r ⁇ t ⁇ f j in relation to the threshold value, the sooner or the stronger these are suppressed.
- the signal components ri (t t , f j ) should as far as possible be further processed as output signal r [(t t , f j ).
- the output signal r [(t t , f j ) can additionally be determined based on the estimated useful signal strength A i (t t , f j ). This can be achieved, for example, in that a difference between the estimated amplitude or the strength of the useful signal ⁇ (t t , f j ) and the estimated interference signal is determined and supplied to a threshold comparison: the greater the difference, the less the received signal ri (t t , f j ) is suppressed.
- each output signal r [(ti, f j) remains n ⁇ (t n f j) and / or the estimated strength of the desired signal ⁇ (t, f j) associated with the corresponding estimated interference signal as an indicator of the quality of the useful signal.
- the output signal ⁇ 1 (I 1 , f j ) and the estimated interference signal ni (ti, fj) can either be further processed directly or respectively transformed back into the time domain (eg by means of an inverse short-time Fourier transformation or an inverse wavelet transformation ), see units 107 and 108 in Fig.l.
- the units 107 and 108 can each be followed by a parallel-serial conversion unit 109 or 110, at the outputs of which an output signal sequence r [(t) or an estimated interference signal sequence n ⁇ (t) is provided.
- the estimated useful signal or its strength or level Ai (ti, fj ) via a unit 112 for inverse time-frequency transformation into a signal and further converted by a unit 113 for parallel-serial conversion into a serial signal ⁇ (t).
- FIG. 1 shows a block 111 which illustrates that the arrangement described above can optionally be provided for at least one further channel K with an input signal r / v - (i).
- the operation of the optional block 111 is analogous to the above statements regarding the first channel with the input signal r ⁇ (t).
- components [r ⁇ (t, f)] s t 3 of the further channel K in the useful signal strength estimate ⁇ i (t t , f j ) 106 can also be taken into account.
- an output signal r ⁇ '(t ⁇ , f J ) and an estimated noise signal n ⁇ (t t , f j ) and an estimated useful signal strength ⁇ (t ⁇ ⁇ f j ) of the channel K influenced by the signals [r ⁇ ⁇ Uf)] S ⁇ J , and [ri (f. /)] jViJ are taken into account in the corresponding units of the channel K (this case is not shown in Fig.l for the sake of clarity).
- each channel comprising the units for NutzsignalGoods proof.
- the approach presented here makes it possible to suppress a single interference signal or a group of interference signals.
- disturbances in the input signal can generally be suppressed. Only the useful signal components, which are distinguished in the time-frequency distribution of the input signal from the currently estimated interference signal components, are not suppressed or further processed and / or evaluated. Thus, the interference suppression remains effective even if the useful signal is not contained in the input signal or the interference situation or the type of interference has changed.
- This approach can be used in particular independently of any further processing or independently of the type of further processing of the signals, in particular because the time-frequency distribution of the interference-suppressed signal can be transformed back into the time domain as required.
- the approach presented may be used to exchange information with communication devices over a network (or over a network network).
- communication devices may be electrical monitoring devices incorporating e.g. a central information concerning status and / or counter status information receives.
- a communication medium can serve as an example of the power grid, the interference for data transmission over said power network can be effectively suppressed with the approach proposed here.
- the data advantageously be configured redundantly.
- a severely disturbed channel and a selective suppression of a disturbance can be ensured that the required information arrives at the receiver.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/052296 WO2009106130A1 (de) | 2008-02-26 | 2008-02-26 | Verfahren und vorrichtung zur reduzierung eines störsignalanteils sowie kommunikationssystem |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2248269A1 true EP2248269A1 (de) | 2010-11-10 |
Family
ID=40090747
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08717129A Ceased EP2248269A1 (de) | 2008-02-26 | 2008-02-26 | Verfahren und vorrichtung zur reduzierung eines störsignalanteils sowie kommunikationssystem |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2248269A1 (de) |
WO (1) | WO2009106130A1 (de) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5493581A (en) * | 1992-08-14 | 1996-02-20 | Harris Corporation | Digital down converter and method |
US6516183B1 (en) * | 1999-09-10 | 2003-02-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for disturbance compensation of a direct conversion receiver in a full duplex transceiver |
DE10103479A1 (de) * | 2001-01-26 | 2002-08-08 | Infineon Technologies Ag | Signalempfangs- und -verarbeitungsverfahren für schnurlose Kommunikationssysteme |
GB0122196D0 (en) * | 2001-09-14 | 2001-10-31 | Roke Manor Research | Improvements to the n-plex transceiver |
-
2008
- 2008-02-26 EP EP08717129A patent/EP2248269A1/de not_active Ceased
- 2008-02-26 WO PCT/EP2008/052296 patent/WO2009106130A1/de active Application Filing
Non-Patent Citations (2)
Title |
---|
JÜRGEN NIEDERHOLZ: "Anwendungen der Wavelet-Transformation in Übertragungssystemen", 20 July 1999 (1999-07-20), pages 95 - 158, XP055200898, Retrieved from the Internet <URL:http://duepublico.uni-duisburg-essen.de/servlets/DerivateServlet/Derivate-5014/kapitel5.pdf> [retrieved on 20150708] * |
See also references of WO2009106130A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009106130A1 (de) | 2009-09-03 |
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