EP2248268A2 - Verfahren zur detektion sowie zur generierung eines nutzsignals und zugehörige vorrichtungen sowie kommunikationssystem - Google Patents
Verfahren zur detektion sowie zur generierung eines nutzsignals und zugehörige vorrichtungen sowie kommunikationssystemInfo
- Publication number
- EP2248268A2 EP2248268A2 EP08878341A EP08878341A EP2248268A2 EP 2248268 A2 EP2248268 A2 EP 2248268A2 EP 08878341 A EP08878341 A EP 08878341A EP 08878341 A EP08878341 A EP 08878341A EP 2248268 A2 EP2248268 A2 EP 2248268A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- useful signal
- dimensional
- useful
- component
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
Definitions
- the invention relates to a method for detection and to a method for generating a useful signal and associated devices and to a communication system.
- a receiver for example a measuring device
- a receiver often does not have a priori information as to whether and to what extent a useful signal is contained in a received signal or in an input signal.
- the received signal may be distorted by a disturbance or generally altered
- Noise often occurs 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 which are different from such white noise and have strong time- and / or frequency-selective properties.
- a plurality of frequency channels may for a short time be disturbed in such a way that detection of a useful signal is no longer possible in a frequency channel.
- the object of the invention is to avoid the abovementioned disadvantages and in particular to present an approach by means of which, even in the case of strong temporal and / or frequency-selective interference, a robust detection of a synchronization signal or a useful signal with high reliability is made possible,
- the useful signal is a multi-dimensional useful signal
- the useful signal comprises several elements
- elements of the useful signal in several dimensions e.g. in a time-frequency domain, considered.
- the plurality of elements of the desired signal are functionally dependent on each other.
- the multiple elements of the useful signal are advantageously designed to be redundant, so that a part of the plurality of elements can be used for a reconstruction or detection of the useful signal.
- the plurality of elements of the payload signal are split among the multiple dimensions of the payload signal so that disturbance of the payload signal upon transmission from a transmitter to a receiver is tolerable.
- a development is that different elements of the useful signal are processed with different carrier signals and / or on different subchannels,
- the useful signal can be divided into different subchannels, which are modulated in particular with different carrier signals.
- Another development is that the functional dependency is determined using a predetermined n-dimensional matrix or can be determined.
- this n-dimensional matrix can be given to specify the functional dependencies.
- the n-dimensional array predetermines the functional dependencies such that, depending on the nature of the disturbance, it is possible to detect the useful signal.
- the functional dependency is determined on the basis of a frequency modulation, a differential modulation and / or a coding.
- the dependencies of the elements of the NutEsignals each other can be determined by a differential modulation.
- information about state changes is preferably transmitted, not by absolute reference values.
- differential modulations are: D-PSK (differential phase shift keying), delta modulation.
- the functional dependence is determined in a time range and / or in a frequency range.
- the elements of the useful signal can be distributed in the time domain and / or in the frequency domain may be arranged, wherein the functional dependencies may be in one or both of these areas.
- a further development is that the functional dependence of an element of the useful signal of at least one further element of the useful signal is taken into account by determining individual elements of a synchronization matrix based on a hard and / or soft decision.
- Dependence of an element of the useful signal is taken into account by at least one further element of the same subchannel and / or from at least one further subchannel of the multidimensional useful signal.
- An alternative embodiment is that for at least one element a corresponding Sound signal estimate or an estimate of the signal strength of the respective element is taken into account.
- Correlation in particular an autocorrelation of the signal with itself, with at least partially disjoint parts of the signal or a cross-correlation of the signal with another signal, is performed.
- the coefficients of the correlator can be adapted to the synchronization matrix.
- a filtering is carried out by means of a filter.
- the coefficients of the filter can be adapted to the synchronization matrix.
- Interference signal component can be any interference signal of any degree or intensity, in particular can be reduced more or less as part of the reduction of the Störsignalanteils this. By way of example, it is also possible to (almost) completely reduce the interference signal component.
- 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 straight payload signals 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 access to a multi-dimensional temporally limited section of the multidimensional 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 quantity includes, for example, an excess, a skewness, a median, and / or a characteristic function. Also, combinations among the above are possible.
- 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 shape with a hole or an opening in 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 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 timely manner can be provided.
- the useful signal is a synchronization signal.
- a useful signal is composed of a plurality of carrier signals, each carrier signal in a subchannel being modulated by a separate element, the elements being generated according to a predetermined synchronization matrix
- the generated groove signal is a multidimensional useful signal as described above.
- the synchronization matrix is preferably a multi-dimensional synchronization matrix.
- An embodiment consists in that the useful signal is transmitted substantially at the beginning and / or several times during an information transmission.
- a device for generating a Useful signal comprising a processor unit and / or an at least partially hardwired circuit arrangement, which is set up such that the method can be carried out as described herein,
- the device may comprise or be embodied as: a measuring device, a diagnostic device, a counter, an information acquisition device, a control device, a meter and / or a corresponding system.
- 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.
- Fig.l a block diagram comprising units for signal processing, which allow generation of a synchronization signal at a transmitter as well as an element-wise reception or a detection of the element-by-element received synchronization signal at a receiver;
- FIG. 2 shows a block diagram comprising units for
- Subareas of a two-dimensional signal are used to determine a noise component
- Useful signal s (t, f) is included in the input signal r (t, f);
- the signals mentioned here include or are real or complex, in particular multi-dimensional signals.
- 1 shows a block diagram comprising units for signal processing which enable a modulation or coding of a synchronization signal at a transmitter 120 as well as a demodulation or a detection of the coded synchronization signal at a receiver 130.
- Synchronization signal assumed, with any other type of useful signal is coded or decoded.
- the transmitter 120 has a unit for bit and / or symbol modulation 101 or coding, which is connected to a unit 102 on the basis of which an inverse time-frequency transformation or a signal synthesis by means of different carrier signals he follows.
- the output signal of the unit 102 is subjected to parallel-to-serial conversion in a unit 103 and sent to a receiver 130 via a transmission channel 104.
- the transmission channel has a fault which may in particular be a non-Gaussian disturbance.
- At the transmitter 120 becomes a synchronization signal from several different carrier signals composed, each by the
- the synchronization signals are based on a given two-dimensional synchronization matrix generated. This can be done for example by a frequency modulation and / or by a differential modulation.
- an element the synchronization signal is a functional dependency comprising at least one other element from the same subchannel j and / or with at least one other element from a subchannel
- a synchronization signal generated in this way can be sent at the beginning of an information transmission and optionally several times during the information transmission.
- the unit 109 provides at its output individual elements of a synchronization matrix prepared based on a hard and / or soft decision (hard decision / soft decision).
- a time-frequency transformation of the input signal ⁇ in individual time-frequency signal components performed based on the reference signals
- Such a transformation can be, for example, a short-time Fourier transformation, a wavelet transformation or carried out by means of a filter bank.
- the signal obtained from the unit 107 is supplied either directly or via the unit 108 of the unit 109.
- time-frequency input signal components may be partially or completely canceled depending on the actual disturbance and the remaining input signal components with corresponding noise signal estimates and / or provided with corresponding estimates of a strength of a useful signal.
- Interference suppression may alternatively also be provided before the time-frequeriz transformation 107.
- the individual elements the synchronization matrix with each other made comparable on the basis of said hard and / or soft decisions.
- a hard decision includes, for example, an assignment of a fixed quantities to a predetermined value. This can be done for example by a comparison with the predetermined value.
- a soft decision is made, in particular, if the final decision is deferred.
- an input if it has a value that does not allow a clear decision, may be stored in a context, e.g. their timing, in order to obtain greater certainty in the final decision.
- the processing of the signals in the unit 109 in particular in the context of pemodulation, in particular a functional dependence of a single element (in particular, each such element) of the synchronization signal from at least one other element from the same channel j and / or with at least one other element from a subchannel considered.
- the aforementioned estimate of the noise component and / or the estimation of the strength of the useful signal be taken into account.
- a correlation coefficient is determined in particular for each time point U. This correlation coefficient is determined by the two-dimensional coefficient matrix and the Section of the data stream of the elements Reaches and / or exceeds the value of
- the synchronization signal can be regarded as detected (detection in the unit 111).
- synchronization phase be checked if the value of the correlation coefficient has still improved.
- the better value of the correlation coefficient used to the timing of the synchronization signal even more accurate to capture.
- a predetermined period of time is waited in the unit 112 and the best time position of the synchronization signal during this Duration determined.
- the unit 108 will be explained in more detail below.
- interference signal component and the strength of the useful signal component can be at least partially dependent on one another.
- Fig.2 is an input signal a serial-to-parallel conversion 201 and then subjected to a time-frequency transformation 202.
- a time-frequency transformation 202 can take place.
- the result of the time-frequency transformation 202 is a multi-dimensional signal which is stored in a memory 203.
- the memory 203 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.
- 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 it becomes the time-frequency distribution of the multidimensional signal preferably continuously
- this subset is an arbitrary pattern of or a choice from the multi-dimensional signal can correspond. Is it, for example, the multi-dimensional signal by a two-dimensional time-frequency consideration, this subset may comprise at least one section in this plane, in particular a plurality of sections, possibly also periodically recurring sections.
- the useful signal component provides in the input signal even no or only a negligible contribution to the estimated noise component
- those signal components dme appear interesting for further processing or detection, subjected to a comparison in a unit 205.
- One in such a comparison may be the signal components
- Signal barriers especially non-linear signal barriers
- signal passing properties of the signal barriers based on the estimated star signal components or optionally based on the estimated useful signal strength controlled and / or adjusted.
- the output signal additionally based on the estimated useful signal strength be determined.
- a difference between the estimated amplitude or the strength of the useful signal and the estimated noise is determined and fed to a threshold comparison: the greater the difference, the less the reception signal suppressed. The smaller the difference, the stronger the received signal becomes suppressed.
- the received signal be completely suppressed.
- the respective output signal remains the corresponding estimated interference signal and / or the estimated magnitude of the wanted signal assigned as an indicator of the quality of the useful signal.
- the estimated useful signal or its strength or level Ai (U, fj) via a unit 212 for inverse time-frequency transformation into a signal ⁇ ⁇ (u) and on by means of a unit 213 for parallel-to-serial conversion into a serial signal be implemented.
- 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 individual elements From the sender are the individual elements transmit the synchronization signals distributed over multiple frequency channels (or frequency sub-channels), with the individual elements the Synehronisationssignale have a functional dependence on each other. Such a functional dependency can in particular be given for a time U either in a time range and / or in a frequency range.
- a further advantage of the approach proposed here is that when digitally receiving each individual element of the synchronization matrix Gkj, a decision is made about the assignment of this element (hard and / or soft decision). This can be advantageous a recognition of the synchronization signal or useful signal also take place if the transmission channel has disturbances other than white noise,
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Dc Digital Transmission (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/052293 WO2010078876A2 (de) | 2008-02-26 | 2008-02-26 | Verfahren zur detektion sowie zur generierung eines nutzsignals und zugehörige vorrichtungen sowie kommunikationssystem |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2248268A2 true EP2248268A2 (de) | 2010-11-10 |
Family
ID=42246102
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08878341A Withdrawn EP2248268A2 (de) | 2008-02-26 | 2008-02-26 | Verfahren zur detektion sowie zur generierung eines nutzsignals und zugehörige vorrichtungen sowie kommunikationssystem |
Country Status (5)
Country | Link |
---|---|
US (1) | US8374229B2 (de) |
EP (1) | EP2248268A2 (de) |
CN (1) | CN102027680B (de) |
HK (1) | HK1152418A1 (de) |
WO (1) | WO2010078876A2 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013214272A (ja) * | 2012-03-08 | 2013-10-17 | Sony Corp | 画像処理装置、および画像処理方法、並びにプログラム |
CN103731168A (zh) * | 2013-12-06 | 2014-04-16 | 南京智达康无线通信科技股份有限公司 | 用于1m接收灵敏度的改善方法 |
JP6165348B2 (ja) * | 2014-09-05 | 2017-07-19 | 三菱電機株式会社 | 干渉識別装置、無線通信装置および干渉識別方法 |
DE102015210102A1 (de) * | 2015-06-02 | 2016-12-08 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Ermitteln eines Nutzsignals |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070159958A1 (en) * | 2003-12-18 | 2007-07-12 | Chang-Jun Ahn | Transmitter, receiver, transmitting method, receiving method, and program |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7020226B1 (en) * | 2002-04-04 | 2006-03-28 | Nortel Networks Limited | I/Q distortion compensation for the reception of OFDM signals |
CN101292462B (zh) * | 2005-10-14 | 2010-12-29 | 艾利森电话股份有限公司 | 位串行数据流中的干扰抑制 |
CN101060505B (zh) * | 2006-04-19 | 2011-06-01 | 鼎桥通信技术有限公司 | 无线移动通信系统中的联合信道估计方法与估计装置 |
US8126103B2 (en) * | 2006-12-11 | 2012-02-28 | New Jersey Institute Of Technology | Frame synchronization using correlation between permuted sequences |
CN101056296A (zh) * | 2007-05-25 | 2007-10-17 | 东南大学 | 用于多径衰落信道环境下正交频分复用符号定时同步方法 |
-
2008
- 2008-02-26 WO PCT/EP2008/052293 patent/WO2010078876A2/de active Application Filing
- 2008-02-26 US US12/919,340 patent/US8374229B2/en not_active Expired - Fee Related
- 2008-02-26 EP EP08878341A patent/EP2248268A2/de not_active Withdrawn
- 2008-02-26 CN CN200880127519.9A patent/CN102027680B/zh not_active Expired - Fee Related
-
2011
- 2011-06-22 HK HK11106475.8A patent/HK1152418A1/zh not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070159958A1 (en) * | 2003-12-18 | 2007-07-12 | Chang-Jun Ahn | Transmitter, receiver, transmitting method, receiving method, and program |
Also Published As
Publication number | Publication date |
---|---|
HK1152418A1 (zh) | 2012-02-24 |
US8374229B2 (en) | 2013-02-12 |
CN102027680A (zh) | 2011-04-20 |
WO2010078876A9 (de) | 2010-09-16 |
WO2010078876A2 (de) | 2010-07-15 |
CN102027680B (zh) | 2016-05-04 |
US20110007791A1 (en) | 2011-01-13 |
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