WO2003026240A2 - Verfahren zum übertragen von daten durch mehrträger-modulation - Google Patents
Verfahren zum übertragen von daten durch mehrträger-modulation Download PDFInfo
- Publication number
- WO2003026240A2 WO2003026240A2 PCT/AT2002/000262 AT0200262W WO03026240A2 WO 2003026240 A2 WO2003026240 A2 WO 2003026240A2 AT 0200262 W AT0200262 W AT 0200262W WO 03026240 A2 WO03026240 A2 WO 03026240A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oversampled
- functions
- dirac
- time
- data
- Prior art date
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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
- H04L27/2602—Signal structure
-
- 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
- H04L27/2614—Peak power aspects
Definitions
- the invention relates to a method for transmitting data by multi-carrier modulation, the data being combined into blocks on the transmitter side and modulated in blocks by inverse discrete Fourier transformation (IDFT), and wherein a plurality of carriers, i.e. Components of the DFT blocks are reserved, which are not occupied by data, and these carriers are occupied in such a way that they generate a lot of time functions which, after filtering, have Dirac-like properties.
- IDFT inverse discrete Fourier transformation
- the data signals are demodulated block by block using Discrete Fourier Transformation (DFT).
- DFT Discrete Fourier Transformation
- Such a transmission of data with multicarrier transmission, with a large number of carrier frequencies, is used, for example, 1-wire-bound, but also in the radio area, for broadcast systems and for access to data networks, such as the Internet.
- One problem is the resulting high peak values of the time signal, which are reduced iteratively.
- multicarrier transmission which is also known as “Discrete Multitone (DMT)” transmission or “Orthogonal Frequency Division Multiplex (OFDM)” transmission.
- DMT Discrete Multitone
- OFDM Orthogonal Frequency Division Multiplex
- the signal is generated by an IFFT (Inverse Fast Fourier Transform) transformation, the components of the vector in the DFT (Discrete Fourier Transform) area being assigned signal points of a QAM (Quadrature Amplitude Modulation).
- the IFFT transform creates a signal with a block structure in the time domain.
- a cyclic prefix the so-called guard interval, is used for DMT or OFDM transmission.
- the frame end is cyclically placed in front of the block.
- the convolution with the channel impulse response then appears as a cyclic convolution, which in the DFT range is achieved by simple multiplication can be described with complex coefficients.
- the equalization is simplified, which can now take place in the DFT range and then corresponds to a simple AGC (Automatic Gain Control) for each wearer.
- AGC Automatic Gain Control
- a time function with Dirac-like properties is used.
- Such a Dirac-like function is characterized by a dominant impulse. Secondary maxi a should be significantly smaller in magnitude than this dominant impulse, for example less than half.
- the Dirac-like functions are generated by reserved carriers, which can then no longer be used for data transmission. This means that these carrier positions are initially set to zero.
- This Dirac-like function which only occupies the reserved carriers, is then subtracted in the time domain weighted with an amplitude factor that is proportional to the difference between the maximum peak value x m and the desired maximum value Xcarget.
- the Dirac-like function is cyclically shifted to the place of the maximum value.
- the shift set of the DFT transformation ensures that only the reserved carriers are occupied even after the shift.
- Step No. 1 Initialization of X as a DFT area data vector with zeroing of the reserved carriers
- Step No. 3 Search for the maximum value x m (i) and the associated position m within the vector x:
- the inventive method of the type mentioned is accordingly characterized in that the time functions are generated in such a way that the Dirac-like time functions obtained after the filtering have their maxima in an oversampled time solution at different, preferably adjacent locations, that both the oversampled Dirac -like time functions after filtering as well as the associated non-oversampled filter input functions are stored, and that a pair is iteratively selected from the pairs of stored time functions or filter input functions, which is applied by applying the displacement set to the position of one by one Data occupancy of the remaining carriers, including any interactive modifications already made, is shifted to the peak value and then weighted by a factor is subtracted from the time signal, the iterative modifications being parallel to the time signal in oversampled raster after filtering and applied to the associated time signal without oversampling and without filtering.
- the number of iterations is expediently determined by specifying a threshold value which is selected in accordance with the desired signal quality, and in this context an advantageous embodiment of the method according to the invention is characterized in that the data, after a maximum number of iterations has been exceeded, is exceeded by all values of the oversampled time functions or falling below a predetermined threshold by transmitting the non-oversampled time function via real filter arrangements.
- the amount of oversampled Dirac-like time functions has temporally adjacent maxima, selected during the iterative processing by m or L and by [m / Lj clock units (normal sampling grid) or L- [/ Lj clock units (oversampled) are shifted cyclically, where m indicates the maximum position in the oversampled clock and L indicates the oversampling.
- the factor with which the shifted function pair is weighted in the iterative processing is formed by a step size () and by exceeding a predetermined threshold (x t ar ge t) is defined by the oversampled time signal ( ⁇ m (i) ).
- the method according to the invention can advantageously be used both for data transmission via cable and for wireless transmission.
- the baseband transmission used in a transmission via cable a further development of the invention preferably provides that for one Reserved carriers in line-bound transmission of the data in pairs, corresponding to complex conjugate pairs in the DFT range, are selected.
- the maximum of the Dirac-like function is made to coincide with a peak of the time signal to be reduced by cyclical shifting.
- one of the Dirac-like function pairs is selected and weighted with a step size and the exceeding of a predetermined amplitude threshold.
- Fig.l is a block diagram of a transmission device with a transmitter (Fig.la) and receiver (Fig.lb) for performing the method according to the invention;
- FIG. 2 shows in a diagram the generation of the two function sets used in the method according to the invention, namely of Dirac-like feed functions and of corresponding oversampled time functions;
- 3 shows, in a comparable diagram, the parallel signal processing provided in the method according to the invention, namely the non-oversampled time function and the oversampled time function; 4 shows in a diagram the relative frequency distribution (or density) over a normalized voltage when using the method according to the invention in comparison with known techniques;
- FIG. 6 shows a diagram of a Dirac-like time function with a maximum at adjacent positions in an oversampled time resolution.
- Fig.l the basic arrangement of transmitter 2 and receiver 3 of a DMT transmission device 1 is shown, with insignificant components have not been shown. Since the extension by the guard interval, as mentioned, plays no role for the technology according to the invention, this is likewise omitted in FIG. 1.
- the transmitter 2 has a serial-parallel converter 4; a bit allocation module 5 for bit allocation to the carriers, with individual carriers being assigned zero for the method according to the invention; a QAM mapping module 6 for assigning the QAM points, the reserved carriers being filled with zero again; an IFFT module that represents the actual modulation; a PAR reduction module 8; a parallel-serial converter 9; and an output unit 10 with a filter function.
- the receiver 3 contains: a reception filter 11; a parallel-to-serial converter 12; an FFT module 13 for demodulation; a QAM demapping module 14 for the backward assignment of the QAM points to bits, the unused carriers not being evaluated; and a serial-parallel converter 15 for outputting the data.
- the components 4 to 15 shown in FIG. 1 are in principle conventional components, which can also be implemented in software, and which are set up accordingly for carrying out the method according to the invention; this applies in particular to the PAR reduction module 8, the function of which is explained in detail below.
- (arbitrary) filter functions are included in the transmission method according to the invention without the reduction of the crest factor having been significantly impaired.
- IDFT length used is LN, where N is the original transformation length.
- the method L according to the invention uses those functions which, if possible, have directly adjacent peak values in the higher temporal resolution.
- the filter function is already taken into account when defining these Dirac-like functions.
- the reserved positions of a Dirac-like function are defined in the DFT area in such a way that the desired Dirac-like form is present after the filter (10 in FIG.
- Fig. 2 shows the generation of the two function sets in detail. The selection of the reserved carriers (frequencies) for a Dirac-like function in the oversampled time range is summarized in block 20.
- the upper branch 21 with a block 22 illustrating the oversampling by L, the filter simulation (LP) at block 23, the extended IFFT of the length LN at block 24 and the search for the maximum at block 25 serve the maximum position in the oversampled time range to determine, in the shift operation shown in block 26 in the DFT area (application of the shift set), first to shift the maximum to the zero position and then - at 27 - also to generate the L second-shifted Dirac-like functions. This takes place in the DFT area and only affects the reserved carriers.
- at block 26 the normal tion.
- the maximum position m is sought, but this is done in the oversampled higher time resolution.
- the modulo operation m mod L then serves to select the Dirac-like functions in parallel in the oversampled version and in the version in the original scanning grid.
- the method according to the invention shifts by [m / Lj in the original scanning grid and by L- [m / Lj in the oversampled grid in order to shift the maximum of the Dirac-like functions to the desired position. (The so-called Gauss brackets are denoted by [J, which mean rounding off).
- the modification by the selected and shifted Dirac-like functions takes place in parallel in the oversampled and normal scanning grid.
- the functions are weighted with a step size and the size of the threshold exceeded.
- the upper branch 32 consisting of switches 33 (START), 34 (STOP), an addition 35 and a multiplication 36, shows the iterative change of the non-oversampled time function, while the lower branch 37 with switches 38 (START), 39 (STOP ), an addition 40 and a multiplication 41 carries out the associated modification in the oversampled time pattern.
- the oversampling (L) of the original time functions formed by the user data, carried out at block 42, is followed by the replication of a real filter (LP) shown at block 43.
- this replication can also alternatively take place in the DFT area, with which the two time functions x (0) and ⁇ 0) each can then be generated in parallel with IFFT transformations of lengths N and LN.
- Fig.3 is only that Time domain simulation of the filter shown.
- the search for the maximum point shown in block 44 and the weighting illustrated in block 45 largely correspond to steps 3 and 5 of the Tellado method described above in the method according to the invention, but in the method according to the invention these steps take place at an over-sampled time interval.
- the query of the method according to the invention shown at 46 corresponds to step No. 4 of the Tellado method.
- the pairs of Dirac-like pattern functions determined by the method part described with reference to FIG. 2 are kept in a memory, cf.
- L 4 has proven to be sufficient as oversampling.
- DAB Digital Audio Broadcasting
- DVB Digital Video Broadcasting
- HIPERLAN 2 Wireless LAN
- the cable is a baseband transmission, in which conjugate-complex pairs are always to be considered in the DFT area, whereas this is not the case in the radio area.
- this also means that when using cables, the carriers reserved for the method according to the invention must be selected in pairs (step 20 in FIG. 1). The required proportion of reserved carriers is approximately 5%.
- the greatest PAR reduction is seen in the first iterations. More than 20 iterations make little sense, often 10 iterations will suffice.
- FIG. 6 shows a function curve for the Dirac-like time functions obtained after the filtering, in which normalized samples are plotted over the numbers of the samples (as a measure of the time), the maxima (in the oversampled time resolution) being adjacent Positions available.
- the maximum of the Dirac-like function pm is brought to coincide with a peak to be reduced at the point m of the time signal x (1) by means of cyclical shifting.
- one of the Dirac-like function pairs is selected and weighted with a step size ( «) and the exceeding of a predetermined amplitude threshold.
- the signal which is not oversampled is output to the following transmission stages, in particular the real filters.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/489,065 US7532678B2 (en) | 2001-09-14 | 2002-09-11 | Method for transmitting data by multi-carrier modulation |
DE10294307.9T DE10294307B4 (de) | 2001-09-14 | 2002-09-11 | Verfahren zum Übertragen von Daten durch Mehrträger-Modulation |
AU2002340605A AU2002340605A1 (en) | 2001-09-14 | 2002-09-11 | Method for transmitting data by multi-carrier modulation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0145101A AT411002B (de) | 2001-09-14 | 2001-09-14 | Verfahren zum übertragen von daten durch mehrträger-modulation |
ATA1451/2001 | 2001-09-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2003026240A2 true WO2003026240A2 (de) | 2003-03-27 |
WO2003026240A3 WO2003026240A3 (de) | 2003-09-12 |
Family
ID=3688246
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT2002/000262 WO2003026240A2 (de) | 2001-09-14 | 2002-09-11 | Verfahren zum übertragen von daten durch mehrträger-modulation |
Country Status (6)
Country | Link |
---|---|
US (1) | US7532678B2 (de) |
CN (1) | CN100544337C (de) |
AT (1) | AT411002B (de) |
AU (1) | AU2002340605A1 (de) |
DE (1) | DE10294307B4 (de) |
WO (1) | WO2003026240A2 (de) |
Cited By (11)
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DE10320916A1 (de) * | 2003-05-09 | 2004-12-09 | Infineon Technologies Ag | Verfahren zur Crestfaktor-Reduzierung und Multiträger-Datentübertragungssystem |
DE10320917A1 (de) * | 2003-05-09 | 2004-12-09 | Infineon Technologies Ag | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
WO2004110011A1 (de) * | 2003-06-06 | 2004-12-16 | Infineon Technologies Ag | Schaltung und verfahren zur crestfaktor-reduzierung |
WO2004110010A1 (de) * | 2003-06-06 | 2004-12-16 | Infineon Technologies Ag | Verfahren zur crestfaktor-reduzierung |
DE10326760A1 (de) * | 2003-06-13 | 2005-01-13 | Infineon Technologies Ag | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
DE10325839A1 (de) * | 2003-06-06 | 2005-01-13 | Infineon Technologies Ag | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
DE10325833A1 (de) * | 2003-06-06 | 2005-01-20 | Infineon Technologies Ag | Verfahren und Schaltung zur Cresfaktor-Reduzierung |
DE10325835A1 (de) * | 2003-06-06 | 2005-01-20 | Infineon Technologies Ag | Verfahren zur Modellierung eines Modellfilters und Schaltung |
DE10325834A1 (de) * | 2003-06-06 | 2005-01-20 | Infineon Technologies Ag | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
US7693118B2 (en) | 2004-10-12 | 2010-04-06 | Deutsches Zentrum für Luft- und Raumfahrt e. V. | Method for spectral side lobe suppression in OFDM-based communication systems |
US7864873B2 (en) | 2004-10-12 | 2011-01-04 | Deutsches Zentrum für Luft- und Raumfahrt e. V. | Method for spectral side lobe suppression in OFDM-based communication system |
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JP4837669B2 (ja) * | 2005-10-06 | 2011-12-14 | パナソニック株式会社 | マルチキャリア送信装置 |
JP4247267B2 (ja) * | 2006-07-31 | 2009-04-02 | 株式会社エヌ・ティ・ティ・ドコモ | 無線送信機、無線受信機、無線通信システム、及び無線信号制御方法 |
US8654887B2 (en) | 2012-01-31 | 2014-02-18 | Futurewei Technologies, Inc. | Methods and systems for peak-to-average power reduction without reducing data rate |
US9882756B2 (en) | 2014-01-16 | 2018-01-30 | Crestcom, Inc. | Communication system with PAPR management using noise-bearing subcarriers |
CN104410594B (zh) * | 2014-12-18 | 2017-10-24 | 中国人民解放军信息工程大学 | 符号检测方法、装置及通信设备 |
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WO2000005850A1 (fr) * | 1998-07-24 | 2000-02-03 | Thomson Multimedia | Procede de demodulation psk |
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- 2002-09-11 CN CNB028209931A patent/CN100544337C/zh not_active Expired - Fee Related
- 2002-09-11 DE DE10294307.9T patent/DE10294307B4/de not_active Expired - Lifetime
- 2002-09-11 US US10/489,065 patent/US7532678B2/en active Active
- 2002-09-11 AU AU2002340605A patent/AU2002340605A1/en not_active Abandoned
- 2002-09-11 WO PCT/AT2002/000262 patent/WO2003026240A2/de not_active Application Discontinuation
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Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10320916A1 (de) * | 2003-05-09 | 2004-12-09 | Infineon Technologies Ag | Verfahren zur Crestfaktor-Reduzierung und Multiträger-Datentübertragungssystem |
DE10320917A1 (de) * | 2003-05-09 | 2004-12-09 | Infineon Technologies Ag | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
DE10320916B4 (de) * | 2003-05-09 | 2012-08-30 | Lantiq Deutschland Gmbh | Verfahren zur Crestfaktor-Reduzierung und Multiträger-Datenübertragungssystem |
DE10325834A1 (de) * | 2003-06-06 | 2005-01-20 | Infineon Technologies Ag | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
US7830783B2 (en) | 2003-06-06 | 2010-11-09 | Lantiq Deutschland Gmbh | Method and circuit for reducing the crest factor |
DE10325836A1 (de) * | 2003-06-06 | 2005-01-13 | Infineon Technologies Ag | Verfahren zur Crestfaktor-Reduzierung |
DE10325838A1 (de) * | 2003-06-06 | 2005-01-13 | Infineon Technologies Ag | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
DE10325839A1 (de) * | 2003-06-06 | 2005-01-13 | Infineon Technologies Ag | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
DE10325833A1 (de) * | 2003-06-06 | 2005-01-20 | Infineon Technologies Ag | Verfahren und Schaltung zur Cresfaktor-Reduzierung |
DE10325835A1 (de) * | 2003-06-06 | 2005-01-20 | Infineon Technologies Ag | Verfahren zur Modellierung eines Modellfilters und Schaltung |
WO2004110010A1 (de) * | 2003-06-06 | 2004-12-16 | Infineon Technologies Ag | Verfahren zur crestfaktor-reduzierung |
WO2004110011A1 (de) * | 2003-06-06 | 2004-12-16 | Infineon Technologies Ag | Schaltung und verfahren zur crestfaktor-reduzierung |
DE10325833B4 (de) * | 2003-06-06 | 2012-08-30 | Lantiq Deutschland Gmbh | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
US7839947B2 (en) | 2003-06-06 | 2010-11-23 | Lantiq Deutschland Gmbh | Circuit and method for reducing the crest factor |
DE10325834B4 (de) * | 2003-06-06 | 2010-12-16 | Infineon Technologies Ag | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
DE10325838B4 (de) * | 2003-06-06 | 2012-03-08 | Lantiq Deutschland Gmbh | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
DE10325836B4 (de) * | 2003-06-06 | 2011-03-03 | Infineon Technologies Ag | Verfahren zur Crestfaktor-Reduzierung |
US8045627B2 (en) | 2003-06-06 | 2011-10-25 | Lantiq Deutschland Gmbh | Method for reducing the crest factor |
DE10325835B4 (de) * | 2003-06-06 | 2012-03-08 | Lantiq Deutschland Gmbh | Verfahren zur Modellierung eines Modellfilters und Schaltung |
DE10325839B4 (de) * | 2003-06-06 | 2012-03-08 | Lantiq Deutschland Gmbh | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
DE10326760A1 (de) * | 2003-06-13 | 2005-01-13 | Infineon Technologies Ag | Verfahren und Schaltung zur Crestfaktor-Reduzierung |
US7864873B2 (en) | 2004-10-12 | 2011-01-04 | Deutsches Zentrum für Luft- und Raumfahrt e. V. | Method for spectral side lobe suppression in OFDM-based communication system |
US7693118B2 (en) | 2004-10-12 | 2010-04-06 | Deutsches Zentrum für Luft- und Raumfahrt e. V. | Method for spectral side lobe suppression in OFDM-based communication systems |
Also Published As
Publication number | Publication date |
---|---|
WO2003026240A3 (de) | 2003-09-12 |
CN100544337C (zh) | 2009-09-23 |
US7532678B2 (en) | 2009-05-12 |
ATA14512001A (de) | 2003-01-15 |
DE10294307B4 (de) | 2014-07-31 |
US20040264508A1 (en) | 2004-12-30 |
AT411002B (de) | 2003-09-25 |
AU2002340605A1 (en) | 2003-04-01 |
DE10294307D2 (de) | 2004-09-02 |
CN1575573A (zh) | 2005-02-02 |
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