WO1998021860A1 - Verfahren zur decodierung von komplementären codes - Google Patents
Verfahren zur decodierung von komplementären codes Download PDFInfo
- Publication number
- WO1998021860A1 WO1998021860A1 PCT/DE1997/002437 DE9702437W WO9821860A1 WO 1998021860 A1 WO1998021860 A1 WO 1998021860A1 DE 9702437 W DE9702437 W DE 9702437W WO 9821860 A1 WO9821860 A1 WO 9821860A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- phases
- phase
- signal
- decoding
- decoding signals
- Prior art date
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
- H04L27/2602—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
- H04L27/2615—Reduction thereof using coding
- H04L27/2617—Reduction thereof using coding using block codes
-
- 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
- H04L27/2621—Reduction thereof using phase offsets between subcarriers
-
- 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
- H04L27/2649—Demodulators
Definitions
- the invention relates to a method for decoding signals of a multi-carrier transmission method, which are encoded with complementary codes, according to the preamble of the main claim.
- OFDM Orthogonal Fequency Division Multiplexing
- Transmission linear transmitters with low efficiency are used to avoid non-linear distortion of the signals.
- the method according to the invention for decoding with the characterizing features of the main claim contains a regulation according to which the phases of the coded signal are evaluated and used for the calculation of the phases of the original signal.
- the calculation and decoding of phases that is to say "polar coordinates" gives a simple solution which requires few arithmetic operations.
- the decoding method works with high performance, the implementation effort being correspondingly low.
- a particularly simple decoding uses a weighted summation of the phase component to determine the original phases.
- the method can be optimized by weighting the phase components in proportion to the signal-to-noise ratio. In some cases it is better to choose the weighting of the phase components proportional to the ratio of the total power of the signal to the power of the phase component.
- a particularly simple sum Mation is obtained if you do not carry out weighting but set all weighting factors to one.
- An improvement in the decoding can be achieved by selecting the phase component which has the greatest weight for each partial decoding.
- a simplification with regard to the number of arithmetic operations is obtained by determining the negligible code symbols by comparing their amounts with a predetermined threshold value.
- FIG. 1 shows the schematic structure of a multi-carrier transmitter and receiver.
- a transmission signal of a multi-carrier method is considered, which is transmitted using OFDM technology.
- the method used for the transmission of digital radio signals uses differential 4-phase shift keying (DQPSK differential quadrature phase shift keying). Since it is not the phase itself, but the difference that is transmitted between two successive phases, there is a phase difference coding with eight possible carrier phases. In order to reduce the crest factor, the ratio of peak power to medium power, the independent
- y (i) (P ⁇ (i) exp ( ⁇ _ (i)), p 2 (i) exp ( ⁇ 2 (i)), ..., p N (i) exp ( ⁇ N (i))), the case being a real one (disturbed) transmission is characterized by an additional amplitude factor p v (i) e R and by ⁇ v (i) ⁇ ⁇ v (i).
- the task of decoding is to recover the information-carrying phases ⁇ p v (i).
- the received complex code symbols x v (i) e C are not used, but rather the associated phases
- the decoding is based on the solution of the system of equations (1) according to known methods e.g. the exchange procedure according to Stiefel. It is sufficient to use K of the N equations, since the remaining K equations are linearly dependent on the others as follows, i.e. in the case of an ideal transmission, they do not provide any additional information:
- the resulting decoding rule is:
- REPLACEMENT BUTT (RULE 26) the performance of the individual components related to the total performance of all sub-components is used
- Equal-gain combining is the weighted summation of the sub-components, the weighting factor being 1 for all sub-components.
- ⁇ 2 (o . [( ⁇ , (0- ⁇ 2 (' ' )) + ( ⁇ 3 (- 4 () + ( ⁇ 5 ⁇ - ⁇ 6 (0) + ( ⁇ 7 (- ⁇ 8 ( ) ]
- y ⁇ * (i) l 2 / ⁇ ⁇ / or p v 2 (i)
- y v (i) I 2 can be considered.
- y * denotes the complex conjugate value of y.
- the subcomponents are selected whose amount is greater than a certain threshold. This sub-component is used until its amount falls below the threshold. In this case, a new sub-component is determined that fulfills the selection condition.
- a simplification with regard to the number of arithmetic operations is obtained by selecting the negligible code symbols not by searching, but by comparing their amounts with a specific, predetermined threshold. The identified subset is retained during decoding until the condition is no longer met.
- decoding instructions can be implemented, for example, by means of a suitable digital signal processor (DSP).
- DSP digital signal processor
- Figure 1 shows a simplified block diagram of an OFDM transmitter and receiver.
- the information symbol a arrives in the parallel / serial converter 1 and from there into the M-stage phase shift keying PSK modulator 2. This produces a signal from the input symbol a, which is modulated in phase positions ⁇ .
- the complementary multi-phase code is applied to the signal.
- the implementation takes place e.g. through matrix multiplication as in the case of non-systematic block codes.
- a complex signal sequence x of length N arises in cathesic coordinates.
- a fast inverse Fourier transformer IFFT 4 processes the transmission signal 5.
- the transmission signal 5 is received in the receiving unit and converted via the fast Fourier transformer 6 FFT.
- the Cartesian coordinates y are converted into polar coordinates, i.e. the recovery of the phases.
- the signal is processed in block decoder 8 in accordance with the decoding specification.
- the information symbol a (i) is recovered from the decoded phases by quantization, and the signal is then converted again in parallel / serial 10. The reconstructed signal is thus present.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52202098A JP2001504289A (ja) | 1996-11-11 | 1997-10-22 | コンプリメンタリ符号の復号化のための方法 |
EP97946738A EP0938796A1 (de) | 1996-11-11 | 1997-10-22 | Verfahren zur decodierung von komplementären codes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19646299A DE19646299A1 (de) | 1996-11-11 | 1996-11-11 | Verfahren zur Decodierung von komplementären Codes |
DE19646299.1 | 1996-11-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998021860A1 true WO1998021860A1 (de) | 1998-05-22 |
Family
ID=7811157
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1997/002437 WO1998021860A1 (de) | 1996-11-11 | 1997-10-22 | Verfahren zur decodierung von komplementären codes |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0938796A1 (de) |
JP (1) | JP2001504289A (de) |
DE (1) | DE19646299A1 (de) |
WO (1) | WO1998021860A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6452958B1 (en) | 1996-07-30 | 2002-09-17 | Agere Systems Guardian Corp | Digital modulation system using extended code set |
US6404732B1 (en) | 1996-07-30 | 2002-06-11 | Agere Systems Guardian Corp. | Digital modulation system using modified orthogonal codes to reduce autocorrelation |
US5862182A (en) | 1996-07-30 | 1999-01-19 | Lucent Technologies Inc. | OFDM digital communications system using complementary codes |
DE102005059566B4 (de) * | 2005-12-13 | 2022-04-21 | Brueninghaus Hydromatik Gmbh | Vorrichtung und Verfahren zur zustandsabhängigen Wartung von hydrostatischen Verdrängereinheiten |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0822690A2 (de) * | 1996-07-30 | 1998-02-04 | Lucent Technologies Inc. | Kodierung zur Verminderung des Verhältnisses von Spitzenleistung zur Durchschnittleistung in Mehrträgermodulationssystemen |
-
1996
- 1996-11-11 DE DE19646299A patent/DE19646299A1/de not_active Withdrawn
-
1997
- 1997-10-22 WO PCT/DE1997/002437 patent/WO1998021860A1/de not_active Application Discontinuation
- 1997-10-22 JP JP52202098A patent/JP2001504289A/ja active Pending
- 1997-10-22 EP EP97946738A patent/EP0938796A1/de not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0822690A2 (de) * | 1996-07-30 | 1998-02-04 | Lucent Technologies Inc. | Kodierung zur Verminderung des Verhältnisses von Spitzenleistung zur Durchschnittleistung in Mehrträgermodulationssystemen |
Non-Patent Citations (3)
Title |
---|
POPOVIC B M: "SYNTHESIS OF POWER EFFICIENT MULTITONE SIGNALS WITH FLAT AMPLITUDE SPECTRUM", PROCEEDINGS OF EUSIPCO-90, FIFTH EUROPEAN SIGNAL PROCESSING CONFERENCE, vol. 1, 18 September 1990 (1990-09-18) - 21 September 1990 (1990-09-21), BARCELONA, SPAIN, pages 489 - 492, XP000358162 * |
VAN NEE R D J: "OFDM codes for peak-to-average power reduction and error correction", IEEE GLOBECOM 1996. PROCEEDINGS OF THE 1996 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, LONDON, UK, vol. 1, 18 November 1996 (1996-11-18) - 22 November 1996 (1996-11-22), ISBN 0-7803-3336-5, 1996, NEW YORK, NY, USA, IEEE, USA, pages 740 - 744, XP002058921 * |
WILKINSON T A ET AL: "MINIMISATION OF THE PEAK TO MEAN ENVELOPE POWER RATIO OF MULTICARRIER TRANSMISSION SCHEMES BY BLOCK CODING", 1995 IEEE 45TH VEHICULAR TECHNOLOGY CONFERENCE, vol. 2, 25 July 1995 (1995-07-25) - 28 July 1995 (1995-07-28), CHICAGO, IL, USA, pages 825 - 829, XP000551649 * |
Also Published As
Publication number | Publication date |
---|---|
DE19646299A1 (de) | 1998-05-14 |
EP0938796A1 (de) | 1999-09-01 |
JP2001504289A (ja) | 2001-03-27 |
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