WO2004036818A1 - Constellation rearrangement for arq transmit diversity schemes - Google Patents
Constellation rearrangement for arq transmit diversity schemes Download PDFInfo
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- WO2004036818A1 WO2004036818A1 PCT/EP2002/011694 EP0211694W WO2004036818A1 WO 2004036818 A1 WO2004036818 A1 WO 2004036818A1 EP 0211694 W EP0211694 W EP 0211694W WO 2004036818 A1 WO2004036818 A1 WO 2004036818A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1835—Buffer management
- H04L1/1845—Combining techniques, e.g. code combining
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/067—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing soft decisions, i.e. decisions together with an estimate of reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/345—Modifications of the signal space to allow the transmission of additional information
- H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
- H04L27/3472—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel by switching between alternative constellations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
Definitions
- the present invention relates generally to ARQ (re-) transmission techniques in wireless communication systems and in particular to a method, transceiver and receiver using transmit diversity schemes wherein data packets are transmitted using a first and a second transmission based on a repeat request, and the bit-to-symbol mapping is performed differently for different transmitted diversity branches.
- the invention is particularly applicable to systems with unreliable and time-varying channel conditions resulting in an improved performance avoiding transmission errors.
- transmit diversity techniques wherein one or several redundancy versions relating to identical data are transmitted on several (at least two) diversity branches "by default” without explicitly requesting (by a feedback channel) further diversity branches (as done in an ARQ scheme by requesting retransmissions).
- transmit diversity For example the following schemes are considered as transmit diversity:
- the transmitted signal originates from different sites, e.g. different base stations in a cellular environment.
- the transmitted signal originates from different antennas, e.g. different antennas of a multi-antenna base station.
- Polarization Diversity The transmitted signal is mapped onto different polarizations.
- the transmitted signal is mapped e.g. on different carrier frequencies or on different frequency hopping sequences.
- the transmitted signal is e.g. mapped on different interleaving sequences.
- ⁇ Multicode Diversity The transmitted signal is mapped on different codes in e.g. a CDMA (Code Division Multiple Access) system.
- CDMA Code Division Multiple Access
- Equal Gain Combining Combining received diversity branches with ignoring the differences in received SNR.
- ⁇ Maximal Ratio Combining Combining received diversity branches taking the received SNR of each diversity branch into account.
- the combining can be performed at bit-level (e.g. LLR) or at modulation symbol level.
- ARQ Automatic Repeat reQuest
- FEC Forward Error Correction
- HARQ hybrid ARQ
- the object of the invention is to provide an ARQ (re-) transmission method, a transmitter and a receiver which show an improved performance with regard to transmission errors. This object is solved by a method, transmitter and receiver as set forth in the independent claims.
- the invention is based on the idea to improve the performance at the receiver by applying different signal constellation mappings to the available distinguishable transmit diversity branches and ARQ (re-) transmissions.
- the invention is applicable to modulation formats, where more than 2 bits are mapped onto one modulation symbol, since this implies a variation in reliabilities for the bits mapped onto the signal constellation. The variations depend on the employed mapping and on the actually transmitted content of the bits.
- Averaging in the sense of the present invention is understood as a process of reducing the differences in mean combined bit reliabilities among the different bits of a data symbol. Although it might be that only after using several diversity branches or paths a perfect averaging with no remaining differences is achieved, averaging means in the context of the document any process steps in the direction of reducing the mean combined bit reliability differences.
- FIG. 1 an example for a 16-QAM signal constellation
- FIG. 2 an example for a different mapping of a 16-QAM signal constellation
- FIG. 3 two further examples of 16-QAM signal constellations
- FIG. 4 an exemplary embodiment of a communication system according to the present invention.
- FIG. 5 details of a table for storing a plurality of signal constellation patterns.
- the method described here performs a combined averaging of bit reliabilities considering the transmit diversity branches.
- the following detailed description is shown for a square 16-QAM with Gray mapping. However, without loss of generality the shown example is extendable to other M-QAM and M-PSK (with log 2 (/W) > 2) formats. Moreover, the examples are shown for transmit diversity and HARQ schemes transmitting an identical bit-sequence on both branches and all HARQ transmissions (single redundancy version scheme). Then again, an extension to a transmit diversity and HARQ scheme transmitting only partly identical bits on the diversity branches and HARQ transmissions can be accomplished.
- An example for a system using multiple redundancy versions is described in copending EP 01127244, filed on November 16, 2001. Assuming a Turbo encoder, the systematic bits can be averaged on a higher level as compared to the parity bits.
- the following example describes a method with two diversity branches and HARQ.
- the received diversity branches are combined at the receiver before applying the FEC decoder.
- a common combining technique is the maximal ratio combining, which can be achieved by adding the calculated log-likelihood-ratios LLRs from each individual received diversity branch.
- the mean LLR for i ⁇ and / 2 for a given transmitted modulation symbol yields the values given in Table 1 (substituting 4 0 2 by ⁇ ).
- Mean in this sense refers to that the mean received value for a given transmitted constellation point, exactly matches this transmitted constellation point. Individual samples of course experience noise according to the parameter K. However, for a Gaussian channel the mean value of the noise process is zero. In case of transmitted modulation symbols 0qr 1 1 2 and 1c7 ⁇ 1c/ 2> where c/i and q 2 are arbitrary, the magnitude of the mean LLR (/ ' ⁇ ) is higher than of the mean LLR (/ 2 ).
- the LLR for the MSB /-i depends on the content of the LSB / 2 ; e.g. in Figure 1 / ' 1 has a higher mean reliability in case the logical value for / 2 equals 1 (leftmost and rightmost columns).
- the MSBs / ' ⁇ have about three times the magnitude in LLR of / 2 .
- the receiver requests a retransmission (2 nd transmission).
- 2 nd transmission also 2 transmit diversity branches are available
- the 2 additional mappings mapping 3 and mapping 4 in Figure 3 are employed to further improve the averaging of the bit reliabilities as shown in Table 4.
- the averaging is performed perfectly after receiving 2 transmit diversity branches times 2 transmissions (possibility to employ 4 different mappings - sufficient for 16- QAM).
- Table 4 compares the LLRs with and without applying the proposed Constellation Rearrangement.
- mapping 2 can be obtained from mapping 1 by the following operations:
- those bits that end in positions 1 and 2 can also be inverted (resulting in a different mapping with an identical bit-reliability characteristics).
- mappings 1 to 4 (or mappings with equivalent bit reliabilities for / ' ⁇ , / 2 , qi and 2 ), where the bits always refer to the first transmission, and a long dash above a character denotes logical bit inversion of that bit:
- mappings should be employed for N > 1 diversity branches, where the order and the selection of the mappings is irrelevant, as long as the bit-reliability averaging process, meaning the reduction in differences in bit reliabilities) is maintained.
- the applied signal constellation mappings for modulation at the transmitter and demodulation at the receiver need to match for each individual transmit diversity branch. This can be achieved by appropriate signalling of parameters indicating the proper mapping or combination of mappings to be applied for the diversity branches and HARQ transmissions. Alternatively the definition of the mappings to be applied for transmit diversity branches and HARQ transmissions may be system predefined.
- Figure 4 shows an exemplary embodiment of a communication system according to the present invention. More specifically, the communication system comprises a transmitter 10 and a receiver 20 which communicate through a communication channel consisting of a plurality of diversity branches 40A, 40B and 40C. Although three diversity branches are illustrated in the figure, it becomes clear to a person skilled in the art that an arbitrary number of branches may be chosen.
- a data source 11 data packets are supplied to a FEC encoder 12, preferably a FEC Turbo encoder, where redundancy bits are added to correct errors.
- the bits output from the FEC encoder are subsequently supplied to a mapping unit 13 acting as a modulator to output symbols formed according to the applied modulation scheme stored as a constellation pattern in a table 15.
- the data symbols are applied to a transmission unit 30 for transmission over the branches 40A - C.
- the receiver 20 receives the data packets by the receiving unit 35.
- the bits are then input into a demapping unit 21 which acts as a demodulator using the same signal constellation pattern stored in the table 15 which was used during the modulation of these bits.
- the demodulated data packets received over one diversity branch are stored in a temporary buffer 22 for subsequent combining in a combining unit 23 with the data packets received over at least one other diversity branch.
- a retransmission is launched by an automatic repeat request issued by an error detector (not shown) with the result that an identical data packet is transmitted from the transmitter 10.
- the combining unit 23 the previously received erroneous data packets are soft-combined with the retransmitted data packets.
- a decoder decodes the bits and output a measure for the transmission quality, e.g. the bit-error- rate BER.
- table 15 stores a plurality of signal constellation patterns #0..#n which are selected for the individual transmissions over the individual diversity branches and HARQ transmissions according to a predetermined scheme.
- the scheme i.e. the sequence of signal constellation patterns used for modulating/- demodulating are either pre-stored in the transmitter and the receiver or are signalled by transmitter to the receiver prior to usage.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Power Engineering (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Error Detection And Correction (AREA)
- Transmitters (AREA)
Abstract
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Priority Applications (13)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020047012008A KR100789042B1 (en) | 2002-10-18 | 2002-10-18 | Constellation rearrangement for arq transmit diversity schemes |
PCT/EP2002/011694 WO2004036818A1 (en) | 2002-10-18 | 2002-10-18 | Constellation rearrangement for arq transmit diversity schemes |
US10/501,906 US7154961B2 (en) | 2002-10-18 | 2002-10-18 | Constellation rearrangement for ARQ transmit diversity schemes |
EP02790298A EP1552639B1 (en) | 2002-10-18 | 2002-10-18 | Constellation rearrangement for arq transmit diversity schemes |
AT02790298T ATE383689T1 (en) | 2002-10-18 | 2002-10-18 | RE-ARRANGEMENT OF SIGNAL CONSTELLATION FOR ARQ TRANSMIT DIVERSITY SCHEME |
EP08000127A EP1903711A3 (en) | 2002-10-18 | 2002-10-18 | Constellation rearrangement for ARQ transit diversity schemes |
JP2004543995A JP3885078B2 (en) | 2002-10-18 | 2002-10-18 | Constellation rearrangement for ARQ transmission diversity system |
AU2002368296A AU2002368296A1 (en) | 2002-10-18 | 2002-10-18 | Constellation rearrangement for arq transmit diversity schemes |
CN028280814A CN1620776B (en) | 2002-10-18 | 2002-10-18 | Constellation resetting of automatically repeat requesting transmitting diversity scheme |
DE60224588T DE60224588T2 (en) | 2002-10-18 | 2002-10-18 | REORGANIZATION OF THE SIGNAL CONSTELLATION FOR ARQ SENDEDIVERSITY SCHEME |
US11/633,421 US7567622B2 (en) | 2002-10-18 | 2006-12-05 | Constellation rearrangement for ARQ transmit diversity schemes |
US12/490,096 US20090262858A1 (en) | 2002-10-18 | 2009-06-23 | Constellation rearrangement for arq transmit diversity schemes |
US13/034,348 US8325845B2 (en) | 2002-10-18 | 2011-02-24 | Constellation rearrangement for ARQ transmit diversity schemes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/EP2002/011694 WO2004036818A1 (en) | 2002-10-18 | 2002-10-18 | Constellation rearrangement for arq transmit diversity schemes |
Related Child Applications (2)
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US10501906 A-371-Of-International | 2002-10-18 | ||
US11/633,421 Continuation US7567622B2 (en) | 2002-10-18 | 2006-12-05 | Constellation rearrangement for ARQ transmit diversity schemes |
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WO2004036818A1 true WO2004036818A1 (en) | 2004-04-29 |
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PCT/EP2002/011694 WO2004036818A1 (en) | 2002-10-18 | 2002-10-18 | Constellation rearrangement for arq transmit diversity schemes |
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US (4) | US7154961B2 (en) |
EP (2) | EP1552639B1 (en) |
JP (1) | JP3885078B2 (en) |
KR (1) | KR100789042B1 (en) |
CN (1) | CN1620776B (en) |
AT (1) | ATE383689T1 (en) |
AU (1) | AU2002368296A1 (en) |
DE (1) | DE60224588T2 (en) |
WO (1) | WO2004036818A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
US20090262858A1 (en) | 2009-10-22 |
EP1903711A3 (en) | 2008-11-12 |
US20110141994A1 (en) | 2011-06-16 |
JP2005533461A (en) | 2005-11-04 |
US8325845B2 (en) | 2012-12-04 |
DE60224588D1 (en) | 2008-02-21 |
ATE383689T1 (en) | 2008-01-15 |
US7154961B2 (en) | 2006-12-26 |
AU2002368296A1 (en) | 2004-05-04 |
US20070147531A1 (en) | 2007-06-28 |
JP3885078B2 (en) | 2007-02-21 |
CN1620776B (en) | 2010-05-12 |
KR100789042B1 (en) | 2007-12-26 |
US7567622B2 (en) | 2009-07-28 |
US20050193307A1 (en) | 2005-09-01 |
EP1903711A2 (en) | 2008-03-26 |
EP1552639B1 (en) | 2008-01-09 |
KR20040093702A (en) | 2004-11-08 |
CN1620776A (en) | 2005-05-25 |
DE60224588T2 (en) | 2008-05-21 |
EP1552639A1 (en) | 2005-07-13 |
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