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WO2004068735A1 - Procede et systeme pour determiner des profils puissance-temps de propagation lors de la transmission d'un flux de donnees par l'intermediaire de chemins multiples de transmission de donnees - Google Patents

Procede et systeme pour determiner des profils puissance-temps de propagation lors de la transmission d'un flux de donnees par l'intermediaire de chemins multiples de transmission de donnees Download PDF

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Publication number
WO2004068735A1
WO2004068735A1 PCT/EP2004/000693 EP2004000693W WO2004068735A1 WO 2004068735 A1 WO2004068735 A1 WO 2004068735A1 EP 2004000693 W EP2004000693 W EP 2004000693W WO 2004068735 A1 WO2004068735 A1 WO 2004068735A1
Authority
WO
WIPO (PCT)
Prior art keywords
correlation
data stream
length
partial
energy delay
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
Application number
PCT/EP2004/000693
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German (de)
English (en)
Inventor
Thuyen Le
Manfred Zimmermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Infineon Technologies AG
Original Assignee
Infineon Technologies AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Infineon Technologies AG filed Critical Infineon Technologies AG
Publication of WO2004068735A1 publication Critical patent/WO2004068735A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7113—Determination of path profile
    • 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
    • H04B7/0848—Joint weighting
    • 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
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/7117—Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
    • 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
    • H04B7/0848—Joint weighting
    • H04B7/0851—Joint weighting using training sequences or error signal
    • 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
    • H04B7/0848—Joint weighting
    • H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion

Definitions

  • the present invention relates to a method and an apparatus for receiving data streams via multiple data transmission paths, and in particular relates to a method for receiving a data stream from a data stream transmitter to at least one data stream receiver via at least one data transmission path, in which the transmission properties of the at least one a data transmission path can be determined.
  • a so-called "rake" receiver In a data transmission system, for example a CDMA modem, for example for use in a 3GPP-WCDMA-FDD device, a so-called "rake" receiver is used, which consists of different "fingers", each finger having a path of the delay profile received signal corresponds.
  • the number of fingers and the delay in each "finger" in a rake receiver are assigned based on a data path search unit.
  • the operating parameters of the data transmission path search unit are assigned by a "finger" management unit.
  • ISI inter-symbol interference
  • a technique is usually used in CDMA systems with which the data stream signals of all relevant data transmission paths are received, and these are then combined.
  • This is done in the prior art in a rake receiver which is a data stream receiver which receives as many multipath data stream signals as possible.
  • the rake receiver combines the signals from all of these paths in order to generate a data stream signal which is as "interference-free as possible" and which is stronger than the individual components. Individual paths are found by cross-correlating a reference pattern with the received signal.
  • the UMTS receiver estimates the energy delay profile of different data transmission streams in order to determine the amplitude and the delayed timing of the data transmission paths of data streams with respect to a receiver timing reference.
  • the data transmission path search unit now serves to determine an arrival time and reception energy of the data stream signals from the different data transmission paths.
  • CPICH Common Pilot Channel
  • the data streams for example of the pilot channel, are made up of frames and slots (data frames and data slots).
  • ms milliseconds
  • Each data slot has 2560 chips, which means that the chip frequency in this example is 3.84 MHz.
  • pilot signal sequences are transmitted via antenna 1 and antenna 2.
  • the correlation In order to determine the energy delay profile in the data stream receiver, in the case of transmission diversity, the correlation must be carried out for both the data transmission paths of an "antenna 1" and an "antenna 2".
  • the correlation length ⁇ corr is an even multiple of a pilot sequence symbol length, ie an even number of a CPICH symbol length of 256 chips.
  • Increasing the correlation length N corr desirably increases the signal-to-noise ratio in the case of an energy delay profile estimation, on the other hand, this energy delay profile estimation is then more sensitive. rather a sampling clock error. For this reason, an energy delay profile estimate must be averaged over time.
  • an energy delay profile estimate must disadvantageously be averaged over blocks of length N corr . Since the required correlation length N corr can be very large, a large buffer memory is required to store the signals before a correlation, which means an increased circuit complexity.
  • a major disadvantage of conventional systems is that the correlation length N corr is not constant and can vary in a wide range from one to several symbols.
  • the system architecture must expediently be designed in such a way that a maximum correlation length N corr can be processed, so that the available hardware is not optimally used.
  • the maximum value for the correlation length N corr is set to not greater than 2 using this concept in conventional data transmission systems, which means that the correlation is disadvantageously limited to 512 chips ,
  • An essential idea of the invention is to carry out different correlation functions between received signals and a pilot sequence signal, which has a predetermined symbol sequence, for the calculation of energy delay profiles, the correlation functions being able to be divided into partial correlations of a variable correlation length.
  • correlation functions or partial correlation functions can be calculated with a limited correlation length and that part can be reused.
  • Another advantage of the present invention is that the complexity of the filter arrangements used can be reduced.
  • the method according to the invention for determining energy delay profiles of a data stream from a data stream transmitter to a data stream receiver via at least one data transmission path, in which transmission properties of the at least one data transmission path can be determined essentially has the following steps: a) forming a first correlation function between a received signal and a first pilot sequence signal, which has a predetermined symbol sequence, in a correlation device, the first correlation having a variable correlation length;
  • the first and second correlation functions are provided after steps a) and b) above by forming partial correlations.
  • the correlation length of the partial correlations can advantageously be predetermined variably.
  • the partial correlations provided for forming the first and second correlation functions after steps c) and d) are accumulated.
  • the determination of an energy delay profile of the correlation functions is based on the above
  • Step e) is provided by summing the squares of the amounts of the first and second correlation functions.
  • the determination of the energy delay profile of the correlation functions after step e) above is provided by calculating the total energy of the corresponding data streams.
  • the at least one partial correlation is carried out for a sub-symbol length.
  • the correlation length of the at least one partial correlation is expediently provided independently of the total correlation length.
  • Rate provided which corresponds to the sampling frequency of the received data stream.
  • the partial correlations are provided for either the data stream transmitted via the first transmission device or the data flow transmitted via the second transmission device. According to yet another preferred development of the present invention, the partial correlations are reused several times within the processing device.
  • the real part and the imaginary part of complex results of the partial correlations are stored in separate buffer memories. It is also advantageous that the correlation length can be predetermined. According to yet another preferred development of the present invention, the correlation length of the correlation functions is an integer multiple of the symbol length. According to yet another preferred development of the present invention, the partial correlations for obtaining the overall correlation function are averaged using a running average.
  • a length of the input buffer memory corresponding to the length of the partial correlations is provided.
  • the device according to the invention for determining energy delay profiles of a data stream over at least one data transmission path essentially has:
  • a correlation device for forming a first correlation function between a received signal and a first pilot sequence signal, which has a predetermined symbol sequence, and for forming at least a second correlation function between the received signal and a second pilot sequence signal;
  • a determination device for determining an energy delay profile of the at least one data transmission path by means of the first and second correlation functions.
  • the correlation device has an input buffer memory, which advantageously has a size corresponding to the correlation length of the partial correlations.
  • the determination device has separate Buffer memory for storing the real part and the imaginary part of complex results of the partial correlations.
  • the determination device has one
  • FIG. 1 shows a schematic block diagram of a data transmission system with multiple data transmission paths
  • FIG. 2 shows a schematic structure of a pilot channel, via which a pilot sequence signal, which has a predetermined symbol sequence, can be transmitted;
  • FIG. 3 shows a block diagram of the device according to the invention for transmitting a data stream via at least one data transmission path
  • FIG. 4 shows a flow chart of a method for forming partial correlations according to a preferred exemplary embodiment of the present invention
  • FIG. 5 shows a schematic flowchart which shows a method with the coherent accumulation over four partial correlation lengths and a subsequent averaging over two correlations according to a preferred exemplary embodiment of the present invention.
  • FIG. 6 is a schematic flow diagram illustrating a method with coherent accumulation over two partial relations lengths and a subsequent averaging over three correlations according to a preferred embodiment of the present invention.
  • a data stream transmitter 200 here has one or more, typically two, transmission devices (antennas) 201 and 202, while a data stream receiver 100 typically has a receiving device 109.
  • the transit times on the data transmission paths 10a-10lc which transmit the data stream 102 are different.
  • the delay time is typically 30 ⁇ s, which corresponds to a distance difference of up to 9 km.
  • This "worst-case” delay time is specified by test cases in the 3GPP standard.
  • FIG. 2 schematically shows the structure of a pilot channel with a predefined pilot sequence.
  • a data stream is constructed from individual data frames 203a ... 203i ... 203N.
  • Each data frame is divided into individual slots 204a ... 204i ... 204n.
  • the first symbols indicated for a first antenna 1 or a first transmission device 201 under the reference symbol 205 or for a second antenna 2 or a second transmission device 202 under the reference symbol 206 for a specific slot form a first pilot sequence signal 303a or a second pilot sequence signal 303b.
  • a symbol is made up of 256 chips, one chip representing a smallest digital unit.
  • a time slot T ⁇ Ch ii t z consists of 2560 chips, with 20 bits being provided for each slot 204a-204n if 2 bits are provided per symbol - for real and imaginary parts, ie (1 + j) ,
  • a chip rate of 3.84 Mchip / s results.
  • the data stream is now sampled at at least twice the chip rate (Nyquist sampling frequency), ie at 7.68 ⁇ 10 6 sampling steps per second.
  • a correlation length N COrr is advantageously set to a multiple of the symbol length (xl, x2, x4 ).
  • the quantity L given in the above equation thus denotes a maximum shift in the formation of the correlation functions. onen, ie n runs from 0, 1, 2 ... Ll. If L is set to 240, there is a delay time of 31.25 ⁇ s at Nyquist sampling frequency, which is also sufficient for the "worst case".
  • Transmitters 201 and 202 have different correlation functions as a function of n, the sum of the squares of the magnitudes of the individual correlation functions being formed to determine an overall energy delay profile.
  • Equation (1) to (3) the received complex signal is denoted in each case by r (n), while C (i) is the complex product code.
  • the energy delay profile PDP thus results from the sum of the squares of the amounts according to equation (3) and is referred to as PDP (n).
  • the energy delay profile determination can be averaged over several blocks of a correlation length N C orr.
  • N avg denotes a number of blocks over which to average.
  • This variable N avg can vary depending on the network conditions and can be any accept a numerical value, which is, however, usefully limited to a maximum value, for example 16.
  • the correlation length N corr and thus the number of averages N avg can now be changed without having to change or adapt hardware configurations .
  • FIG. 3 shows a block diagram of a device for determining energy delay profiles of a data stream 102 according to a preferred exemplary embodiment of the present invention.
  • a correlation device 103 which contains a partial correlation device 103a and an input buffer memory 304, correlation functions or partial correlation functions are formed over a sub-symbol length of, for example, 128 chips, the correlation results (real and imaginary part) being processed in a processing device 105.
  • the received receive signal 301 is fed to the input buffer memory 304.
  • the processing device 105 receives a determination device 104, with which the energy delay profile (result of equation 3) of at least one data transmission path is determined.
  • the processing device 105 also contains intermediate storage devices 105a and post-processing devices 106.
  • the functionality of the post-processing devices 106 corresponds to the general state of the art and is therefore not described in more detail below.
  • a partial correlation is carried out for a sub-symbol length (less than 256 chips), the sub-symbol length preferably being 128 chips.
  • the input buffer memory 304 shown in FIG. 3 therefore only has to temporarily store 128 chips for the correlation and is partially independent of the total correlation length
  • FIG. 4 shows an exemplary embodiment according to the invention on the basis of a flow chart for forming a correlation function of the partial correlations.
  • partial correlations are then accumulated, with complex partial results (I for real part and Q for imaginary part) being buffered with the corresponding sampling rate, rather the buffer memory 107 for the I component and 108 for the Q component (FIG. 3).
  • the partial correlations are reusable, so that a partial correlation is provided only for equation (1) above, i.e. The partial correlation is only implemented for the first antenna 1, which advantageously reduces the complexity of the hardware design.
  • a coherent accumulation of the partial correlations is then carried out in order to obtain results corresponding to equations (1) and (2).
  • an energy delay profile can be created with equation (3)
  • step S1 a coherent correlation over 128 chips is started, while in step S2 two coherent accumulations take place over 128 chips each.
  • step S3 the coherent accumulation of the second block has ended.
  • step S11 the coherent correlation begins with 128 chips and ends in step S12 for the first block with 128 chips. Then the coherent correlation is started in step S21 for the second block and ended in step S22 for the second block. The coherent correlation also takes place in the third block (steps S31 and S32).
  • the accumulation of the energy delay profiles takes place in the Steps S22 and S32 take place.
  • the final PDP avg (n) is available after the accumulation in step S32.
  • the present invention thus provides a method of reducing the correlation length to a sub-symbol length instead of a total correlation length N corr . This advantageously leads to a reduction in the size of the input buffer memory 304 and simplifies the circuit design.
  • the partial correlation has a predefinable one
  • Partial correlation length independent of a total correlation length N corr Partial correlation length independent of a total correlation length N corr .
  • the overall architecture of the circuit structure also acts independently of N corr and Nagr with regard to a memory size, which advantageously means that the circuit arrangement is flexibly designed for parameter changes.
  • the invention of the processing device 105 can also be applied to VLIW (very long instruction word) based DSP cores.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé pour déterminer des profils puissance-temps de propagation d'un flux de données (102) par l'intermédiaire d'au moins un chemin de transmission de données (101). Selon ce procédé, le flux de données (102) est transmis par un ou deux dispositifs émetteurs (201, 202), le flux de données (102) transmis est reçu au moyen d'un récepteur de flux de données (100) de façon à permettre l'obtention d'un signal de réception (301), une première fonction de corrélation entre le signal de réception (301) et un premier signal de séquence pilote (303a) et une seconde fonction de corrélation entre le signal de réception (301) et un second signal de séquence pilote (303b) sont formées dans un dispositif de corrélation (103) et un dispositif de détermination (104), ces fonctions de corrélation étant divisées en sous-fonctions de corrélation d'une longueur prédéterminable, puis un profil puissance-temps de propagation (300) d'au moins un chemin de transmission de données (101) est déterminé au moyen de la première et de la seconde fonction de corrélation dans le dispositif de détermination (104).
PCT/EP2004/000693 2003-01-31 2004-01-27 Procede et systeme pour determiner des profils puissance-temps de propagation lors de la transmission d'un flux de donnees par l'intermediaire de chemins multiples de transmission de donnees Ceased WO2004068735A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10303912.0 2003-01-31
DE2003103912 DE10303912B4 (de) 2003-01-31 2003-01-31 Verfahren und Vorrichtung zur Bestimmung von Energieverzögerungsprofilen bei einer Datenstrombübertragung über mehrfache Datenübertragungspfade

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WO2004068735A1 true WO2004068735A1 (fr) 2004-08-12

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Citations (3)

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EP1143632A2 (fr) * 2000-04-06 2001-10-10 NTT DoCoMo, Inc. Appareil et procédé pour mésurer la qualité de communication dans
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FI98018C (fi) * 1994-08-18 1997-03-25 Nokia Mobile Phones Ltd Menetelmä ja laite radiokanavan impulssivasteen mittaamiseksi
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WO1999063677A1 (fr) * 1998-05-29 1999-12-09 Telefonaktiebolaget Lm Ericsson (Publ) Systeme de determination du delai de propagation multivoie au moyen de symboles pilotes a insertion periodique
EP1143632A2 (fr) * 2000-04-06 2001-10-10 NTT DoCoMo, Inc. Appareil et procédé pour mésurer la qualité de communication dans
WO2002009304A1 (fr) * 2000-07-26 2002-01-31 Motorola Inc Estimation des interferences dans un systeme de communications

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DE10303912A1 (de) 2004-08-19

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