WO2001035566A2 - Procede et dispositif de transmission de donnees - Google Patents

Procede et dispositif de transmission de donnees Download PDF

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Publication number
WO2001035566A2
WO2001035566A2 PCT/DE2000/003341 DE0003341W WO0135566A2 WO 2001035566 A2 WO2001035566 A2 WO 2001035566A2 DE 0003341 W DE0003341 W DE 0003341W WO 0135566 A2 WO0135566 A2 WO 0135566A2
Authority
WO
WIPO (PCT)
Prior art keywords
bit
bit data
bits
data block
value
Prior art date
Application number
PCT/DE2000/003341
Other languages
German (de)
English (en)
Other versions
WO2001035566A3 (fr
Inventor
Josef Laumen
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2001035566A2 publication Critical patent/WO2001035566A2/fr
Publication of WO2001035566A3 publication Critical patent/WO2001035566A3/fr

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Classifications

    • 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
    • H04L1/0045—Arrangements at the receiver end
    • 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
    • H04L1/0067—Rate matching
    • H04L1/0068—Rate matching by puncturing
    • 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

Definitions

  • the present invention relates to a data transmission method in which digital information signal is transmitted over a physical channel between a transmitter and a receiver, and a corresponding data transmission device.
  • UMTS Universal Mobile Telephone System
  • channel coding is carried out either using convolutional codes or turbo codes and is usually decoded at the receiver using a Viterbi or a Maximum A Posteriori (MAP) decoder.
  • MAP Maximum A Posteriori
  • FIG. 3 is a schematic illustration of a data transmission device in which the method according to the invention can be used.
  • S denotes a transmitter, K a physical channel (e.g. a radio channel), E a receiver, B1 and B2 bit data blocks to be transmitted, Bl 'and B2' bit data blocks transmitted.
  • 50 is a channel transmission device. The units necessary for their formation are shown in the respective bit data blocks B1 and B1.
  • reference numeral 10 designates an information signal input device for inputting a digital information signal, 20 a channel encoder, 30 an interleaving or scrambling unit and 40 a rate adaptation device.
  • reference numeral 10 'de denotes an information signal output device for outputting the transmitted digital information signal, 20' a channel decoder, 30 'a deinterleaving or design unit and 40' a rate adaptation device.
  • the common algorithm for adapting or adapting the data rate with devices 40 and 40 ' provides for puncturing or repetition of individual bits (unequal repetition) in the data stream.
  • FIG. 4 is a schematic illustration of the common puncture and repetition rate adjustment techniques.
  • P denotes a puncturing which forms NM bits from N bits and R a repetition which forms N + M bits from N bits.
  • T 0 is a normalization time interval, for example 1 s.
  • the decoder 30 ' in particular in the form of a convolution or turbo decoder, takes place when the rate adaptation is undone by means of the rate adaptation device 40'. Between the two devices, there is only one deinterleaving unit 30 'according to the structure in the transmitter S for descrambling the position of the bits in the data block B1', B2 ', etc. In the case of puncturing P, there is no information about the punctured bits in the receiver E. This "zero information" must be communicated to the following convolution / turbo decoder 20 ' . How this "zero information" is actually realized is clearly predetermined by the convolution / turbo decoder 20 '.
  • the idea on which the present invention is based is that redundancy bits with repetition bit values used in the transmission are not simply discarded, but are evaluated together with the corresponding transmission bits.
  • the invention shows how a single meaningful value is found in rate dematching from two or more different received bit values of the same original bit, so that the overall error protection of the transmission system is significantly improved compared to the trivial solution.
  • the data transmission method according to the invention with the features of claim 1 and the data transmission device according to claim 10 have the particular advantage that the bandwidth efficiency and / or capacity of the channel of this data transmission system (at least in mobile radio systems) is also improved by improving the error protection properties of the system .
  • the transmission power of a signal on the air interface can be reduced without influencing the reception quality. This enables an operator of cellular networks to increase the number of users of his network, i.e. to increase the channel capacity of the mobile network.
  • certain pairs of bits and repetition bits are transmitted, the maximum value of the amount in the case of a pair consisting of a bit and a corresponding repetition bit of both received bit values is determined and this is transferred to the fourth bit data block, while the "smaller" received bit value is rejected.
  • certain pairs of bits and repetition bits are transmitted, the arithmetic mean of both reception bit values being determined in the case of a pair of reception bit values consisting of a bit and a corresponding repetition bit, and this is adopted in the fourth bit data block.
  • certain pairs of bits and repetition bits are transmitted, wherein in the case of a pair consisting of bit “a” and a corresponding repetition bit “b”, the quadratic mean value ⁇ yes 2 + b 2 ) / 2 of both receive bit values is first determined to adjust the amount of the value to be transferred to the fourth bit data block and that the sign of the value to be transferred to the fourth bit data block is chosen as the sign of the largest received bit value.
  • certain pairs of bits and repetition bits are transmitted, with in the case of a pair consisting of a bit “a” and a corresponding repetition bit “b” initially an average of any order W ( ⁇ a ⁇ + ⁇ b) / N of both Emp ⁇
  • catch bit values is determined, where
  • and denote the amount of the respective received bit value and N 3, 4, 5, ... to determine the amount of the value to be transferred to the fourth bit data block and that the sign to be transferred to the fourth bit data block as the sign of the amount largest receive bit value is selected.
  • certain pairs of bits and repetition bits are transmitted, wherein in the case of a pair consisting of a bit and a corresponding repetition bit, an average value of any order W (
  • ⁇ j ⁇ ⁇ b ⁇ ) IN is first determined, whereby and denote the amount of the respective received bit value, a is the larger received bit value and N 3, 4, 5, ..., the amount of the value to be transferred to the fourth bit data block increasing to - (
  • Receiving bit values are different, and that the sign of the value to be transferred to the fourth bit data block is selected in accordance with the sign of the largest received bit value a.
  • the bits of the first bit data block are encoded before the formation of the second bit data block and the bits of the fourth bit data block are decoded accordingly.
  • the bits of the first bit data block are scrambled before the formation of the second bit data block and the bits of the third bit data block are descrambled accordingly.
  • the transmission is carried out in analog form, preferably via a radio link.
  • FIG. 1 shows a schematic illustration of an embodiment of the data transmission method according to the invention
  • FIG. 2 shows a graphic representation of the frame error rate or bit error rate in the case of the according to the procedure and the trivial procedure
  • Figure 3 is a schematic representation of a data transmission device in which the inventive method is applicable.
  • FIG 4 is a schematic representation of the usual
  • Rate adjustment techniques puncturing and re-petition.
  • FIG. 1 is a schematic illustration of an embodiment of the data transmission method according to the invention.
  • SlOO to S700 denote process steps.
  • the present embodiment of the data transmission method according to the invention can run on the data transmission system illustrated in FIG. 3. Therefore, reference is made to the reference numerals of FIG. 3 in terms of apparatus.
  • step S 100 the digital information signal is provided in the form of a first bit data via the information signal input device 10 in the transmitter S. blocks with a first bit data rate, for example 10 information bits, including possible taiibits for the subsequent channel encoder 20.
  • step S200 coding is carried out at rate 1/3 of the first bit data block by the encoder 20 in the transmitter S.
  • the 10 information bits become 30 coded bits.
  • step S200 scrambling takes place by means of the interleaving unit 30.
  • a second bit data block B1 is formed from the bits of the coded first bit data block and repeat bits, with every third bit being repeated, at a second bit data rate via the rate adaptation device 40 in the transmitter S.
  • a second bit data block B2 with 40 bits.
  • step S400 the second bit data block B1 is transmitted via the physical channel K at the second bit data rate from the transmitter S to the receiver E.
  • step S500 a third bit data block is formed from the bits of the transmitted second bit data block B1 ', B2' at the second bit data rate in the receiver E by means of the rate adaptation device 40 '.
  • a fourth bit data block is formed in the receiver E by means of the rate adaptation device 40 ′ from the bits of the third bit data block with the Most bit data rate, in the case of each pair consisting of a bit and a corresponding repetition bit the maximum value of the amount of both receive bit values is determined and this is transferred to the fourth bit data block, while the amount of the "smaller" receive bit value is discarded.
  • every third and fourth bit of the 40 bits received is combined in this way in order to return to a number of 30 coded bits.
  • step S700 a descrambling takes place by means of the deinterleaving unit 30 'and then a decoding of the first bit data block by the decoder 20' in the receiver E.
  • the 30 coded bits in turn become the 10 information bits which were previously sent in the transmitter S.
  • information with a source data rate of 31.6 kbit / s is to be transmitted via a UMTS system, error protection being ensured by means of a convolution code of the rate 1/3.
  • the source data flow is divided into data frames with a length of 10 ms, ie 316 information bits are allocated to each frame.
  • CRC Cyclic Redundancy Coding
  • These 332 bits are now additionally appended with 8 tail bits in order to reset the convolutional encoder to a zero state after coding a data block (reset) and thus, if possible to allow reliable operation of a Viterbi decoder 20 'on the receiver side.
  • the convolutional code rate 1/3
  • these 340 bits are coded to 1020 bits, ie the data rate of the coded bits is 102 kbit / s. This rate is far from the next allowed channel data rates (64 kbps or 128 kbps).
  • a rate adjustment to the closest rate i.e. to a channel data rate of 128 kbit / s (1280 bits per 10 ms) is therefore necessary.
  • 260 of the 1020 bits are now repeated in order to fill up the 10 ms long frames to 1280 bits.
  • 1020 received bit values are then forwarded to the subsequent Viterbi decoder 20 '.
  • FIG. 2 is a graphic representation of the frame error rate or bit error rate in the method according to the invention and in the trivial method.
  • Bit error rate is shown and on the y-axis the bit energy Eb normalized to the noise power density NO.
  • Curve A with the open triangles denotes the fra error rate in the trivial case
  • curve B with the open squares denotes the frame error rate in the case according to the invention
  • curve C with the closed triangles denotes the bit error rate Rate in the trivial case
  • curve D with the closed squares denotes the bit error rate in the case according to the invention.
  • more than one repetition bit can be provided for certain bit values.
  • the invention is also not restricted to UMTS systems. Furthermore, coding / decoding or scrambling / descrambling are not absolutely necessary.

Abstract

Procédé de transmission de données selon lequel un signal d'information numérique est transmis par un canal physique (K) entre un émetteur (S) et un récepteur (E). Ledit procédé consiste à préparer, dans l'émetteur (S), le signal d'information numérique sous forme d'au moins un premier bloc de données en bits à premier débit binaire, à former, dans l'émetteur (S), un deuxième bloc (B1, B2) de données en bits, à deuxième débit binaire, à partir des bits du premier bloc de données en bits et d'un ou plusieurs bits de répétition, à transmettre le deuxième bloc (B1, B2) de données en bits par le canal physique (K) au deuxième débit binaire de l'émetteur (S) au récepteur (E), à former, dans le récepteur (E), un troisième bloc de données en bits au deuxième débit binaire à partir des bits du deuxième bloc (B1', B2') transmis et à former un quatrième bloc de données en bits au premier débit binaire à partir des bits du troisième bloc de données en bits. En cas de groupe, constitué par un bit et un ou plusieurs bits de répétition correspondants, de valeurs de bits de réception, ledit procédé permet de décider, selon un algorithme prédéterminé et avec prise en compte d'au moins deux valeurs de bit de réception, la valeur de bit qui sera reprise dans le quatrième bloc de données en bits.
PCT/DE2000/003341 1999-11-10 2000-09-26 Procede et dispositif de transmission de donnees WO2001035566A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19953894.8A DE19953894B4 (de) 1999-11-10 1999-11-10 Datenübertragungsverfahren und -vorrichtung
DE19953894.8 1999-11-10

Publications (2)

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WO2001035566A2 true WO2001035566A2 (fr) 2001-05-17
WO2001035566A3 WO2001035566A3 (fr) 2001-11-22

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5581575A (en) * 1993-11-01 1996-12-03 Qualcomm Incorporated Method and apparatus for transmission of variable rate digital data
US5909434A (en) * 1996-05-31 1999-06-01 Qualcomm Incorporated Bright and burst mode signaling data transmission in an adjustable rate wireless communication system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9814960D0 (en) 1998-07-10 1998-09-09 Koninkl Philips Electronics Nv Coding device and communication system using the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5581575A (en) * 1993-11-01 1996-12-03 Qualcomm Incorporated Method and apparatus for transmission of variable rate digital data
US5909434A (en) * 1996-05-31 1999-06-01 Qualcomm Incorporated Bright and burst mode signaling data transmission in an adjustable rate wireless communication system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
LAY R: "ERROR CORRECTION IN HIGH FREQUENCY AUTOMATIC LINK ESTABLISHMENT RADIOS WITH AND WITHOUT LINK PROTECTION" ANNUAL MILITARY COMMUNICATIONS CONFERENCE,US,NEW YORK, IEEE, Bd. 15TH, 22. Oktober 1996 (1996-10-22), Seiten 696-699, XP000697362 ISBN: 0-7803-3683-6 *
SHEUNG C N ET AL: "Rate determination algorithms in IS-95 forward traffic channels" IEEE VEHICULAR TECHNOLOGY CONFERENCE, 18. Mai 1998 (1998-05-18), XP002096679 *

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Publication number Publication date
DE19953894B4 (de) 2018-05-09
WO2001035566A3 (fr) 2001-11-22
DE19953894A1 (de) 2001-05-17

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