EP2817886A1 - Dispositif auto-configurable d'entrelacement/desentrelacement de trames de donnees - Google Patents
Dispositif auto-configurable d'entrelacement/desentrelacement de trames de donneesInfo
- Publication number
- EP2817886A1 EP2817886A1 EP13711578.8A EP13711578A EP2817886A1 EP 2817886 A1 EP2817886 A1 EP 2817886A1 EP 13711578 A EP13711578 A EP 13711578A EP 2817886 A1 EP2817886 A1 EP 2817886A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- memory
- interleaving
- interconnection network
- memory banks
- 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
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/06—Addressing a physical block of locations, e.g. base addressing, module addressing, memory dedication
- G06F12/0607—Interleaved addressing
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
- H03M13/276—Interleaving address generation
- H03M13/2764—Circuits therefore
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
- G06F13/28—Handling requests for interconnection or transfer for access to input/output bus using burst mode transfer, e.g. direct memory access DMA, cycle steal
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
- H03M13/2771—Internal interleaver for turbo codes
- H03M13/2775—Contention or collision free turbo code internal interleaver
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
- H03M13/2789—Interleaver providing variable interleaving, e.g. variable block sizes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/65—Purpose and implementation aspects
- H03M13/6508—Flexibility, adaptability, parametrability and configurability of the implementation
- H03M13/6513—Support of multiple code types, e.g. unified decoder for LDPC and turbo codes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/65—Purpose and implementation aspects
- H03M13/6508—Flexibility, adaptability, parametrability and configurability of the implementation
- H03M13/6519—Support of multiple transmission or communication standards
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/65—Purpose and implementation aspects
- H03M13/6569—Implementation on processors, e.g. DSPs, or software implementations
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/25—Using a specific main memory architecture
- G06F2212/251—Local memory within processor subsystem
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
- H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
- H03M13/11—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
- H03M13/1102—Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
Definitions
- the present invention relates to a device for interleaving / deinterleaving digital data.
- the invention is in the field of high-speed data transmission, for example audio and / or video signals.
- a particularly interesting application of the invention relates to data interleaving and / or deinterleaving for the coding and decoding of error correcting codes, in particular LDPC codes (for Low Density Parity-Check Code in English) or Turbo -codes State of the art
- LDPC error correcting codes and Turbo codes are well known in the state of the art.
- These coding and decoding techniques are based on an iterative processing of the data, the latter being mixed or interleaved, at each processing step, until a complete decorrelation of the errors that can be conveyed is obtained.
- These techniques use an interleaver that performs iterative permutation of the symbols of an input code.
- FIG. 1 shows the architecture of a known interleaving or deinterleaving device.
- This device is intended to interleave or deinterlace data delivered by n processing elements, referenced P 0 to P n -i, arranged in parallel, said data representing symbols.
- the interleaving or deinterleaving device comprises a set of m memory banks, referenced B 0 to B m- i, arranged in parallel and intended to store data from or to the n treatment elements and an interconnection network INT which is interposed between the processing elements and the memory banks for switching at any time the data of the processing elements to the memory banks or vice versa.
- the data stored in the memory banks are the operands and the results of the processing operations performed in the processing elements.
- the data to be stored in n of the memory banks are conventionally generated simultaneously by the n processing elements.
- the number m of memory banks is greater than or equal to the number n of processing elements. Otherwise, the data must be provided by subassembly whose size is less than or equal to the number of memory banks.
- the interconnection network INT and the memory banks are controlled by a dedicated control unit CTRL. More specifically, the control unit is responsible for providing, at any time, a control word to the interconnection network and addressing and control sequences to the memory banks to access the read or write data.
- the control unit conventionally comprises a plurality of ROM (Read-Only Memory) type of control memories and a control circuit for reading the contents of these memories.
- ROM Read-Only Memory
- the control unit conventionally comprises at least one control memory for storing the control words of the interconnection network and a control memory for storing the addressing and control sequences of the memory banks. These sequences and these control words are a function of the interleaving or deinterleaving rule to be applied, the number n of processing elements, the number m of memory banks, the structure of the interconnection network and the size of the interconnections. data frames (number of symbols in the frame) treat.
- the first four parameters namely the interleaving or deinterleaving rule, the numbers n and m and the structure of the interconnection network, do not vary and are fixed by the equipment comprising the interleaver or deinterlacing.
- the interleaving or deinterleaving rule is imposed by the transmission standard supported by the equipment.
- the equipment must, however, be able to handle several frame sizes for this standard, typically one hundred or more frame sizes.
- Each of these frame sizes is then associated with a particular mode of operation of the interleaving or deinterleaving device.
- the control unit of the interleaving or deinterleaving device generally comprises two control memories for each of the operating modes, namely a so-called network memory for storing the words of control of the interconnection network and a so-called access control memory for storing the addressing and control sequences of the memory banks for the operating mode in question.
- the control unit of the device comprises two control memories for each mode of operation, the content of these memories being generally calculated offline by a memory placement algorithm before being stored there.
- Another problem related to the implementation of this type of interleaving architecture concerns the access conflicts with the memory banks B 0 to
- a first family of techniques is based on the definition of an interleaving rule based on one or more permutation (s) regular (s), for example circular (s) to implement an interleaver having a high degree of parallelism with performance equivalent or better than known interleavers, while reducing the complexity of the architecture of the interconnection network, especially for very high speed applications.
- This type of solution also has the advantage of reducing the cost of the control unit by minimizing the total number of control memories used.
- a first technique belonging to this family and called "turbo-code wheeled" is described in detail in the document FR 2 838 581. The disadvantage of this technique is that it is based on the definition of an interleaving rule which is a priori not compliant with a communication standard.
- a second family of techniques proposes to add memories in the interconnection network in order to ensure a data delay in the event of a conflict situation.
- this type of approach has the disadvantage of increasing the latency of the circuit and increasing the complexity of the interconnection network.
- An example of such a technique is described in N. Wehn's SoC-Network for Interleaving in Wireless Communications, MPSoC, 2004.
- a third family of techniques consists of storing the data in the memory banks in order to avoid conflicts. This approach consists of identifying the data that is intended to be consumed or produced at the same time in an assignment matrix. Although this family allows to find a data assignment in the memory banks that does not generate conflict regardless of the interleaving rule, however, it has a number of disadvantages. Indeed, it does not generate a memory access that is simple to implement using simple components in the interconnection network. Furthermore, this family requires the use of two control memories by operating mode for storing natural access orders and interleaved, which further increases the cost of the device.
- a first example of a technique belonging to this family is described in the article "Mapping Interleaving Laws to Parallel Turbo-decoder Architectures" by A.Tarable, S.Benedetto and G.Montorsi, IEEE Volume 8, March 2004.
- the proposed approach consists in making a first na ⁇ ve assignment of data in the memory banks, without generating a conflict and then assigning a memory bank to the unassigned data by correcting the conflicts using a method called "simulated annealing" or “Iterative refinement".
- the simulated annealing algorithm is relatively complex to implement and does not allow to determine, a priori, the time required to obtain the solution although this time limit is limited.
- An object of the invention is to overcome all or part of the disadvantages and limitations of the state of the art mentioned above.
- an object of the invention is to propose a device for interleaving or de-interleaving digital data which is able to implement, without memory access conflict, the rule of interleaving or deinterleaving any type of standard. communication and in which the control unit has a memory space and a reduced number of control memories.
- Another object of the invention is to propose a device for interleaving or de-interleaving digital data having a reduced cost control unit.
- the memory placement algorithm is executed on the fly by the interleaver or deinterleaver.
- the invention relates to a device for interleaving or deinterleaving frames of digital data delivered by n processing elements arranged in parallel, n being a natural integer greater than 1, said device comprising
- n memory banks for storing data from or to said processing elements, where m is a natural integer greater than 1,
- control unit comprising a control memory in which control words of the interconnection network are stored, and addressing and control sequences intended to control the memory banks, said control words and said addressing sequences and based on an interleaving or de-interleaving rule to be applied, the size of the digital data frames, the numbers m and n and the interconnection network, and a control circuit for controlling the interconnection network and the memory banks with the control words and the addressing and control sequences stored in said control memory, characterized in that the control unit further comprises a calculation circuit capable of generating on-line words of control.
- control and addressing and control sequences guaranteeing conflict-free memory access according to the interleaving rule to be applied, the frame size s of digital data, the number n of processing units, the number m of memory banks and the interconnection network, said control circuit being able to write the control words and the addressing and control sequences generated by said calculation circuit in said control memory.
- the computing circuit executes a memory placement algorithm that guarantees a non-conflicting memory access whenever at least one of the following parameters changes:
- control circuit The results are placed in the control memory by the control circuit.
- control memory it is no longer necessary to have a control memory for each of the possible modes of operation of the device, which contributes to reducing the cost of the device.
- the memory placement algorithm is no longer executed offline but online.
- control memory comprises a so-called network memory for storing the control words of the interconnection network and a memory, called access control memory, for storing the addressing and signaling sequences. control of the memory banks.
- the network memory and the access control memory are volatile memories.
- the device of the invention further comprises at least one computing memory for storing intermediate data generated by said calculation circuit.
- This computation memory is for example a memory internal to the calculation circuit or to the control unit. According to a particular embodiment, said computation memory is a memory portion of said memory banks.
- the invention also relates to a device for encoding or decoding digital data frames comprising n processing elements arranged in parallel, n being a natural integer greater than 1, and an interleaver or deinterleaver as defined previously to interleave or deinterlace data frames produced processing elements.
- FIG. 1 already described, shows the block diagram of an interleaver or deinterleaver of the prior art
- Figures 2 and 3 already described, show diagrams illustrating the collision problems with the device of Figure 1;
- Figure 4 shows the block diagram of an interleaver or deinterleaver according to the invention.
- the control unit CTRL of the interleaving or deinterleaving device according to the invention is described with reference to FIG. 4.
- the control unit CTRL comprises a network memory M1 in which control words of the network D are stored. interconnection and an M2 access control memory in which are stored addressing and control sequences for controlling access to the memory banks.
- the memories M1 and M2 are read and write controlled by the control circuit CC.
- the calculation circuit CAL generates control words and addressing and control sequences guaranteeing read and write access without conflict to the memory banks B 0 to B m- as a function of internal parameters which are not likely to be modified, such as the interleaving rule to be applied, the number n of processing elements P, working in parallel, the structure of the interconnection network (butterflies, shift registers, Bénippo network, ...) and external parameters such as the size of the frames to be processed.
- the calculation circuit CAL executes on the fly a memory placement algorithm guaranteeing a conflict-free access according to said internal and external parameters and the results of this execution are stored in the memories M1 and M2. This algorithm is executed whenever any of the internal or external parameters is changed.
- the interleaving rule to be applied is that imposed by the communication standard of the terminal, the interconnection network is that of the terminal and the number of terminals.
- processing elements working in parallel is generally the number n of processing elements P 0 to P n -i contained in the terminal to perform the coding or decoding of the frames.
- the only parameter that can vary is the size of the frames.
- the memory placement algorithm is then executed each time the frame size changes. This example is illustrated in Figure 4.
- the terminal is capable of operating according to a so-called degraded operating mode in which only a part of the n processing elements are working, for example n / 2, the other processing elements being switched off or on standby to limit the consumption. of the terminal.
- the memory placement algorithm is executed each time the frame size changes or a degraded operating mode is changed.
- the memory placement algorithm is executed each time one of the internal or external parameters is changed.
- This algorithm is for example the algorithm of low complexity described in one of the following three documents:
- the intermediate data are stored in internal memories of the control unit CTRL or possibly in the memory banks.
- the control words and the addressing and control sequences generated by the calculation circuit are placed in the memories M1 and M2 by the control circuit CC.
- the memories M1 and M2 are two portions of the same control memory.
- the calculation circuit CAL is capable of generating the control words and the addressing and control sequences for all the modes of operation of the new communication standards, for example LTE or WIMAX, if it is provided with the interleaving rule at apply, the number of processing elements P, working in parallel, the structure of the interconnection network to be controlled and the size of the frames.
- the algorithm is re-executed each time one of these parameters is changed. All modes of operation of a communication standard can be implemented without having to use tens or even hundreds of ROMs in the device.
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- Probability & Statistics with Applications (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Error Detection And Correction (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1251688A FR2987527B1 (fr) | 2012-02-23 | 2012-02-23 | Dispositif auto-configurable d'entrelacement/desentrelacement de trames de donnees |
| PCT/EP2013/053613 WO2013124449A1 (fr) | 2012-02-23 | 2013-02-22 | Dispositif auto-configurable d'entrelacement/desentrelacement de trames de donnees |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2817886A1 true EP2817886A1 (fr) | 2014-12-31 |
Family
ID=47988889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13711578.8A Ceased EP2817886A1 (fr) | 2012-02-23 | 2013-02-22 | Dispositif auto-configurable d'entrelacement/desentrelacement de trames de donnees |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9971684B2 (fr) |
| EP (1) | EP2817886A1 (fr) |
| FR (1) | FR2987527B1 (fr) |
| WO (1) | WO2013124449A1 (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9454313B2 (en) | 2014-06-10 | 2016-09-27 | Arm Limited | Dynamic selection of memory management algorithm |
| US9875195B2 (en) | 2014-08-14 | 2018-01-23 | Advanced Micro Devices, Inc. | Data distribution among multiple managed memories |
| EP3878102B1 (fr) * | 2018-11-07 | 2024-03-06 | Telefonaktiebolaget LM Ericsson (publ) | Implémentation optimisée du (dés)entrelacement pour 3gpp nouvelle radio |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1850486A1 (fr) * | 2005-02-03 | 2007-10-31 | Matsushita Electric Industrial Co., Ltd. | Entrelaceur parallele, desentrelaceur parallele et procede d'entrelacement |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2675970B1 (fr) | 1991-04-23 | 1993-08-06 | France Telecom | Procede de codage convolutif correcteur d'erreurs pseudo-systematique, procede de decodage et dispositifs correspondants. |
| FR2838581B1 (fr) | 2002-04-16 | 2005-07-08 | Universit De Bretagne Sud | Procede de codage et/ou de decodage de codes correcteurs d'erreurs, dispositifs et signal correspondants |
| US7454570B2 (en) * | 2004-12-07 | 2008-11-18 | International Business Machines Corporation | Efficient memory update process for on-the-fly instruction translation for well behaved applications executing on a weakly-ordered processor |
| FR2915641B1 (fr) * | 2007-04-30 | 2009-08-07 | St Microelectronics Sa | Procede et dispositif d'entrelacement de donnees |
| EP2210345A2 (fr) * | 2007-10-02 | 2010-07-28 | Imec | Architecture asip (processeur d'ensembles d'instructions spécifique à une application) permettant de décoder au moins deux procédés de décodage |
| FR2931968B1 (fr) * | 2008-06-02 | 2012-11-30 | Alcatel Lucent | Procede et equipement de stockage de donnees en ligne |
| TWI381653B (zh) * | 2009-09-11 | 2013-01-01 | Ind Tech Res Inst | 二階重排多項式交織器位址產生裝置與方法 |
-
2012
- 2012-02-23 FR FR1251688A patent/FR2987527B1/fr not_active Expired - Fee Related
-
2013
- 2013-02-22 US US14/380,554 patent/US9971684B2/en not_active Expired - Fee Related
- 2013-02-22 WO PCT/EP2013/053613 patent/WO2013124449A1/fr not_active Ceased
- 2013-02-22 EP EP13711578.8A patent/EP2817886A1/fr not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1850486A1 (fr) * | 2005-02-03 | 2007-10-31 | Matsushita Electric Industrial Co., Ltd. | Entrelaceur parallele, desentrelaceur parallele et procede d'entrelacement |
Non-Patent Citations (2)
| Title |
|---|
| See also references of WO2013124449A1 * |
| ZHENZHI WU ET AL: "FPGA implementation of a multi-algorithm parallel FEC for SDR platforms", 2014 24TH INTERNATIONAL CONFERENCE ON FIELD PROGRAMMABLE LOGIC AND APPLICATIONS (FPL), TECHNICAL UNIVERSITY OF MUNICH (TUM), 2 September 2014 (2014-09-02), pages 1 - 6, XP032662531, DOI: 10.1109/FPL.2014.6927446 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2987527A1 (fr) | 2013-08-30 |
| WO2013124449A1 (fr) | 2013-08-29 |
| US20150301940A1 (en) | 2015-10-22 |
| US9971684B2 (en) | 2018-05-15 |
| FR2987527B1 (fr) | 2014-02-21 |
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