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164 results on '"Douillard, Catherine"'

1. Optimal Resource Allocation for Full-Duplex IoT Systems Underlaying Cellular Networks with Mutual SIC NOMA

Author

Kilzi, Antoine, Farah, Joumana, Nour, Charbel Abdel, and Douillard, Catherine

Subjects
Computer Science - Information Theory, Electrical Engineering and Systems Science - Signal Processing
Abstract

Device-to-device (D2D) and non-orthogonal multiple access (NOMA) are promising technologies to meet the challenges of the next generations of mobile communications in terms of network density and diversity for internet of things (IoT) services. This paper tackles the problem of maximizing the D2D sum-throughput in an IoT system underlaying a cellular network, through optimal channel and power allocation. NOMA is used to manage the interference between cellular users and full-duplex (FD) IoT devices. To this aim, mutual successive interference cancellation (SIC) conditions are identified to allow simultaneously the removal of the D2D devices interference at the level of the base station and the removal of the cellular users (CU) interference at the level of D2D devices. To optimally solve the joint channel and power allocation (PA) problem, a time-efficient solution of the PA problem in the FD context is elaborated. By means of graphical representation, the complex non-convex PA problem is efficiently solved in constant time complexity. This enables the global optimal resolution by successively solving the separate PA and channel assignment problems. The performance of the proposed strategy is compared against the classical state-of-the-art FD and HD scenarios, where SIC is not applied between CUs and IoT devices. The results show that important gains can be achieved by applying mutual SIC NOMA in the IoT-cellular context, in either HD or FD scenarios., Comment: Under minor revision for future publication in IEEE Internet of Things Journal

Published
2021

2. Resource Allocation in NOMA-based Self-Organizing Networks using Stochastic Multi-Armed Bandits

Author

Youssef, Marie Josepha, Veeravalli, Venugopal V., Farah, Joumana, Nour, Charbel Abdel, and Douillard, Catherine

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

To achieve high data rates and better connectivity in future communication networks, the deployment of different types of access points (APs) is underway. In order to limit human intervention and reduce costs, the APs are expected to be equipped with self-organizing capabilities. Moreover, due to the spectrum crunch, frequency reuse among the deployed APs is inevitable, aggravating the problem of inter-cell interference (ICI). Therefore, ICI mitigation in self-organizing networks (SONs) is commonly identified as a key radio resource management mechanism to enhance performance in future communication networks. With the aim of reducing ICI in a SON, this paper proposes a novel solution for the uncoordinated channel and power allocation problems. Based on the multi-player multi-armed bandit (MAB) framework, the proposed technique does not require any communication or coordination between the APs. The case of varying channel rewards across APs is considered. In contrast to previous work on channel allocation using the MAB framework, APs are permitted to choose multiple channels for transmission. Moreover, non-orthogonal multiple access (NOMA) is used to allow multiple APs to access each channel simultaneously. This results in an MAB model with varying channel rewards, multiple plays and non-zero reward on collision. The proposed algorithm has an expected regret in the order of O(log^2 T ), which is validated by simulation results. Extensive numerical results also reveal that the proposed technique significantly outperforms the well-known upper confidence bound (UCB) algorithm, by achieving more than a twofold increase in the energy efficiency., Comment: Submitted to IEEE Transactions on Communications

Published
2021

3. Power Minimization in Distributed Antenna Systems using Non-Orthogonal Multiple Access and Mutual Successive Interference Cancellation

Author

Farah, Joumana, Kilzi, Antoine, Nour, Charbel Abdel, and Douillard, Catherine

Subjects
Electrical Engineering and Systems Science - Signal Processing, Computer Science - Networking and Internet Architecture
Abstract

This paper introduces new approaches for combining non-orthogonal multiple access with distributed antenna systems. The study targets a minimization of the total transmit power in each cell, under user rate and power multiplexing constraints. Several new suboptimal power allocation techniques are proposed. They are shown to yield very close performance to an optimal power allocation scheme. Also, a new approach based on mutual successive interference cancellation of paired users is proposed. Different techniques are designed for the joint allocation of subcarriers, antennas, and power, with a particular care given to maintain a moderate complexity. The coupling of non-orthogonal multiple access to distributed antenna systems is shown to greatly outperform any other combination of orthogonal/non-orthogonal multiple access schemes with distributed or centralized deployment scenarios., Comment: Paper accepted for publication in IEEE Trans. Vehicular Technology, 14 pages, 5 figures, 2 tables. arXiv admin note: substantial text overlap with arXiv:1710.06619

Published
2018

4. Design of Low-Complexity Convolutional Codes over GF(q)

Author

Klaimi, Rami, Nour, Charbel Abdel, Douillard, Catherine, and Farah, Joumana

Subjects
Computer Science - Information Theory
Abstract

This paper proposes a new family of recursive systematic convolutional codes, defined in the non-binary domain over different Galois fields GF(q) and intended to be used as component codes for the design of non-binary turbo codes. A general framework for the design of the best codes over different GF(q) is described. The designed codes offer better performance than the non-binary convolutional codes found in the literature. They also outperform their binary counterparts when combined with their corresponding QAM modulation or with lower order modulations., Comment: Accepted for publication in IEEE-Globecom 2018 conference

Published
2018

5. Weighted Proportional Fair Scheduling for Downlink Non-Orthogonal Multiple Access

Author

Hojeij, Marie-Rita, Nour, Charbel Abdel, Farah, Joumana, and Douillard, Catherine

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

In this paper, a weighted proportional fair (PF) scheduling method is proposed in the context of non-orthogonal multiple access (NOMA) with successive interference cancellation (SIC) at the receiver side. The new scheme introduces weights that adapt the classical PF metric to the NOMA scenario, improving performance indicators and enabling new services. The distinguishing value of the proposal resides in its ability to improve long term fairness and total system throughput while achieving a high level of fairness in every scheduling slot. Finally, it is shown that the additional complexity caused by the weight calculation has only a limited impact on the overall scheduler complexity while simulation results confirm the claimed improvements making the proposal an appealing alternative for resource allocation in a cellular downlink system., Comment: 11 pages, 8 figures, 2 tables. Submitted paper

Published
2017

6. Power Minimization Techniques in Distributed Base Station Antenna Systems using Non-Orthogonal Multiple Access

Author

Farah, Joumana, Kilzi, Antoine, Nour, Charbel Abdel, and Douillard, Catherine

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

This paper introduces new approaches for combining non-orthogonal multiple access (NOMA) with distributed base station (DBS) deployments. The purpose of the study is to unlock the true potentials of DBS systems in the NOMA context, since all previous works dealing with power minimization in NOMA are performed in the CBS (centralized base station) context. This work targets a minimization of the total transmit power in each cell, under user rate and power multiplexing constraints. Different techniques are designed for the joint allocation of subcarriers, antennas and power, with a particular care given to insuring a moderate complexity. Results show an important gain in the total transmit power obtained by the DBS-NOMA combination, with respect to both DBS-OMA (orthogonal multiple access) and CBS-NOMA deployment scenarios., Comment: Submitted paper

Published
2017

8. A low-complexity 2D signal space diversity solution for future broadcasting systems

Author

Yang, Jianxiao, Kai, Wan, Geller, Benoit, Nour, Charbel Abdel, Rioul, Olivier, and Douillard, Catherine

Subjects
Computer Science - Information Theory
Abstract

-DVB-T2 was the first industrial standard deploying rotated and cyclic Q delayed (RCQD)modulation to improve performance over fading channels. This enablesimportantgains compared toconventional quadrature amplitude modulations(QAM) under severe channel conditions.However, the corresponding demodulation complexitystill prevents its use forwider applications. This paper proposes several rotation angles for different QAM constellations anda corresponding low-complexity detection method. Results show that the proposed solution simplifies both the transmitter and the receiver with often betterperformancethan the proposed angles in DVB-T2. Compared with the lowest complexity demappers currently used in DVB-T2, the proposed solution achieves an additional reduction bymore than 60%. Index Terms- DVB-T2, Rotated and Cyclic Q Delayed (RCQD) Modulations, Signal Space Diversity (SSD), Fading Channel, Quadrature Amplitude Modulations (QAM), Max-Log, ComputationalComplexity.

Published
2015
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9. Antenna, PHY and MAC Design

Author

Schaich, Frank, primary, Douillard, Catherine, additional, Nour, Charbel Abdel, additional, Schellmann, Malte, additional, Svensson, Tommy, additional, Lin, Hao, additional, Miao, Honglei, additional, Wang, Hua, additional, Luo, Jian, additional, Tesanovic, Milos, additional, Pratas, Nuno, additional, Roger, Sandra, additional, and Wild, Thorsten, additional

Published
2018
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22. Low-complexity Computational Units for the Local-SOVA Decoding Algorithm - Under Review, Submitted to PIMRC'20 WS - ETTCOM

Author

Weithoffer, Stefan, Klaimi, Rami, Charbel, Abdel, Wehn, Norbert, Douillard, Catherine, Lab-STICC_IMTA_CACS_IAS, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT), Département Electronique (IMT Atlantique - ELEC), IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Microelectronic Systems Design Research Group, University of Kaiserslautern, Lab-STICC_TB_CACS_IAS, École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), and European Project: 760150,EPIC

Subjects
Local-SOVA, High-radix decoding, [INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, Soft-ouput Viterbi algorithm, Soft-input soft-ouput decoding, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, Turbo codes
Abstract

Under Review, Submitted to IEEE 31st PIMRC'20 - Workshop on Enabling Technologies for TerahertzCommunications (PIMRC'20 WS - ETTCOM); Recently the Local-SOVA algorithm was suggested as an alternative to the max-Log MAP algorithm commonly used for decoding Turbo codes. In this work, we introduce new complexity reductions to the Local-SOVA algorithm, which allow an efficient implementation at a marginal BER penalty of 0.05 dB. Furthermore, we present the first hardware architectures for the computational units of the Local-SOVA algorithm, namely the add-compare select unit and the soft output unit of the Local-SOVA for radix orders 2, 4 and 8 were proposed. We provide place & route implementation results for 28nm technology and demonstrate an area reduction of 46 − 75% for the soft output unit for radix orders ≥ 4 in comparison with the respective max-Log MAP soft output unit. These area reductions compensate for the overhead in the add compare select unit, resulting in overall area saving of around 27 − 46% compared to the max-Log-MAP. These savings simplify the design and implementation of high throughput Turbo decoders.

Published
2020

23. Turbo codes with rate-m/(m + 1) constituent convolutional codes

Author

Douillard, Catherine and Berrou, Claude

Subjects
Wireless technology, Mobile communication systems -- Research, Wireless communication systems -- Research
Abstract

The original turbo codes (TCs), presented in 1993 by Berrou et al., consist of the parallel concatenation of two rate-1/2 binary recursive systematic convolutional (RSC) codes. This paper explains how replacing rate-1/2 binary component codes by rate-m/(m + 1) binary RSC codes can lead to better global performance. The encoding scheme can be designed so that decoding can be achieved closer to the theoretical limit, while showing better performance in the region of low error rates. These results are illustrated with some examples based on double-binary (m = 2) 8-state and 16-state TCs, easily adaptable to a large range of data block sizes and coding rates. The double-binary 8-state code has already been adopted in several telecommunication standards. Index Terms--Iterative decoding, permutation, rate-m/(m + 1) recursive systematic convolutional (RSC) code, tailbiting code, turbo code (TC).

Published
2005

35. Antenna, PHY and MAC Design

Author

Schaich, Frank, primary, Douillard, Catherine, additional, Abdel Nour, Charbel, additional, Schellmann, Malte, additional, Svensson, Tommy, additional, Lin, Hao, additional, Miao, Honglei, additional, Wang, Hua, additional, Luo, Jian, additional, Tesanovic, Milos, additional, Pratas, Nuno, additional, Roger, Sandra, additional, and Wild, Thorsten, additional

Published
2019
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36. Invited Talk: Non-binary turbo codes: design, simplified decoding and comparison with SoA codes

Author

Abdel Nour, Charbel, Douillard, Catherine, Klaimi, Rami, Lab-STICC_IMTA_CACS_IAS, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), Université de Brest (UBO)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université Bretagne Loire (UBL)-Centre National de la Recherche Scientifique (CNRS)-Université de Bretagne Sud (UBS)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Brest (UBO)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université Bretagne Loire (UBL)-Centre National de la Recherche Scientifique (CNRS)-Université de Bretagne Sud (UBS)-École Nationale d'Ingénieurs de Brest (ENIB), Département Electronique (IMT Atlantique - ELEC), IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], [INFO.INFO-IT]Computer Science [cs]/Information Theory [cs.IT], [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

4th and 5th generations of mobile communications systems adopted binary turbo, LDPC and polar codes as forward error correction techniques. However, these codes do not seem to provide full satisfaction with respect to the foreseen requirements in terms of spectral efficiency and reliability of future communications systems (2030 and beyond) expected to support new applications such as holographic communications, autonomous vehicles, tactile internet, etc. A first potential solution was provided a few years ago through the proposal of non-binary LDPC codes. They have proven to outperform their binary counterparts, especially for short frame sizes and/or when coupled with high-order modulations at the cost of a largely increased complexity. Lately, similar studies have started to emerge for turbo codes where the same type of conclusions related to performance and complexity are drawn. In this work, we define a new structure of non-binary turbo codes associated with binary and high-order modulations where all constituent components are investigated and optimized. Moreover, we were able to reduce their decoding complexity through the proposal of a new simplified decoding algorithm. Resulting codes have shown to outperform widely used codes including the ones adopted in latest standards.; International audience

Published
2019

37. Non-binary turbo codes: design, simplified decoding and comparison with SoA codes

Author

Klaimi, Rami, Abdel Nour, Charbel, Douillard, Catherine, Charbel, Abdel, Nour, Catherine, Département Electronique (IMT Atlantique - ELEC), IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Lab-STICC_IMTA_CACS_IAS, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT), European Project: 760150,EPIC, Université de Brest (UBO)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université Bretagne Loire (UBL)-Centre National de la Recherche Scientifique (CNRS)-Université de Bretagne Sud (UBS)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Brest (UBO)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université Bretagne Loire (UBL)-Centre National de la Recherche Scientifique (CNRS)-Université de Bretagne Sud (UBS)-École Nationale d'Ingénieurs de Brest (ENIB)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, [INFO.INFO-IT]Computer Science [cs]/Information Theory [cs.IT], Non-binary codes, Simplified decoding algorithm, Turbo codes, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

Présentation invitée; International audience; 4th and 5th generations of mobile communications systems adopted binary turbo, LDPC and polar codes as forward error correction techniques. However, these codes do not seem to provide full satisfaction with respect to the foreseen requirements in terms of spectral efficiency and reliability of future communications systems (2030 and beyond) expected to support new applications such as holographic communications, autonomous vehicles, tactile internet, etc. A first potential solution was provided a few years ago through the proposal of non-binary LDPC codes. They have proven to outperform their binary counterparts, especially for short frame sizes and/or when coupled with high-order modulations at the cost of a largely increased complexity. Lately, similar studies have started to emerge for turbo codes where the same type of conclusions related to performance and complexity are drawn. In this work, we define a new structure of non-binary turbo codes associated with binary and high-order modulations where all constituent components are investigated and optimized. Moreover, we were able to reduce their decoding complexity through the proposal of a new simplified decoding algorithm. Resulting codes have shown to outperform widely used codes including the ones adopted in latest standards.

Published
2019

38. Channel coding for Tb/s wireless communications: insights into code design and implementation

Author

Douillard, Catherine, Département Electronique (IMT Atlantique - ELEC), IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Lab-STICC_IMTA_CACS_IAS, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), Institut Mines-Télécom [Paris] (IMT)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-École Nationale d'Ingénieurs de Brest (ENIB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-Institut Mines-Télécom [Paris] (IMT)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), and Institut Mines-Télécom [Paris] (IMT)-École Nationale d'Ingénieurs de Brest (ENIB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, [INFO.INFO-IT]Computer Science [cs]/Information Theory [cs.IT], Tb/s wireless communication, Channel coding, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

A presentation on "Channel coding for Tb/s wirelesscommunications: insights into code designand implementation", which was given at theInternational Symposium on Ubiquitous Networking - UNet'19 in Limoges, France

Published
2019

39. New error correcting codes: Non-Binary Turbo Codes (NB-TC)

Author

Rami, Klaimi, Abdel Nour, Charbel, Douillard, Catherine, and Farah, Joumana

Abstract

With the increasing demands for new multimedia applications and services, new communication scenarios should be introduced in the next communications standards in order to respond to such demands. Very high throughput communications, up to Terabits/second, are considered for some applications, while others call for very reliable data communications. In this context, new error correction schemes should be investigated. To this end, this poster describes a new family of error correction codes, based on the design of non-binary turbo codes defined over Galois fields GF(q), with q = 2^m and m > 1. &nbsp

Published
2019
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40. Turbo codes for Tb/s communications: code design and hardware architecture

Author

Garzon-Bohorquez, Ronald, Abdel Nour, Charbel, Weithoffer, Stefan, Douillard, Catherine, and Wehn, Norbert

Subjects
turbo code, Turbo Codes, high throughput architecture, GeneralLiterature_MISCELLANEOUS
Abstract

Prof. Catherine Douillard (from IMT Atlantique) gave a presentation entitled "Turbo codes for Tb/s communications: code design and hardware architecture" at the Oberpfaffenhofen Workshop on High Throughput Coding (OWHTC).

Published
2019
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