Charlotte Hucher

Publications

• A Low-Complexity Protocol for K-Parallel-Path Multihop Networks.

  Charlotte Hucher, Ghaya Rekaya-Ben Othman

  2010 IEEE Wireless Communications and Networking Conference, WCNC 2010, Proceedings, Sydney, Australia, 18-21 April 2010; 01/2010

• Hierarchical Modulation-based Cooperative Scheme: Minimizing the Symbol Error Probability

  C. Hucher, P. Sadeghi

  International Conference on Telecommunications (ICT), Doha, Qatar; 01/2010

• Mismatched Decoding for the Relay Channel

  C. Hucher, P. Sadeghi

  International Zurich Seminar (IZS), Zurich, Switzerland; 01/2010

• Diophantine Approximation Approach for Incomplete Decoding at Relays

  C. Hucher, G. Rekaya-Ben Othman, A. Saadani

  IEEE Information Theory Workshop (ITW), Taormina, Italy; 01/2009

• Definition and performance analysis of new cooperative protocols

  Charlotte Hucher

  01/2009

  Degree: PhD

  Supervisor: Jean-Claude Belfiore, Ghaya Rekaya-Ben Othman

• Incomplete decode-and-forward protocol using distributed space-time block codes

  Charlotte Hucher, Ghaya Rekaya-Ben Othman, Ahmed Saadani

  12/2008;

  In this work, we explore the introduction of distributed space-time codes in decode-and-forward (DF) protocols. A first protocol named the Asymmetric DF is presented. It is based on two phases of different lengths, defined so that signals can be fully decoded at relays. This strategy brings full div... [more] In this work, we explore the introduction of distributed space-time codes in decode-and-forward (DF) protocols. A first protocol named the Asymmetric DF is presented. It is based on two phases of different lengths, defined so that signals can be fully decoded at relays. This strategy brings full diversity but the symbol rate is not optimal. To solve this problem a second protocol named the Incomplete DF is defined. It is based on an incomplete decoding at the relays reducing the length of the first phase. This last strategy brings both full diversity and full symbol rate. The outage probability and the simulation results show that the Incomplete DF has better performance than any existing DF protocol and than the non-orthogonal amplify-and-forward (NAF) strategy using the same space-time codes. Moreover the diversity-multiplexing gain tradeoff (DMT) of this new DF protocol is proven to be the same as the one of the NAF.

• New protocols for the Cooperative MAC

  C. Hucher, G. Rekaya-Ben Othman, A. Saadani

  Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, USA; 10/2008

  In this work, we study the CMA-NAF protocol proposed by Azarian et al. in [1 ] and propose a practical implementation. We are interested in the case of two cooperating sources which want to transmit to the same destination. In this context, two slight improvements of the protocol provide a better DM... [more] In this work, we study the CMA-NAF protocol proposed by Azarian et al. in [1 ] and propose a practical implementation. We are interested in the case of two cooperating sources which want to transmit to the same destination. In this context, two slight improvements of the protocol provide a better DMT and lower error rates. We also propose to use a decode-and-forward strategy for the same system and thus define the CMA-IDF, based on the incomplete decoding proposed in [2 ]. Theoretical study as well as simulation results show these protocols perform better than the best known cooperative protocols used with a time-division multiple-access (TDMA) strategy, and than the best existing CMA protocol, the CMA- NAF. [1] K. Azarian, H. E. Gamal, and P. Schniter, "On the achievable diversity- multiplexing tradeoff in half-duplex cooperative channels", IEEE Trans. Inform. Theory, vol. 51, no. 12, pp. 4152-4172, December 2005. [2] C. Hucher, G. R.-B. Othman, and A. Saadani, "A New Incomplete Decode-and-Forward Protocol", in IEEE Wireless Communications and Networking Conference, March-April 2008

• A New Incomplete Decode-and-Forward Protocol

  C. Hucher, G. Rekaya-Ben Othman, A. Saadani

  IEEE Wireless Communications and Networking Conference, Las Vegas, US; 04/2008

  In this work, we explore the introduction of distributed space-time codes in decode-and-forward (DF) protocols. We propose a new Incomplete DF protocol, based on a partial decoding at the relays. This strategy allows the new protocol to bring both full diversity and full symbol rate. Outage probabil... [more] In this work, we explore the introduction of distributed space-time codes in decode-and-forward (DF) protocols. We propose a new Incomplete DF protocol, based on a partial decoding at the relays. This strategy allows the new protocol to bring both full diversity and full symbol rate. Outage probabilities and simulation results show that the Incomplete DF protocol has better performance than any existing DF protocol and than NAF protocols using the same space-time codes.

• How to solve the problem of bad performance of cooperative protocols at low SNR

  C. Hucher, G. Rekaya-Ben Othman, J-C. Belfiore

  EURASIP Journal on Advances in Signal Processing. 01/2008;

  We propose some new adaptive amplify-and-forward (AF) and decode-and-forward (DF) protocols using a selection. The new selection criterion is a function of the instantaneous capacities of all possible transmission schemes (with or without cooperation). Outage probabilities and simulation results sho... [more] We propose some new adaptive amplify-and-forward (AF) and decode-and-forward (DF) protocols using a selection. The new selection criterion is a function of the instantaneous capacities of all possible transmission schemes (with or without cooperation). Outage probabilities and simulation results show that the adaptive cooperation protocols solve the problem of bad performance of cooperation protocols at low SNR. Moreover, they improve the asymptotic performance of their corresponding AF and DF protocols.

• A New Incomplete Decode-and-Forward Protocol.

  Charlotte Hucher, Ghaya Rekaya-Ben Othman, Ahmed Saadani

  WCNC 2008, IEEE Wireless Communications & Networking Conference, March 31 2008 - April 3 2008, Las Vegas, Nevada, USA, Conference Proceedings; 01/2008

• Codage spatio-temporel pour système coopératif

  Ahmed SAADANI, Charlotte HUCHER, Ghaya REKAYA

  Ref. No: 0757576

  Year: 09/2007

• Adaptive Amplify-and-Forward Cooperative Channel

  Charlotte Hucher, Ghaya Rekaya-Ben Othman, Jean-Claude Belfiore

  Information Theory, 2007. ISIT 2007. IEEE International Symposium on; 07/2007

  In this work, we propose an amplify-and-forward (AF) protocol based on a new selection criterion, a function of the instantaneous capacities of all possible transmission schemes (with or without cooperation). The outage probability and the simulation results show that the new Adaptive AF protocol ha... [more] In this work, we propose an amplify-and-forward (AF) protocol based on a new selection criterion, a function of the instantaneous capacities of all possible transmission schemes (with or without cooperation). The outage probability and the simulation results show that the new Adaptive AF protocol has better performance than the best known AF protocol (NAF). Moreover, this protocol solves the problem of the bad performance of NAF at low SNR. We also make a relay-selection to obtain a better diversity-order and then better performance.

• AF and DF Protocols based on Alamouti ST Code

  Charlotte Hucher, Ghaya Rekaya-Ben Othman, Jean-Claude Belfiore

  Information Theory, 2007. ISIT 2007. IEEE International Symposium on; 07/2007

  In this work we propose a new amplify-and-forward (AF) protocol and a new decode-and-forward (DF) protocol based on the Alamouti space-time (ST) code, chosen because of its decoding simplicity. We also apply a new selection criterion for AF and DF protocols that improves their performance and solves... [more] In this work we propose a new amplify-and-forward (AF) protocol and a new decode-and-forward (DF) protocol based on the Alamouti space-time (ST) code, chosen because of its decoding simplicity. We also apply a new selection criterion for AF and DF protocols that improves their performance and solves the problem of bad performance at low SNR. Finally, we apply the Alamouti AF and DF protocols to a "non-line-of-sight" (NLOS) scheme to bring diversity. Outage probabilities and simulation results show that at low spectral efficiency, in spite of their rate of ½ symbol per channel use, these Alamouti AF and DF protocols have better performance than the non-orthogonal AF (NAF) protocol.

• Adaptive Amplify-and-Forward Cooperative Channel

  C. Hucher, G. Rekaya-Ben Othman, J-C. Belfiore

  IEEE International Symposium on Information Theory, Nice, France; 06/2007

  In this work, we propose an amplify-and-forward (AF) protocol based on a new selection criterion, a function of the instantaneous capacities of all possible transmission schemes (with or without cooperation). The outage probability and the simulation results show that the new Adaptive AF protocol ha... [more] In this work, we propose an amplify-and-forward (AF) protocol based on a new selection criterion, a function of the instantaneous capacities of all possible transmission schemes (with or without cooperation). The outage probability and the simulation results show that the new Adaptive AF protocol has better performance than the best known AF protocol (NAF). Moreover, this protocol solves the problem of the bad performance of NAF at low SNR. We also make a relay-selection to obtain a better diversity-order and then better performance.

• Adaptive Amplify-and-Forward (AF) Cooperation

  C. Hucher, G. Rekaya-Ben Othman, J-C. Belfiore

  IEEE Winter School on Coding and Information Theory, La Colle sur Loup, France; 03/2007

  We propose an Adaptive AF protocol based on a new selection criterion, a function of the instantaneous capacities of all possible transmission schemes. Both outage probability and simulation results show that the Adaptive AF has better performance than the best known AF protocol (NAF) and solves the... [more] We propose an Adaptive AF protocol based on a new selection criterion, a function of the instantaneous capacities of all possible transmission schemes. Both outage probability and simulation results show that the Adaptive AF has better performance than the best known AF protocol (NAF) and solves the problem of the bad performance at low SNR.