Pierre Siohan - Profile on Academia.edu (original) (raw)

Papers by Pierre Siohan

Joint source-channel turbo decoding of MPEG-4 motion vectors

Canadian Conference on Electrical and Computer Engineering, 2005.

The use of variable length codes (VLCs) is one of the key element in obtaining high compression r... more The use of variable length codes (VLCs) is one of the key element in obtaining high compression rates in source coding. However the transmission of VLCs also introduces a high risk of error propagation. In this context joint source-channel decoding can be an efficient alternative to the classical approach of separated source-channel decoding. Our paper illustrates this situation with the

Sampling pattern conversion with 2-D FIR filters

The problem of conversion between different periodic sampling structures is of importance in a nu... more The problem of conversion between different periodic sampling structures is of importance in a number of applications related to multidimensional signal processing. For instance in areas of image processing, as multiresolution representations or high definition television, one has to modify sampling structures. For these types of processing finite impulse response (FIR) digital filters offer two main advantages, firstly a strictly linear phase, or a zero-phase, characteristic can be easily obtained, secondly they avoid the stability problem inherent to infinite impulse response (IIR) digital filters. In this paper, the design problem is stated for two-dimensional (2-D FIR) digital filters in the context of a transformation, defined by two integer parameters, which allows the conversion, in both directions, from an orthogonal to a quincunx sampling structure, which will be called (L,K) structure. The filter coefficients are obtained after a minimisation of the maximum error in the fr...

Optimal filter design for sampling pattern conversion

Sixth Multidimensional Signal Processing Workshop

Summary form only given. Two types of spatial sampling patterns, one with an orthogonal structure... more Summary form only given. Two types of spatial sampling patterns, one with an orthogonal structure and one having a quincunx structure, both related by two parameters, L and K, with integer values, have been investigated. The following results have been obtained: (1) the definition of a family of diamond-shaped filters having an ideal shape for an up- or down-sampling conversion with given parameters L and K; (2) the determination of a set of constraints in the frequency domain and their equivalent in the spatial domain for linear-phase 2D finite-impulse-response (FIR) digital filters; (3) the design of 2D FIR filters with specifications and constraints depending on the parameters L and K; (4) the presentation with a zone plane of the distortion introduced by the sampling pattern conversion for various values of L and K ; and (5) the cascading of two sampling pattern conversions in order to convert a (L1, K1) quincunx structure into a (L2, K2) quincunx structure

Comparative evaluation on real-time hardware platforms of coded OFDM/QAM and OFDM/OQAM systems

2012 International Symposium on Wireless Communication Systems (ISWCS), 2012

ABSTRACT

Procédé d'application des codes orthogonaux réels à la transmission d'un signal OQAM

Axel Le Poupon Méthodes optimales et sous-optimales d’allocation de ressources efficace en codage numérique

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 1999

Determination of a canonical lattice structure for odd length linear-phase PR filter banks

1996 IEEE International Conference on Acoustics, Speech, and Signal Processing Conference Proceedings

The problem of designing two-channel perfect reconstruction filter banks with odd length FIR line... more The problem of designing two-channel perfect reconstruction filter banks with odd length FIR linear phase analysis and synthesis filters is revisited. Based on an algebraic approach we introduce a complete and canonical lattice structure. Design examples show that, for short length filters, multiplierless realizations providing an acceptable frequency behaviour were attainable

Method of Receiving a Multicarrier Signal Implementing an Estimation of the Interference, Corresponding Reception Device and Computer Program

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2016

A multicarrier signal can be seen as a Gabor family whose coefficients are the symbols to be tran... more A multicarrier signal can be seen as a Gabor family whose coefficients are the symbols to be transmitted and whose generators are the time-frequency shifted pulse shapes to be used. In this article, we consider the case where the signaling density is increased such that interpulse interference is unavoidable. Such an interference is minimized when the Gabor family used is a tight frame. We show that, in this case, interference can be approximated as an additive Gaussian noise. This allows us to compute theoretical and simulated bit-error-probability for a non-coded system using a quadrature phase-shift keying constellation. Such a characterization is then used in order to predict the convergence of a coded system using low-density parity check codes. We also study the robustness of such a system to errors on the received bits in an interference cancellation context.

Methods for transmitting and receiving an ofdm-type multicarrier signal, and corresponding pilots

Synth�se des filtres num�riques non r�cursifs � phase lin�aire et coefficients de longueur finie

Adt, 1984

Design method of OFDM/OQAM systems using a weighted time-frequency localization criterion

2010 18th European Signal Processing Conference, Aug 1, 2010

Methods for the Transmission and Reception of a Multicarrier Signal Comprising Isolated Pilots, and Corresponding Devices and Computer Program Products

This document provides intermediate results of the concepts being developed in the radio link res... more This document provides intermediate results of the concepts being developed in the radio link research of METIS. For each of the technology components (TeC) within the technology component clusters (TeCC), covering flexible air interface, new waveforms, modulation and coding techniques as well as multiple access, medium access control and enablers for radio resource management, key findings and conclusions collected so far are summarized in section 2. Continuative descriptions and research outcomes are given in the annex and referred publications. The results presented here will be extended in the further progress of the project, and they will be used in the next phase of the project to develop and refine the overall METIS system concept instantiated by the horizontal topics. The suitability of the single technology components for the overall system design being able to meet the wide range of requirements for 5G will then be evaluated.

Source-Channel Tradeoffs in Iterative Joint Source-Channel Decoding of Sources with Memory

Joint source - channel deco ding with soft information: A survey

Biorthogonal filter banks with nearly optimal time-frequency localization

2000 10th European Signal Processing Conference, Sep 1, 2000

2008 Ieee 19th International Symposium on Personal Indoor and Mobile Radio Communications, Sep 1, 2008

Multi-carrier Modulation (MCM) and especially Orthogonal Frequency Division Multiplexing (OFDM) a... more Multi-carrier Modulation (MCM) and especially Orthogonal Frequency Division Multiplexing (OFDM) are currently used in many radio transmission standards. Among these modulations, OFDM/OQAM is an interesting alternative to OFDM. However, a simple one-tap Zero Forcing (ZF) equalization of OFDM/OQAM modulation may cause a performance floor problem, while the transmission meets a requirement of high order constellations. Therefore, more complex equalization needs to be considered, such as Equalization with Interference Cancellation (EIC) technique, which has been presented to counteract the performance floor problem. In this paper, we propose a system design based on OFDM/OQAM modulation with Cyclic Prefix (CP) to also counteract the performance floor problem and keep simple equalization at receiver. The simulation results illustrate the efficiency of this system.

2 dB Better Than CP-OFDM with OFDM/OQAM for Preamble-Based Channel Estimation

2008 Ieee International Conference on Communications, May 19, 2008

OFDM/OQAM is a special type of multi-carrier modulation that can be considered as an alternative ... more OFDM/OQAM is a special type of multi-carrier modulation that can be considered as an alternative to conventional OFDM with cyclic prefix (CP) for transmission over multi-path fading channels. Indeed, as it requires no CP, it has the advantage of a theoretically higher spectral efficiency. Furthermore, efficient pulse shaping can also be easily implemented with OFDM/OQAM. However, the classical channel estimation