J
Jean-François Hélard
Researcher at Intelligence and National Security Alliance
Publications - 224
Citations - 1953
Jean-François Hélard is an academic researcher from Intelligence and National Security Alliance. The author has contributed to research in topics: Orthogonal frequency-division multiplexing & MIMO. The author has an hindex of 21, co-authored 224 publications receiving 1891 citations. Previous affiliations of Jean-François Hélard include Centre national d'études des télécommunications & Orange S.A..
Papers
More filters
Patent
Device for the transmission of digital data with at least two levels of protection and corresponding reception device
TL;DR: In this paper, the authors propose a scheme for the transmission of digital data with at least two levels of protection, of the type providing for the distribution of the data to be transmitted in the form of digital elements in the time-frequency space and transmission of symbols each formed by a multiplex of N orthogonal carriers modulated by a set of the digital elements.
Journal ArticleDOI
Linear MMSE detection technique for MC-CDMA
TL;DR: A novel detection technique for MC-CDMA systems based on the MMSE criterion applied per user is presented and simulation results in a Rayleigh fading channel show very good performance, mainly for non-full-load systems.
Patent
Method for the broadcasting of digital data, notably for radio broadcasting at high bit rate towards mobile receivers, with time-frequency interlacing and coherent demodulation
TL;DR: In this paper, the authors proposed a method for the broadcasting of digital data, intended to be received by mobile receivers moving about in an urban environment, that is, under conditions of multiple propagation and in the presence of parasites and jamming, enabling a coherent demodulation under such conditions of reception.
Journal ArticleDOI
Multicarrier CDMA techniques for future wideband wireless networks
TL;DR: The efficiency of MC-CDMA as a very promising multiple access and robust modulation scheme is successfully demonstrated for the downlink of the future wideband mobile networks.
Journal ArticleDOI
Spreading sequences for uplink and downlink MC-CDMA systems: PAPR and MAI minimization
TL;DR: An optimized spreading sequence allocation procedure is presented and a selection of the spreading codes which jointly reduces the multiple access interference and the crest factor is proposed for downlink MC-CDMA systems.