Vincent Le Nir

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In this letter, analytical expressions are derived for the power spectral density (PSD) of orthogonal frequency division multiplex (OFDM) signals employing a cyclic prefix (CP-OFDM) or zero padding (ZP-OFDM) time guard interval. Under the relatively weak assumptions that (i) the data are independent and identically distributed on all OFDM subcarriers and(More)
Abstract— A cognitive radio system needs accurate knowledge of the radio spectrum it operates in. Blind modulation recognition techniques have been proposed to discriminate between single-carrier and multicarrier modulations and to estimate their parameters. Some powerful techniques use autocorrelation and cyclic autocorrelation based features of the(More)
In this article, we combine a Space-Time Block Code (STBC) with a Multi-Carrier Code Division Multiplex Access (MC-CDMA) system and a Turbo Code (TC) as channel code. MC-CDMA is likely to be one of the most promising access technique for future wireless communication systems [1][2]. In fact, MC-CDMA exploits the advantages of both the Orthogonal Frequency(More)
In cognitive radio, spectrum sensing is a challenging task. In this letter, a new spectrum sensing method is proposed based on Goodness of Fit test (GoF) of the energy of the received samples with a chi-square distribution. We derive the test statistic and evaluate the performance of the proposed method by Monte Carlo simulations. It is shown that our(More)
A tactical radio network is a radio network in which a transmitter broadcasts the same information to its receivers. In this paper, dynamic spectrum management is studied for multiple cognitive tactical radio networks coexisting in the same area. First, we consider the problem of common rate maximization subject to a total power constraint for a single(More)
We present a blind coarse timing offset estimation technique for CP-OFDM and ZP-OFDM transmission over frequency selective channels. The technique exploits the cyclic prefix or zero padding structure to estimate the starting position of the OFDM symbols without requiring any additional pilots. Simulation results are performed on various channel models with(More)
In this paper, the combination of spatial multiplexing with coded multi-carrier code division multiplex access (MC-CDMA) for a multiple input multiple output (MIMO) Rayleigh fading multipath channel is considered. A practical receiver structure performing the iteratively MIMO detection, multi-user despreading and channel decoding is presented. The MIMO(More)
Power Line Communication (PLC) is foreseen as a potential solution for increasing the throughput of future wireline communication systems. Indeed, the existing infrastructure allows the development of Broadband over Power Lines (BPL) to provide a competing high-speed Internet `to-the-home' alternative. The frequency selectivity and the impulsive noise of(More)
In this paper, we focus our attention on blind demodulation for multi-carrier modulation in the context of radio surveillance and military applications. We present a blind demodulation technique for CP-OFDM and ZP-OFDM transmission over frequency selective channels. The technique exploits the cyclic prefix or zero padding structure of the transmitted signal(More)
The duality between multiple-input multiple-output (MIMO) multiple-access channels (MAC) and MIMO broadcast channels (BCs) has been established under a total power constraint. The same set of rates for MAC can be achieved in BC exploiting the MAC-BC duality formulas while preserving the total power constraint. In this paper, we describe the BC optimal power(More)