Maha Cherif Dakhli

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The combination of Multiple-Input Multiple-Output (MIMO) with Multi-Carrier Code Division Multiplexing Access (MC-CDMA) is a promising technique for achieving high performance with very high data rates in 4G broadband wireless communications. Nevertheless, Nonlinearity of High-Power Amplifier (HPA) plays a crucial role in the performance of MIMO MC-CDMA(More)
We propose a Non-Linear (NL) distortion compensator based on Neural Network (NN) accompanied with MMSE (Minimum Mean Square Error) which corrects the nonlinearity introduced by HPA (High Power Amplifier). The neural network consists on a feed-forward Multi-Layer Perceptron (MLP) associated with Levenberg-Marquardt learning algorithm. In this paper, the(More)
The combination of Multiple Input Multiple Output (MIMO) with Orthogonal Frequency Division Multiplexing (OFDM) is a promising technique for high performance with very high data rates in 4G broadband wireless communications. However, the non-linearities caused by the High Power Amplifier (HPA) degrade the performance of MIMO-OFDM systems. In this paper, we(More)
The current and future technologies for wireless communication, such as WiFi, WiMAX, LTE and DVB-T, using an OFDM signaling, choose a cognitive radio to solve the problem of scarcity of spectrum resources. One of the key issues is the large peak-to-average power ratio (PAPR) resulting in signal OFDM, what becomes, the performance of the transceiver is very(More)
This paper proposes a Nonlinear Distortion Cancellation (NDC) scheme of the nonlinearity HPA (High Power Amplifier) in the V-BLAST MIMO MC-CDMA (Vertical Bell Laboratories Layered Space-Time Multiple-Input Multiple-Output Multi-Carrier Code Division Multiplexing Access) systems over Rayleigh fading channel. The compensation of the nonlinearities effects in(More)
In this paper, we introduce the impact of non-linear high-power amplifier (NL HPA) on the bit error rate (BER) and on the spectrum efficiency of multicarrier techniques. A comparison between two multicarrier transmission techniques based on cognitive radio (CR) is presented: the classical orthogonal frequency division multiplexing (OFDM), based on cyclic(More)