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)
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)
Cognitive Radio (CR) Technology has emerged for the future of wireless communications, its key parameters of interest are frequency, power and modulation techniques. The Spectrum Sensing is an important task to determine the availability of the vacant channels. In Multicarrier Communication using Digital Signal Processing Techniques, Filter Bank Multi(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)