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The principal objective of cognitive radio (CR) networks is to configure and share dynamically the spectrum resources in order to avoid user interference and congestion. This goal is limited by the effect of errors synchronization between primary and secondary users. In this paper, we study the impact of the asynchronism on the cyclic prefix-based orthogonal frequency division multiplexing modulation...
In the future fifth generation networked society, devices will suffer from the asynchronous multi-carrier effect which impacts the user’s quality of experience. This paper investigates the timing misalignment effect on interference level in the context of a cognitive radio (CR) network. Our study considers both multicarrier techniques orthogonal frequency division multiplexing (OFDM) and filter bank...
Wireless communication had a significant evolution over the last few years especially with the progress of 5G networks. In our paper, we investigate the impact of the asynchronism on the performance of a Cognitive Radio (CR) network, using the underlay paradigm. We provide a new theoretical aspect of interference analysis in the context of Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM)...
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 prefix (CP), and the filter bank-based multicarrier...
In this paper, we investigate the impact of the asynchronismon the performance of a Cognitive Radio (CR) network, using the underlay paradigm. We are also comparing this effectdepending on which modulation technique we are using. Weprovide a new the theoretical aspect of interference analysis in thecontext of orthogonal frequency division multiplexing (OFDM) and the Filter Bank Multicarrier (FBMC)...
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 sensitive to nonlinear distortions caused...
In order to achieve better spectral efficiency, several prototypes have been suggested as physical layer candidates for cognitive radio systems as OFDM (Orthogonal Frequency Division Multiplexing), SRRC (Square Root Raised Cosine) and others. In such models, we are confronted to problems of interference between the cognitive users and licensed users which degrade the performances of using models....
In this paper, we investigate the impact of the asynchronism on the performance of a Cognitive Radio (CR) network, using the underlay paradigm. We are also compareing this effect depending on which modulation technique we are using. We provide a new the theoretical aspect of interference analysis in the context of orthogonal frequency division multiplexing (OFDM) and the Filter Bank Multicarrier (FBMC)...
In the last years, Ultra Wideband (UWB) systems have received growing interest for their low-power consumption and low-complexity implementation. Because of the ultra-short emitted waveforms nature, timing acquisition presents a most important challenge for achieving good performance. In this paper, in order to address this task and to achieve this goal, we design and test a novel timing acquisition...
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