Browsing by Author "Dahmane, Adel Omar"
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Item Advanced key distribuation center algorithm (AKDC)(2010) Abuazab, Hussam Hussein; Dahmane, Adel Omar; Hamam, HabibItem Design and formal validation of a mutual authentication protocol for RFID technology(2010) Fennani, Bassem; Dahmane, Adel Omar; Hamam, HabibItem FPGA implementation of floating-point complex matrix inversion based on GAUSS-JORDAN elimination(2013) Moussa, Sherif; Razik, Ahmed M. Abdel; Dahmane, Adel Omar; Hamam, HabibThis work presents the architecture of an optimized complex matrix inversion using GAUSS-JORDAN elimination (GJ-elimination) on FPGA with single precision floating-point representation to be used in MIMO-OFDM receiver. This module consists of single precision floating point arithmetic components and control unit which perform the GJ-elimination algorithm. The proposed architecture performs the GJ-elimination for complex matrix element by element. Only critical arithmetic operations are calculated to get the needed values without performing all the arithmetic operations of the GJ-elimination algorithm. This results in a reduced hardware resources and execution time. © 2013 IEEE.Item MIMO-OFDM scheme based on parity bit selected spreading(Institute of Electrical and Electronics Engineers Inc., 2012) Moussa, Sherif; Dahmane, Adel Omar; D'Amours, Claude; Hamam, HabibIn this paper, a novel transmission scheme is developed to effectively combine parity bit selected spreading technique and MIMO-OFDM to obtain improved bit error rate performance in the presence of frequency selective fading channels with low system complexity. Unlike conventional MIMO-OFDMA, where users are separated in different frequency bands (subchannels), and each user is coded separately using STBC or SFBC, the proposed new scheme enables multi access by joint code design across multiple antennas, subcarriers, and users. Such system will benefit from the combined space and frequency domain freedom as well as multiuser diversity. Hence, better spectrum efficiency is achieved while improving bit error rate performance with respect to signal-to- interference ratio. © 2012 IEEE.Item MIMO-OFDM scheme based on permutation spreading(Institute of Electrical and Electronics Engineers Inc., 2012) Moussa, Sherif; Dahmane, Adel Omar; D'Amours, Claude; Hamam, HabibIn this paper, a novel transmission scheme is developed to effectively combine permutation spreading technique with MIMO-OFDM to obtain improved bit error rate performance in the presence of frequency selective fading channels with low system complexity. Unlike conventional MIMO-OFDMA, where users are separated in different frequency bands (subchannels), and each user is coded separately using STBC or SFBC, the proposed new scheme enables multi access by joint code design across multiple antennas, subcarriers, and users. Such system will benefit from the combined space and frequency domain freedom as well as multiuser diversity. Hence, better spectrum efficiency is achieved while improving bit error rate performance with respect to signal-to-interference ratio © 2012 GIRI.Item OFDM with parity bit selected block spreading(Institute of Electrical and Electronics Engineers Inc., 2010) Moussa, Sherif; Dahmane, Adel Omar; D'Amours, Claude; Hamam, HabibIn this paper, a new scheme that combines Orthogonal Frequency Division Multiplexing (OFDM) with parity bit selected block spreading is introduced. In this proposed method, the data symbols in each block is used to select the spreading code. Therefore, frequency diversity in the system is increased as well as improving the symbol detection due to the inherent coding in the spreading technique. Simulation results show significant improvement in BER performance for the proposed system compared with conventional OFDM one. © 2009 IEEE.Item OFDM with permutation block spreading(Institute of Electrical and Electronics Engineers Inc., 2011) Moussa, Sherif; Dahmane, Adel Omar; D'Amours, Claude; Hamam, HabibIn this paper, a new Orthogonal Frequency Division Multiplexing (OFDM) with Permutation block spreading scheme is introduced; the transmitted stream is divided into blocks and the data symbols in each block is used to select the spreading code. Therefore, the increased frequency diversity in the system due to spreading improves bit error rate performance in the presence of frequency selective fading channels. In addition to that the new scheme improves symbol detection due to the inherited coding in the spreading technique. Simulation results show significant improvement in BER performance for the proposed system compared with conventional OFDM. © 2011 IEEE.Item Rapid prototyping of channel estimation techniques in MIMO-OFDM systems(2013) Hogue, Marie-Josée Vincent; Dahmane, Adel Omar; Moussa, Sherif; D'Amours, ClaudeIn this paper, reduced complexity channel estimation techniques that was first proposed in case of Single Input Single Output Orthogonal Frequency Division Multiplexing (SISO-OFDM) is generalized in case of multiple-input multiple-output-OFDM (MIMO-OFDM) systems. The impact of complexity reduction is analyzed through floating point simulation, fixed point simulation and FPGA implementation using rapid prototyping. © 2013 IEEE.Item Rapid prototyping of MIMO-OFDM based on parity bit selected and permutation spreading(John Wiley and Sons Ltd, 2016) Moussa, Sherif; Razik, Ahmed M. Abdel; Dahmane, Adel Omar; D'Amours, Claude; Hamam, HabibItem Review - Challenges of mobility aware MAC protocols in WSN(Institute of Electrical and Electronics Engineers Inc., 2018) Sudheendran, Sijo; Bouachir, Ons; Moussa, Sherif; Dahmane, Adel OmarIn today's smart world WSN plays an important role in IoT. The WSN nodes can be used for wildlife, patient, air quality monitoring. WSN consists of numerous sensor nodes that are connected to each other. One of the major concerns of WSN is the mobility of nodes. The mobility of the nodes creates concern to the MAC protocols that's defined for WSN static nodes. Mobile-WSN demands the participated nodes to send packets with a bursty traffic, low energy consumption and reliable connection. MAC protocol is the most important in designing the WSN as MAC plays an important role regarding throughput, mobility, security and energy consumption. This paper gives a review on mobility aware protocols such as M-MAC, MA-MAC, MMH-MAC, M-Contiki, MobiIQ, MobiDisc. © 2018 IEEE.