Browsing by Author "D'Amours, Claude"
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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, Habib