90 citations · 428 across the 38 of their papers we have counts for
5 papers · 1 filter
Stable Throughput Region of Cognitive-Relay Networks with Imperfect Sensing and Finite Relaying Buffer
Ahmed M. Alaa
In this letter, we obtain the stable throughput region for a cognitive relaying scheme with a finite relaying buffer and imperfect sensing. The analysis investigates the effect of…
Band-Sweeping M-ary PSK (BS-M-PSK) Modulation and Transceiver Design
Ahmed M. Alaa
Channel Estimation is a major problem encountered by receiver designers for wireless communications systems. The fading channels encountered by the system are usually time variant…
Spectrum Sensing Via Reconfigurable Antennas: Fundamental Limits and Potential Gains
Ahmed M. Alaa, Mahmoud H. Ismail, Hazim Tawfik
We propose a novel paradigm for spectrum sensing in cognitive radio networks that provides diversity and capacity benefits using a single antenna at the Secondary User (SU) receive…
Globally Optimal Cooperation in Dense Cognitive Radio Networks
Ahmed M. Alaa, Omar A. Nasr
The problem of calculating the local and global decision thresholds in hard decisions based cooperative spectrum sensing is well known for its mathematical intractability. Previous…
Spectrum Sensing Via Reconfigurable Antennas: Is Cooperation of Secondary Users Indispensable?
Ahmed M. Alaa, Mahmoud H. Ismail, Hazim Tawfik
This work presents an analytical framework for characterizing the performance of cooperative and noncooperative spectrum sensing schemes by figuring out the tradeoff between the ac…