9 papers
Joint Optimization of Bit and Power Loading for Multicarrier Systems
Ebrahim Bedeer, Octavia A. Dobre, Mohamed H. Ahmed +1
In this letter, a novel low complexity bit and power loading algorithm is formulated for multicarrier communication systems. The proposed algorithm jointly maximizes the throughput…
Constrained Joint Bit and Power Allocation for Multicarrier Systems
Ebrahim Bedeer, Octavia A. Dobre, Mohamed H. Ahmed +1
This paper proposes a novel low complexity joint bit and power suboptimal allocation algorithm for multicarrier systems operating in fading environments. The algorithm jointly maxi…
Optimal Bit and Power Loading for OFDM Systems with Average BER and Total Power Constraints
Ebrahim Bedeer, Octavia A. Dobre, Mohamed H. Ahmed +1
In this paper, a novel joint bit and power loading algorithm is proposed for orthogonal frequency division multiplexing (OFDM) systems operating in fading environments. The algorit…
A Novel Algorithm for Joint Bit and Power Loading for OFDM Systems with Unknown Interference
Ebrahim Bedeer, Mohamed F. Marey, Octavia A. Dobre +2
In this paper, a novel low complexity bit and power loading algorithm is formulated for orthogonal frequency division multiplexing (OFDM) systems operating in fading environments a…
A Novel Algorithm for Rate/Power Allocation in OFDM-based Cognitive Radio Systems with Statistical Interference Constraints
Ebrahim Bedeer, Octavia A. Dobre, Mohamed H. Ahmed +1
In this paper, we adopt a multiobjective optimization approach to jointly optimize the rate and power in OFDM-based cognitive radio (CR) systems. We propose a novel algorithm that…
Rate-Interference Tradeoff in OFDM-based Cognitive Radio Networks
Ebrahim Bedeer, Octavia A. Dobre, Mohamed H. Ahmed +1
In cognitive radio (CR) networks, secondary users (SUs) are allowed to opportunistically access the primary users (PUs) spectrum to improve the spectrum utilization; however, this…
Energy-Efficient Power Loading for OFDM-based Cognitive Radio Systems with Channel Uncertainties
Ebrahim Bedeer, Osama Amin, Octavia A. Dobre +2
In this paper, we propose a novel algorithm to optimize the energy-efficiency (EE) of orthogonal frequency division multiplexing-based cognitive radio systems under channel uncerta…
On Partially Overlapping Coexistence for Dynamic Spectrum Access in Cognitive Radio
Ebrahim Bedeer, Mohamed Marey, Octavia Dobre +1
In this paper, we study partially overlapping co-existence scenarios in cognitive radio environment. We consider an Orthogonal Frequency Division Multiplexing (OFDM) cognitive syst…
Adaptive Bit Allocation for OFDM Cognitive Radio Systems with Imperfect Channel Estimation
Ebrahim Bedeer, Mohamed Marey, Octavia Dobre +1
Cognitive radios hold tremendous promise for increasing the spectral efficiency of wireless communication systems. In this paper, an adaptive bit allocation algorithm is presented…