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Mohammed, Abd-Elnaby
- Enhanced PF Scheduling Algorithm for LTE Downlink System
Authors
1 Department of Electronics and Electrical Communications, Menoufia University, Menouf, 32952, EG
Source
Networking and Communication Engineering, Vol 5, No 12 (2013), Pagination: 505-509Abstract
A key feature of Long Term Evolution (LTE) system is the adoption of advanced Radio Resource Management (RRM) procedures in order to increase the system performance. Packet scheduling mechanisms play a fundamental role, because they are responsible for choosing how to distribute radio resources among different stations. In this paper a modified Proportional Fair (PF) scheduling algorithm is proposed for capacity enhancement for LTE system and compared with the PF downlink scheduler, which is characterized by high fairness but with low spectral efficiency. Simulation results show that the proposed algorithm enhances the overall system capacity and also provides fairness in the distribution of the resources. The proposed algorithm improves the average cell throughput by more than 10.3 %, with approximately the same fairness level (2.6 % reduction) as compared with the conventional PF scheduling algorithm.Â
Keywords
LTE, Packet Scheduling, PF, Fairness, RRM.
- Analytical Study for Helicopter-Satellite Communications Systems
Authors
1 Department of Electronics and Electrical Communications, Higher Institute of Engineering, El Shorouk Academy, El Shorouk City, EG
2 Department of Electronics and Electrical Communications, Faculty of Electronic Engineering, Menoufia University, Menouf, EG
3 Department of Electronics and Electrical Communications, Menoufia University, Menouf, EG
Source
Networking and Communication Engineering, Vol 5, No 12 (2013), Pagination: 510-515Abstract
In the helicopter-Satellite Communication (H-SATCOM) the periodic blockage of the received signal due to rotor blades and carrier frequency fluctuation due to Doppler shift are two dominant impairments. This paper investigates the performance of a Helicopter–Satellite communications system from an analytical view point under conditions such as the periodic blockage due to rotor blades, time diversity transmission technique, and Viterbi decoding technique. Bit Error Probability is considered as the performance metric. The deduced mathematical expressions for periodic blockage, time diversity transmission technique, and Viterbi decoding are matched well with those resulting from simulations. Hence our analysis can be considered as a theoretical platform for further modification, development, and guidance for originating application. Also it gives precision, direction for problem solution, and system control.
Keywords
Helicopter-Satellite Communication (H-SATCOM), Bit Error Rate (BER).- Continuous Phase Modulation for Digital Video Broadcasting
Authors
1 ERTU (Egyptian Radio & TV Union), Cairo, EG
2 Dept.of Electronics and Electrical Communications, Menoufia University, EG
3 Huazhong University of Science and Technology, Wuhan, CN
4 Department of Electronics and Electrical Communication, Menoufia University, Menouf, EG
5 Electronic and Communication Engineering Dept., Menoufia University, EG
6 Department of Electronics and Electrical Communications, Menoufia University, Menouf, EG