Salman Ahmad
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Research Interests
Salman Ahmad has a total of 4 co-authors. Here are the top co-authors by number of shared publications:
- F. Rashid
University of Engineering and Technology, Taxila
1 shared publication - Farhan Qamar
Department of Computer Engineering , University of Engineering and Technology , Taxila , Pakistan
1 shared publication M. F. Rashid
University of Engineering and Technology, Taxila
1 shared publicationMuhammad Zafrullah
Department of Electrical Engineering, University of Engineering and Technology (UET), Taxila, Pakistan
1 shared publication
Latest Publications
- Open Access
- 30 September 2016
- Published by Pakistan Atomic Energy Commission in The Nucleus
- Vol. 53 (3) , 195-199
Implementation of OFDM-RoF at 60 GHz with DCF for Long Haul Communication
In this paper, a new design of optical system is proposed and analyzed which combine coherent OFDM with radio over fiber (RoF) for achieving data rate of 40 Gbps over 150 km Single Mode Fiber (SMF). Optical heterodyne method is used for generation of 60 GHz Millimeter wave. The transmitted RF signal through optical fiber using RoF method is degraded and to compensate it, post compensation scheme of Dispersion Compensating Fiber (DCF) is used. Constellation diagram has been observed after 150 km with and without DCF for performances evaluation of OFDM RoF system. The BER at receiver end is evaluated and from the results it can be concluded that the transmission distance and data rate has been increased
- 30 September 2016
- Published by Pakistan Atomic Energy Commission in The Nucleus
- Vol. 53 (3) , 195-199
Open AccessImplementation of OFDM-RoF at 60 GHz with DCF for Long Haul Communication
In this paper, a new design of optical system is proposed and analyzed which combine coherent OFDM with radio over fiber (RoF) for achieving data rate of 40 Gbps over 150 km Single Mode Fiber (SMF). Optical heterodyne method is used for generation of 60 GHz Millimeter wave. The transmitted RF signal through optical fiber using RoF method is degraded and to compensate it, post compensation scheme of Dispersion Compensating Fiber (DCF) is used. Constellation diagram has been observed after 150 km with and without DCF for performances evaluation of OFDM RoF system. The BER at receiver end is evaluated and from the results it can be concluded that the transmission distance and data rate has been increased
- 6 November 2014
- Published by Taylor & Francis in Journal of Modern Optics
- Vol. 62 (4) , 296-301
40 Gb/s 4-QAM OFDM radio over fiber system at 60 GHz employing coherent detection
In this paper, the simulation of 60 GHz millimeter-wave radio over fiber link with 4-QAM OFDM modulation format at 40 Gb/s over 150 km SMF is proposed. The 60 GHz millimeter-wave signal is generated by the optical heterodyne method. Coherent detection has been used at the receiver to down-convert millimeter-wave signal to IF band. Introduction of the OFDM modulation in RoF-based system realizes the benefits of higher order modulations (such as 4-QAM, 16-QAM, etc.) to ensure the good spectral efficiency and multi-gigabit access. The performance of the system is analyzed by Q-factor and BER by which it can be shown that the best results are obtained at the input power of 10 dBm. The simulation results clearly demonstrate the feasibility of this 4-QAM OFDM RoF system over 150 km fiber link.
- 6 November 2014
- Published by Taylor & Francis in Journal of Modern Optics
- Vol. 62 (4) , 296-301
40 Gb/s 4-QAM OFDM radio over fiber system at 60 GHz employing coherent detection
In this paper, the simulation of 60 GHz millimeter-wave radio over fiber link with 4-QAM OFDM modulation format at 40 Gb/s over 150 km SMF is proposed. The 60 GHz millimeter-wave signal is generated by the optical heterodyne method. Coherent detection has been used at the receiver to down-convert millimeter-wave signal to IF band. Introduction of the OFDM modulation in RoF-based system realizes the benefits of higher order modulations (such as 4-QAM, 16-QAM, etc.) to ensure the good spectral efficiency and multi-gigabit access. The performance of the system is analyzed by Q-factor and BER by which it can be shown that the best results are obtained at the input power of 10 dBm. The simulation results clearly demonstrate the feasibility of this 4-QAM OFDM RoF system over 150 km fiber link.