Browsing by Author "Rad, M. M."

Now showing 1 - 4 of 4

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All-optical amplify-and-forward relaying system for atmospheric channels
(IEEE, 2012-10) Aminikashani, Mohammadreza; Rad, M. M.; Safari, M.; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, Murat; Aminikashani, Mohammadreza
In this letter, we investigate the performance of a dual-hop free space optical link with an all-optical amplify-and-forward relay. We employ photon counting methodology and derive closed form expressions for the end-to-end signal-to-noise ratio and the outage probability. In our derivations, we consider either full or partial channel state information (CSI) at the relay and take into account practical limitations such as amplifier noise and filtering effects. Our results indicate significant performance improvements over direct transmission and furthermore demonstrate that semi-blind relaying (which depends only on statistical CSI) provides nearly identical performance to its full-CSI counterpart.
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Multi-hop relaying over the atmospheric poisson channel
(IEEE, 2011) Safari, M.; Rad, M. M.; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, Murat
In this paper, we study the outage behavior of a decode-and-forward multi-hop free-space optical (FSO) system over a Poisson channel degraded by atmospheric turbulence. We assume that perfect channel side information (CSI) is available at the receiver side and consider both cases of perfect CSI and no CSI at the transmitter side. We solve the outage probability minimization problem subject to a peak power constraint as well as a short- or long-term average sum power constraint. As a result, optimal power control strategies are presented for different scenarios under consideration. A sub-optimal yet low-complexity solution is further proposed under the short-term power constraint. Our results demonstrate that multi-hop relaying yields significant performance improvements which are particularly important for long-range FSO links.
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Multi-hop relaying over the atmospheric poisson channel: outage analysis and optimization
(IEEE, 2012-03) Safari, M.; Rad, M. M.; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, Murat
In this paper, we study the outage behavior of a decode-and-forward multi-hop free-space optical (FSO) system over a Poisson channel degraded by atmospheric turbulence. We assume that perfect channel side information (CSI) is available at the receiver side and consider both cases of perfect CSI and no CSI at the transmitter side. We solve the outage probability minimization problem subject to a peak power constraint as well as a short- or long-term average sum power constraint. As a result, optimal power control strategies are presented for different scenarios under consideration. A sub-optimal yet low-complexity solution is further proposed under the short-term power constraint. Our results demonstrate that multi-hop relaying yields significant performance improvements which are particularly important for long-range FSO links.
Metadata only
A novel pulse-positioned coding scheme for fiber fault monitoring of a PON
(IEEE, 2011-09) Rad, M. M.; Fathallah, H. A.; Maier, M.; Rusch, L. A.; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, Murat
In this letter, we propose a novel optical coding scheme for fiber link quality monitoring of a passive optical network (PON). The proposed scheme named incrementally pulse positioned coding (IPPC) is practically very attractive due to its simple design and fabrication process, small size, zero coding loss and low cost. We demonstrate the superior correlation properties of IPPC over existing codes, address the design considerations, and evaluate its performance for a PON monitoring system via the average signal-to-interference ratio (SIR).