Yasin Celik

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Extreme scale computing has no implied scaling limit. The impossibility of implementing reliable communication between crashing hosts prohibits explicit-communication primitives in extreme scale applications. However, the alternatives are not well investigated. This paper reports the development and experimentation of a prototype implicit communication(More)
For the last three decades, end-to-end computing has been the de facto paradigm for distributed and parallel computing. MPI (Message Passing Interface), RPC (Remote Procedure Call), OpenMP (share memory) and RMI (Remote Method Invocation) are all end-to-end protocols from the same computing paradigm. A myth persisted since 1990's that while the data(More)
In this paper, we investigate joint channel gain and time offset estimation for two different data aided methods in cooperative communication with amplify-and-forward (AF) relaying. First one is the Cascaded Estimation (CE) method which channel gain, and time offset consisting of both source-to-relay, and relay-to-destination links are estimated at the(More)
In this paper, we investigate the two single carrier frequency domain equalization (SC-FDE) techniques, namely on-off keying single carrier frequency domain equalization (OOK-SC-FDE) and decomposed quadrature optical (DQO)-SC-FDE, under realistic channel conditions with a practical LED model for visible light communications (VLC). We first compare their(More)
In this paper, the performance of direct current informative subcarrier intensity modulation (DCI-SIM) which is proposed to enhance the power efficiency of subcarrier intensity modulation (SIM) is investigated in visible light communication. The BER performance of DCI-SIM is compared with SIM, pulse amplitude modulation (PAM) and, enhanced unipolar(More)
A major problem in free-space optical (FSO) communication is the atmospheric turbulence-induced fading. In this paper, we consider two fading-mitigation techniques for FSO links. We study cooperative FSO links with relay selection and repetition coding with intensity modulation and direct detection (IM/DD) over lognormal fading channels. To compare these(More)
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