Tugba Ozbilgin

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Spatial modulation (SM) is a recently proposed effective multiple input multiple output communications technique. In this paper the performance of SM in free space optical (FSO) systems under atmospheric turbulence channels is analyzed. Pulse position modulation (PPM) is used as the modulation technique. In the performance results the benefits of utilizing(More)
We present a novel multiple-input multiple-output (MIMO) optical modulation method that combines spatial modulation (SM) with multilevel polarization shift keying (MPOLSK). The proposed approach, denoted SM-MPOLSK, offers better power and spectral efficiencies than conventional optical modulation methods. We evaluate the performance of SM-MPOLSK over free(More)
We investigate the error performance of a satellite-to-ground optical link between a low-earth orbit (LEO) satellite and an optical ground station (OGS) in which a geostationary orbit (GEO) satellite is used as a relay. We perform a bit-error probability (BEP) analysis by taking the atmospheric turbulence effects and pointing errors into account. We use(More)
We investigate the error performance of both multilevel polarization shift keying (MPOLSK) and spatial modulation based MPOLSK (SM-MPOLSK) architectures for multiple-input-multiple-output (MIMO) communication over atmospheric turbulence channels. We first show that bit groups corresponding to each signalling dimension of these architectures are affected(More)
The problems related to the video transmission in wireless peer-to-peer networks arise from the decentralized and dynamic behavior of these networks, drawbacks of wireless environment and diversity of user bandwidth and signal-to-noise ratio. Scalable video coding is a popular technique that offers simple and highly flexible solutions for video transmission(More)
Decentralized and dynamic behavior of peer to peer networks along with drawbacks of wireless environment necessitates the development of techniques achieving high reception rates and thus short reception times for the requestor peers. In this paper we discuss, through capacity optimization, the effects of user cooperation on the performance of a generalized(More)
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