Browsing by Author "Feteiha, M. F."
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Conference paperPublication Metadata only Cooperative inter-vehicular communications in highway traffic(2011) Feteiha, M. F.; Uysal, Murat; Ahmad, A. R.; Electrical & Electronics Engineering; UYSAL, MuratIn this paper, we investigate the performance of a single relay assisted cooperative vehicular network in a highway traffic scenario. Source and relaying vehicles are assumed to be traveling in the same direction with similar speeds. This results in a relative velocity nearly equal to zero and leads to a frequency-flat and time-flat fading in source-to relay link. On the other hand, source-to-destination and relay to-destination links are modeled as doubly-selective fading. To handle spreading in time and frequency, we propose a precoded cooperative scheme to exploit delay and Doppler spreads to our advantage. Under the assumption of amplify-and-forward relaying with orthogonal cooperation protocol, we derive a pairwise error probability expression and demonstrate the achievable diversity gains. We further conduct Monte Carlo simulations to confirm the analytical derivations and present the error rate performance of the proposed scheme with imperfect channel estimation.Conference paperPublication Metadata only Infrastructure-to-vehicle cooperative communications with decode-and-forward relaying(IEEE, 2011) Feteiha, M. F.; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, MuratIn this paper, we consider infrastructure-to-vehicle cooperative communications in which roadside access points use vehicles as relaying terminals. This can be particularly useful in suburban or remote areas where the frequent deployment of roadside access points is not either possible or cost-effective. For the doubly-selective vehicular channel under consideration, we employ a precoded cooperative transmission technique to extract the underlying rich multipath-Doppler-spatial diversity. Under the assumption of decode-and-forward relaying, we derive a pairwise error probability expression and demonstrate the achievable diversity gains. We further provide Monte Carlo simulations to confirm the analytical derivations and provide insight into the error rate performance of infrastructure-to-vehicle cooperative communications.Conference paperPublication Metadata only Multipath-doppler diversity for broadband cooperative vehicular communications(IEEE, 2011) Feteiha, M. F.; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, MuratInitial works on cooperative vehicular communications build upon the assumption of frequency-flat and quasi-static fading channels. This can be justified only for narrowband systems in very slow traffic flows such as in rush-hours. In this paper, we consider doubly-selective (i.e., time- and frequency-selective) vehicular channels and investigate multipath-Doppler diversity for a cooperative vehicular system to extract the underlying rich diversity. Our performance analysis through pairwise error probability derivation shows that, through proper precoding, the proposed system is able to extract maximum available diversity in time, frequency and space. Monte Carlo simulations are further presented to confirm the analytical derivations and corroborate on the analytical results.ArticlePublication Metadata only On the performance of MIMO cooperative transmission for broadband vehicular networks(IEEE, 2015-06) Feteiha, M. F.; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, MuratIn this paper, we investigate the performance of a cooperative vehicular network over a doubly selective fading channel using multiple antennas at source and destination vehicles. Under the assumption of amplify-and-forward (AF) relaying with orthogonal cooperation protocol and Alamouti-type space-time block coding (STBC), we derive a pairwise error probability (PEP) expression and demonstrate the achievable diversity gains. Our results demonstrate that, via proper linear constellation precoding and digital phase sweeping (DPS), the cooperative vehicular scheme is able to extract the maximum available diversity in frequency (through multipath diversity), time (through Doppler diversity), and spatial (through antenna and cooperative diversity) dimensions. We further conduct Monte Carlo simulations to confirm the analytical derivations and present the error rate performance of the vehicular scheme under various mobility conditions and scenarios.Conference paperPublication Metadata only Performance analysis of decode-and-forward multi-hop transmission for vehicular networks(IEEE, 2012) Feteiha, M. F.; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, MuratIn this paper, we consider a multi-hop vehicular network in which the transmitted signal propagates through sequential vehicle hops to arrive to the destination vehicle. We assume doubly-selective channels and employ precoding to take advantage of the underlying temporal and multipath diversities. Our performance analysis through pairwise error probability derivation shows that, via proper precoding, the precoded system is able to extract maximum available diversity in time (through Doppler diversity) and frequency (through multipath diversity) dimensions. Numerical results are further provided to confirm the analytical derivations and provide insight into the error rate performance.