- 标题
- 摘要
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- 实验方案
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Joint user and relay selection for relay-aided RF/FSO systems over Exponentiated Weibull fading channels
摘要： In this paper, we investigate the performance of joint user and relay selection scheme for a multi-user relayed network over mixed radio-frequency (RF) and free space optical (FSO) system. In this set-up, the non-line-of-sight (NLOS) RF link is modeled with Rayleigh fading whereas the LOS FSO path is modeled with Exponentiated Weibull (EW) distribution. We assume that the multiple users at source terminal communicate with the destination over multiple decode and forward relays which are located at the rooftops of the buildings to provide a perfect LOS path. In the proposed scheme, all users send pilot signals to the destination through relay terminals and the latter jointly selects the best user and relay based on the maximization of the end-to-end signal-to-noise ratio (SNR). To quantify the performance of the proposed scheme, closed form outage and error probability are derived. Moreover, asymptotic analysis is performed to obtain important system parameters including fading severity, number of users and relays in the system. Finally, Monte-Carlo (MC) simulations are carried out the verify the performance of the considered scheme.
关键词： Exponentiated Weibull fading channel,Joint user and relay selection,Free space optical communication,relay aided transmission
更新于2025-09-04 15:30:14
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[IEEE 2018 10th International Conference on Communication Software and Networks (ICCSN) - Chengdu (2018.7.6-2018.7.9)] 2018 10th International Conference on Communication Software and Networks (ICCSN) - Pilot Power Optimization Based Channel Estimation Method for Optical OFDM/OQAM
摘要： Orthogonal frequency division multiplexing (OFDM) combined with offset quadrature amplitude modulation (OQAM) have become the hot research topic recently. OFDM/OQAM utilizes the specially designed filter bank with localization (TFL) property to promising time-frequency overcome the orthogonal condition for OFDM/OQAM only holds in the real field. Optical OFDM/OQAM systems faced with serious intrinsic imaginary interference (IMI) effect induced by chromatic dispersion (CD) and polarization mode dispersion (PMD), which decreased the transmission performance significantly. In this paper, we proposed a pilot power optimization based channel estimation method to improve the optical system OFDM/OQAM systems. The general pilot design criterion has been proposed in this paper, and numerous pilot structures reported in previous publications have been compared with the proposed method. As demonstrated in the simulation results, the pseudo pilot structures satisfying the proposed structure could obtain optimal pseudo pilot power, which could improve the system robustness against IMI effect and amplified spontaneous emission (ASE) evidently.
关键词： OFDM/OQAM,intrinsic imaginary interference,optical communication,channel estimation
更新于2025-09-04 15:30:14
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Effects of anisotropic oceanic turbulence on the propagation of the OAM mode of a partially coherent modified Bessel correlated vortex beam
摘要： We have studied the impacts of anisotropic turbulence on the orbital angular momentum (OAM) mode of a partially coherent modified Bessel correlated vortex beam propagation in an oceanic channel. In the weak turbulence paraxial channel, a new model of the probability density of OAM modes has been established. Effects of specific parameters of the oceanic turbulence on it have been studied, it is shown that there is an optimizing receiving aperture diameter in the specific interval of the ratio of temperature and salinity (cid:2) , which can reduce the effect of (cid:2) on the normalized energy weight of OAM modes and the reception of fluctuation signal. The effect of oceanic turbulence with higher anisotropy on the OAM signal is weaker than the turbulence possessing lower anisotropy. We can choose the mode carrying lower OAM quantum number to transfer information more efficiently, and we can utilize the OAM mode with large energy level difference between modes and so on to reduce mode interference and enhance the information capacity of optical communication links.
关键词： optical communication,partially coherent modified Bessel correlated vortex beam,propagation,OAM mode,anisotropic oceanic turbulence
更新于2025-09-04 15:30:14