In this paper, the quality of the Polarization Shift Keying (PolSK) modulated
signal in a Free Space Optical (FSO) system is analyzed. The atmospheric
channel is statistically modeled with four different distributions, namely,
the Gamma-Gamma distribution, Negative Exponential distribution,
Kdistribution, and I-K distribution. For all four channel models, the
Average Bit Error Rate (ABER) at the receiving side of the system is
determined in an analytically closed form. The results are graphically
presented and discussed in order to determine the impact of certain
parameters on the ABER, i.e., the quality of the received signal in the
PolSK modulated FSO system. These parameters are the Signal-to-Noise Ratio
(SNR), the FSO link distance, the wavelength at which the signal is
transmitted, and the atmospheric turbulence strength.
In this paper, we consider wireless mobile radio communication system with macro diversity reception. Signal is subject to Weibull small scale fading and Gamma large scale fading resulting in system performance degradation. Receiver uses macro diversity selection combining (SC) technique in order to reduce the impact of long term fading effects, and two micro diversity SC branches are used to mitigate Weibull short term fading effects on system performance. Probability density function (PDF), and cumulative distribution function (CDF), as well as level crossing rate (LCR) and average fade duration (AFD) of the SC receiver output signal envelope are evaluated. The obtained expressions converge rapidly for all considered values of Weibull fading parameter and Gamma shadowing severity parameter. Mathematical results are studied in order to analyze the influence of Weibull fading parameter and Gamma shadowing severity parameter on statistical properties of the SC receiver output signal.
In this paper the receiver for the demodulation of M-FSK signals in the presence of Gaussian noise, intersymbol interference and Nakagami fading is considered. The communication systems performance can seriously be degraded by these interferences.
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