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a hybrid algorithm for primary user detection in spectrum sensing is proposed in this article, and its performance for different types of primary signals is evaluated and compared. The hybrid algorithm is a combination of the energy detection and the cyclostationarity-based methods. In the majority of related works, the input signal for the energy detection is modeled with a lognormal distribution...
The quality of optical signals is a very important parameter in optical communications. Several metrics are in common use, like optical signal-to-noise power ratio (OSNR), Qfactor, error vector magnitude (EVM) and bit error ratio (BER). While the BER is the final determinant for a system, a measured raw BER is not necessarily useful to predict the final BER after soft-decision forward error correction...
Fiber nonlinearities in WDM systems using linear electronic dispersion precompensation are studied at high bit rates. In contrast to 10 Gb/s systems, only a small performance degradation due to nonlinearities was found at 40 Gb/s.
We derive the statistics of cross-polarization modulation-induced nonlinear crosstalk in polarization-multiplexed DWDM channels and an approximate relation between the degree of polarization and the associated noise terms.
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