121,949 research outputs found
Interference detection in gaussian noise
Interference detection in gaussian noise is proposed. It can be applied for
easy detection and editing of interference lines in radio spectral line
observations. One need not know the position of occurence or keep track of
interference in the band. Results obtained on real data have been displayed.Comment: 10 pages, 11 figure
Performance of DPSK Signals with Quadratic Phase Noise
Nonlinear phase noise induced by the interaction of fiber Kerr effect and
amplifier noises is a quadratic function of the electric field. When the
dependence between the additive Gaussian noise and the quadratic phase noise is
taking into account, the joint statistics of quadratic phase noise and additive
Gaussian noise is derived analytically. When the error probability for
differential phase-shift keying (DPSK) signals is evaluated, depending on the
number of fiber spans, the signal-to-noise ratio (SNR) penalty is increased by
up to 0.23 dB due to the dependence between the Gaussian noise and the
quadratic phase noise.Comment: 15 pages, 2 figure
CRLBs for Pilot-Aided Channel Estimation in OFDM System under Gaussian and Non-Gaussian Mixed Noise
The determination of Cramer-Rao lower bound (CRLB) as an optimality criterion for the problem of channel estimation in wireless communication is a very important issue. Several CRLBs on channel estimation have been derived for Gaussian noise. However, a practical channel is affected by not only Gaussian background noise but also non-Gaussian noise such as impulsive interference. This paper derives the deterministic and stochastic CRLBs for Gaussian and non-Gaussian mixed noise. Due to the use of the non-parametric kernel method to build the PDF of non-Gaussian noise, the proposed CRLBs are suitable for practical channel environments with various noise distributions
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