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This paper investigate the performance of a proposed optical orthogonal frequency-division multiplexing (OFDM) in a short-range intensity-modulated, direct-detected (IM/DD) optical channel. Because of the high peak-to-average power ratio (PAPR) problem of the OFDM modulation scheme, the beneficial clipping method has been proposed to improve the performance of communication system. In the optical...
In engineering signal processing, parameters of the signal are often submerged by noise. In paper, a method called stochastic resonance (SR) was used to improve the SNR of system. The zero-averaged stochastic noise with normal probability distribution function and adaptable bandwidth could be produced, in which the thermal noise from a resistor is operated as initial noise source and processed by...
Pulse-to-pulse coherent Doppler sonar has been used to provide accurate velocity information, but the occurrence of “range-velocity” ambiguity seriously limits more general applications. Although multi-frequency and dual-time-interval methods have been used to enlarge the range of ambiguity velocity, it remains limited. Therefore, a combined method of conventional and coherent Doppler sonar using...
We propose a novel diversity combining method called local average gain combining (LAGC) that is based on the local average of channel gains. Compared with MRC, which requires the instantaneous complex channel coefficients, and EGC, which requires only the instantaneous channel phases, LAGC requires the instantaneous channel phases but the lo- cal average of the channel gains, implying an implementation...
This paper proposes a novel four phase-shifted sinusoid symbol (PSS-4) signaling technique to relief high-speed wireline backplane transceiver to reduce large intersymbol interference. The four-level pulse amplitude modulation (PAM-4) and other existing amplitude modulation techniques have been widely used to simplify transceiver equalization design for highly dispersive channels. Unfortunately, PAM-4...
Traditional Empirical Mode Decomposition(EMD) used in insulator leakage current de-noising easily leads to mode mixing problem, the Intrinsic Mode Function with mode mixing will lost the original physical meaning. An improved ensemble EMD(EEMD) of noise-assisted data analysis method to solve the problem of mode mixing in EMDs introduced. The performance of EMD and EEMD are compared by signal simulation...
In process of real time acquisition and transmission, the spectral signal obtained by miniature spectrometer may contain noise signals superposed on it. But the traditional denoising methods can't achieve the expected performance because of their limitations. A de-noising method for spectral signal in miniature spectrometer based on Stationary Wavelet Transform (SWT) is proposed. We compared the performance...
In the process of ultrasonic flaw detection to friction welded joints, a number of weak-binding defects are difficult to be correctly detected due to noise pollution. This article studies the semi-soft threshold denoising method of spatial correlation coefficient based on the traditional spatial correlation coefficient de-noising method and threshold de-noising method, and come up with an improved...
In this paper, we study the outage probability performance of a very well-known bidirectional protocol based on decode-and-forward relaying: physical-layer network coding (PNC). We first derive an exact closed-form outage probability expression for the PNC protocol. To provide more insight, we also derive asymptotic outage probability expression. Finally, the validity of the derived expressions is...
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