A degenerate dual-pump optical parametric chirped-pulse amplifier (OPCPA) for generation of few-cycle intense pulses centered at 1.6 μm is theoretically investigated. By adding the optimized linear chirp to the two pump pulses from Ti:sapphire source and carefully adjusting the delays between the two pumps and seed, the long- and short-wavelength components of the seed pulse are efficiently amp...

A local search Maximum Likelihood (ML) parameter estimator for mono-component chirp signal in low Signal-to-Noise Ratio (SNR) conditions is proposed this paper. The approach combines a deep learning denoising method with two-step estimator. denoiser utilizes residual assisted Denoising Convolutional Neural Network (DnCNN) to recover the structured component, which used denoise original observat...

The aim of this research is to investigate the performance of Welch based de-noising technique for a set of chirp signals corrupted by Gaussian noises. In telecommunications, chirp signals are widely studied, particularly for sonar, radar and spread spectrum applications. However, unlike conventional signals, chirp signals are typical of time varying frequency signals. It sweeps linearly from a...

Higher order statistical features have been recently proved to be very efficient in the classification of wideband communications and radar signals with great accuracy. On the other hand, the denoising properties of the wavelet transform make WT an efficient signal processing tool in noisy environments. A novel technique for the classification of multi-user chirp modulation signals is presented...

This paper compares the performance of phased chirp spread spectrum and direct sequence spread spectrum technique for multiple access over different fading channels. The direct sequence spread spectrum technique is motivated by the inherent interference rejection capability of such spread-spectrum type system, especially in circumstances where immunity against Doppler shift and fading due to mu...

The paper investigates chirp pulse compression as a signal dimension reduction technique in non-coherent Impulse-Radio Ultra-Wideband (IR–UWB) communications. Two common types of non-coherent IR–UWB detection are considered, energy detection of IR–UWB Pulse Position Modulated (PPM) symbols and sample-wise differential detection of Differential Phase Shift Keying (DPSK) IR–UWB symbols, as well a...