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In this paper, a new photonic sampling structure with effective nonlinearity suppression and good signal-to-noise ratio (SNR) performance is proposed. The key feature of this scheme is the polarization-dependent modulators (P-DMZMs) and the sagnac loop structure. Attributing to the polarization sensitive characteristic of P-DMZMs, differences between transfer functions of the fundamental signals and...
Aiming at the fast and accurate measurement of the output frequency of quartz resonant dew point sensor, there is developed a 1-bit fourth-order bandpass (BP) sigma-delta (ΣΔ) modulator to be applied in it. The automatic design and optimization have been both accomplished in the noise transfer function (NTF) and the architecture of 1-bit fourth-order bandpass (BP) sigma-delta (ΣΔ) modulator. It improved...
Synthetic aperture ultrasound is an imaging technique using channel data for every transmit and receive element combinations to achieve two-way focusing at all depths. One of its main drawbacks is reduced penetration depth because of lower reduced transmit power on each transmit event. To mitigate this problem, we employ a spatial prediction filtering technique called the frequency-space prediction...
This work is aimed toward the goal of investigating the influence of different materials on the signal-to-noise ratio (SNR) of passive neural microelectrode arrays (MEAs). Noise reduction is one factor that can substantially improve neural interface performance. The MEAs are fabricated using gold, indium tin oxide (ITO), and chemical vapor deposited (CVD) graphene. 3D-printed Nylon reservoirs are...
A phase-sensitive optical time domain reflectometry sensing system based on Ultra-weak FBG Array using double pulses is proposed. The principle of this sensing system is elaborated. A series of simulations are carried out to optimize the parameters to increase the sensing distance of this system. The parameters contain reflectivity of UWFBG, the interval between adjacent UWFBGs and pulse width. The...
The engineering ideas of the Taguchi method have been widely recognized but the signal-to-noise ratio (S/N ratio) has drawn much criticism. Response surface methods do not use S/N ratios but it is not easy to build an adequate response surface model. In this paper, we propose a relatively simple method for analyzing the data from Taguchi experiments. The proposed approach directly uses the average...
The article develops an information rates estimation method for communication channels with known data delivery routes. Conclusion about the sufficiency of Gaussian probability model usage for describing the distribution of intra-system interference with a large number of simultaneously transmitted signals is made. Derived expressions allow to determinate signal-to-interference ratios for estimating...
The paper is devoted to the implementation on the FPGA of the algorithm for the optimal combining of signals. Described the algorithm, the architecture of the optimal combining block, implemented to a four-element antenna system. The signal-to-noise ratio chosen as a criterion reflecting the efficiency of interference suppression in the reception band (increase of noise immunity). The effectiveness...
The problem of increasing the efficiency of data transmission through a HF radio channel in the case of using passive sounding was studied. The paper presents the main characteristics of the stochastic radio channel with scattering (delay spread, Doppler spread and the signal-to-noise ratio) and communication modem, which have an impact on the efficiency of a communication system. Algorithm for estimating...
This paper discusses implementation of method and tool for determining the signal-to-noise ratio on the input of spacecraft onboard receiver by means of counting spikes in the envelope of additive mixture between signal and narrow-band normal random process. The studies demonstrated feasibility of this signal-to-noise ratio evaluation method usage in satellite communications systems.
Improving the countermeasures against side-channel attacks (SCAs) increases the cost of both designing the countermeasures and evaluating SCA resistance. This may force cryptographic ICs to remain vulnerable. The increased cost is due to an indispensable procedure where a large number of side-channel traces need to be analyzed in order to evaluate the SCA resistance. In this work, a low-cost method...
In this paper, the results of quality and intelligibility assessment of speech masked by stationary and nonstationary noise have been proposed. Subjective speech quality assessment technique has been used to show that white noise masking ability is lower than one for pink and even for brown noise when SNR is less than 0 dB. Two algorithms of nonstationary noise forming have been proposed. They are...
Nowadays, face recognition systems are going to widespread in many fields of application, from automatic user login for financial activities and access to restricted areas, to surveillance for improving security in airports and railway stations, to cite a few. In such scenarios, several architectures based on both 2D image analysis and 3D reconstruction are investigated and proposed in literature...
A new method of analyzing the Asymptotic Bit Error Rate (ABER) performance of Bidirectional Amplify-and-Forward Multiple Relay (BAF-MR) networks is presented in this paper. The analytical expression of the average Signal-to-Noise Ratio (SNR) is derived using both of Arithmetic-Geometric Mean inequality (AGM) and Harmonic Mean (HM). The ABER results obtained from the AGM and HM are then compared to...
The Bit Error Rate (BER) performance of a two-hop Bidirectional Amplify-and-Forward Multiple Relay (BAF-MR) network is analyzed in two ways: the first focuses on analysing Asymptotic BER (ABER) for the applications use high Signal-to- Noise Ratio (SNR) level, and second involved Exact BER (EBER) analysis for all SNR levels. The paper also investigates a new method to increase the accuracy of the ABER...
This paper presents the design procedure for a 2nd_order two-path Discrete-Time Time-Interleaved (DTTI) ΔΣ modulator from a conventional single-loop 2nd-order Discrete-Time (DT) ΔΣ modulator through the use of time domain equations and time-interleaving concepts [1]. The resulting modulator is free from the delayless feedback path and has only one set of integrators. The delayless feedback path issue...
We suggest several techniques for demodulation of frequency-modulated signals. The techniques are compared using the criterion of error rate of a demodulated signal relative to the signal before modulation. The experimental research is conducted for different signal-to-noise ratios.
In this work, we show how a quantum tunneling reflector (QTR) achieves high signal-to-noise ratio (SNR) when properly locked to a 5.8 GHz external signal. The energy cost per bit of the RF device is only 2.9 pt, compared with over 10 J for conventional Bluetooth Low Energy (BLE) transmitters. As a result, sensors communicating through backscatter modulation can increase their communication range at...
With the advent of new technologies every day and with each technology more bandwidth intensive than the previous, The need for some transformative technology to coop with the bandwidth problem is ever growing. The current technologies like LTE uses MIMO, OFDM and coding techniques that have reached their limits and provide an almost theoretical efficiency but they also in the near future may be uanble...
This paper presents a target localization problem based on the time difference of arrival (TDOA) measurements by employing an improved genetic algorithm (GA) for estimation. The weighted least square (WLS) technique is applied as an efficient existing approach. The TDOA target localization problem is formulated as an optimization problem, with a highly nonlinear and multimodal objective function....
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