The power consumption of mobile devices is a hot topic these days, and it important to address when developing applications. One the most popular ways measure accessing internal sensors using Android Debug Bridge (ADB). We discovered that measurement frequency may skew readings. Based on this approach we propose our own algorithm for calculating smartphone energy constants — in milliamperes at ...

seismic waves are filtered as they pass through soil layers, from bedrock to surface. frequencies and amplitudes of the response wave are affected due to this filtration effect and this will result in different ground motion characteristics. therefore, it is important to consider the impact of the soil properties on the evaluation of earthquake ground motions for the design of structures. soil ...

All existing training signal designs for channel estimation in OFDM systems assume no frequency offsets. In practice, frequency offset is unavoidable and seriously degrades the performance of OFDM systems. In this paper, we address the problem of designing optimal training signals for SISO OFDM channel estimation in the presence of frequency offsets. First, we present optimal training signals f...

Abstract In direct sequence code division multiple access (DS-CDMA), frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can be applied to exploit the channel frequency-selectivity and therefore much improved bit error rate (BER) performance than using the conventional rake combining. MMSE-FDE requires accurate frequency-domain channel estimation. In this pap...

Frequency stability is one of the most important features of power systems. It is closely dependent on the value of system frequency. In the present day modern power systems, fast and accurate frequency estimation has become quite vital. Anymistake in accurate estimation of frequency may threaten the frequency stability or at least lead to system operation problems. In this paper, a new time-do...

In this paper, we propose a carrier frequency offset (CFO) estimation scheme which is robust to the fractional CFO variation for orthogonal frequency division multiplexing (OFDM) systems. The proposed scheme first performs the envelope equalization process to convert the offset estimation problem to a carrier estimation problem, and then, estimates the integer and fractional parts of CFO by usi...

Antenna array has been used in many fields such as radar, sonar, electron reconnaissance and seismic data processing. The direction-of-arrival(DOA-) estimation of signals impinging on an array of sensors is a fundamental problem in array processing [1–5]. Angle estimation and frequency estimation [6, 7] are two key problems in the signal processing field. The problem of joint DOA and frequency ...

In this paper, the frequency offset estimation schemes robust to the non-Gaussian noise for orthogonal frequency division multiplexing (OFDM) systems are addressed. First, a maximum-likelihood (ML) estimation scheme in non-Gaussian noise is proposed, and then a simpler estimation scheme based on the ML estimation scheme is presented. Numerical results show that the proposed schemes offer robust...