The importance of the equipment and secondary systems in seismic design and performance evaluation is well recognized and has been the subject of many studies. In all of these studies, earthquake is considered as a single component, and in most of them the primary system is considered as shear building. Most attention has been concentrated on the response of secondary system and its response sp...

OFDM is a technique used in modern broadband wireless communications systems. OFDM has been adopted for wireless standards such as IEEE 802.11a. In this paper, different Power Spectral Density (PSD) curves of OFDM signal based on WLAN with various pulse shapes are presented. OFDM waveform is analyzed in frequency domain response for different modulation techniques such as BPSK, QPSK, 16-QAM, 64...

Consider a received signal consisting of noise and an unknown wave-form that arrives at a sensor through both a direct path and an attenuated and delayed specular path. We show that a commonly-used frequency-domain model for such a signal is valid essentially only under the assumption that the waveform that underwent multipath propagation is band-limited. Furthermore, we derive suucient conditi...

Most of the conventional speech enhancement methods operating in the spectral domain often suffer from spurious artifact called musical noise. Moreover, these methods also incur an extra overhead time for noise power spectral density estimation. In this paper, a speech enhancement framework is proposed by cascading two temporal processing stages. The first stage performs excitation source based...

We demonstrate that the aperture mass as a measure for cosmic shear closely approximates (to better than ≈ 5%) the scaled and shifted power spectrum of the projected mass density. This cosmological weak-lensing information can thus be used to directly infer the projected matter power spectrum with high accuracy. As an application, we show that aperturemass observations can be used to constrain ...

In this paper, a noise estimator with rapid adaptation in a variable-level noisy environment is presented. To make noise estimation adapt quickly to highly non-stationary noise environments, a robust voice activity detector (VAD) is utilized in this paper and it depends on the variation of the spectral energy not on the amount of that. The noise power spectrum in subbands are estimated by avera...

This paper addresses the problem of noise power spectrum estimation. Existing noise estimation methods cannot perform quite reliably when noise level increasing abruptly (e.g., narrowband noise bursts). To overcome this problem, we improve the time-recursive averaging algorithm based on speech presence probability (SPP), by exploiting the sparseness of speech spectrum. Firstly, we utilize the S...

The Large Deviation Principle is derived for several unbounded additive functionals of centered stationary Gaussian processes. For example, the rate function corresponding to 1 T ∫ T 0 X t dt is the Fenchel-Legendre transform of L(y) = − 1 4π ∫∞ −∞ log(1−4πyf(s))ds, where Xt is a continuous time process with the bounded spectral density f(s). Similar results in the discrete-time version are obt...

Bit-interleaved coded modulation (BICM) using (bi-)orthogonal signals is especially well suited for the application in impulse-radio ultra-wideband transmission systems, which typically operate in the power-limited regime and require a very low-complexity transmitter and receiver design. In this paper, we analyze the capacity of BICM using (bi-)orthogonal signals with coherent and noncoherent d...