A new method of nonstationary signal analysis, called time-correlation analysis (TCA), is applied to a class of nonstationary random signals containing time distortion. The method reveals a relationship between the TCA summary statistics and the distortion and leads to two nonparametric estimators for the distortion function. An example is given that demonstrates the application of the TCA meth...

Vector quantization is a popular technique in low bit rate coding of speech signal. The transmission index of the codevector is highly sensitive to channel noise. The channel distortion can be reduced by organizing the codevector indices suitably. Several index assignment algorithms are studied comparatively. Among them, the index allocation algorithm proposed by Wu and Barba is the fastest met...

This note discusses distortion in JFET amplifiers and how to operate a JFET amplifier with low distortion. JFETs are typically used in the first stage of an amplifier where the signal amplitude is so small (microvolts up to maybe a few millivolts) that nonlinear effects are negligible. The distortion becomes significant at larger amplitudes where JFETs are not normally used–at least in open-loo...

1 All Rights Reserved © 2012 IJARCSEE  Abstract— In this paper analysis the performance of a CDMA system by varying the system parameters. CDMA is a popular technology in cellular system due to its superior capacity and performance. In conventional CDMA, obtained better signal to noise ratio by using matched filter because of this rake receiver is used in CDMA to obtain desired signal to noise...

Massive MIMO (multiple-input–multiple-output) is a multi-antenna technology for cellular wireless communication, where the base station uses a large number of individually controllable antennas to multiplex users spatially. This technology can provide a high spectral efficiency. One of its main challenges is the immense hardware complexity and cost of all the radio chains in the base station. T...

This work proposes a novel pre-distortion technique for the quantization noise cancellation of fractional-N frequency synthesizers. The proposed technique utilizes the coordinate rotation digital computer (CORDIC) algorithm to pre-distort the baseband signal of a wireless system with the quantization noise. The pre-distorted signal then modulates the noisy output signal of the fractional-N freq...

A new auralization technique is presented for the objective and subjective assessment of loudspeakers in the large signal domain. On the basis of loudspeaker modeling and the linear, nonlinear and thermal parameters measured on a particular loudspeaker the instantaneous state variables (e.g. sound pressure output, displacement, temperature, ...) are calculated in real time for any input signal ...

In this paper, an effective image demosaicking algorithm, which is based on the correlation among the three primary colors, is proposed for mosaic image with Bayer color filter array (CFA). To reduce the distortion and improve the reconstruction quality, the proposed interpolation method makes full use of the brightness information and the edge information. We design several filters with size o...

For many years there has been confusion surrounding distortion and its measurement. This paper will not discuss in detail the causes of “static” or “dynamic” distortion, or the many misconceptions surrounding their reduction or elimination. This has been done by others extremely well (Cordell 1979, Hofer 1980). Instead, a comparison of the distortion measurement techniques available today and t...

This paper describes algorithms for generating a low-distortion single-tone signal, for testing ADCs, using an arbitrary waveform generator (AWG). The AWG consists of DSP (or waveform memory) and DAC, and the nonlinearity of the DAC generates distortion components. We propose here to use DSP algorithms to precompensate for the distortion. The DSP part of the AWG can interleave multiple signals ...