This paper presents a luminosity conserving and contrast enhancing histogram equalization method for color images. The histogram equalization is one of the ordinary methods employed for enhancing contrast in TV and images for consumer electronics where unwanted subjective deterioration are frequently occur. Although there have been many solutions to overcome the drawback of histogram equalizati...

The recurrent canonical piecewise linear (RCPL) network is applied to nonlinear blind equalization by generalizing Donoho's minimum entropy deconvolution approach. We rst study the approximation ability of the canonical piecewise linear (CPL) network and the CPL based distribution learning for blind equalization. We then generalize these conclusions to the RCPL network. We show that nonlinear b...

In this paper we propose two equalization methods for orthogonal frequency-division multiplexing (OFDM) modulation. These methods are intended to be alternatives to the known cyclic prefix equalization (CPE) method, and are derived using ideas from subband identification. The first proposed method is called subband equalization (SBE) and the second one is called enhanced cyclic prefix equalizat...

Recently, overlap frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion which requires no guard interval (GI) insertion was proposed for signal transmission using multi-code direct sequence code division multiple access (DS-CDMA) in a frequency-selective fading channel. Another promising equalization technique is time-domain sliding-window chip equalization (SW...

We consider the revision of a previously derived theoretical framework for the robustness of multi-channel sound equalization in reverberant environments when non-exact equalizers are used. Using results from image model simulations, we demonstrate the degradation in performance of an equalization system as the sound source moves from its nominal position inside the enclosure. We show that perf...

In this paper, we propose the pre-equalization technique for the uplink burst transmission under the intersymbol interference (ISI) channel and the rain attenuation channel existed in the Ka-Band (20~30GHz) of the B-WLL system. We compare the mean-square-error (MSE) convergence properties of standard leastmean-square (SLMS) and discrete cosine transform (DCT)-based transform-domain least-mean-s...

In micro, mini and small satellites because of needs for higher bus voltage and small required battery capacities, batteries are nearly always used in series combinations of multiple cells. When a series string of cells is charged as a group, a single current is imposed on all the cells. However, if the voltages begin to differ, the result is a charge imbalance that can lead ultimately to batte...

This paper presents an outline on the need of equalization in case of GSM systems. The modulation scheme employed in GSM systems is GMSK, which is both power and spectrum efficient, but at the cost of increased intersymbol interference. The effect of inter-symbol interference is more severe in case of multipath fading channel. This obviates the need of near optimum equalization. In this paper f...