In this paper, we devise a highly efficient machine learning-based channel estimation for orthogonal frequency division multiplexing (OFDM) systems, in which the training of estimator is performed online. A simple learning module employed proposed estimator. The process thus much faster and required data reduced significantly. Besides, construction approach utilizing least square (LS) results s...

Among neural models the Support Vector Machine (SVM) solutions are attracting increasing attention, mostly because they eliminate certain crucial questions involved by neural network construction. The main drawback of standard SVM is its high computational complexity, therefore recently a new technique, the Least Squares SVM (LS–SVM) has been introduced. In this paper we present an extended vie...

Wireless channel estimation is one of the challenging problems in Multiple Input Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) wireless systems. The MIMO-OFDM exploits spatial resources and increases reliability capacity However, performance these systems depends on accurate since receivers require perfect Channel State Information (CSI) for coherent signal detection. Thus, a ne...

Neugebauer modeling plays an important role in obtaining end-to-end device characterization profiles for halftone color printer calibration. This paper proposes total least square (TLS) regression methods to estimate the parameters of various Neugebauer models. Compared to the traditional least squares (LS) based methods, the TLS approach is physically more appropriate for the printer modeling ...

The rapid time-variation of a fading multipath environment can impair the performance of multiple-input multiple-output orthogonal frequency division multiplexing (MIMO OFDM). This paper proposes a pilot placement method for MIMO OFDM systems under time-varying channels with the guard band. The time-varying channel is described by complex exponential basis expansion model (BEM). We discuss the ...

In this paper the performance of one of the most widely deployed Wireless Local Area Networks (WLANs) based on IEEE 802. 11a standard has been analyzed using different modulation technique and convolution coding rates. The IEEE 802. 11a standard uses Orthogonal Frequency Division Multiplexing (OFDM) technique. In this analysis the channel estimation is pilot symbol based. A particular method pr...

In order to improve the precision and accuracy of the calibration results, there are two general effects should be considered. One of them is the definition of the mathematical model of the calibration problem with respect to the physical nature of the problem, and the other one is the statistical model of the estimation of the calibration parameters. The estimation procedure is important for b...

Wireless multimedia has created boom in today’s era. It is just a fraction of seconds to get information at any time anywhere. All these because of the development of multicarrier communication system, OFDM, which provides high data rate as well as high speed. With that channel estimation becomes more challenging. In such multicarrier systems the time varying channel is often estimated based on...