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The adaptive array antenna is combined with OFDM "orthogonal frequency division multiplexing" as multicarrier technique to combat the flat and frequency selective fading effects at high speed wireless communication. In this paper an optimum weight sets beat informer at time and frequency domain were obtained based on LMS algorithm. Different aspects of(More)
Significant effort has gone into designing robust adaptive beamforming algorithms to improve robustness against uncertainties in array manifold. These uncertainties may be caused by uncertainty in direction-of-arrival (DOA), imperfect array calibration, near-far effect, mutual coupling, and other mismatch and modeling errors. A diagonal loading technique is(More)
A class of adaptive beamforming algorithms was proposed based on directly minimizing the bit-error rate (BER). The popular linear minimum bit error rate (MBER) stochastic beamforming algorithms suffer from low convergence speed and large training data. In this paper, we investigate the use of adaptive stochastic gradient-Newton normalized MBER algorithms in(More)
In this paper, we present a study for the error rate performance of multi carrier direct sequence code division multiple access (MC DS-CDMA) system in conjunction with maximum ratio combining (MRC) over Nakagami-m multipath fading channel. Multiple transmit and receive antenna structures are employed at both the transmitter and the receiver sides to provide(More)
A new low-computational complexity robust adaptive blind multiuser receiver based on a constrained optimization approach with multiple constraints and a quadratic inequality (QI) constraint on the weight vector norm is developed. A diagonal loading technique is required to apply the quadratic constraint where the diagonal loading value is adjusted to(More)
The bit error rate (BER) performance of GMSK in Nakagami fading channels is investigated A simple simulation model using MATLAB software for generating Nakagami variables is described in this paper. Numerical simulation results are presented for the BER performance of GMSK (coherent and non coherent) and MSK (coherent and non coherent) in Nakagami fading(More)
Orthogonal frequency division multiplexing (OFDM) combines the advantage of high achievable rates and relatively easy implementation. In this paper we investigate the combined use of the turbo codes (TC) and the orthogonal frequency division multiplexing in Rayleigh fading channel. The comb-type pilot arrangement with the LS estimator and 1D interpolation(More)
In ad-hoc network, an accurate rate adaptation algorithm is required to enhance the performance of time-varying channel. The existing rate adaptation algorithms can be divided into sender- and receiver-based algorithms. They include receiver base autorate (RBAR), full auto rate (FAR), and opportunistic autorate (OAR). These algorithms rely on the(More)
This paper presents a robust and precise eye detection algorithm on gray intensity face images. Our method combines the strength of two existing methods which are a feature based method and an appearance based method to detect and locate a precise pupil center. It includes the following three steps. First, the feature based method is used. The method uses a(More)
A new computationally efficient real-time blind multiuser receiver based on constrained optimization approach with multiple constraints, inverse QR decomposition (IQRD), and a new fast subspace tracking algorithm is developed in this paper. The IQRD-based recursive least-squares (RLS) algorithm (IQRD-RLS) is very popular because, it has good numerical(More)