In this paper, we propose a new model for additive noise based on GARCH time-series in arraysignal processing. Due to the some reasons such as complex implementation and computational problems, probability distribution function of additive noise is assumed Gaussian. In More
In this paper, we propose a new model for additive noise based on GARCH time-series in arraysignal processing. Due to the some reasons such as complex implementation and computational problems, probability distribution function of additive noise is assumed Gaussian. In the different applications, scrutiny and measurement of noise shows that noise can sometimes significantly non-Gaussian and thus the methods based on Gaussian noise will degrade in an actual conditions. Heavy-tail probability density function (PDF) and time-varying statistical characteristics (e.g.; variance) are the most features of the additive noise process. On the other hand, GARCH process has important properties such as heavy-tail PDF (as excess kurtosis) and volatility modeling through feedback mechanism onto conditional variance so that it seems the GARCH model is a good candidate for the additive noise model in the array processing applications. In this paper, we propose a new method based on GARCH using the maximum likelihood approach in array processing and verify the performance of this approach in the estimation of the Direction-of-Arrivals of sources against the other methods and using the Cramer-Rao Bound.
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In this paper, we propose a time-varying multi-path vector channel model for the cellular CDMA-based communication system environment. A modified CMA to use in CDMA system environment is presented. We assume that the angular spread of each source to be large so that fad More
In this paper, we propose a time-varying multi-path vector channel model for the cellular CDMA-based communication system environment. A modified CMA to use in CDMA system environment is presented. We assume that the angular spread of each source to be large so that fading is non-coherent across the elements of the antenna array. The proposed modified CMA algorithm is more suitable in studying the convergence performance and the radiation patterns of uniform linear for tracking signal sources in CDMA mobile systems. Comparing the signal to noise ratio at the output of the algorithm of a uniform linear with the theoretical results proves the efficiency of the proposed algorithm. The BER performance with DBPSK modulation is also compared for CMA and VS-CMA algorithms in linear array.
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