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PROJECT TITLE :

Performance Analysis and Optimal Design of Multichannel Equalizer for Underwater Acoustic Communications

ABSTRACT:

Adaptive equalization may be a widely used methodology of mitigating the results of multipath propagation and Doppler spreading in underwater acoustic Communication channels. While the structure of a multichannel equalizer and least-squares-based mostly adaptation algorithm are extensively used in observe, little is thought in how to settle on the number of sensors, separation between them, and lengths of the constituent filters such that the equalization performance is optimized. This paper studies the matter of optimal multichannel equalizer design in the context of your time-varying underwater acoustic Communication channels. In the primary part, the paper presents a theoretical characterization of the equalization performance when the quantity of symbols which will be received within the time period over which the channel can be thought-about time invariant is limited. This result's then used to develop an understanding that the optimal number of equalizer coefficients could be a tradeoff between the minimum mean squared error (MMSE) requirement for extended constituent filters and therefore the insight that the limit on the number of stationary observations additionally limits the quantity of filter coefficients that can be effectively tailored. Within the second part, the paper develops a theoretical model for wideband arrivals impinging upon an array of sensors of the multichannel equalizer. This model is employed to develop an understanding that the optimal sensor separation is a tradeoff between the requirement for long aperture that improves resolution, and the fact that the grating lobes, caused by spatial undersampling, limit the equalizer's ability to estimate the transmitted signal from the received signal.


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