5,919 research outputs found

    Blind joint maximum likelihood channel estimation and data detection for single-input multiple-output systems

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    A blind adaptive scheme is proposed for joint maximum likelihood (ML) channel estimation and data detection of single-input multiple-output (SIMO) systems. The joint ML optimization of the channel and data estimation is decomposed into an iterative optimization loop. An efficient global optimization algorithm termed as the repeated weighted boosting aided search is employed first to identify the unknown SIMO channel model, and then the Viterbi algorithm is used for the maximum likelihood sequence estimation of the unknown data sequence. A simulation example is used for demonstrating the efficiency of this joint ML optimization scheme designed for blind adaptive SIMO systems

    Explaining Variations in the Price of Dairy Quota: Flow Returns, Liquidity, Quota Characteristics, and Policy Risk

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    An econometric model based on the net present value model is used to examine factors that drive the variation of California dairy quota values over a 29-year period. The results suggest the price of quota is based on expected returns, variations in quota owner liquidity, and the risk of policy default. The dominant influence on the variation of the quota price was the historical variation in monthly flow of net benefits from owning quota. This analysis confirms that the rate of return to quota rises in periods of policy uncertainty.adaptive expectations, capitalization of policy, dairy policy, policy risk, quota, Demand and Price Analysis,

    Density-equalizing maps for simply-connected open surfaces

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    In this paper, we are concerned with the problem of creating flattening maps of simply-connected open surfaces in R3\mathbb{R}^3. Using a natural principle of density diffusion in physics, we propose an effective algorithm for computing density-equalizing flattening maps with any prescribed density distribution. By varying the initial density distribution, a large variety of mappings with different properties can be achieved. For instance, area-preserving parameterizations of simply-connected open surfaces can be easily computed. Experimental results are presented to demonstrate the effectiveness of our proposed method. Applications to data visualization and surface remeshing are explored
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