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This paper presents a joint estimator for Doppler shift and SNR in wireless communications, which is derived from the relation of level crossing rate (LCR) and signal-to-noise ratio (SNR) in mobile propagations. Computer simulations clearly show a good performance for our joint estimator in a wide range of SNRs and velocities.
This paper researches on knowledge retrieval, reuse and innovation in product conceptual design. First, userpsilas design requirement is translated and decomposed using function-method tree. Second, design case and constraint are used to describe a two-layer process of knowledge retrieval. One is to get the similarity of case function through matching function unitspsila attribute values that is weighted...
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