نتایج جستجو برای: ترکیبات پیچیده فلزی cma
تعداد نتایج: 46344 فیلتر نتایج به سال:
By using a generalized cost function, a modified constant modulus algorithm (CMA) that allows polarization demultiplexing and equalization of polarization-switched QPSK is found. An implementation that allows easy switching between the conventional and the modified CMA is described. Using numerical simulations, the suggested algorithm is shown to have similar performance for polarization-switch...
BACKGROUND Multiple lines of evidence indicate a strong genetic contribution to autism spectrum disorders (ASDs). Current guidelines for clinical genetic testing recommend a G-banded karyotype to detect chromosomal abnormalities and fragile X DNA testing, but guidelines for chromosomal microarray analysis have not been established. PATIENTS AND METHODS A cohort of 933 patients received clinic...
This paper addresses computer-mediated advertising (CMA) as a source of brand image. It is proposed that CMA contributes to brand image by facilitating unique consumer-brand relationships. The 'quality' of these relationships largely depend on how advertisers leverage interactivity and computer intelligence during interaction. An analogy is drawn between CMA and service encounters and a framewo...
BACKGROUND The diversity in the perceived prevalence, recovery, and risk factors for cow's milk allergy (CMA) necessitated a large-scale, population-based prospective study. OBJECTIVE We sought to determine the prevalence, cross-reactivity with soy allergy, and risk factors for the development of CMA. METHODS In a prospective study the feeding history of 13,019 infants was obtained by means...
Increasing the speed of convergence of the constant modulus algorithm for blind channel equalization
The constant modulus algorithm (CMA) is an excellent technique for blind channel equalization. Recently signed error version of CMA (SE-CMA) and dithered signed error version (DSE-CMA) have been proposed which afford overall computational efficiency. We propose three different error functions for faster convergence. This would be essential for communication systems, which cannot afford a high s...
The covariance matrix adaptation (CMA) is one of the most powerful self adaptation mechanisms for Evolution Strategies. However, for increasing search space dimension N , the performance declines, since the CMA has space and time complexity O(N2). Adapting the main mutation vector instead of the covariance matrix yields an adaptation mechanism with space and time complexity O(N). Thus, the main...
The paper proposes a low-complexity concurrent constant modulus algorithm (CMA) and soft decisiondirected (SDD) scheme for fractionally spaced blind equalization of high-order quadrature amplitude modulation channels. We compare our proposed blind equalizer with the recently introduced state-of-art concurrent CMA and decision-directed (DD) scheme. The proposed CMA+SDD blind equalizer is shown t...
OBJECTIVE To evaluate the association between aberrant right subclavian artery (ARSA), with or without additional risk factors for aneuploidy or ultrasound abnormality, and results of chromosomal microarray analysis (CMA). METHODS This was a multicenter study of fetuses diagnosed with ARSA that underwent genetic analysis by CMA, all samples being analyzed in the same laboratory. Clinical inve...
Chronic metabolic acidosis (CMA) is associated with decreased NaCl reabsorption in the proximal tubule (PT). However, the effect of CMA on Na(+) transport in the distal tubule (DT) and collecting duct (CD) is poorly understood. Rats were placed in metabolic cages and had access to water (control), 0.28 M NH(4)Cl, or 0.28 M KCl solutions in a pair-feeding protocol for 5 days (5d). Metabolic acid...
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