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From the mathematic expression, we can see that sidelobe power of multi-band orthogonal frequency-division multiplexing (MB-OFDM) signal is a function of the data symbols loaded on the sub-carriers. Through the derivation of the minimum of the function, relationships among data symbols, which help to suppress sidelobes, are obtained. Two types of methods, referred as sub-carrier adding (SA) method...
An evaluation method based on support vector regression (SVR) is put forward for the purpose of predicting subjective perceptions of automobile seat comfort. The inputs included fourteen seat interface pressure measures, three anthropometric. The output was an overall comfort index derived from occupant responses to a survey. In process of experimental data analysis, the algorithm of the least squares...
High cost and uncertainty are problems of marketing. Influential online product reviews are more powerful than firm's advertisements. The key of viral marketing is to discover the viruses for efficiently spreading product impressions. In this paper, a model combined with mining techniques and adaptive RFM is proposed to evaluate the influential power of online reviewers. The modified PMI equation...
Due to mathematical limitations, conventional phase-only correlation (POC) technique can only be applied to grayscale images or at most complex images. A full color image must be first converted to a grayscale one before performing the POC, during which the chrominance information has been wasted. In this paper, a novel extension of the POC technique to the quaternion field (QPOC) is proposed, which...
In this paper, we extend the conventional phase-only correlation (POC) technique to the quaternion field (QPOC) and propose a subpixel color image registration algorithm based on the QPOC. Due to mathematical limitations, traditional POC-based registration algorithms can only be applied to grayscale images or at most complex images. A color image must be first converted to a grayscale one before performing...
In order to reduce the size and improve the convergence of PSO (particle swarm optimization) algorithm, an improved PSO algorithm, called TPSO (two particles PSO) algorithm, is presented in this paper. The swarm is only composed of two particles in TPSO algorithm. The algorithm is guaranteed to converge to the global optimization solution with probability one. Its global search ability is enhanced...
A mathematical expression of side-band interferences caused by sub-carriers of multi-band (MB)-OFDM UWB based cognitive radio is derived. Based on this expression, the constraint relationship among transmitted symbols, which is satisfied to suppress the interferences, is obtained. Combined with this constraint, the design process of a type of LDPC-like modulation scheme is described. With modulation...
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