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To achieve higher spectral efficiency in future wireless networks, small cells have been conceived to be deployed over conventional macrocell networks, generating heterogeneous networks (HetNets). However, interference between different tiers of HetNets is the main bottleneck for high spectral efficiency. Spectrum access, including spectrum deployment and channel access, is one of the most powerful...
Deploying femtocells over the conventional macrocell network is a promising way to increase network capacity, whereas the main bottleneck is the interference between the femtocell and macrocell tiers. Recent research has proposed many effective methods for cross-tier interference mitigation, but unfortunately, the optimal spectrum access scheme remains unknown. In this paper, a cognitive spectrum...
The simulation of spacecraft collision breakup debris is an important research content of spacecraft collision breakup problem. Based on existing models and other research results, functional requirements of simulating spacecraft collision breakup debris were analyzed, and its module composing and computing flow was designed. This software was implemented by MATLAB, VC & STK program techniques...
Electrically Controlled Rotor (ECR) is a new concept rotor system which was brought forward at the beginning of the 21st century. A control strategy of the ECR system is given out in this paper. An adaptive blade pitch control strategy of the ECR system is proposed, which is based on the adaptive filter with least mean aquare (LMS) algorithm. A secondary path on-line identification method with random...
In this paper, we analyze the propagation of orthogonality error for fast Rayleighpsilas quotient based adaptive noise subspace algorithm (FRANS). First, we examine the propagation of orthogonality error for the numerically unstable FRANS in the mean and in the mean-square sense. Then, numerically stable FRANS with householder transformation (HFRANS) is studied through simulation as an improvement...
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