The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Subspace learning has been widely used in signal processing, machine learning, computer vision and so on. Matrix rank minimizing is a fundamental model. Nuclear norm is a convex relaxation for rank minimizing. In this paper, we propose a polynomial function to smoothen the nuclear norm. Lagrange multipliers method is employed to solve the problem. The optimal solution is obtained by iterative procedure...
In cognitive radio networks (CRNs), secondary users (SUs) may employ network coding to pursue higher throughput. However, because SUs should not interfere with high-priority primary users (PUs), the available transmission time of SUs is usually uncertain, i.e., SUs do not know how long the idle state can last. Meanwhile, existing network coding strategies generally adopt a block-based transmission...
Abstract - In order to identify the technology potential of uplink MU-MIMO, Ericsson developed the LTE TDD test bed according to 3GPP Release 8 specification with simplified MMSE receiver and scheduling schemes. The implemented simplified MMSE receiver can significantly reduce the computation complexity with the restriction that the dominant interference should be monitored by the receiver. This paper...
A least squares estimation algorithm for the azimuth and elevation angles as well as range of a single near-field source impinging on a uniform circular array is proposed. By exploiting the centro-symmetric array configuration, two correlation functions are devised to obtain their closed-form estimates. It is shown that the proposed method gives comparable estimation performance with that of the conventional...
By the definition of fractal, the BP network is proved to be a fractal whose fractal dimension ranges from 2.5 to 5. The relationship between generalization and learning rate of the BP network and the relationship between generalization and fractal dimension of weights are researched in this paper. The results present that the generalization of BP network becomes better with the increasing of the...
In orthogonal frequency-division multiplexing (OFDM) systems, Cyclic Prefix (CP) is added for multi-path interference protection, which is a copy of the last part of the following OFDM symbol; however, this popular symbol structure may cause a virtual peak problem in some OFDM synchronization process. In order to solve the problem, we propose a new preamble structure to improve the synchronization...
Equivalent phase comparison frequency (EPCF) is an important parameter between two frequency signals, and it shows their phase correlation. It is much higher than anyone of the two frequencies, and its period is equal to the group phase shift corresponding two most adjacent phase coincidences between the signals. For example, to two frequency signals with several MHz frequency, their EPCF can be several...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.