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.
This paper investigates the power allocation algorithms based on convex theory for multiuser multi-relay amplify-and-forward (AAF) wireless cooperative network. In this system, there are multiple single-antenna users to communicate with one destination with the help of multiple relay nodes at the same time. In order to guarantee the quality-of-service (QoS) for all the users and reduce the power consumption,...
We present several close-loop four-antenna transmission schemes based on the extended orthogonal space-time block codes (EO-STBCs). Among the proposed schemes, power allocation and phase rotation are taken into account as the partial feedback information to maximize the Frobenius norm of the equivalent channel matrix so as to increase the antenna array gain. We show that the optimal scheme employing...
In this paper, we consider a cognitive radio (CR) system, where a secondary network shares spectrum with a primary network. In the secondary network, a relay station (RS) with multiple antennas performs two-way communications for multiple pairs of secondary users (SUs). In such a CR system, the main point is to provide the best system performance to SUs while protecting primary users (PUs) from excess...
We present a model for multiuser multi-input multi-output (MIMO) high speed downlink packet access (HSDPA) with covariance based linear precoders. The linear procoders, which are designed for single stream detection with rake receivers, are independent of the equalizers employed in multiple antenna receivers to support multistream detection. These symbol based equalizers are designed to minimize the...
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.