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.
In the multi-user multiple-input multiple-output (MIMO) system, orthogonal random beamforming (ORBF) scheme is proposed to serve multiple users simultaneously in order to achieve the multi-user diversity gain. The opportunistic space-division multiple access system (OSDMA-S) scheme performs multiple weighting matrices during the training phase and chooses the best weighting matrix to be used to broadcast...
The orthogonal random beamforming is a practical scheme to increase the throughput of the MIMO system significantly. But the fairness allover the subscribers is the weak point. In this paper, the proportional fair scheduling scheme is introduced to the ORBF scheme for the multi-user MIMO systems and two adaptive proportional fair scheduling schemes are proposed to increase the throughput of the subscribers...
For downlink MU-MIMO systems, The BD-GMD scheme is an optimal precoding scheme. Because the number of simultaneously supportable users of BD-GMD scheme is limited by the mininum of the numbers of transmitting and receiving antennae. In a downlink MU-MIMO system with a large number of users, the base station may choose a subset of users to serve simultaneously in order to maximize the total throughput...
OFDMA femtocells are generally accepted as a very promising solution for indoor coverage with high data rate. However, the lack of systematic schemes to effectively mitigate macro/femtocell hierarchical interference, fully utilize radio resources, provide quality-of-service (QoS) and fairness guarantee among users suffocate the performance realization of femtocells. In this paper, an Adapted Soft...
Femtocell networks have great potential for mobile applications. However, interference due to the co-existence of macrocells and femtocells is a serious problem. In addition, dense femtocells introduce severe inter-system interference. In this paper, a graph theory based dynamic sub-band allocation technique is presented to avoid downlink interference. We model the cells and their mutual interference...
The combined block diagonalization and geometric mean decomposition (BD-GMD) is a preceding scheme that is asymptotically optimal for downlink multi-user multiple-input-multiple-output (MU-MIMO) systems. The number of simultaneously supportable users with BD-GMD is limited by the number of transmitting and receiving antennas. In a downlink MU-MIMO system with a large number of users, the base station...
In MIMO systems, the multi-user diversity is exploited by always scheduling the subscribers whose channel conditions are almost in their peaks. The throughput of system is increased but the fairness is ignored, even some subscribers will be "starvation". In this paper, the fairness of the MIMO systems is concerned and two adaptive proportional fair scheduling schemes based on opportunistic...
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.