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It is shown that implementation of the method of space-time division multiple access with the individual space-time processing of subscriber stations signals which is reduced to the use of group elements of adaptive antenna array and the establishment of parallel procedures of assessing values of vector of weighting coefficients on the number of simultaneously working stations.
Various facets of cognitive radio technology have been studied in recent years. However, one possibility that is only thus-far marginally investigated is the ability to perform secondary access at the same time, band and location as ongoing primary transmissions through beamforming to secondary users. Clearly one reason why this has not been at the forefront of research is that it could imply a significant...
In cellular system, user terminals (UTs) are sometimes suffered from the attenuation of target signal from base stations (BSs) and severe interferences from adjacent cells, and their influence is serious particularly in the cell edge. This paper considers the performance improvement of multi-antenna cellular system under such a bad situation utilizing cooperative works of BSs and relay stations (RSs)...
This paper exploits the use of location information of wireless terminals to improve the performance of a beamforming system and support multiple access. Based on a system providing real-time 3D coordinate information of all terminals in the environment, a novel feedback-free multi-user scheduler is proposed. It chooses a set of angularly separated wireless terminals for simultaneous transmission...
Consider a multi-cell relay-assisted time-division uplink system, i.e. one active user per time slot per cell with a relay serving that user. In this paper, we are concerned with heterogeneous networks (networks with unbalanced spatial loads) and we are interested in techniques for increasing the data rate in a congested cell. We propose inter-cell relay cooperation with single-cell decoding as one...
This paper studies efficient complex valued matrix manipulations for multi-user STBC-MIMO decoding. A novel method called Alamouti blockwise analytical matrix inversion (ABAMI) is proposed for the inversion of large complex matrices that are based on Alamouti sub-blocks. Another method using a variant of Givens rotation is proposed for fast QR decomposition of this kind of matrices. Our solutions...
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