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ln this paper, a distributed beamforming algorithm is proposed for downlink multicell network when the intra-cell local channel state informations (CSIs) are available at each base station (BS). The proposed algorithm includes three parts, firstly, an algorithm is proposed to estimate the direction vectors of the inter-cell local channels. The algorithm above utilizes a set of random orthogonal bases...
Device-to-device (D2D) multicast communication is a useful way to improve the communication efficiency of user equipments which are located close to each other. In this paper, the frequency resource sharing problem of D2D multicast communications underlying single frequency network (SFN) system is investigated. Firstly, to avoid the interference between D2D and cellular communication and without consuming...
In this paper, an iterative algorithm for decentralized beamforming with internal penalty function is proposed. This algorithm utilizes the property that a stationary point corresponding to local maximum of the objective function is found when gradient is zero. The convergence of the proposed algorithm is proved. The simulation results show that the proposed algorithm is more robust against intra-cell...
In this paper, the resource sharing problem of device-to-device (D2D) communications underlying evolved multimedia broadcast multicast service (EMBMS) system is investigated, and a novel round- robin resource sharing algorithm (RRSA) is proposed. To avoid the interference between D2D user equipments (DUEs) and cellular user equipments (CUEs) without consuming more frequency resources, in this study,...
Device-to-Device (D2D) multicast underlaying a cellular infrastructure has recently investigated. In this paper, we propose a new interference management scheme for D2D multicast to increase the overall capacity and improve resource utilization. The proposed scheme includes two steps. First, in order to mitigate the interference from D2D multicast transmission to cellular networks (CNs), a dynamic...
We propose a cognitive cooperative scheme based on cognitive relays in the downlink of a time division multiple access (TDMA) system. Cognitive relays utilize the spectrum holes detected via the spectrum detection to relay information, which can share the downlink slots through the frequency-division orthogonal transmission. Therefore, no extra system resources (slots or channels) are allocated for...
To avoid inter-cell interference effectively and to improve the performance of cell-edge users, a novel cellular architecture, termed Cellular Architecture Based on Sector Relay (CASR), is proposed in this paper, and two frequency planning schemes based on CASR are investigated. In CASR, fixed relays equipped with directional antennas are located at the vertex of the hexagonal cell for sectorization,...
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