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Downlink communication in a cellular network with a cognitive (secondary) cell is considered. In our model, the base station of the cognitive cell knows the messages of the other cell non-causally. We propose a new interference cancellation technique that zero forces the intra-cell interference in the primary cell by the help of the cognitive base station. In addition, as the primary messages are...
This paper discusses collaborative MIMO techniques among nearby base stations, relay stations and user equipments. It is vital to optimize performance and choose collaborative nodes due to unnecessary collision and cost while unlimited abusing of neighbors. After proving the usage possibility of helping node under certain situation, a node choosing protocol model on UE-UE collaborative scenario was...
In this paper, we investigate the linear processing at either base station or relay station in cellular network with a non-regenerative MIMO relay assisting. The purpose of linear processing is to equalize the two-hop fading channel in order to support multiuser transmission in downlink and uplink. Under the transmit power constraint at each station, the closed-form expressions of the suboptimal MMSE...
The data rate of a point-to-point link can be substantially increased by using antenna arrays at both transmitter and receiver. Similar gains can be realized in the downlink of a cellular system with respect to the total cell throughput, if the base station serves multiple single-antenna mobiles simultaneously; however, the maximum rate of each individual user is relatively small then. In this paper,...
Summarizing previous antenna performance studies, an extensive simulation framework for cellular systems and multiple antenna systems is given. Based on it, an urban macrocell scenario is considered for benchmarking with two differently polarized antennas in seven different setups with varying base station and mobile antenna distances. For comparison purposes with the very much scattered data found...
Outdoor MIMO propagation tests were carried out in an urban area in the Danish city of Aalborg in order to investigate some parameters that affect cellular MIMO base-station antennas. We experimentally examined the 2-by-2 MIMO channel responses of base-station arrays with differently-spaced antennas. From these trials, a clear dependence was found between antenna spacing and fading correlation, going...
The various architectures of cooperative communication are among the hottest topics in research and in the new wireless standards. They are applicable both to cellular and ad hoc systems to increase coverage and throughput.
In this paper, a joint distributed space time codes (DSTC) and equalization technique is proposed for cellular communication system in order to obtain the advantages of MIMO system with only one antenna for each mobile user. The proposed scheme can reduce two time slots during the cooperation phase. Simulation results show that the proposed scheme outperforms the conventional DSTC scheme in terms...
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