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This paper studies user-specific clustering for a downlink cloud radio access network (C-RAN), where a central unit (CU), connected to all base stations (BSs) via limited-capacity backhaul links, coordinates the BSs to form cooperative clusters for every user. By taking into account the training overhead for channel estimation in C-RAN, we design the clustering scheme aimed at maximizing the avera...Show More
Coordinated multi-point (CoMP) transmission can significantly improve the spectral efficiency of cellular networks. To reduce the training overhead and the complexity for implementing CoMP, an effective way is to divide base stations (BSs) into cooperative clusters. However, with disjointed clusters, the cluster-edge users suffer from inter-cluster interference. In this paper, a scheme is designed...Show More
In this paper, we strive to improve the energy efficiency (EE) of downlink base station (BS) cooperative transmission systems by switching off some BSs and antennas and allocating power to the users according to the required data rate and channel of each user. To show the potential of EE gain, we first propose an optimal dynamic switching off scheme using instantaneous channel information that max...Show More
Energy-efficiency (EE) has been considered as an important goal for designing future high throughput cellular networks. In this paper, we strive to improve the EE of downlink coherent cooperative transmission systems by adaptively selecting the transmitting mode, i.e., by switching off some antennas and base stations (BSs) according to the required data rate of each user and then by allocating pow...Show More
Coordinated multi-point transmission (CoMP) joint processing (CoMP-JP) is a promising technique for supporting high spectral efficiency in future cellular systems. However, this technique requires high-capacity backhaul links for connecting multiple base stations (BSs), which leads to high deployment costs. CoMP coordinated beamforming (CoMP-CB) needs less backhaul capacity, but with lower maximal...Show More
Coordinated multipoint (CoMP) transmission has been widely recognized as a spectrally efficient technique in future cellular systems. To exploit the abundant spatial resources provided by the cooperating base stations (BSs), however, considerable training overhead is required to acquire the channel information. To avoid the extra overhead outweighing the cooperative gain, we propose a method that ...Show More
Coordinated multi-point transmission (CoMP) has been widely recognized as a promising technique for improving spectral efficiency in future cellular systems. However, it may require high-capacity backhaul links, which can increase expense. In this paper, we study the cooperative transmission method with limited-capacity backhaul. Downlink CoMP transmission requires the exchange of information betw...Show More
Base stations (BSs) cooperative transmission provides high spectrum efficiency for cellular networks, where the performance gain of each user depends on its location. When training overhead is considered, however, a user jointly served by multiple BSs may even achieve lower net rate than with non-cooperative transmission. In this paper, we consider semi-dynamic mode selection for users. We first d...Show More
Cooperative base station transmission, also known as coordinated multi-point (CoMP)transmission, is a promising technique to improve spectrum efficiency of cellular networks. however, coherent CoMP joint transmission needs huge training overhead which will reduce the effective data transmission rate. In this paper, a downlink transmission mode selection method is proposed, aiming at improving cell...Show More
Base station cooperation transmission, which is also known as coordinated multi-point (CoMP) transmission, is a promising technique to improve system spectrum efficiency in cellular networks, especially for multiple antenna systems. However, the performance gain is significant only when cooperative base stations can gather channel state information (CSI) from all their serving users and can share ...Show More