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As conventional single-layered network cannot satisfy the increasing demand in high-speed indoor data service, femtocell has been introduced to provide higher network capacity and better user experience. However, the downlink transmit signal from femtocell base station (FBS) may result in severe cross-tier interference to macrocell users (MUE). To address this problem, we propose a dynamic femtocell...
Due to high data rate requirement for indoor communication, femtocells have been proposed as a potential solution to increase not only indoor radio coverage but also system capacity. However, there is co-channel interference that affects the system throughput seriously due to high density of femtocells in urban environment. In this paper, an adaptive frequency allocation (AFA) for LTE network is proposed...
In OFDMA system, inter-cell interference (ICI) and multi-service requirement are challenging problems. Previous cell-level schemes ignored different QoS requirement of multi-service. Meanwhile, most of them only considered complex cell edge part separation but simplified cell inner part allocation to eliminate ICI, but refined inner part allocation could eliminate ICI effectively. To solve this problem,...
As a key technology in future mobile communications system, OFDMA has efficient frequency utilization and strong robustness to frequency selective fading, however it's sensitive to synchronization errors. Although effects of synchronization errors on crossed timeslot's performance have been widely investigated in TDD/CDMA system, little work has done in TDD/OFDMA system. This paper analyzes the effects...
For real time service, not only the data rate, but also the packet delay should be guaranteed. In this paper, by exploiting the queue status information and channel status information, a novel framework of joint spatial-frequency scheduling for real time service in MIMO-OFDMA system is proposed, and some joint spatial-frequency scheduling algorithm is proposed based on modified largest weighted delay...
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