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Dense small cell deployment is promising to accommodate the explosive growth of cellular traffic, anticipated to have a 1000-fold increase in the following decade, driven by the Internet-of-Things (IoT). Different from traditional cellular traffic, emerging IoT applications will generate a large amount of uplink traffic. Considering uplink, how many small cells should be deployed and where they should...
Inter-cell interference (ICI) is always a big issue in orthogonal frequency division multiple access (OFDMA) based communication networks. In this paper, we apply power control to an Improved Fractional Frequency Reuse (IFFR) scheme and investigate the system performance. IFFR scheme divides the whole available resources into two segments: the first segment and the second segment. The first segment...
In this paper, a novel semi-static inter-cell interference coordination scheme based on spectrum pool is proposed for cellular OFDMA systems. In the proposed scheme, the spectrum is divided into three partitions, called major subbands group, minor subbands group and spectrum pool group. The major subbands and the spectrum pool are used by all users in a cell and the minor subbands only can be used...
In this paper, the influence of feedback channel delay on system throughput of the cooperative multi-cell system with adaptive beamforming selection is discussed. On the one hand, multi-cell cooperative processing (MCP) has the potential to boost spectral efficiency and improve fairness among users. However, the traditional centralized multi-cell cooperative scheme, where a central processing unit...
The scheduling problem in downlink of the cooperative multi-cell system is investigated in this paper. Multi-cell cooperative processing (MCP) has the potential to boost spectral efficiency and improve fairness. However, the centralized joint multicell scheduling optimization problem, based on the complete cochannel gain information, has so far been justly considered impractical due to complexity...
The scheduling problem in downlink of the cooperative multi-cell system is investigated in this paper. Multi-cell cooperative processing (MCP) has the potential to boost spectral efficiency and improve fairness. However, the traditional centralized multi-cell cooperative scheme, where a central processing unit is assumed with the global knowledge of all the required downlink channels and user messages...
Impact of the channel estimation error and feedback delay on the throughput of multi-input and multi-output (MIMO) downlink systems is investigated. The dynamic transmission schemes based on TDMA and SDMA with zero-forcing beamforming (ZFBF) are described and their associated system throughput are compared. It is shown that the system performance is sensitive to the channel estimation error, and degrades...
In distributed antenna systems (DAS), the scenario that each antenna port is a multi-antenna array with multi-user is far beyond thoroughly studied. In this paper, the performance of four extended methods for DAS downlink transmission are analyzed and compared in such a scenario, two of which are based on the block diagonalization (BD) algorithm, namely joint BD and intra BD method. The other two...
The cross-layer scheduling problem in multi-antenna broadcast channel with more singe-antenna receivers than transmit antennas and partial channel state information at the transmitter (CSIT) is investigated. A gradient-based scheduling framework is formulated. The proposed scheduling scheme can efficiently support the services with diverse quality of service (QoS) requirements. According to the channel...
In this paper, a radio resource allocation and scheduling algorithm for multi-user MISO-OFDMA systems with downlink zero-forcing beamforming is proposed to efficiently support the diverse quality of service (QoS) requirements of heterogeneous services. According to the channel state information (CSI) and the queue state information (QSI), the proposed algorithm dynamically assigns subcarriers and...
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