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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...
Robustness enhancement scheme in Serial RapidIO (SRIO) interconnect is proposed to overcome the performance degradation caused by noise and Electromagnetic Interference (EMI). The main idea of this scheme is the adaptive speed transition and mode conversion. Adaptive speed transition can improve average throughput and reduce delay in high Bit Error Rate (BER) environment. Mode conversion is to conquer...
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, the downlink zero-forcing beamforming strategy under perfect channel state information at the transmitter (CSIT) for the case of random packet arrivals is investigated. Under this setting, the relevant fairness criterion is the stabilization of all buffer queues which guarantees a bounded average delay for all users. In case of queue stability is the goal, it can be shown that allocating...
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