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In this paper, a novel cell architecture in relay-enhanced Orthogonal Frequency-Division Multiple Access (OFDMA) cellular networks is proposed. By spatially reusing the spectrum in the same cell, the frequency efficiency is enhanced, while the co-channel interference is reduced by dividing the coverage of both the base stations (BSs) and the relays into sectors, thus the MSs at the cell edge can attain...
The downlink capacity of cellular networks is known to be strongly limited by inter-cell interference. In order to mitigate this interference, a number of frequency reuse schemes have recently been proposed. In this paper, we compare the potential capacity gains of these schemes accounting for the random nature of traffic.
Inter-cell Interference (ICI) is a key issue in orthogonal frequency-division multiple access (OFDMA) systems. Since OFDMA was proposed to be used in next generation networks several schemes have been investigated for mitigating the ICI. One of the techniques that promises improvement in reducing ICI is partial frequency reuse (PFR). In this paper we investigate a flexible bandwidth allocation (FBA)...
Spatial interference alignment among a cluster of base stations is considered as a technique to mitigate inter-cell interference in the downlink of a large cellular network using OFDMA. We derive an expression for the mutual information achieved by clustered base station cooperation together with a zero-forcing receiver. Numerical performance results with throughput gains of up to 30% with respect...
The wireless relay mesh network (WRMN) is designed to provide robust and fault tolerant communications between relay and user nodes in broadband wireless networks. In this paper, we study interference aware resource allocation in OFDMA based WRMNs and the effects of spatial reuse on throughput. We propose an interference aware subcarrier assignment (IASA) algorithm to allocate subcarriers to links...
In this paper we present an interference aware phased scheduling strategy for a soft frequency reuse (SFR) interference coordination scheme in an Orthogonal Frequency Division Multiple Access (OFDMA) network. It groups the active user terminals (UT) in a low and high signal-to-interference plus noise ratio (SINR) group and picks UTs from both groups in each scheduling round to optimally exploit the...
We consider the uplink of a multi-cell orthogonal frequency division multiple access (OFDMA) system that employs multiple (M > 1) receive antennas and maximum ratio combining at the base station. We propose a model that captures the impact of intercell interference coordination on the modulation and coding scheme dependent bit error rate (BER) performance. We analyze this model in two steps. First,...
This paper provides analysis of the inter cell interference coordination problem in multicell OFDMA systems. In order to reduce the interference without losing much frequency resources in each cell, cell users are partitioned into two classes, namely interior and exterior users. Frequency resources are universally used in all interior cells' areas whereas users of exterior zones have a frequency reuse...
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