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The deployment of relay stations in OFDMA cellular networks is a promising solution to provide ubiquitous high-data-rate coverage. However, it makes the resource allocation a more crucial and challenging task. In OFDMA relay-enhanced cellular networks, we formulate the optimal instantaneous resource allocation problem including path selection, power allocation and subchannel scheduling to achieve...
Fair weights have been implemented to maintain fairness in recent resource allocation schemes. However, designing fair weights for multiservice wireless networks is not trivial because users' rate requirements are heterogeneous and their channel gains are variable. In this paper, we design fair weights for opportunistic scheduling of heterogeneous traffic in orthogonal frequency division multiple...
In this paper, a suboptimal resource allocation algorithm is proposed with considered the long-term fairness in the downlink of the multiuser OFDM systems. The intention of this work is to minimize the total transmission power under the constraint of the target system data rate. After formulating the optimization problem, the subcarrier allocation algorithm, considered long-term rate fairness, is...
In this paper, a novel framework is proposed to integrate spectrum (resource) sharing into multihop scheduling in relay-assisted systems. This approach provides an effective solution to minimize the effect of extra resources that are required in multihop transmission. Particularly, this approach can be combined with different topologies of resource scheduling to provide better performance in terms...
OFDMA-based relay-enhanced cellular systems have been proposed as a promising solution for the next-generation wireless communications. The deployment of relay stations (RS) in cellular networks makes resource scheduling a more crucial and challenging task. In this paper, a novel centralized scheduling scheme called centralized scheduling with void filling (CS-VF) is proposed for two-hop relay-enhanced...
AMC (adaptive modulation and coding) is a well-known technique that selects a suitable modulation level and coding rate according to the userpsilas channel quality. The utilization of AMC in DL (downlink) requires the DL channel information of each user to properly select the MCS (modulation and coding scheme) level. However, under a practical OFDMA system environment, it is unsuitable to feed back...
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