524 research outputs found
Fairness Comparison of Uplink NOMA and OMA
In this paper, we compare the resource allocation fairness of uplink
communications between non-orthogonal multiple access (NOMA) schemes and
orthogonal multiple access (OMA) schemes. Through characterizing the
contribution of the individual user data rate to the system sum rate, we
analyze the fundamental reasons that NOMA offers a more fair resource
allocation than that of OMA in asymmetric channels. Furthermore, a fairness
indicator metric based on Jain's index is proposed to measure the asymmetry of
multiuser channels. More importantly, the proposed metric provides a selection
criterion for choosing between NOMA and OMA for fair resource allocation. Based
on this discussion, we propose a hybrid NOMA-OMA scheme to further enhance the
users fairness. Simulation results confirm the accuracy of the proposed metric
and demonstrate the fairness enhancement of the proposed hybrid NOMA-OMA scheme
compared to the conventional OMA and NOMA schemes.Comment: 6 pages, accepted for publication, VTC 2017, Spring, Sydne
On hybrid consensus-based extended Kalman filtering with random link failures over sensor networks
summary:This paper is concerned with the distributed filtering problem for nonlinear time-varying systems over wireless sensor networks under random link failures. To achieve consensus estimation, each sensor node is allowed to communicate with its neighboring nodes according to a prescribed communication topology. Firstly, a new hybrid consensus-based filtering algorithm under random link failures, which affect the information exchange between sensors and are modeled by a set of independent Bernoulli processes, is designed via redefining the interaction weights. Second, a novel observability condition, called parameterized jointly uniform observability, is proposed to ensure the stochastic boundedness of the error covariances of the hybrid consensus-based filtering algorithm. Finally, an example is given to demonstrate the effectiveness of the derived theoretical results
Cross Cultural Comparative Research of Online Consumer Reviews Intentions
A detailed literature review on motives of knowledge sharing in virtual communities is conducted. Moreover, the comparative study on intentions of consumer reviews between Amazon.com and Amazon.cn, based on an online open-ended survey through content analysis, is done. The analytical results show that users contribute their consumption experiences are mainly depended upon social motives, psychological motives and economic motives, which are deeply correlated and influenced by their national culture dimensions
Development Status and Trend of Livestock and Poultry Manure Composting Technology and Equipment
Technical process of livestock and poultry manure composting and various technical equipment for manure composting were briefly described.Development trend of livestock and poultry manure composting technology and equipment was analyzed.It was concluded that technical equipment of livestock and poultry manure composting was an effective way to solve problem of manure treatment in aquaculture.It could promote green development and ecological cycle and provide a reference for design,production and application of livestock and poultry manure composting technology and equipment
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