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This paper proposes a novel Ka band non-orthogonal multiple access (NOMA) uplink relay system for Lunar farside exploration, where a satellite relay node with the help of NOMA scheme, amplifies and forwards the signal from the Earth Base Station (EBS) to a Lunar rover and a lander. We assume that the signal undergoes shadowed-Rician fading for the source-relay link and Rayleigh fading for the rela...Show More
Adaptive resources allocation algorithm based on modified PSO for cognitive radio system
Yi Yang;Qinyu Zhang;Ye Wang;Takahiro Emoto;Masatake Akutagawa;Shinsuke Konaka
Radio spectrum has become a rare resource due to the rapid development of wireless communication technique. Cognitive radio is one of important techniques to deal with this radio spectrum problem. But the resource allocation in cognitive radio also has its own issues, such as the flexibility of the allocation algorithm, the performance of resource allocation, and so on. In order to increase the fl...Show More
Multi-strategy dynamic spectrum access in cognitive radio networks: Modeling, analysis and optimization
Yi Yang;Qinyu Zhang;Ye Wang;Takahiro Emoto;Masatake Akutagawa;Shinsuke Konaka
Dynamic spectrum access (DSA) based on cognitive radios (CR) technique is an effective approach to address the "spectrum scarcity" issue. However, traditional CR-enabled DSA system employs only single DSA strategy, which might not be suited to the dynamic network environment. In this paper, we propose a multi-strategy DSA (MS-DSA) system, where the primary and the secondary system share spectrum r...Show More
Comparative researches on scattering properties of random surface
Chao Qi;Lei Zhang;Bohan Zhang;Weijian Liu;Ye Wang;Chunling Yang
2015 IEEE 10th Conference on Industrial Electronics and Applications (ICIEA)
Year: 2015 | Conference Paper |
The different parameter characteristics of two types of surfaces with Gaussian distribution and fractal characteristics are discussed, and the outline of two different surface models are given in this paper. By the KA, Gaussian rough surface scattering coefficient is deduced, and the strength of electromagnetic scattering from fractal surfaces is calculated. Two scattering characteristic curves of...Show More
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