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In this paper, we propose an adaptive cluster-centric small cell network with cooperative caching and transmission design, in which small base stations (SBSs) are grouped into disjoint clusters and in-cluster cache space is utilized as an entity. We design a combined caching scheme where part of the available cache space is reserved for caching the most popular content in every SBS, while the remaining...
A novel RB-WC-FI-FB (robust worst-case frequency invariance forward-backward) wideband beam former is proposed in this paper. It is developed to improve the robustness against estimation errors of direction of arrival (DOA) and limited sample number, as well as reduce the number of constraints. By incorporating forward-backward estimation and worst-case performance optimization method into the linearly...
In cognitive radio applications, the cognitive users should find the spectral hole before it access to the spectrum band licensed to primary users. In order to improve spectral efficiency, wideband spectrum sensing is required for cognitive radio systems. In several environments, some weak primary users (such as microphone signal) are coexisting with strong primary users. In these cases, the weak...
8times200-Gbit/s polarization-division multiplexed DQPSK transmission system over 1200 km of SSMF has been successfully demonstrated. BER well below 1E-4 has been achieved for CS-RZ-DQPSK signal with an OSNR of 23.29 dB.
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