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In this paper, we consider how to achieve optimum throughput when LTE with listen before talk (LBT) shares the unlicensed spectrum with WiFi. Basically, we aim to address two problems: 1) How can WiFi access point (AP) and WiFi station (STN) configure the access parameters to maximize the throughput of their own networks when they have knowledge of the access parameter of LTE? 2) How to jointly tune...
Smart health service means utilizing the integration and collaboration of Internet of Things technology and modern health service technology to realize smart health service featuring ubiquity and personification. In consideration of the requirement and objective of health service and based on the 3S system of Internet of Things, this paper attempts to study and establish a user-centered, health service-driven...
An asynchronous projection and summation circuit is proposed for single photon avalanche diode (SPAD) sensors. Thanks to the efficient interconnection by the asynchronous technique, the circuit can be easily implemented inside 2D SPAD arrays. As a result, the precise summation of the 1b data in one row can be parallel processed for all rows within the same cycle. A test-of-concept chip was fabricated...
In order to maximize the transmission throughput and quality of secondary users (SU) in an opportunistic spectrum access (OSA) systems operating under practical constraints of continuous collisions between the secondary and primary users (PU), we have studied the frame duration behavior and SU's detection frequency under difficult OSA interference and noise conditions. Having analyzed collisions from...
Efficient spectrum detection is essential to Cognitive Radio systems. In this paper, a novel spectrum detection method based on Bayesian compressed sampling is proposed. Firstly, the sparsity of the received signal under fading channel is studied. Then, Bayesian compressed sampling(BCS) is introduced to the spectrum detection for wideband cognitive radio system, and the spectrum components can be...
The availability of the spectrum opportunity to the secondary users is related to the activity of the frequency channels. In this paper, we research the activity of the channels in opportunistic spectrum sharing. A three-state continuous-time Markov chain is proposed to describe the activity of the channel. A formulation under the service traffics for the model is given and the probabilities of the...
In a fading environment, a secondary user may opportunistically transmit with high power when its signal received by the primary receiver is deeply faded. The spectrum access gain can be obtained when there is perfect knowledge of channel sensing at both primary and secondary receivers. In this paper, we investigate the case of imperfect knowledge of channel sensing and explore the impacts on spectrum...
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