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Response delay problem and measurements of such delays have been reported in Part I. The response delay has a negative impact on the accuracy of spectrum sensing, which is the cornerstone of cognitive radio. In this paper, single-user prediction of channel state is proposed to minimize the negative impact of response delays caused by hardware platforms. Specifically, a modified hidden Markov model...
Spectrum sensing detects the availability of the radio frequency spectrum and it is essential to cognitive radio. Cooperative spectrum sensing conducted among multiple secondary users has the potentials for solving the hidden terminal problem and achieving a better performance. In this paper, an approach for cooperative spectrum sensing based on Q-learning is proposed. Real-world Wi-Fi signals measured...
Multiple antennas have become a common component of wireless networks, improving range, throughput, and spatial reuse, both at the link and network levels. At the same time, carrier sensing is a widely used method of improving spatial reuse in distributed wireless networks, especially when there is limited coordination among non-communicating nodes. While the combination of carrier sensing and multiple...
The following topics are dealt with: solders; electronics packaging; LTCC layers; power semiconductor devices; wire bonding; printed circuit board; LED; electronic module reliability; CMOS integrated circuit design; sensors; antennas; electric engineering education; and radio network.
This paper proposes a novel structure of multi-antenna spectrum sensing to solve the problem of the SNR Wall under harsh channel condition like deep fading. Our objective is to exploit the spatial diversity largely with resort to singular value decomposition (SVD) of the auto-correlation of the parallel signal flows. To evaluate its performance, the ROC of the proposed scheme is deduced in close form...
Antenna architecture is proposed that uses an active FE shield and proximity sensors to provide a mechanism to control the near field energy distribution of a wireless device based on the proximity to the operator. This system has advantages over passive shields in that the antenna system is responsive to its environment, adjusting the near field energy distribution to minimize energy deposition into...
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