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In this paper, the problem of spectrum sensing for cognitive radios is investigated when the decision statistic is computed using Welch Overlapped Segmented Averaging (WOSA). A novel analysis is presented using the performance measures which are the probability of false alarm and the probability of detection. First, we present a novel investigation of the hermitian form of Welch's estimate. Using...
In this paper we evaluate the sensing performance by using a MRC based blind channel combining scheme in low SNR environment, to sense the low level primary signal in cognitive radio with multiple antenna. MRC based blind channel combining for multiple antennas is known as achieving almost the same performance compared with an optimum MRC which has full knowledge of the channels if we apply it in...
Spectrum sensing is one of the most challenging issues in cognitive spectrum sensing. In this paper, an improved eigenvalue based algorithm is proposed using Random Matrix Theory. This improved method overcomes the effect of noise uncertainty exiting in other method, for the good nature of Random Matrix Theory. In addition, it has better detecting probability in both AWGN and fading channels. Also...
Spectrum sensing is a key component in cognitive radio networks, where secondary users are able to use the frequency bands when they sense that no primary users are using those bands. In this paper, we investigate an energy detector scheme used to deal with the issues related to spectrum sensing and interference avoidance for multinode cognitive radio networks. Then, an extensive analysis on cooperative...
Cooperative spectrum sensing is attracting more attention in cognitive radio networks. This paper proposes a fully distributed consensus-based cooperative spectrum sensing scheme to cope with both fixed and random bidirectional connections among secondary users. In the proposed scheme, secondary users can maintain coordination based on only local interactions without a centralized common receiver...
In this paper, we propose a cognitive radio-based multi-user resource allocation framework for mobile ad hoc networks using multi-carrier DS CDMA modulation over a frequency-selective fading channel. In particular, given pre-existing communications in the spectrum where the system is operating, in addition to potential narrow-band interference, a channel sensing and estimation mechanism is provided...
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