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In this study, a steady and comparatively smooth Ni-P coating on the surface of diamond/Al composite substrate was fabricated by electroless plating, which can outstandingly improve solderability of the composite. By controlling the deposition time, we obtained the growth curve of the Ni-P coating, and as a result we can adjust the thickness of the coating. The solderability was tested by soldering...
In this paper, we propose an approach for detecting primary user emulation attacks in cognitive radio networks. Cognitive radios (CRs) have been proposed as a promising solution for improving spectrum utilization via opportunistic spectrum sharing. In a CR network environment, primary (licensed) users have priority over secondary (unlicensed) users when accessing the wireless channel. Thus, if a malicious...
The optimality of the maximum a posteriori probability(MAP) bit detection for differentially encoded M-PSK signals over static non-ISI channels is emphasized, in which the demodulator computes loglikelihood ratio (LLR) of individual coded bits directly, but not via transforming those successive detected symbolspsila LLR into bitspsila LLR as the conventional methods. As a representative, the designs...
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