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Power control of secondary user is an important issue for cognitive radio systems to protect the transmission of primary users. There are several ways to protect the primary user under the accurate estimation of the channels. In this paper, we focus on the protection of primary user under the imperfect channel estimation. We first gives the mathematical expressions of the outage probability of the...
Channel estimation plays an important role in wireless OFDM systems. This paper studies the channel order estimation problem, which aims to estimate the number of paths of wireless channels. We first introduce the traditional channel order estimation method based on minimum description length (MDL) criterion. We find that the traditional method do not perform well when the number of channel samples...
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