101 citations · 363 across the 33 of their papers we have counts for
5 papers · 2 filters
A Blind Time-Reversal Detector in the Presence of Channel Correlation
Zhong Zheng, Lu Wei, Jyri Hämäläinen +1
A blind target detector using the time reversal transmission is proposed in the presence of channel correlation. We calculate the exact moments of the test statistics involved. The…
Locally Best Invariant Test for Multiple Primary User Spectrum Sensing
Lu Wei, Prathapasinghe Dharmawansa, Olav Tirkkonen
We consider multi-antenna cooperative spectrum sensing in cognitive radio networks, when there may be multiple primary users. A noise-uncertainty-free detector that is optimal in t…
Approximation to Distribution of Product of Random Variables Using Orthogonal Polynomials for Lognormal Density
Zhong Zheng, Lu Wei, Jyri Hämäläinen +1
We derive a closed-form expression for the orthogonal polynomials associated with the general lognormal density. The result can be utilized to construct easily computable approxima…
On the Exact Distribution of the Scaled Largest Eigenvalue
Lu Wei, Olav Tirkkonen, Prathapasinghe Dharmawansa +1
In this paper we study the distribution of the scaled largest eigenvalue of complexWishart matrices, which has diverse applications both in statistics and wireless communications.…
Spectrum Sensing in the Presence of Multiple Primary Users
Lu Wei, Olav Tirkkonen
We consider multi-antenna cooperative spectrum sensing in cognitive radio networks, when there may be multiple primary users. A detector based on the spherical test is analyzed in…