In this paper we study the multiple input multiple output (MIMO) orthogonal freqency division multiplexing (OFDM) Gaussian Broadcast Channel (BC). Several fundamental problems are considered: The maximization of a weighted sum of rates and the dual minimization of sum power subject to rate requirements. Further we study the combined problem of weighted rate sum maximization under minimum rate r...

Interference is assumed to be one of the main barriers to improving the throughput of communication systems. Consequently, interference management plays an integral role in wireless communications. Although the importance of interference has promoted numerous studies on the interference channel, the capacity region of this channel is still unknown. The focus of this thesis is on Gaussian interf...

THIS PAPER IS ELIGIBLE FOR THE STUDENT PAPER AWARD. It has been shown recently that the dirtypaper coding is the optimal strategy for maximizing the sum rate of multiple-input multiple-output Gaussian broadcast channels (MIMO BC). Moreover, by the channel duality, the nonconvex MIMO BC sum rate problem can be transformed to the convex dual MIMO multiple-access channel (MIMO MAC) problem with a ...

Although several palmprint representations have been proposed for personal authentication, there is little agreement on which palmprint representation can provide best representation for reliable authentication. In this paper, we characterize user’s identity through the simultaneous use of three major palmprint representations and achieve better performance than either one individually. This pa...

Recently observed c-axis optical sum rule violations indicate non-Fermi liquid in-plane behavior. For coherent c-axis coupling, the observed flat, nearly frequency independent c-axis conductivity σ 1 (ω) implies a large in-plane scattering rate Γ around (0, π) and therefore any pseudogap that might form at low frequency in the normal state will be smeared. On the other hand incoherent c-axis co...