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The amplify-and-forward (AF) relay beamforming problems are naturally formulated as indefinite quadratic (nonconvex) optimization programs. The typical methods for solving such optimization problems are to transform them into convex semi-definite programs (SDPs) with additional rank-one (nonconvex and discontinuous) constraints. The rank-one constraints are then dropped to obtain solvable SDP relaxed...
This paper reports the performance of a downlink of a multiuser MIMO system which uses a successive beamforming broadcasting scheme. The investigations take into account the effects of mutual coupling that is present in receiving antennas. It is shown that that the mutual coupling changes the received signals statistic properties and impacts the co-channel interference component. The overall mutual...
Multipath fading effects and co-channel interference are the main limitations facing wireless communication systems. The problem to enhance the capacity of a code-division multiple-access (CDMA) in wireless communication system can be solved implementing an interference management. Many techniques controlling or suppressing an interference in CDMA wireless communication systems by transmitter and/or...
Mutual coupling is well known as an undesirable effect as it degrades the performance of most array signal processing algorithm. Such undesirable effect becomes significant when the antenna element spacing becomes small, which is the case for compact antenna array. Throughout the years, extensive studies from signal processing and communication society have been conducted to compensate such undesirable...
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