scholarly journals MIMO Wiretap Channel Under Receiver-Side Power Constraints With Applications to Wireless Power Transfer and Cognitive Radio

2016 ◽  
Vol 64 (9) ◽  
pp. 3872-3885 ◽  
Author(s):  
Karim Banawan ◽  
Sennur Ulukus
Keyword(s):  
Cognitive Radio ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Receiver Side ◽  
Wireless Power ◽  
Wiretap Channel ◽  
Power Constraints

scholarly journals Optimizing the wireless power transfer over MIMO Channels

2017 ◽  
Vol 15 ◽  
pp. 181-187 ◽  
Author(s):  
Karsten Wiedmann ◽  
Tobias Weber
Keyword(s):  
Wireless Power Transfer ◽  
Rayleigh Quotient ◽  
Transfer Efficiency ◽  
Mimo Channel ◽  
Power Transfer ◽  
Receiver Side ◽  
Wireless Power ◽  
Mimo Channels ◽  
Optimal Operating ◽  
Power Transfer Efficiency

Abstract. In this paper, the optimization of the power transfer over wireless channels having multiple-inputs and multiple-outputs (MIMO) is studied. Therefore, the transmitter, the receiver and the MIMO channel are modeled as multiports. The power transfer efficiency is described by a Rayleigh quotient, which is a function of the channel's scattering parameters and the incident waves from both transmitter and receiver side. This way, the power transfer efficiency can be maximized analytically by solving a generalized eigenvalue problem, which is deduced from the Rayleigh quotient. As a result, the maximum power transfer efficiency achievable over a given MIMO channel is obtained. This maximum can be used as a performance bound in order to benchmark wireless power transfer systems. Furthermore, the optimal operating point which achieves this maximum will be obtained. The optimal operating point will be described by the complex amplitudes of the optimal incident and reflected waves of the MIMO channel. This supports the design of the optimal transmitter and receiver multiports. The proposed method applies for arbitrary MIMO channels, taking transmitter-side and/or receiver-side cross-couplings in both near- and farfield scenarios into consideration. Special cases are briefly discussed in this paper in order to illustrate the method.

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