SECURE MULTICASTING:
We investigate secure multicasting for simultaneous wireless information and
power transfer (SWIPT) in the presence of multiple energy receivers who have
potential to eavesdrop on the messages of information receivers.
Under both, signal-interference-noise ratio (SINR) and harvested energy
constraints, we propose a novel secure multicast design to minimize the total
power by using the techniques of rank-two beam formed Alamouti coding and semi definite
relaxation (SDR).
Fig: System and receiver model
The sufficient conditions are derived under which the proposed secure
multicast design is optimal. We also present the corresponding rank-two Gaussian
randomization procedure to obtain a suboptimal solution when SDR is not tight.
Simulation results are then provided to demonstrate the efficacy of the
proposed design in power saving.
FOR MORE DETAILS Rank-Two Beamformed Secure Multicasting for Wireless Information and Power Transfer
Interferencealignment (IA) is a linear pre-coding strategy that can achieve optimal
capacity scaling at high SNR in interference networks. However, most existing
IA designs require full channel state information (CSI) at the transmitters,
which could lead to significant CSI signaling overhead. There are two techniques,
namely CSI quantization and CSI feedback filtering that reduce CSI feedback
overhead.
We
consider IA processing with CSI feedback filtering in MIMO cellular networks.
We introduce a novel metric, namely the feedback dimension, to quantify the
first order CSI feedback cost associated with the CSI feedback filtering. The
CSI feedback filtering poses several important challenges in IA processing.
First,
there is a hidden partial CSI knowledge constraint in IA pre-coder design, which
cannot be handled using conventional IA design methodology. Furthermore,
existing results on the feasibility conditions of IA cannot be applied due to
the partial CSI knowledge. Finally, it is very challenging to find out how much
CSI feedback is actually needed to support IA processing..
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