Abstract:
An intelligent reflecting surface (IRS) is invoked for enhancing the energy harvesting performance of a simultaneous wireless information and power transfer (SWIPT) aided...Show MoreMetadata
Abstract:
An intelligent reflecting surface (IRS) is invoked for enhancing the energy harvesting performance of a simultaneous wireless information and power transfer (SWIPT) aided system. Specifically, an IRS-assisted SWIPT system is considered, where a multi-antenna aided base station (BS) communicates with several multi-antenna assisted information receivers (IRs), while guaranteeing the energy harvesting requirement of the energy receivers (ERs). To maximize the weighted sum rate (WSR) of IRs, the transmit precoding (TPC) matrices of the BS and passive phase shift matrix of the IRS should be jointly optimized. To tackle this challenging optimization problem, we first adopt the classic block coordinate descent (BCD) algorithm for decoupling the original optimization problem into several subproblems and alternately optimize the TPC matrices and the phase shift matrix. For each subproblem, we provide a low-complexity iterative algorithm, which is guaranteed to converge to the Karush-Kuhn-Tucker (KKT) point of each subproblem. The BCD algorithm is rigorously proved to converge to the KKT point of the original problem. We also conceive a feasibility checking method to study its feasibility. Our extensive simulation results confirm that employing IRSs in SWIPT beneficially enhances the system performance and the proposed BCD algorithm converges rapidly, which is appealing for practical applications.
Published in: IEEE Journal on Selected Areas in Communications ( Volume: 38, Issue: 8, August 2020)
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- IEEE Keywords
- Index Terms
- Power Transfer ,
- Wireless Power Transfer ,
- Intelligent Reflecting Surface ,
- Wireless Information Transfer ,
- Simultaneous Wireless Power ,
- Simultaneous Wireless Information ,
- Multi-user Multiple-input Multiple-output ,
- Simulation Results ,
- Optimization Problem ,
- Phase Shift ,
- Iterative Algorithm ,
- Base Station ,
- Energy Harvesting ,
- Coordinate Descent ,
- Alternating Optimization ,
- Block Coordinate Descent ,
- Coordinate Descent Algorithm ,
- Phase Shift Matrix ,
- Diagonal Matrix ,
- Mobile Edge Computing ,
- Optimization Variables ,
- Maximization Problem ,
- Optimal Solution Of Problem ,
- Channel Estimation ,
- Signal-to-interference-plus-noise Ratio ,
- Nonnegative Definite ,
- Passive Beamforming ,
- Non-convex Problem ,
- Rayleigh Fading
- Author Keywords
Keywords assist with retrieval of results and provide a means to discovering other relevant content. Learn more.
- IEEE Keywords
- Index Terms
- Power Transfer ,
- Wireless Power Transfer ,
- Intelligent Reflecting Surface ,
- Wireless Information Transfer ,
- Simultaneous Wireless Power ,
- Simultaneous Wireless Information ,
- Multi-user Multiple-input Multiple-output ,
- Simulation Results ,
- Optimization Problem ,
- Phase Shift ,
- Iterative Algorithm ,
- Base Station ,
- Energy Harvesting ,
- Coordinate Descent ,
- Alternating Optimization ,
- Block Coordinate Descent ,
- Coordinate Descent Algorithm ,
- Phase Shift Matrix ,
- Diagonal Matrix ,
- Mobile Edge Computing ,
- Optimization Variables ,
- Maximization Problem ,
- Optimal Solution Of Problem ,
- Channel Estimation ,
- Signal-to-interference-plus-noise Ratio ,
- Nonnegative Definite ,
- Passive Beamforming ,
- Non-convex Problem ,
- Rayleigh Fading
- Author Keywords