Latency-aware joint transmit beamforming and receive power splitting for SWIPT systems
Kumar, Dileep; Alcaraz López, Onel L.; Tölli, Antti; Joshi, Satya (2021-10-22)
D. Kumar, O. L. A. López, A. Tölli and S. Joshi, "Latency-Aware Joint Transmit Beamforming and Receive Power Splitting for SWIPT Systems," 2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), 2021, pp. 490-494, doi: 10.1109/PIMRC50174.2021.9569464
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https://urn.fi/URN:NBN:fi-fe2022012710508
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Abstract
This paper considers a multi-user multiple-input-single-output (MU-MISO) broadcast scenario with power splitting (PS) based simultaneous wireless information and power transfer (SWIPT). Specifically, we propose a novel joint transmit beamforming and receive PS strategy aiming to minimize the total transmit power of the base station (BS) under user-specific latency constraints. We use the Lyapunov optimization framework and derive a dynamic control algorithm to transform the long-term time-average sum-power minimization problem into a sequence of deterministic and independent subproblems. Furthermore, the combinations of coupled and non-convex constraints are handled using semidefinite relaxation (SDR) and fractional programming (FP) techniques. The numerical examples illustrate the trade-offs between average transmit power and harvested power while ensuring the user-specific latency requirements.
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