Sum-Rate Maximization for Multiuser MIMO Wireless Powered Communication Networks

Sum Throughput Maximization in Multi-Tag Backscattering to Multiantenna Reader

“…This is due to the fact that carrier transmission from R is just to effectively excite (power-up) the tags, and this excitation can be made most efficient when the TX precoder f aligns with the strongest eigenmode of the matrix m∈M Z m . A similar observation was made in context of the precoder designs for efficient downlink energy transfer in WPCN [33], [34].…”

“…There is a striking similarity between WPCN [27], [33], [44] and BSC systems because the downlink energy transfer phase in WPCN to power-up the RF energy harvesting (EH) users has similar objective like the reader's carrier transmission to tags for exciting them. This relation for the downlink transmission leads to a very similar throughput expression for the two systems as can be noted from [27, eq.…”

“…However, due to the above-mentioned similarity between WPCN and BSC settings, the proposed precoder and combiner designs can be applied for the sum-rate-maximization in WPCN, with multiantenna hybrid access point (HAP) and multiple single-antenna EH users, as investigated in [27], [33]. Here, it is worth noting that in contrast to [27], [33], where suboptimal TRX designs were proposed for the multiantenna HAP, the optimal solutions in this work outperform them as shown via numerical results in Section VII-D. The main reason behind the performance enhancement of our proposed TRX designs over the existing ones is the global-optimality of individual designs and asymptotic-optimality of the lowcomplexity-suboptimal joint-ones, as discussed in Sections IV and V, respectively.…”

“…Furthermore, it is worth noting that since the EH devices, in contrast to the tags, have their own RF chain, TRX, and radio signal generation unit, they can involve more sophisticated signal designing, instead of just controlling a scalar BC resem- bling power control. In fact as shown in [33] in multiantenna EH users setting, one needs to design the precoder for them. Also, in WPCN, the optimal time for energy and information transfer phases needs to be optimized.…”

Common Throughput Maximization for UAV-Enabled Interference Channel With Wireless Powered Communications

“…It is envisioned that the WPCN can achieve in principle perpetual operation for future IoT networks [2]- [12]. Recently, extensive research on WPCNs has been conducted under different setups such as multiuser systems [8], relaying systems [9], and interference channels [10], in which techniques such as multi-antenna beamforming [11], power control [12], and user cooperation [13] were used to enhance the performance of both downlink WPT and uplink WIT. However, these prior works mainly focused on conventional WPCNs with APs deployed at fixed locations on the ground, in which both the WPT and WIT performance are fundamentally limited by the severe signal propagation path loss, especially when the distances between APs and IoT-devices become large.…”