Journal
IEEE WIRELESS COMMUNICATIONS LETTERS
Volume 10, Issue 6, Pages 1349-1353Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2021.3067364
Keywords
Interference; Precoding; Baseband; MISO communication; Receivers; Radio frequency; Network coding; Compute-and-forward; energy harvesting; physical-layer network coding (PNC); power splitting; wireless power transfer
Categories
Funding
- General Research Fund from the Research Grants Council, Hong Kong [CUHK 14201118]
- Deep Learning and Cognitive Computing Centre, The Hang Seng University of Hong Kong
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The novel PNC-SWIPT scheme utilized in this research cancels out undesired messages over a finite field during PNC demodulation for information decoding, preserving interfering signals as beneficial energy sources. This scheme achieves superior energy harvesting performance compared to conventional interference mitigation schemes while maintaining the same information decoding performance.
This letter puts forth a novel way to manage interference in simultaneous wireless information and power transfer (SWIPT) systems by utilizing physical-layer network coding (PNC). We consider multi-user multiple-input single-output (MU-MISO) broadcast channels. Unlike the conventional zero-forcing scheme, the PNC-SWIPT scheme introduced in this letter does not eliminate the interfering signals at the receivers. The PNC-SWIPT scheme cancels out the undesired messages over a finite field during PNC demodulation for information decoding (ID). It preserves the interfering signals which are beneficial energy sources for energy harvesting (EH). Simulation results show that the PNC-SWIPT scheme achieves superior EH performance than conventional interference mitigation schemes, such as zero-forcing (ZF) and maximizing EH precoding (Max EH), while maintaining the same ID performance. The performance improvement of the PNC-SWIPT scheme mainly comes from canceling out the interference at the receivers from the aspect of data by PNC, without eliminating the interfering signals which are beneficial energy sources.
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