Rate-Energy Balanced Precoding Design for SWIPT based Two-Way Relay Systems

Navneet Garg, Junkai Zhang, Tharm Ratnarajah

Research output: Contribution to journalArticlepeer-review


Simultaneous wireless information and power transfer (SWIPT) technique is a popular strategy to convey both information and RF energy for harvesting at receivers. In this regard, we consider a two-way relay system with multiple users and a multi-antenna relay employing SWIPT strategy, where splitting the received signal leads to a rate-energy trade-off. In literature, the works on transceiver design have been studied using computationally intensive and suboptimal convex relaxation based schemes. In this paper, we study the balanced precoder design using chordal distance (CD) decomposition to provide a better rate-energy trade-off, which incurs much lower complexity, and is flexible to dynamic energy requirements. It is analyzed that given a non-negative value of CD, the achieved harvested energy for the proposed balanced precoder is higher than that for the perfect interference alignment (IA) precoder, and the corresponding loss in sum rates via an upper bound. Simulation results also add that the IA schemes based on mean-squared error are better suited for the SWIPT maximization than the subspace alignment-based methods.
Original languageEnglish
JournalIEEE Journal of Selected Topics in Signal Processing
Early online date4 Jun 2021
Publication statusE-pub ahead of print - 4 Jun 2021


  • Relays
  • Interference
  • Precoding
  • Transceivers
  • Decoding
  • Covariance matrices
  • signal processing algorithms


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