On the Achievable Rate of Bi-Static Modulated Re-Scatter Systems

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In ambient re-scatter<formula><tex>${}^1$</tex></formula> communications, devices convey information by modulating and re-scattering the radio frequency signals impinging on their antennas. In this correspondence, we consider a system consisting of a legacy modulated continuous carrier multiple-input-multiple-output (MIMO) link and a multi-antenna modulated re-scatter (MRS) node, where the MRS node modulates and re-scatters the signal generated by the legacy transmitter. The receiver seeks to decode both the original message and the information added by the MRS. We show that the achievable sum rate of this system exceeds that which the legacy system could achieve alone. We further consider the impact of channel estimation errors under the least squares channel estimation and study the achievable rate of the legacy and MRS systems, where a linear minimum mean square error receiver with successive interference cancellation is utilized for joint decoding.

Original languageEnglish
Article number17243559
Pages (from-to)9609-9613
Number of pages5
JournalIEEE Transactions on Vehicular Technology
Issue number10
Early online date14 Oct 2017
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed


  • Backscatter
  • bi-static channel
  • keyhole channel
  • MIMO
  • modulation coding
  • polyphase coding
  • re-scatter


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