The proposed index modulation encodes information in the unordered selection of orthogonal phase codewords on RIS subarrays to enable backscatter communication alongside MIMO radar operation without changing the beampattern or requiring CSI at the reader.
Symbiotic radio: Cognitive backscattering communications for future wireless networks,
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Waveform Index Modulation for Backscatter Communications in RIS-Based MIMO Radars
The proposed index modulation encodes information in the unordered selection of orthogonal phase codewords on RIS subarrays to enable backscatter communication alongside MIMO radar operation without changing the beampattern or requiring CSI at the reader.