Time Reversal Communications With Channel State Information Estimated From Impedance Modulation at the Receiver
Résumé
We determine the channel state information (CSI) of a multiple-input single-output (MISO) Rayleigh channel without prior communications between the transmitting antennas and the receiver. Our approach solely relies on an impedance modulation at the receiver and therefore circumvents the vexing need of a direct feedback between receiver and transmitters. We extract the wavefront to be transmitted in order to achieve optimal focusing on the receiver from a generalized Wigner-Smith operator (WSO). The latter is evaluated based on the scattering matrix of the transmit array measured in the two possible states of the receiver. Based on the CSI extracted via the WSO, any desired precoding technique can be implemented. Here, we show through in- situ time-domain measurements in a reverberation chamber that our approach closely reaches time-reversal performances in terms of focusing efficiency. We expect our approach to open up new perspectives for future wireless communications and wireless power transfer, including applications in the biomedical domain and electronic warfare.
Mots clés
Antenna arrays
Impedance
Transmitting antennas
Receiving antennas
Antenna measurements
Precoding
Focusing
Timing analysis
Reverberation chambers
Channel state information
Time reversal communications
channel state information
Wigner-Smith operator
multiple-input single-output (MISO)
reverberation chamber
Domaines
Sciences de l'ingénieur [physics]
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