Method for generating at least one backscattering zone of an ambient signal and/or for receiving a backscattered ambient signal

A system comprising

• at least one source configured to emit an ambient radio signal for generating:
• at least one backscattering zone, by at least one transmitter device and to at least one receiver device, of the ambient radio signal emitted by the at least one source, the backscattering zone forming a backscattered ambient signal, and/or
• at least one reception zone, by the at least one receiver device, of said backscattered ambient signal;
• the at least one source comprising means for:
• determining an emission constraint that, when the emission constraint is applied by the at least one source to emit the ambient radio signal, the at least one backscattering zone is generated in which a received electromagnetic power is greater than a determined threshold, called backscattering threshold, and/or the at least one reception zone is generated in which the received electromagnetic power is less than a determined threshold, called reception threshold;
• and
• transmitting the ambient radio signal, by said at least one source, with respect to said emission constraint;
• and
• at least one of:
• the at least one transmitter device;
• or
• the at least one receiver device.

A source comprising:

• means for determining an emission constraint;
• means for transmitting an ambient radio signal, with respect to said emission constraint, in a frequency band, called a transmission bandwidth, wherein said transmitting under the emission constraint generates:
• at least one backscattering zone in which a received electromagnetic power is greater than a determined threshold, called a backscattering threshold, and/or
• at least one reception zone in which a received electromagnetic power is less than a determined threshold, called a reception threshold;
• wherein the means for determining is configured to:
• estimate, assuming channel reciprocity, a propagation channel between the source and at least one terminal a position of which is intended to be included in the backscattering or the reception zone, from at least one pilot sequence transmitted by said at least one terminal in a frequency band, called a working band included in the transmission bandwidth of the source,
• calculate, as a function of the propagation channel estimated, a precoder capable of generating in a region of at least one said terminal electromagnetic power greater than the backscattering threshold or less than the reception threshold according to which the position of the terminal is intended to be included in the backscattering or the reception zone,
• said emission constraint corresponding to use by the source of the precoder for transmitting the ambient radio signal.