Section: New Results

Flexible Radio Front-End

The innovative Wake-Up radio architecture proposed by the Socrate team, based on a classical WiFi standard with a specific OFDM pattern, has been deeply studied in theory and simulations [1] , [25] , [24] . Great enhancements on the sensitivity study, the choice of identifiers and the comparison of the energy consumption relative to classical systems have led to the development of a first prototype (ongoing work).

In the development of wideband OFDM Full-Duplex systems, [33] proposes an analysis of the impact of the thermal noise on the quality of the self-interference cancellation in such systems. A method is proposed to reduce the impact on the bit-error-rate by increasing the level of certain parts of the preamble in each frame. [35] add to the analog RF cancellation proposed previously a stage of digital cancellation enabling to increase more the performance of Full-Duplex terminals.

Furthermore, [34] extend the study to a dualband Full-Duplex systems, enabling the very promising combination of Full-Duplex and carrier aggregation. The proposed structure being sensitive to IQ impairments, a digital mitigation algorithm is also designed.

In collaboration with Orange labs, [32] analyses the requirements of an SDR gateway for urban networks collecting SRD (short range devices) information. This study is particularly focused on the ADC resolution, showing that the required resolution in realistic scenarios is too high, therefore emphasizing the need to develop specific hardware techniques.

For the development of the CorteXlab testbed, lots of radio hardware and propagation constraints had to be taken into account [15] , [14] . Moreover,[36] had proposed a first implementation of Full-Duplex on USRPs which is expected to be deployed on this tesbed.

Another testbed dedicated to the measurement of the energy consumption of radio devices was also designed and implemented.