| Popis: |
To protect our receivers against spoofing, intrusion or simply reduce interference, we proposed a multi-layered architecture which can be integrated into a receiver chain by modifying the analog and digital parts. Indeed, Our project addresses analog circuits coupled with digital approaches to immunize a radio against any intentional electromagnetic attack (intelligent jammer or not), or radio interference. In this manuscript, we only consider the innovative analog part of our system which is based on non-linear bijective functions generated by electronic circuits. In fact, we have developed an electronic system characterized by a non-linear bijective function that can be implemented using analog electronic components, and its inverse function can be implemented in the digital part of our reception chain. The main purpose of these two functions is the protection of an interesting weak signal existing in the vicinity to an annoying but very strong signal which will risk saturating the Low Noise Amplifier (LNA), and therefore the target signal can no more be chased after the analog to digital convertor (ADC). Certainly, in conventional transmission systems, we generally seek to eliminate or to reduce the impact of non-linear effects of certain electronic components or devices; however, our proposed scheme introduce a specific non-linear function in ordre to detect the presence of signals with weak Signal to Interference plus Noise Ratios (SINR). This manuscript presents our study and discusses various aspects related to the proposed new nonlinear scheme. |
