Performance Evaluation of a Spectrum-Sensing technique for LDACS and JTIDS Coexistence in L-Band

This paper deals with a cognitive approach able to guarantee the coexistence of new data link for air-ground aeronautical communications LDACS and military JTIDS systems. Future LDACS shall coexist with current systems operating in the same frequency band for this reason coexistence issues must be carefully investigated. In particular JTIDS transmissions can affect the LDACS performance acting as disruptive impulse noise. JTIDS exploits frequency hopping to protect information, hence its interference on LDACS system cannot be foreseen and avoided. In addition the bandwidth of the two signals results to be completely overlapped in case of collision. The disruptive effects of JTIDS interference on LDACS can be mitigated if the collisions can be detected and hence suitable processing techniques can be activated. This paper proposes a method to detect the presence of JTIDS interference exploiting an energy detection spectrum sensing technique based on sliding windows. The performance of the proposed method is presented in terms of missed detection probability of the JTIDS interference and error rate of the LDACS system showing a good behavior