Impact and mitigation of narrow-band radar interference in down-link LTE

This paper investigates the impact of radar interference on LTE by directly injecting narrow-band radar waveforms into a state of the art LTE down-link simulator. We show detailed results demonstrating the impact of interference on various parts of LTE signaling including reference symbols. Then we show how the presence of radar interference causes errors in the noise and interference estimates, impacts decoding in the LTE soft decoder, and ultimately leads to erroneously received Sub-frames. We propose a mechanism to combat such interference and improve LTE throughput in the presence of narrow-band radar using selective erasures. We simulate the proposed scheme and show that it is extremely effective in mitigating narrow-band interference and realizing the throughput expected from LTE.