Abstract
In order to operate in full-duplex, the self-interference (SI) caused by the simultaneous transmission and reception should be efficiently mitigated. In this paper, a novel self-interference (SI) channel estimation method for digital SI cancellation is proposed in orthogonal frequency division multiplexing (OFDM) full-duplex system where the SI signal is always strong. Conventional least square (LS) algorithm, which directly removes the cyclic prefix (CP) that contains the useful SI channel information, may degrade the SI channel estimation performance. In contrast to the LS algorithm, the proposed SI channel estimation contains the SI channel information in CP. This indicates that the proposed algorithm can achieve better SI channel estimation. Simulation results also show that the proposed algorithm performs better SI suppression especially when dealing with high self-interference-to-noise-ratio (INR) in full-duplex.
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