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The self-interference to noise ratio in digital domain decreases as the amount of RF self-interference cancellation increases in full-duplex (FD) communications. The amount of digital self-interference cancellation decreases as the self-interference power in digital domain decreases. The impact of the amount of RF self-interference cancellation on digital self-interference cancellation is analyzed in full-duplex communications. The digital self-interference cancellation analyzed in this paper is based on LS channel estimation. It is shown that the decrease in the amount of digital self-interference cancellation is always less than the increase in RF self-interference cancellation when applying digital cancellation after RF cancellation in full-duplex communications. Applying digital cancellation after RF cancellation is more effective when RF cancellation delivers poor suppression. The performance of digital self-interference cancellation will degrade when RF cancellation achieves large suppression. Introduction Full-duplex (FD) transceiver, which transmits and receives simultaneously at the same frequency band, has the potential to double throughput compared with the conventional time division duplex (TDD) and frequency division duplex (FDD) [1-6]. FD transceiver simultaneously receives the desired signal transmitted from the far-end as well as the self-interference coupled from itself. The self-interference is usually of several orders of magnitude higher than the desired signal because the latter crosses much longer distance than the former. Therefore, the fundamental issue of FD transceiver is the mitigation of the self-interference. The existing self-interference cancellation (SIC) mechanisms include antenna cancellation, RF cancellation, and digital cancellation [7-12]. The amount of digital self-interference cancellation when applied after RF self-interference cancellation decreases as the self-interference suppression achieved by RF cancellation increases when the total self-interference received power is fixed. This leads to the natural question regarding how to allocate the amount of RF and digital self-interference cancellation to make the total amount of self-interference cancellation maximum. The experimental results in [13] show that the effectiveness of digital self-interference cancellation decreases with the increase in the amount of RF self-interference cancellation and digital cancellation is more effective when applied selectively based on measured values. It should be noted that the impact of the amount of RF self-interference cancellation on digital self-interference cancellation in full-duplex communications has not been analyzed in theory yet. 186 Advances in Computer Science Research (ACRS), volume 54 International Conference on Computer Networks and Communication Technology (CNCT2016)

Impact of the Amount of RF Self-interference Cancellation on Digital Self-interference Cancellation in Full Duplex Communications