Experiment-driven Characterization of Full-Duplex Wireless Systems
Submitted to IEEE Transactions on Wireless Communications 2011. Revised submission on May 2012.
Authors: Melissa Duarte, Chris Dick, and Ashutosh Sabharwal
We present an experiment-based characterization of passive and active self-interference cancellation mechanisms and we analyze the performance of full-duplex wireless communication systems. In particular, we consider passive suppression due to antenna separation at the same node, and active cancellation in analog or digital domain. First, we show that the average amount of cancellation increases for active cancellation techniques as the received self-interference power increases. Our characterization of the average cancellation as a function of the self-interference power allows us to show that for a constant signal-to-interference ratio at the receiver antenna (before any active cancellation is applied), the rate of a full-duplex link increases as the self-interference power increases. Second, we show that applying digital cancellation after analog cancellation can sometimes increase the self-interference, and thus digital cancellation is more effective when applied selectively based on measured suppression values. Third, we complete our study of the impact of self-interference cancellation mechanisms by characterizing the probability distribution of the self-interference channel before and after cancellation.
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New and latest version of the paper. Revisions were made based on comments from reviewers.