An underwater environment acoustic signal detection scheme employing dual-loop adaptive noise canceling based on analog network coding

This paper proposes an underwater environment acoustic signal detection scheme employing dual-loop adaptive noise canceling (ANC) based on analog network coding. For example, the proposed scheme can detect underwater environment acoustic signals in the presence of underwater acoustic communications (UWAC), where the UWAC communicate their information at the same frequency band in order to save frequency resources. The first loop of the proposed scheme adaptively cancels the transmitted signals of the UWAC based on analog network coding. The second loop of the proposed scheme adaptively cancels the received signals of the UWAC by means of the inverse modulated signals of the decisions for the received signals. Finally, computer simulation results confirm that the proposed dual-loop scheme outputs the detected signals of the underwater environment acoustic signals at high signal to noise power ratio (SNR).