Intermittently Nonlinear Impulsive Noise Mitigation and Doppler Shift Compensation in UWA-OFDM Systems
| Autor: | Balasubramaniam Natarajan, Solmaz Niknam, Reza Barazideh, Alexei V. Nikitin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
General Computer Science
Computer science Orthogonal frequency-division multiplexing analog nonlinear preprocessor (ANP) 02 engineering and technology Data_CODINGANDINFORMATIONTHEORY Communications system Multiplexing Frequency-division multiplexing symbols.namesake 0203 mechanical engineering Robustness (computer science) orthogonal frequency-division multiplexing (OFDM) 0202 electrical engineering electronic engineering information engineering Electronic engineering Noise control Doppler shift General Materials Science General Engineering 020206 networking & telecommunications 020302 automobile design & engineering underwater acoustic (UWA) symbols Impulsive noise (IN) lcsh:Electrical engineering. Electronics. Nuclear engineering Doppler effect lcsh:TK1-9971 |
| Zdroj: | IEEE Access, Vol 7, Pp 36590-36599 (2019) |
| ISSN: | 2169-3536 |
| Popis: | Impulsive noise (IN) and Doppler shift can significantly degrade the performance of orthogonal frequency-division multiplexing (OFDM)-based underwater acoustic (UWA) communication systems. In this paper, we propose a receiver structure that deals efficiently with both these channel impairments in a coded OFDM-based UWA system. First, an analog nonlinear preprocessor (ANP) is proposed to efficiently detect and mitigate IN in an analog domain. The proposed ANP exhibits intermittent nonlinearity when there is impulsivity. Next, the impact of IN on a two-step Doppler shift compensation approach is quantified. Specifically, the ability of the ANP to improve the robustness of Doppler shift compensation in the presence of IN is highlighted. The performance improvement of the proposed receiver is due to the fact that unlike the other nonlinear methods, the ANP is implemented in the analog domain where the outliers are still broadband and distinguishable. The simulation results also demonstrate the superior bit-error-rate (BER) performance of our approach relative to classic approaches that use blanking and/or clipping for IN mitigation. |
| Databáze: | OpenAIRE |
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