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Performance Evaluation Of Non-Uniform Modulation Of Ofdm Subcarrier In The Underwater Acoustic Environment

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Abstract:

Partial FFT demodulation is a newly-emerging technique to mitigate the inter-carrier interference (ICI) of orthogonal frequency division multiplexing (OFDM) systems over time varying underwater acoustic channels. In this letter, we extend the partial FFT demodulation method for a single-input single output (SISO) configuration to the multiple-input multiple-output (MIMO) case. By assuming no channel knowledge, we design an adaptive algorithm which performs sliding-window channel estimation, partial FFT combining and data detection across subcarriers iteratively. Furthermore, a new parameter ?residual ICI span? is introduced to counteract the post-combining ICI and provide a better system performance. Here we are using relay selection over OFDM for underwater acoustic system.

Existing Method:

  • Base station to end user transmission

Drawbacks:

  • Due to spectrum scarcity the user couldn?t be allocated with sufficient power over the network to enhance data transmission on time secured in nature

Proposed Method:

  • OFDM has been enabled for the communication in multi path direct LOS communication over the chlorophyll concentrated regions

Under water Relaying Channel:

Methodologies:

  • Single-input single output (SISO)
  • PAM,4,16,64 M-Array QPSK,DPSK
  • Estimated depth sea interference

Advantages:

  • Deployed for higher performance than tradition perfect feedback-based systems.

Software Requirement:

  • MATLAB 10 or above versions

References:

[1] M. Stojanovic and J. Preisig, ?Underwater acoustic communication channels: Propagation models and statistical characterization,? IEEE Commun. Mag., vol. 47, no. 1, pp. 84?89, Jan. 2009.

[2] P. Kumar, V. Trivedi, and P. Kumar, ?Recent trends in multicarrier underwater acoustic communications,? in Proc. IEEE Underwater Technology (UT), Feb. 2015, pp. 1?8.

[3] B. Li, S. Zhou, M. Stojanovic, L. Freitag, and P. Willett, ?Multicarrier communication over underwater acoustic channels with nonuniform Doppler shifts,? IEEE J. Ocean. Eng., vol. 33, no. 2, pp. 198?209, Apr. 2008.

[4] G. Leus and P. van Walree, ?Multiband OFDM for covert acoustic communications,? IEEE J. Sel. Areas Commun., vol. 26, no. 9, pp. 1662? 1673, Dec. 2008.

[5] S.-J. Hwang and P. Schniter, ?Efficient multicarrier communication for highly spread underwater acoustic channels,? IEEE J. Sel. Areas Commun., vol. 26, no. 9, pp. 1674?1683, Dec. 2008.

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