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Joint Source Channel Coding with Hybrid Digital Analog Codes in the Presence of Intereference

Varasteh, Morteza | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42726 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Behroozi, Hamid
  7. Abstract:
  8. In this thesis we consider transmitting an analog Gaussian source over an AWGN channel in the presence of an interference completely known at the transmitter intwo cases: 1) Compression bandwidth with interference uncorrelated with the sourceand 2) Matched bandwidth channel in the presence of interference correlated withthe source to be transmitted. We study joint source-channel coding schemes basedon hybrid digital-analog (HDA) codes. After providng a brief review, we will proposetwo new schemes for the ?rst case and one novel scheme for the second case. Aswe will see both schemes for the ?rst case achieve the optimal mean-squared error(MSE) distortion. The proposed HDA schemes can cancel the interference of thechannel and obtain the “optimum performance theoretically attainable” (OPTA) ofthe additive white Gaussian noise (AWGN) channel with no interference in the caseof bandwidth compression. We also provide performance analysis in the presenceof signal-to-noise ratio (SNR) mismatch where we expect HDA schemes performbetter than strictly digital schemes. In the second scheme we will see that thissetting naturally generalizes the problem of sending a single Gaussian source, in the case of bandwidth-matched, with uncorrelated interference in which the Costascheme is optimal. We analyze this scheme to obtain achievable (mean-squared error)distortion-power tradeo?. For comparison, we also obtain a new outer bound for theachievable distortion-power tradeo? that performs better than previous outer bounds.Using numerical simulations, we demonstrate that, the proposed two layered codingscheme consisting of analog and digital coding layers, performs well compared toother provided Joint Source Channel Coding (JSCC) schemes
  9. Keywords:
  10. Interference ; Correlation ; Joint Source and Channel Coding ; Hybrid Digital-analog (HDA)Codes

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