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Sending a laplacian source using hybrid digital-analog codes

Abbasi, F ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/TCOMM.2014.2327213
  3. Abstract:
  4. In this paper, we study transmission of a memoryless Laplacian source over three types of channels: additive white Laplacian noise (AWLN), additive white Gaussian noise (AWGN), and slow flat-fading Rayleigh channels under both bandwidth compression and bandwidth expansion. For this purpose, we analyze two well-known hybrid digital-analog (HDA) joint source-channel coding schemes for bandwidth compression and one for bandwidth expansion. Then we obtain achievable (absolute-error) distortion regions of the HDA schemes for the matched signal-to-noise ratio (SNR) case as well as the mismatched SNR scenario. Using numerical examples, it is shown that these schemes can achieve a distortion very close to the provided lower bound (for the AWLN channel) and to the optimum performance theoretically attainable bound (for AWGN and Rayleigh fading channels) on mean-absolute error distortion under matched SNR conditions. In addition, a non-linear analog coding scheme is analyzed, and its performance is compared to the HDA schemes for bandwidth compression under both matched and mismatched SNR scenarios. The results show that the HDA schemes outperform the non-linear analog coding over the whole CSNR region
  5. Keywords:
  6. Additive white Laplacian noise (AWLN) channel ; Non-linear analog coding ; Bandwidth ; Bandwidth compression ; Channel coding ; Encoding (symbols) ; Gaussian noise (electronic) ; Laplace transforms ; Rayleigh fading ; White noise ; Analog coding ; Bandwidth compression/expansion ; Hybrid digital-analog (HDA) codes ; Joint source-channel coding ; Laplacians ; Signal to noise ratio
  7. Source: IEEE Transactions on Communications ; Vol. 62, issue. 7 , 2014 , p. 2544-2557
  8. URL: http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6822532&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel7%2F26%2F6860331%2F06822532.pdf%3Farnumber%3D6822532