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Analog non-linear coding for improved performance in compressed sensing.

机译：模拟非线性编码可提高压缩感测的性能。

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摘要

We propose a framework based on the combination of compressed sensing and non-linear coding that shows excellent robustness against noise. The key idea is the use of non-linear mappings that act as analog joint source-channel encoders, processing the compressed sensing measurements proceeding from an analog source and producing continuous amplitude samples that are transmitted directly through the noisy channel.;Specifically, we first investigate analog joint source-channel coding systems using space-filling curves and MMSE decoding. At the encoder, N source symbols are mapped into K channel symbols directly, achieving either bandwidth compression (N > K) or expansion (N K). Different from previous work in the literature, MMSE decoding instead of ML decoding is considered, and we focus on both high and low channel signal-to-noise ratio (CSNR) regions. By using MMSE decoding, the proposed non-linear coding system clearly outperforms existing systems and presents a performance very close to the theoretical limits, even at low CSNR, as long as the curve parameters are properly optimized.;Second, the proposed non-linear analog coding scheme is combined with compressed sensing. Simulation results show that by combining non-linear coding with compressed sensing, the proposed framework clearly outperforms systems based on stand-alone compressive sensing, and it is readily applicable in practical systems such as imaging.
机译：我们提出了一种基于压缩感测和非线性编码相结合的框架，该框架显示了出色的抗噪声能力。关键思想是使用充当模拟联合源通道编码器的非线性映射，处理从模拟源开始的压缩感测测量值，并产生直接通过噪声通道传输的连续幅度样本。研究了使用空间填充曲线和MMSE解码的模拟联合源信道编码系统。在编码器上，将N个源符号直接映射到K个信道符号，从而实现带宽压缩（N> K）或扩展（N

著录项

  • 作者

    Hu, Yichuan.;

  • 作者单位

    University of Delaware.;

  • 授予单位 University of Delaware.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.S.E.C.E.
  • 年度 2009
  • 页码 75 p.
  • 总页数 75
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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