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Analysis of Phase Transition of Penalized Optimization Method in Corrupted Sensing Problem

  

  1. (1. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2019-01-04 Online:2019-06-14 Published:2019-06-14

Abstract: Penalized optimization method is widely used in the corrupted sensing problems with interference and has sharp phase transition. To analyze this phenomenon, we need to study two problems: when they succeed and when they fail. The former has been studied in the literature[1], therefore, this paper study the latter, i.e., the failure case. In our analysis, we present a simple geometry condition, if each element of the sensing matrix has independent normal entries, the geometry condition can be studied using Gaussian process theory, and finally we obtain the threshold for the measurement number below which penalized problems fail with high probability. Moreover, in order to verify this theoretical result, a computable upper bound of the threshold value is given, and the simulation results show that the threshold of the above theoretical results is very sharp.

Key words:  corrupted sensing, penalized optimization problems, phase transition, Gaussian width, compressed sensing, sparse signal recovery

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