6th International ICST Conference on Communications and Networking in China

Research Article

Under-determined Blind Source Separation Based on Sub-band Division

  • @INPROCEEDINGS{10.1109/ChinaCom.2011.6158188,
        author={Feng Tao and Zhu Lidong},
        title={Under-determined Blind Source Separation Based on Sub-band Division},
        proceedings={6th International ICST Conference on Communications and Networking in China},
        publisher={IEEE},
        proceedings_a={CHINACOM},
        year={2012},
        month={3},
        keywords={blind source separation sub-band division cluster analysis},
        doi={10.1109/ChinaCom.2011.6158188}
    }
    
  • Feng Tao
    Zhu Lidong
    Year: 2012
    Under-determined Blind Source Separation Based on Sub-band Division
    CHINACOM
    IEEE
    DOI: 10.1109/ChinaCom.2011.6158188
Feng Tao1,*, Zhu Lidong1
  • 1: National key laboratory of science and technology on communications, UESTC
*Contact email: norman_f@163.com

Abstract

This paper considers the blind source separation in under-determined case, when there are more sources than sensors. So many algorithms based on sparse in some signal representation domain, mostly in Time-Frequency (t-f ) domain, are proposed in recent years. However, constrained by window effects and t-f resolution, these algorithms can not have good performances in many cases. Considering most of signals in real world are band-limited signals, a new method based on sub-band division are proposed in this paper. Sensing signals are divided into different sub-bands by Complementary filters first. Then, classical Independent Component Analysis (ICA) algorithms are applied in each sub-band. Next, the mixing matrix is estimated with cluster analysis algorithms based on each subband’s estimation of mixing matrix. And last, the sub-band signals are recovered using the estimated mixing matrix and the resource signals are reconstructed by combining the related sub-band signals together. This method could recover the source signals if active sources at any sub-band does not exceed that of sensors. This is also a well mixing matrix estimating algorithm. Finally, computer simulation confirms the validity and good separating performance of this method.