Doctoral Dissertations


Peng Xie


"This work investigates the applications of sensor arrays in the areas of acoustic and seismic signal processing. It comprises three papers.

The first paper explores the problem of blind source separation (BSS) for convolutive acoustic signals. It concentrates on the well known permutation and amplitude problems in frequency-domain BSS and proposes a new hybrid approach to solve them. This approach connects the separation processes across all frequency bins, and relies on a novel permutation control unit. This framework could greatly reduce computational load and improve separation performance. Synthesized and real-world experiments demonstrate its efficiency.

The second paper investigates a new array beamforming technique for noise reduction and speech enhancement in cars. The proposed beamformer, called a near-field regionally constrained generalized sidelobe canceller (NRC-GSC), can enhance the capability of both direction and distance discrimination in reverberant environments. Experiments in simulated automobile cabins show good noise and interference suppression for in-car sound sources.

The third paper examines the role that array processing techniques can play in the detection of underground tunnels. It investigates the attenuation analysis of Rayleigh waves (AARW) method, designs a data acquisition scheme, and proposes a new post-processing approach to reduce the influence of subsurface anomalies and instrument sensitivity. It employs array processing techniques and greatly improves the accuracy of traditional tunnel detection methods, allowing engineers to determine tunnel locations easily and reliably. Experimental results verify its effectiveness"--Abstract, page iv.


Grant, Steven L.

Committee Member(s)

Zheng, Y. Rosa
Kosbar, Kurt Louis
Morgan, Ilene H.
Moss, Randy Hays, 1953-


Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering


Missouri University of Science and Technology

Publication Date

Spring 2009

Journal article titles appearing in thesis/dissertation

  • Frequency-domain blind source separation with permutation control
  • Near-field robust generalized sidelobe canceller for in-car speech enhancement
  • Array processing for underground tunnel detection


xi, 108 pages

Note about bibliography

Includes bibliographical references.


© 2009 Peng Xie, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Subject Headings

Acoustooptical devices
Signal processing -- Digital techniques -- Design

Thesis Number

T 9522

Print OCLC #


Electronic OCLC #


Link to Catalog Record

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