Self-correcting multi-channel Bussgang blind deconvolution using expectation maximization (EM) algorithm and feedback

ISAR autofocus;Blind deconvolution;Bussgang blind equalization

Tang, Sze Ho ; Electrical and Computer Engineering

University:Georgia Institute of Technology

Department:Electrical and Computer Engineering

关键词: ISAR autofocus;    Blind deconvolution;    Bussgang blind equalization;   

Others  :  https://smartech.gatech.edu/bitstream/1853/33975/1/tang_sze_h_200812_phd.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

A Bussgang based blind deconvolution algorithm called self-correcting multi-channel Bussgang (SCMB) blind deconvolution algorithm was proposed. Unlike the original Bussgang blind deconvolution algorithm where the probability density function (pdf) of the signal being recovered is assumed to be completely known, the proposed SCMB blind deconvolution algorithm relaxes this restriction by parameterized the pdf with a Gaussian mixture model and expectation maximization (EM) algorithm, an iterative maximum likelihood approach, is employed to estimate the parameter side by side with the estimation of the equalization filters of the original Bussgang blind deconvolution algorithm. A feedback loop is also designed to compensate the effect of the parameter estimation error on the estimation of the equalization filters. Application of the SCMB blind deconvolution framework for binary image restoration, multi-pass synthetic aperture radar (SAR) autofocus and inverse synthetic aperture radar (ISAR) autofocus are exploited with great results.