Fourier Optics and Optical Signal Processing

Multistage adaptive filtering for identification of page-oriented volume holographic memories

[+] Author Affiliations
Nazim Burak Karahanoglu

The Scientific and Technological Research Council of Turkey, Information Technologies Institute, Kocaeli 41470 Turkey

Mehmet Keskinoz

Sabanci University, Faculty of Engineering and Natural Sciences, Istanbul, 34956 Turkey

Opt. Eng. 49(2), 028201 (March 02, 2010). doi:10.1117/1.3314294
History: Received June 16, 2009; Revised December 15, 2009; Accepted December 17, 2009; Published March 02, 2010; Online March 02, 2010
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Page-oriented volume holographic memories (POVHM) is a quadratically nonlinear channel because of the intensity detection at its output. To combat the two-dimensional intersymbol interference in a high-capacity POVHM, equalization of the output intensity array requires identification of the quadratic and possibly spatially varying impulse response of the channel. Although conventional adaptive filtering schemes are devised for identification of linear channels, they also require the length of the impulse response to be known in advance. In this work, we develop multistage quadratic normalized least mean square (LMS) (MS-QNLMS) adaptive filtering and multistage Volterra normalized LMS (MS-VNLMS) filtering to estimate the channel under quadratic nonlinearity, which do not require the support or length of the impulse response to be known a priori. By employing extensive numerical experiments, we provide performance and convergence comparisons of the proposed schemes with respect to a true-order quadratic estimator. We also show that MS-QNLMS filtering has less computational complexity and converges faster and more robust to various channel parameters as compared to MS-VNLMS.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Nazim Burak Karahanoglu and Mehmet Keskinoz
"Multistage adaptive filtering for identification of page-oriented volume holographic memories", Opt. Eng. 49(2), 028201 (March 02, 2010). ; http://dx.doi.org/10.1117/1.3314294


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