Index of EWU Authors - East West University

Abstract of Published Papers 2008Sciences and EngineeringIEEE Signal Processing Letters, Vol. 15, pp. 305-308, 2008Noise Robust Multichannel Frequency-Domain LMS-type Algorithms for BlindChannel IdentificationM. A. Haque*, M. K. Hasan**AbstractA number of multichannel least mean square (LMS)-type algorithms have been proposed inthe literature to identify single-input multi-output finite impulse response channels. All ofthese algorithms share the common characteristic of good initial convergence followed by arapid misconvergence in the presence of noise. This misconvergence characteristic is due tothe nonuniform spectral attenuation of the estimated channel coefficients as reported in someresearch results. In this letter, we formulate a novel cost function that inherently opposes suchspectral attenuation resulting from the noisy update vector. We show analytically that thegradient of the proposed penalty term enforces uniform distribution of the estimated channelspectral energy over the entire frequency band and thus contribute to ameliorating themisconvergence of these multichannel algorithms in the presence of noise. The robustness ofthe proposed algorithm is verified using numerical examples for different channels in a widerange of signal-to-noise ratios.* Department of Electrical and Electronic Engineering, Bangladesh University ofEngineering and Technology, (BUET) Dhaka, 1000, Bangladesh.** Department of Electrical and Electronic Engineering, East West University, Dhaka 1212.Bangladesh (Pro-VC, East West University) .Email address: khasan@ewubd.edu41