1. Faculty of Electrical Engineering and Computing, Department of Wireless Communications, University of Zagreb, Unska 3/XII, HR-10000 Zagreb, Croatia
2. Institute of Computing Technology, Chinese Academy of Sciences, No. 6, Kexueyuan South Road, P. O. Box 2704, HaiDian, Beijing 10080, China
3. Epson Canada Ltd., 3771 Victoria Park Avenue, Toronto, Ontario M1W 3Z5, Canada
4. Department of Computer Science, George Mason University, Fairfax, VA 22030-4444, USA
5. Institute for Neural Computation, University of California, San Diego, 0523, 9500 Gilman Drive, La Jolla, CA 92093-0523, USA