Fayadh, R. , Malek, F. , Fadhil, H. , Saudin, N.. "Improved Rake Receiver Based On the Signal Sign Separation in Maximal Ratio Combining Technique for Ultra-Wideband Wireless Communication Systems". World Academy of Science, Engineering and Technology, Open Science Index 84, International Journal of Electronics and Communication Engineering, (2013), 7(12), 1654 - 1658.