Qinghai Yang Huamin Zhu Kyung Sup Kwak Superimposed Training-Based Channel Estimation for MIMO-MB-OFDM UWB Systems. 865-870 2008 17 Journal of Circuits, Systems, and Computers 5 http://dx.doi.org/10.1142/S0218126608004721 db/journals/jcsc/jcsc17.html#YangZK08