[1] Kwangwoon Univ, Dept Wireless Commun Engn, Seoul 139701, South Korea
[2] Seoul Natl Univ Technol, Grad Sch NID Fus Technol, Seoul 139743, South Korea
[3] Samsung Elect Co Ltd, Telecommun R&D Ctr, Suwon 433742, South Korea
[4] Kwangwoon Univ, Div Gen Educ Math, Seoul 139701, South Korea