IEICE TRANSACTIONS ON COMMUNICATIONS, vol. E91-B, no. 7, page. 2198 - 2204, 2008-07
IEEE TRANSACTIONS ON SIGNAL PROCESSING, vol. 56, no. 4, page. 1721 - 1726, 2008-04
IEEE COMMUNICATIONS LETTERS, vol. 12, no. 4, page. 292 - 294, 2008-04