7FRANK R K, BRENDAN J F, HANS A L. Factor graphs and the sum-product algorithm [ J ]. IEEE Trans- actions on information theory,2001,47 (2) :498 - $19.
8LIANG Y M. Channel estimation based on extended kalman filtering for MIMO-OFDM systems [ C ]//Chan- nel estimation based on extended kalman filtering for MIMO-OFDM systems. Wuhan :IEEE Press, 2006 : 1 - 4.