Table 3: Visited nodes in tree search with different fixed branches in 16-QAM modulation 4 × 4 MIMO system.

[ 2 , 3 , 4 , 1 6 ] [ 2 , 2 , 2 , 1 6 ] [ 1 , 2 , 2 , 1 6 ] [ 1 , 1 , 1 , 1 6 ]

Nodes 657 241 177 65