Trapping set structure of LDPC codes on finite geometries

The trapping set structure of LDPC codes constructed based on finite geometries, called finite geometry (FG) LDPC codes, is analyzed using a geometric approach. In this approach, trapping sets in the Tanner graph of an FG-LDPC code are represented by subgeometries of the geometry based on which the code is constructed. Using this geometrical representation, bounds and configurations of trapping sets of an FG-LDPC code can be derived and analyzed.