Lower bounds on the capacity of asymmetric two-dimensional (d, /spl infin/)-constraints

We derive lower bounds on the capacity of asymmetric two-dimensional (d, infin)-constraints from bounds on the output entropy of bit-stuffing encoders for general asymmetric (d, infin)-constraints on both the square lattice and the hexagonal lattice. For the (d, infin; 1, infin)-constraint on the square lattice and the (d, infin; 1, infin; 1, infin)-constraint on the hexagonal lattice, we derive exact encoder output entropies which provide even tighter bounds on the capacity of these constraints