Adaptive equalisation for digital communication

The structure of a conventional nonrecursive equaliser is modified so as to provide the equaliser with an automatic means of maintaining a frame of reference at all times. The output of the new equaliser is effectively the same as that of the conventional equaliser; the two equalisers merely differ in the procedure adopted for computing the forward tap weights. Another principal result is the formulation of a linear recursive adaptive equaliser which may be operated with or without a stability constraint. The paper concludes by presenting computer simulation studies of the performance of both nonrecursive and recursive adaptive equalisers.