Commutation Signaling - An Antimultipath Technique

Two types of commutation signaling for combating multipath are introduced: signaling, in which the signal set cycles successively among different sets of sigals each; and signaling, in which the signal set at any time consists of members of an alphabet of signals, of which are inactive at any epoch. In both cases, the objective is to remove from use any signal sent recently enough that it is still "ringing" in the multipath channel. We consider the problems of minimization of and , hence the total number signals used; analysis of sets ( is almost uniformly optimal); analysis of the simplest set, i.e., a 2 + 1 set; and presentation of the results of simulation of and signaling through realistic urban/suburban radio channels. Comparison of these simulations to simulations of other antimultipath techniques is also made. The simulation results are due to Kamil [3].