A simple universal coding scheme for arbitrary cost of code symbol

This paper describes an efficient and simple construction of a universal coding scheme for a noiseless channel with unequal symbol costs, and clarifies its asymptotic performance with respect to stationary sources or stationary ergodic sources. The symbol cost now indicates the time (or space) for the transmission (or storage) of that symbol, and the cost of transmitting (or storing) any code symbol depends only on that symbol. For example, in the Morse code, the dot is shorter in time duration than the dash