A method of channel polarization, proposed by Arikan, allows us to construct
efficient capacity-achieving channel codes. In the original work, binary input
discrete memoryless channels are considered. A special case of q-ary channel
polarization is considered by Sasoglu, Telatar, and Arikan. In this paper, we
consider more general channel polarization on q-ary channels. We further show
explicit constructions using Reed-Solomon codes, on which asymptotically fast
channel polarization is induced.Comment: 5 pages, a final version of a manuscript for ISIT201