Patent ID: 7260155
Filing Date: 2007-08-21
Classification: H04B,H04L

Abstract:
1. A method of encoding a first n-bit data word for transmission in a communications system, the communications system including a transmitter, a receiver, a communications channel and a first subset of n-bit data words, wherein each data word of the first subset is assigned a unique subset of one or more coded data words, the method comprising: determining a second n-bit data word, of the first subset of n-bit data words, that corresponds to the first n-bit data word; selecting a first coded data word, from a unique subset of coded data words associated with the second n-bit data word; providing the first coded data word for transmission over the communications channel as one or more multi-level symbols; wherein a code space, formed by combining each unique subset of coded data words associated with each data word of the first subset of n-bit data words, excludes any coded data word that has a transition from a maximum value symbol to a minimum value symbol and excludes any coded data word that has a transition from the minimum value symbol to the maximum value symbol; and wherein the first coded data word is selected to minimize an absolute value of an RDS, unless a selection would produce a transition, with respect to a boundary symbol of another coded data word, that is between a maximum level and a minimum level.