Among other things, a communication system and technique for transferring information between a stationary unit and a rotating unit of a computed tomography (CT) system is provided. A transmitter is configured to map digital data to an analog signal by selecting, from at least three signal configurations, a signal configuration associated with the digital data, and to generate an analog signal according to the selected signal configuration. A receiver of the communication system is configured to decode an analog signal by comparing characteristics of a signal sample to at least three possible signal configurations, and to identify a digital code word that corresponds to a signal configuration (of the at least three possible signal configurations) that matches characteristics of the signal sample. In this way, in a CT application, more than 1-bit of data may be communicated per analog signal, allowing more data to be communicated faster.
