High Rate and High Multiplexing CAN by Short Pulse Line Codes

Controller area network (CAN) is one of communication standards for in-vehicle control networks and enables electronic control units (ECU) to communicate various control commands with each other via a CAN bus. It is currently expected to develop CAN with higher rate and higher multiplexing, but the communication may be disabled by inter-symbol interference (ISI) due to ringing. In this paper, short pulse line codes and their symbol detection by weighted majority decision are proposed to achieve CAN with higher rate and higher multiplexing. A network structure is extracted as an evaluation network, which has large ringing duration by analyzing the transmission characteristics. The numerical analysis on received signals shows that the proposed schemes achieve sufficiently high reliability in the evaluation network. A prototype ECU implementing the proposed schemes provide successful communication links which are disabled in the conventional ECU.