Double-Rate Equalization Using Tomlinson-Harashima Precoding for Multi-valued Data Transmission

The data rate of VLSI system interconnections has been increasing in response to the demand for high-speed interfaces. At high-speed data rates, achieving data transmission without bit errors is difficult because of intersymbol interference (ISI). We have proposed high-speed data communication techniques for VLSI systems using Tomlinson-Harashima precoding (THP). Because THP can eliminate ISI by inverting the characteristics of channels with limited peak power at the transmitter, it is suitable for implementing advanced low-voltage, high-speed VLSI systems. In this study, to further improve the THP performance, a novel double-rate THP equalization technique designed especially for multi-valued data transmission is presented. Simulation and measurement results show that the proposed THP equalization with a double sampling rate can enhance the transition time of data and hence improve the eye opening.