Synthesis of Ternary Codes for Spectrum Shaping.

摘要

An important aspect in the design of PAM data transmission systems using self-timing repeatered lines is matching the source data to the transmission medium. The medium (cable with repeaters) is band-limited which constrains the data rate. In addition, its low frequency characteristics are poor and the repeaters are ac coupled so that dc in the data signal must be restored by extra circuitry. Transmission errors occur from timing jitter (which can cause loss of bit synchronization), intersymbol interference, and noise (impulse, cross-talk, etc). One design problem in this area is the selection of an encoded representation of the binary data so that the data signal is more compatible with the medium. The conversion of the binary data to multilevel data has become a popular approach to this design problem.