Analysis of nonlinear companding techniques for short range DMT optical links

摘要

Discrete Multitone, like any multicarrier communication system, presents an important issue which degrades its performance when a nonlinear device is located at the transmitter: a high Peak-to-Average Power Ratio. Many approaches were proposed to solve this problem, of which nonlinear companding techniques are a good choice, especially when low computational cost and low power consumption are sought. In this work, a comparative analysis of four representative kinds of nonlinear companding methods is presented. Simulations are performed to analyze the different techniques when they are applied in a short range DMT optical fiber link which employs direct modulation of a laser diode current on the transmitter.