A Study on Reduction Method of Doppler Shifts Influences to OFDM System

Abstract

In this paper, improvement of symbol error rate characteristics of OFDM using adaptive equalizer when a doppler shifted delayed wave exists. When a doppler shifted delayed wave exists. When a doppler shifted delayed wave exists, interchannel interference occurs and symbol error rate degrades as a doppler frequency increases. In this paper, by using null symbol, interferences by a doppler shifts are extracted and interference on neighbor sub-carrier is cancelled using it. By theoretical analysis, improvement of symbol error rate characteristics are confirmed.