Performance Analysis of OFDM-DSRC System Using LMMSE Equalization Technique

Sung, Tae-Kyung; Kim, Soon-Young; Rhee, Myung-Soo; Cho, Hyung-Rae

Journal of Navigation and Port Research 2005;29(1):23-28.
Published online February 28, 2005.

LMMSE 등화기법을 적용한 OFDM-DSRC 시스템의 성능분석

성태경, 김순영, 이명수, 조형래

Performance Analysis of OFDM-DSRC System Using LMMSE Equalization Technique

Tae-Kyung Sung, Soon-Young Kim, Myung-Soo Rhee, Hyung-Rae Cho

Abstract

The signal in wireless multi-path channel is affected by fading and ISI because of high data rate transmission, so the signal has the high error rate. The present modulation and demodulation method of DSRC system can not expect sufficient for providing data service over 1 Mbps, so the channel equalization and advanced modulation and demodulation methods are required OFDM is generally known as an effective technique for high data rate transmission system, since it can prevent ISI by inserting a guard interval. However, a guard interval longer than channel delay spread has to be used in each OFDM symbol period, thus resulting a considerable loss in the efficiency of channel utilization. Therefore the equalizer is necessary to cancel ISI to accommodate advanced ITS service with higher bit rate and longer channel delay spread condition. In this paper, the channel equalizer for the OFDM-DSRC system was designed and its performance in a multi-path fading environment was evaluated with computer simulation.

Key Words: DSRC 시스템;OFDM방식;LMMSE 채널등화; DSRC System;OFDM;ITS;LMMSE Channel Equalization;Channel Equalizer