A Study on PAR Improvement of OFDM system using SLM-PTS Combine Method and ETD-Turbo Code

Sung, Tae-Kyung; Kim, Dong-Seek; Cho, Hyung-Rae

Journal of Navigation and Port Research 2005;29(8):755-761.
Published online October 31, 2005.

SLM-PTS 결합기법 및 ETD-Turbo 부호를 적용한 OFDM 시스템에서의 PAR 개선에 관한 연구

성태경, 김동식, 조형래

A Study on PAR Improvement of OFDM system using SLM-PTS Combine Method and ETD-Turbo Code

Tae-Kyung Sung, Dong-Seek Kim, Hyung-Rae Cho

Abstract

In this paper, we propose a high-speed adaptive PTS method which eliminates high PAR(Peak-to-Average Power Ratio) and we compare the proposed method with other conventional methods. In addition, we have designed a combined type SLM-PTS scheme to reduce PAR and evaluate the performance. The system used for evaluating PAR performance can be constructed as COFDM (Coded Orthogonal Frequency Division Multiplexing) applying ETD(Enhabced Time Diversity)-Turbo coding scheme. All the analyses in this paper are focused on the system characteristics according to IFFT’s point and modulation method and the performance evaluation are based on the PAR reduction rates. As a result, the SLM-PTS combination method reveals good PAR reduction rate and remarkable reduction in the amount of calculations. Especially, in the case of combine-3 scheme, we can achieve approximately 3.7~3.9 ㏈ PAR reduction on a basis of 10-5 BER level. Moreover, we can eliminate the side information in COFDM system because of its adaptive characteristics in evaluating PAR reduction rate, so that the additional errors can be omitted.

Key Words: OFDM;PAPR;Coded-OFDM;Turbo code