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Performance Improvement Technique for an OFDM System without Guard Interval  

Kim Sung-Hoon (한양대학교 대학원 전자전기제어계측과 이동통신시스템 연구실)
Park Joong-Hoo (한양대학교 대학원 전자전기제어계측과 이동통신시스템 연구실)
Choi Gin-Kyu (홍익대학교 전자전기컴퓨터공학부 전자공학)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.5A, 2005 , pp. 382-388 More about this Journal
Abstract
An OFDM system may be a good candidate for a next-generation wireless communication system which requires high-speed and high-rate data transmission. In OFDM systems, guard intervals are inserted to mitigate the effects of ISI (Inter-Symbol Interference). But guard interval insertion degrades the system performance from the standpoint of data rate and bandwidth efficiency. In this paper, a new method to improve the performance of an OFDM system without guard interval. First, PIC (Parallel Interference Cancellation) scheme which can reduce ISI by subtracting the estimated multi-path components from the received signal will be considered. And the proposed system with Pseudo-Decorrelator estimates transmitted signals by using the inverse matrix of cross-correlation matrix relating to interference components. The performance of the proposed system is evaluated through computer simulations and compared with that of the PIC system and an OFDM system without guard interval.
Keywords
OFDM; Guard Interval; Pseudo-Decorrelator;
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