Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)
- 2000.06a
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- Pages.236-239
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- 2000
A Study on Efficient ISI Cancellation in Wireless LAN System
무선 LAN 시스템에 적합한 효율적인 ISI 제거에 관한 연구
Abstract
OFDM Transmission system can effectively reduce ISI(Inter Symbol Interference) caused by multipath fading, especially in the case of broad band data transmission. Nevertheless, the delayed waves existing in a symbol degrade the transmission Performance at the receiver. Therefore when OFDM transmission system applies to mobile radio communication system, we have to remove the influence without intricacy. This paper proposes and design a new scheme in order to estimate propagation characteristics using the characteristics of distinctive OFDM signal which is inserted pilot signal periodically in frequency axis before IFFT at the transmitter Moreover, we introduce a cancellation scheme of delayed signal on the basis of the proposed estimation technique. Using these schemes, it is possible to estimate and cancel the Interference of the delayed signal before FFT at the receiver.
Keywords