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The Journal of The Korea Institute of Intelligent Transport Systems Vol.4 No.1 pp.57-62
OFDM 기반 WLAN 수신기에서 효율적인 채널추정 기법에 관한 연구
A Study on the Effective Channel Estimation Method in OFDM Based WLAN
Abstract
In this paper, we propose a channel estimation method by impulse signal train in OFDM. In order to estimate the channel response, 4 impulse signals are generated and transmitted during one OFDM (Orthogonal Frequency Division Multiplexing) symbol. The intervals between the impulse signals are all equal in time domain. At the receiver, the impulse response signals are summed and averaged. And then, the averaged impulse response signal is zero padded and fast Fourier transformed to obtain the channel estimation. The BER performance of the proposed method is compared with those of conventional estimation method using the long training sequence in fast fading environments. The simulation results show that the proposed method improves by 3 dB in terms of Eb/No, compared with the conventional method.
