A Study of Adaptive Guard Interval with Estimation of Channel Impulse Response for OFDM system

被引：0
|
作者：
Tanaka, Hideaki [1 ]
Sasaoka, Naoto [1 ]
Nakanishi, Takaharu [1 ]
Itoh, Yoshio [1 ]
机构：
[1] Tottori Univ, Grad Sch Engn, Tottori 6808552, Japan
来源：
2008 INTERNATIONAL SYMPOSIUM ON INTELLIGENT SIGNAL PROCESSING AND COMMUNICATIONS SYSTEMS (ISPACS 2008) | 2008年
关键词：
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In an orthogonal frequency division multiplexing (OFDM) system, a guard interval (GI) is used to remove the inter-symbol interference (ISI) due to a multipath channel. When the length of the GI is shorter than the maximum delay of the multipath channel, the ISI occurs. On the other hand, a long GI decreases transmission efficiency. In this paper, we propose an adaptive control method of the guard interval length. A channel impulse response is obtained by applying inverse fast Fourier transform (IFFT) to the estimated frequency-domain channel response. The maximum delay is then estimated from the channel impulse response, and the optimal length of the GI is decided from the maximum delay.
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页码：262 / 265
页数：4
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