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Proceedings Paper

An adaptive OFDM system with variable guard interval
Author(s): Lifeng Lai; Zhaoyang Zhang; Guanding Yu; Aiping Huang; Peiliang Qiu
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Paper Abstract

Symbol guard interval is almost indispensable to deal with ISI caused by channel delay spreading in wireless OFDM transmission systems. However, the length of guard interval is usually fixed in conventional OFDM system, which decreases the power and spectrum efficiency considerably, especially in a mobile environment. To solve this problem, a novel conceptual adaptive OFDM system with variable guard interval (AOFDM-VGI) is proposed in this paper. This system first utilizes the preamble and pilot sub-carriers of each OFDM packet burst to estimate the channel RMS delay spread, and then the result is fed into the guard interval controller. Then, the controller uses a criterion to calculate the guard interval and control the OFDM transmitter. For a typical simulation model as illustrated in this paper, this system can transmit a data rate 11.5 Mb/s higher and consume a power 0.65 dB less than the conventional non-adaptive counterpart without sacrificing the BER performance.

Paper Details

Date Published: 28 April 2004
PDF: 10 pages
Proc. SPIE 5284, Wireless Communications and Networks, (28 April 2004); doi: 10.1117/12.523283
Show Author Affiliations
Lifeng Lai, Zhejiang Univ. (China)
Zhaoyang Zhang, Zhejiang Univ. (China)
Guanding Yu, Zhejiang Univ. (China)
Aiping Huang, Zhejiang Univ. (China)
Peiliang Qiu, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 5284:
Wireless Communications and Networks
Chih-Lin I; Jiann-An Tsai; Hequan Wu, Editor(s)

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