Adaptive OFDM with Channel Predictor in Broadband Wireless Mobile Communications 


Vol. 29,  No. 4, pp. 370-377, Apr.  2004


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  Abstract

In this paper, we present an adaptive modulation technique for orthogonal frequency division multiplexing (OFDM) for broadband wireless communications. Also, using improved channel prediction, we enhance the performance of adaptive OFDM in high mobility environments. Adaptive modulation technique has been shown to achieve reliable high-rate data transmission over frequency-selective fading channel when OFDM is employed. This scheme requires the accurate channel information between two stations for a better performance. In an outdoor high mobility environment, most of adaptive OFDM systems have to be given the channel information transmitted from the receiver. Even if it is possible, there is some delay. Moreover, the channel impulse response between two stations is very rapidly varied. If the channel information is obsolete at the time of transmission, then poor system performance will result. In order to solve this problem, we propose adaptive OFDM with improved channel predictor. The proposed bit allocation algorithm has a lower complexity and the proposed scheme mitigates the effect of channel delay. Robust approach is less sensitive to outdated channel information. Performance results show that the proposed scheme can achieve considerable performance enhancement.

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  Cite this article

[IEEE Style]

T. J. Hwang, H. S. Hwang, H. K. Baik, "Adaptive OFDM with Channel Predictor in Broadband Wireless Mobile Communications," The Journal of Korean Institute of Communications and Information Sciences, vol. 29, no. 4, pp. 370-377, 2004. DOI: .

[ACM Style]

Tae Jin Hwang, Ho Seon Hwang, and Heung Ki Baik. 2004. Adaptive OFDM with Channel Predictor in Broadband Wireless Mobile Communications. The Journal of Korean Institute of Communications and Information Sciences, 29, 4, (2004), 370-377. DOI: .

[KICS Style]

Tae Jin Hwang, Ho Seon Hwang, Heung Ki Baik, "Adaptive OFDM with Channel Predictor in Broadband Wireless Mobile Communications," The Journal of Korean Institute of Communications and Information Sciences, vol. 29, no. 4, pp. 370-377, 4. 2004.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880