Time-domain clustered transmit power adaptation for OFDM system in fading channels

• Published in: Journal of Zhejiang University. A. Science Vol. 7; no. 2; pp. 135 - 140
• Main Author: 甘小莺 徐友云 管云峰 宋文涛
• Format: Journal Article
• Language: English
• Published: Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200030, China 01-02-2006
• Subjects: OFDM系统; 发射功率; 正交频分复用; 衰落信道; Power adaptation; Time-domain cluster; Coherence time; Orthogonal frequency division multiplexing (OFDM)
• ISSN: 1673-565X; 1862-1775
• DOI: 10.1631/jzus.2006.A0135

This paper proposes a time-domain clustered transmitter power adaptation scheme for orthogonal frequency division multiplexing （OFDM） system, which can significantly reduce the feedback amount during power adaptation comparison with conventional frequency-domain adaptation schemes. It was found that the cluster size plays an important role on the adaptation performance, especially for the vehicular environment. Simulation results showed that using Lagrange interpolation to obtain an explicit curve of Doppler frequency vs cluster size yields good trade-off between the resulted bit error rate （BER） and the amount of feedback.