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On compensating nonlinear distortions of an OFDM system using an efficient adaptive predistorter

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3 Author(s)
Hyun Woo Kang ; Inf. & Telecommun. R&D Center, Hyundai Electron. Ind. Co. Ltd., Seoul, South Korea ; Yong Soo Cho ; Dae Hee Youn

This paper presents an efficient adaptive predistortion technique compensating for nonlinear distortions caused by a high-power amplifier (HPA) cascaded with a linear filter in an OFDM system. In the proposed approach, the memoryless HPA, preceded by a linear filter with memory in OFDM systems, is modeled by the Wiener system, which is then precompensated by the proposed adaptive predistorter with a minimum number of filter taps. It is confirmed by computer simulation that the proposed approach produces a faster convergence speed than the previous adaptive predistortion technique, and provides a small output backoff as low as 5.5 dB for an OFDM system employing an HPA with a linear filter

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IEEE Transactions on Communications  (Volume:47 ,  Issue: 4 )