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Design and Experimental Evaluation of a LINC Transmitter for OFDM Systems

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4 Author(s)
Garcia-Dúcar, P. ; Dept. of Electron. Eng. & Commun., Univ. of Zaragoza, Zaragoza, Spain ; de Mingo, J. ; Carro, P.L. ; Valdovinos, A.

The LInear amplification using Nonlinear Components (LINC) technique is a well-known power amplifier linearization method to reduce out-of-band interferences in a nonconstant envelope modulation system. Its major drawback is the inherent sensitivity to gain and phase imbalances between the two amplifier branches. In this paper a digital correction method, which corrects these gain and phase imbalances, is implemented and verified. Commercial analog devices and a digital platform for signal processing purposes are used. The experimental results applied in an OFDM transmitter show a linearity improvement close to 20 dB without reducing the output power and without increasing the in-band distortion.

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Wireless Communications, IEEE Transactions on  (Volume:9 ,  Issue: 10 )