Adaptive Gain and Delay Mismatch Cancellation for LINC Transmitter

Corinne Berland 1, 2 Jean-François Bercher 3 Olivier Venard 1
1 ESIEE Paris
2 LaMIPS - Laboratoire de Microélectronique et de Physique des Semiconducteurs
3 LIGM - Laboratoire d'Informatique Gaspard-Monge
Abstract : Linear amplification with Nonlinear Component (LINC) transmitter architecture is an efficient solution for high efficiency amplification of signals. Nonetheless, this solution suffers both from gain impairment and delay mismatch between the two signal paths. Indeed, a mismatch in propagation time between the paths degrades the quality of the transmit signal but also disrupts the convergence of the gain correction algorithm resulting in a degradation of its performance. In this paper, we present an adaptive algorithm based on a gradient descent formulation for the identification and correction of these delays. We also demonstrate its effectiveness when applied prior to the gain adjustment procedure. The identification approach is preferred here, to ensure monitoring facilities.
Keywords : Radio transmitters Power amplifiers Adaptive signal processing Delay filters Delay estimation Nonlinear distortion
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Corinne Berland, Jean-François Bercher, Olivier Venard. Adaptive Gain and Delay Mismatch Cancellation for LINC Transmitter. Analog Integrated Circuits and Signal Processing, Springer Verlag, 2010, 65 (1), pp.151-156. ⟨10.1007/s10470-010-9477-5⟩. ⟨hal-00621968⟩

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