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An MMSE Based Calibration of a LINC Transmitter
Riichiro NAGAREDA Kazuhiko FUKAWA Hiroshi SUZUKI
IEICE TRANSACTIONS on Communications
Publication Date: 2004/03/01
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
mobile radio communications, LINC, least-squares method,
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This paper proposes a new correction technique for a linear amplification with nonlinear components (LINC) transmitter. The technique, which is based on the minimum mean squared error (MMSE) criterion, estimates the gain and phase imbalance between the two amplifier branches. With information on the estimation, the imbalance is offset by controlling the amplitude and phase of the input signal that is fed into one of the two amplifiers. Computer simulations with a DS-CDMA system demonstrate that this method can compensate for the imbalance and sufficiently suppress the out-of-band distortion spectrum.