An MMSE Based Calibration of a LINC Transmitter

Riichiro NAGAREDA  Kazuhiko FUKAWA  Hiroshi SUZUKI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E87-B    No.3    pp.689-694
Publication Date: 2004/03/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
Keyword: 
mobile radio communications,  LINC,  least-squares method,  

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Summary: 
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.