Title :
LINC imbalance correction using baseband preconditioning
Author :
Olson, Scott A. ; Stengel, Robert E.
Author_Institution :
Motorola Inc., Plantation, FL, USA
Abstract :
An open loop means of correcting the imbalances in a linear amplification using nonlinear components (LINC) transmitter is presented it is shown that all amplitude, phase and quadrature errors can be compensated for by preconditioning the baseband modulation signals and making one DC adjustment in the transmitter the six necessary compensation coefficients can be determined by a simple set of relative RF power measurements. Using an automatic tuning procedure, a one watt VHF LINC transmitter was able to meet the FCC emissions mask with 6.25 kHz π/4 QPSK modulation
Keywords :
VHF amplifiers; error compensation; power measurement; quadrature phase shift keying; radio transmitters; signal processing; tuning; π/4 QPSK modulation; 1 W; 6.25 kHz; DC adjustment; FCC emissions mask; LINC imbalance correction; LINC transmitter; VHF LINC transmitter; amplitude errors; automatic tuning procedure; baseband modulation signals; baseband preconditioning; compensation coefficients; error compensation; linear amplification using nonlinear components; phase errors; quadrature errors; relative RF power measurements; transmitter; Amplitude modulation; Baseband; Error correction; FCC; Phase modulation; Power measurement; Quadrature phase shift keying; RF signals; Radio frequency; Transmitters;
Conference_Titel :
Radio and Wireless Conference, 1999. RAWCON 99. 1999 IEEE
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-5454-0
DOI :
10.1109/RAWCON.1999.810959
