Linear transmitter for a frequency-hopping system using an adaptive predistortion linearizer

We have designed a linear power amplifier for a VHF frequency-hopping (FH) transmitter using an adaptive predistortion linearizer. We employed an anal og polynomial linearizer as a predistorter. In the predistortion linearizer , the recursive least squares (RLS) algorithm is employed for the optimizat ion process to minimize the en-ors between the predistorter and postdistort er output signals, The experimental results of the FH transmitter demonstra te that the spectral spreading is reduced by 10 dB. (C) 2001 John Wiley & S ons, Inc.