Title :
Pilotless adaptation of feedforward amplifiers driven by high-stress signals
Author :
Larose, Colin L. ; Ghannouchi, Fadhel M.
Author_Institution :
Poly-GRAMES Res. Center, Ecole Polytech. de Montreal, Que., Canada
Abstract :
A statistical analysis of a feedforward amplifier driven by a high-stress CDMA signal reveals phenomena that are not noticeable when it is driven by the ideal two-tone signal mostly used in previous studies. As a consequence, the traditional methods of adapting the signal cancellation loop yield sub-optimal linearization performance, hence sub-optimal power efficiency for a given linearity. Practical implementation of a previously proposed optimal method is shown to require the complex gain stabilization (CGS) method of adapting the error cancellation loop
Keywords :
code division multiple access; feedforward; interference suppression; radiofrequency amplifiers; CGS method; complex gain stabilization method; error cancellation loop; feedforward amplifier; feedforward amplifiers; high-stress CDMA signal; high-stress signals; pilotless adaptation; signal cancellation loop; statistical analysis; sub-optimal linearization performance; sub-optimal power efficiency; Baseband; Delay; Digital modulation; Gradient methods; Linearity; Minimization methods; Performance gain; Power system modeling; Statistical analysis; Virtual manufacturing;
Conference_Titel :
Radio and Wireless Conference, 2001. RAWCON 2001. IEEE
Conference_Location :
Waltham, MA
Print_ISBN :
0-7803-7189-5
DOI :
10.1109/RAWCON.2001.947524
