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

fYear

2001

fDate

2001

Firstpage

81

Lastpage

84

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio and Wireless Conference, 2001. RAWCON 2001. IEEE

Conference_Location

Waltham, MA

Print_ISBN

0-7803-7189-5

Type

conf

DOI

10.1109/RAWCON.2001.947524

Filename

947524