Method of compensating for non-linearities in an end amplifier i

Details Method of compensating for non-linearities in an end amplifier i Method of compensating for non-linearities in an end amplifier i

1997-01-22

1993-03-02

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

330149, H04L 2736

Patent

active

051915979

ABSTRACT:
A method for compensating for non-linearities in an end amplifier (F) having a given transfer function H.sub.R, H.sub..phi. for amplitude and phase respectively and included in a radio transmitter of quadrature type for linear, digital modulation, and in which table look-up units (ST, CT) store the digital sine and cosine values (I(t,.alpha.), Q(t,.alpha.)) of the quadrature components determined by a given signal vector .alpha.. According to the method of values of the transfer functions H.sub.R, H.sub..phi. for the quadrature modulated radio signals r(t,.alpha.) are calculated by addressing memory units (MH1, MH2) which store a number of values of H.sub.R and H.sub..phi.. The sine and cosine values of the addressed values of H.sub.R and H.sub..phi. are also formed. The thus calculated values are multiplied by the stored digital values in the table look-up units (ST, CT) and by the inverted value of H.sub.R. As a result, new modified values i(t,.alpha.), q(t,.alpha.) are obtained for the quadrature components, which compensates for the non-linearities in the final amplifier.

REFERENCES:
patent: 4229821 (1980-10-01), de Jager et al.
patent: 4412337 (1983-10-01), Bickley et al.
patent: 4565980 (1986-01-01), Ashida
patent: 4696017 (1987-09-01), Masheff et al.
patent: 4750192 (1988-06-01), Dzung
patent: 4787094 (1988-11-01), Eguchi

Affiliated with

Also associated with

Rating

Method of compensating for non-linearities in an end amplifier i does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of compensating for non-linearities in an end amplifier i, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of compensating for non-linearities in an end amplifier i will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-132211