By Topic

Feedforward linearisation applied to a direct carrier modulation transmitter

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
M. Chongcheawchamnan ; Sch. of Electron. Eng., Inf. Technol. & Math., Surrey Univ., Guildford, UK ; M. J. Blewett ; I. D. Robertson

A feedforward system for direct carrier modulation transmitters is proposed and experimental results are presented. The advantage of this architecture over the conventional one using a feedforward amplifier is that the overall distortion resulting from the modulator is also reduced. The feedforward structure needs a reference signal to compare and cancel distortions: this is achieved using a second modulator which is operated at very low input level to obtain a signal with a negligible distortion. Simulation results suggest that the effect of LO feedthrough which can deteriorate the signal quality is also reduced. Experimental results on a 900 MHz feedforward transmitter with 192 kbps BPSK modulation and Nyquist filtering (α=0.35) show that adjacent channel interference is reduced by as much as 30 dB

Published in:

Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on  (Volume:1 )

Date of Conference: