Wideband Compensation of RF Vector Multiplier for RF Predistortion Systems

This brief presents a wideband compensation method that addresses the hardware imperfections exhibited in an RF vector multiplier (RF-VM) used for RF predistortion systems. A wideband RF-VM model is first developed to embed the various sources of imperfections in an RF-VM. A compensation method is t...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2016-11, Vol.63 (11), p.1084-1088
Main Authors: Jingjing Xia, Ng, Eric, Boumaiza, Slim
Format: Article
Language:English
Subjects:
Algorithms
Analog–RF predistortion (ARF-PD)
Bandwidth
Broadband
Compensation
Couplers
Defects
digital–RF predistortion (DRF-PD)
Finite impulse response filters
Modulation
Parameter identification
Power amplifiers
Predistortion
Radio frequency
RF vector multiplier (RF-VM)
Wideband communications
wideband I/Q imbalance
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Summary:This brief presents a wideband compensation method that addresses the hardware imperfections exhibited in an RF vector multiplier (RF-VM) used for RF predistortion systems. A wideband RF-VM model is first developed to embed the various sources of imperfections in an RF-VM. A compensation method is then presented, followed by a newly proposed identification algorithm to determine the parameters of the compensation modules. Experimental results indicated that the use of the proposed compensation method can lead to an improved error vector magnitude of up to 10 dB, when the RF-VM generates a synthesized predistortion signal of 150-MHz modulation bandwidth. Furthermore, an improvement up to 3.9 dB in the adjacent channel leakage ratio was obtained when using the compensated RF-VM to linearize solid-state power amplifiers driven by wideband communication signals.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2016.2548278