Abstract
This paper presents an efficient digital compensator that can be used for adjustment of gain and phase imbalances in linear amplification with nonlinear components (LINC) transmitters. The proposed compensator is designed in signal component separator (SCS) block using computational digital signal processing (DSP). Complex baseband equivalent signals and systems are considered to analyze error vector magnitude (EVM) and adjacent channel power ratio (ACPR) of the transmitter. Look up tables (LUT) based on the analyzed EVM and ACPR are used to compensate gain/phase imbalances of RF paths in the LINC transmitter. The suggested method is efficient to implement using computational software and DSP, and thus the compensator is reconfigurable for various input signals and RF transmitters. The LINC transmitter with the proposed compensator is implemented, and the suggested scheme is verified by showing the improvement of EVM and ACPR performance for the transmitted signals.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Cripps, S.C.: RF Power Amplifiers for Wireless Communications, pp. 285–425 (2006)
Chireix, H.: High Power Outphasing Modulation, vol. In: Proc. IRE, vol. 23, pp. 1370–1392 (1935)
Cox, D.C.: Linear Amplification with Nonlinear Components. IEEE Trans. 22, 1942–1945 (1974)
Jheng, K.Y., Chen, Y.J., Wu, A.Y.: Multilevel LINC System Designs for Power Efficiency Enhancement of Transmitters. IEEE Journal of Selected Topics in Signal Processing 3, 523–532 (2009)
Myoung, S., Lee, I., Yook, J., Laskar, J.: Mismatch Detection and Compensation Method for the LINC System Using a Closed-Form Expression. IEEE Trans. 56, 3050–3057 (2008)
Zhang, X., Larson, L.E., Asbeck, P.M., Nanawa, P.: Gain/Phase Imbalance Minimization Techniques for LINC Transmitters. IEEE Trans. 49, 2507–2516 (2001)
Lim, J., Kang, W., Ku, H.: Compensation of Path Imbalance in LINC Transmitters using EVM and ACPR Look up Tables, TH3G-08. In: APMC, Yokohama, pp. 1296–1299 (2010)
Gard, K.G., Gutierrez, M., Steer, M.B.: Characterization of Spectral Regrowth in Microwave Amplifiers Based on the Nonlinear Transformation of a Complex Gaussian Process. IEEE Trans. 47, 1059–1069 (1999)
National Instruments, http://www.ni.com
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2011 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Lim, J., Ku, H. (2011). Design of Efficient Reconfigurable Digital Compensator for Advanced Wireless Transmitter Using Computational Digital Signal Processing. In: Lee, G., Howard, D., Ślęzak, D. (eds) Convergence and Hybrid Information Technology. ICHIT 2011. Communications in Computer and Information Science, vol 206. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-24106-2_81
Download citation
DOI: https://doi.org/10.1007/978-3-642-24106-2_81
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-24105-5
Online ISBN: 978-3-642-24106-2
eBook Packages: Computer ScienceComputer Science (R0)