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A Study on Linearization of Intermodulation Distortion for WCDMA
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 Title & Authors
A Study on Linearization of Intermodulation Distortion for WCDMA
Jeon, Joong-Sung; Kim, Dong-il;
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 Abstract
A linear power amplifier is particularly emphasized on the system using a linear modulations, such as 16QAM and QPSK with pulse shaping, because intermodulation distortion which causes adjacent channel interference and co-channel interference is mostly generated in a nonlinear power amplifier. In this paper, parameters of a linearization loop, such as an amplitude imbalance, a phase imbalance and a delay mismatch, are briefly analyzed to get a specific cancellation performance and linearization bandwidth Experimental results are presented for IMT-2000 frequency band The center frequency of the feedforward amplifier is 2140MHz with 60MHz bandwidth When the average output power of feedforward amplifier is 20 Watt, the intermodulation cancellation performance is more than 28dB. In this case, the output power of feedforward amplifier reduced 3.5dB because of extra delay line loss and coupling loss. The feedforward amplifier efficiency is more than 7% for multicarrier signals.
 Keywords
Linearization;Feedforward;Delay line;Intermodulation;
 Language
English
 Cited by
1.
전력증폭기의 선형성 및 효율 향상에 관한 연구,전중성;

한국마린엔지니어링학회지, 2005. vol.29. 6, pp.618-627
 References
1.
Cavers, J. K. (1995), 'Adaptation Behavior of Feedforward Amplifier Linearizer,' IEEE Transactions on Vehicular Technology. vol. 44, No.1 pp. 31-40 crossref(new window)

2.
Cripps, S. C. (1999), RF Power Amplifiers for Wireless Communication. Norwood, MA: Artech House

3.
Kenington, P. B. (2000), High-linearity RF amplifier design. Norwood, MA: Artech House

4.
Nagata, Y. (1989), 'Linear Amplification Technique for Digital Mobile Communications,' IEEE Vehicular Technology Conf., San Fransisco, pp. 159-164

5.
Pothecary, Nick (1999), Feedforward Linear Power Amplifiers. Norwood, MA: Artech House

6.
Rappaport, T. S. (2001), Wireless Communications Principles and Practice, IEEE Press, pp. 197-294

7.
Raab, F. H., Asbeck, P., Cripps, S., Kenington, P. B., Popovic, Z. B., Pothecary, N., Sevic, J F., and Sokal, N. O. (2002), 'Power amplifiers and transmitters for RF and ]\,;1icrowave,' IEEE Trans. Mcrowave Theory Tech. vol. 50, No.3 pp. 814-826 crossref(new window)

8.
Seidel, H. (1971), 'A Mcrowave Feedforward Experimental,' Bell System Technical Journal, vol. 50, No.9, pp. 2879-2916 crossref(new window)

9.
Sundstrom, Lars (1996), 'The Effect of Quantization in a Digital Signal Component Separator for LINC Transmitters,' IEEE Transactions on Vehicular Technology. vol. 45, No.2 pp. 346-352 crossref(new window)