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A 5th-order analog predistorter for NADC system

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3 Author(s)
Sun, X.L. ; Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Hong Kong, China ; Cheung, S.W. ; Yuk, T.I.

This paper presents the design of a 5th-order analog predistorter using the inband intermodulation (IM) signals for predistortion of base-station high power amplifiers (HPAs) for the North American Digital Cellular (NADC) system. The predistorter employs two mixers with same configuration to generate 3rd-order intermodulation (IM3) products and 5th-order intermodulation (IM5) products, to suppress the 3rd-and 5th-order intermodulation distortion products (IMDP3 and IMDP5) at the HPA output. The predistorter is implemented and tested using the pi/4-DQPSK signal of the NADC system at 2.2GHz in a practical 100W-HPA. The results show that, at the HPA output powers of 65.6, 56.2, 50 and 41.3 W, the predistorter can suppress the adjacent channel power ratio (ACPR) of the pi/4-DQPSK signal at ± 20 kHz from the center frequency by 15.16, 15.83, 16.17 and 15.17 dB, respectively.

Published in:

Communication Systems (ICCS), 2010 IEEE International Conference on

Date of Conference:

17-19 Nov. 2010