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Mobile Information Systems
Volume 2016 (2016), Article ID 5626495, 7 pages
http://dx.doi.org/10.1155/2016/5626495
Research Article

An Improved Cross Talk Cancelling Digital Predistortion for MIMO Transmitters

1National Key Laboratory of Communications, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China
2Department of Electronic Information Engineering, Jincheng College, Sichuan University, Chengdu, Sichuan 611731, China

Received 8 December 2015; Revised 25 February 2016; Accepted 3 March 2016

Academic Editor: Yuh-Shyan Chen

Copyright © 2016 Zhiliang Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An improved cross talk cancelling digital predistortion (ICTC-DPD) with novel estimating technique and decoupling technique is proposed, which can be used to compensate the cross talk with possible delay and compensate the nonlinearity with memory effect in MIMO transmitting channels. The cross talk cancellation ability, which is defined as the cross talk power ratio before cancellation to after cancellation in decibel, is analyzed and its closed-form expression is derived. Simulation results prove that the ICTC-DPD can achieve higher cross talk estimation accuracy and higher cross talk cancellation ability than the original CTC-DPD. Experimental results show that the ICTC-DPD can achieve 20 dB cross talk cancellation for two channels transmitting 20 MHz LTE signals.