Journal of Systems Engineering and Electronics ›› 2013, Vol. 24 ›› Issue (2): 204-208.doi: 10.1109/JSEE.2013.00026

• ELECTRONICS TECHNOLOGY • Previous Articles     Next Articles

High-performance compensation scheme for frequencydependent IQ imbalances in OFDM transmitter and receiver

Yan Liang1,4, Feng Shu1,2,*, Yijin Zhang1, and Junhui Zhao3   

  1. 1. School of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing 210094, China;
    2. National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China;
    3. School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China;
    4. College of Telecommunications & Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
  • Online:2013-04-25 Published:2010-01-03

Abstract:

An efficient compensation scheme combining a timedomain Gaussian elimination (GE) channel estimator and a frequency-domain GE equalizer is proposed for orthogonal frequency division multiplexing (OFDM) systems with frequencydependent in-phase and quadrature-phase (IQ) imbalances at both transmitter and receiver. Compared with the traditional least square and least mean square compensation schemes, the proposed compensation scheme achieves the same bit error rate as the ideal IQ branches by using only two training OFDM symbols instead of about 20 OFDM symbols.