Joint IQ Imbalance and Channel Estimation for MIMO-OFDM Systems with Sparse Multipath Channels
Liang Yan① Shu Feng①② Zhang Yi-jin① Berber Stevan③
①(Nanjing University of Science & Technology, School of Electronic Engineering and Optoelectronic Technology, Nanjing 210094, China) ②(National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China) ③(Department of Electrical and Computer Engineering, the University of Auckland, Auckland New Zealand)
Abstract：Considering the issue of In-phase and Quadrature-phase (IQ) imbalances in MIMO-OFDM systems with sparse multipath channels, a method jointing IQ imbalance with sparse channel estimation is proposed. The time-domain model for joint IQ imbalance and sparse channel estimation is derived and an estimation scheme based on l1−l2 norm optimization model and Parallel Coordinate Descent (PCD) algorithm is proposed. Simulation results show that the proposed scheme improves obviously the system performance compared with the traditional frequency-domain Least Squares (LS) and Matching Pursuit (MP) algorithms.
2013, Vol. 35 
