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| 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) |
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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.
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Received: 12 September 2012
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Corresponding Authors:
Shu Feng
E-mail: shufeng@njust.edu.cn
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2013, Vol. 35 
