Research Article
A Novel Approach for MIMO OFDM Systems to Estimate I/Q Imbalance, CFO, Channel Response Using Training Sequences
@INPROCEEDINGS{10.1007/978-3-642-27299-8_17, author={J. Tarun Kumar and K. Anitha Sheela}, title={A Novel Approach for MIMO OFDM Systems to Estimate I/Q Imbalance, CFO, Channel Response Using Training Sequences}, proceedings={Advances in Computer Science and Information Technology. Networks and Communications. Second International Conference, CCSIT 2012, Bangalore, India, January 2-4, 2012. Proceedings, Part I}, proceedings_a={CCSIT PART I}, year={2012}, month={11}, keywords={CFO Channel response I/Q imbalance MIMO OFDM}, doi={10.1007/978-3-642-27299-8_17} }- J. Tarun Kumar
K. Anitha Sheela
Year: 2012
A Novel Approach for MIMO OFDM Systems to Estimate I/Q Imbalance, CFO, Channel Response Using Training Sequences
CCSIT PART I
Springer
DOI: 10.1007/978-3-642-27299-8_17
Abstract
Systems using Orthogonal Frequency Division Multiplexing (OFDM) suffer with carrier frequency offset (CFO), in phase and quadrature phase imbalance (I/Q) due to which there will be large performance degradation. The CFO, I/Q imbalance are caused due to mismatch of carrier frequency at the transmitter and local oscillator frequency at the receiver. This paper presents a novel approach for joint estimation of I/Q imbalance, CFO and Channel Estimation for Multiple-Input Multiple-Output (MIMO) OFDM systems. A new energy parameter called is introduced, and from this parameter we can jointly estimate CFO, I/Q imbalance irrespective of channel estimation. The proposed method uses an optimal training block with one or two training sequences. For estimation of two repeated sequences, a two-step approach is proposed. From the simulation results we show that the Mean-Square Error (MSE) of this method is close to Cramer-Rao Bound (CRB).