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Reduced-Complexity Joint Baseband Compensation of Phase Noise and I/Q Imbalance for MIMO-OFDM

Summary: Reduced-Complexity Joint Baseband Compensation
of Phase Noise and I/Q Imbalance for MIMO-OFDM
Payam Rabiei, Student Member IEEE, Won Namgoong Senior Member IEEE, and Naofal Al-Dhahir, Fellow IEEE,
Abstract-- The maximum likelihood estimate of the impulse
response of a frequency-selective channel in the presence of phase
noise and I/Q imbalance is derived. The complexity of the joint
estimator is reduced using approximate cost functions for both
phase noise and I/Q imbalance. The proposed estimator is first
applied to OFDM transmission in a single-input single-output
system and then generalized to multi-input multi-output OFDM
systems. The bit error rate performance of popular space-time
codes for two and four transmit antennas is evaluated under zero-
forcing, minimum mean squared error and maximum likelihood
detection rules. An expression for the residual inter-carrier inter-
ference variance after phase noise and I/Q imbalance compensation
is derived and compared to the uncompensated case. Significant
improvement in signal-to-interference-noise is obtained with the
proposed algorithm.
Index Terms-- OFDM, MIMO, phase noise, I/Q imbalance,


Source: Al-Dhahir, Naofal - Department of Electrical Engineering, University of Texas at Dallas


Collections: Engineering