IQ Imbalance Compensation with a Pilot Sequence

Abstract

Signal degradation caused by receiver in-phase/quadrature (IQ) processing branch imbalance (IQI) is known to increase bit error rates, and deteriorate both angle of arrival (AoA) and ranging estimation accuracies. In this paper, we present an IQI compensation procedure that leverages a pilot sequence to propose an IQI compensation method, which tolerates time synchronization errors. We then explore a single anchor positioning problem and show that the proposed procedure is effective in improving the position estimation accuracy. We evaluate its performance via computer simulations. The results show that the scheme outperforms an earlier method, which is blind in the sense that it does not capitalize the pilot sequence availability.