Abstract: Systems and techniques for in-phase/quadrature estimation are described. Reference signals are configured and used to perform in-phase and quadrature estimation of a transmitter of a transceiver. Compensation is then performed on the transmitter and the fully-compensated transmitter is used to provide reference signals for in-phase and quadrature estimation of the receiver, and receiver compensation is performed.

Abstract: Systems and techniques for in-phase/quadrature estimation are described. As data frames are received at a wireless networking direct-conversion receiver, preambles of the data frames are examined to identify frequency-independent subcarriers. Preamble-based estimation is used to estimate in-phase/quadrature imbalance for frequency-independent subcarriers and blind estimation is used to estimate in-phase/quadrature imbalance for frequency-dependent subcarriers. The estimation may be performed continuously and refined as new frames are received. At appropriate intervals, compensation is performed using current imbalance estimates.