A simple formula for monitoring quadrature phase error with arbitrary signals
The authors consider the problem of monitoring quadrature receiver errors without using specifically designed test signals. A previously derived simple formula /spl rho/=-sin /spl phi/ where /spl rho/ is the cross-correlation coefficient at zero lag between the in-phase (i) and quadrature phase (q) components and /spl phi/ is the receiver phase imbalance, is generalized in several ways. The generalized version, while still simple, is surprisingly robust because it applies to a wide variety of random and deterministic signals. However, it provides an estimate of /spl phi/ in the case of known noise power or large SNR. The effects of the additive receiver noise are also included. The case of jointly Gaussian i and q distributions is examined further and the marginal pdf's of the amplitude and phase of the random signal in the presence of quadrature errors are derived.
IEEE Transactions on Geoscience and Remote Sensing
Kulkarni, A. V.,
A simple formula for monitoring quadrature phase error with arbitrary signals.
IEEE Transactions on Geoscience and Remote Sensing,
Retrieved from: https://digitalcommons.mtu.edu/physics-fp/259