Device, system and method of I/Q mismatch correction
View Patent ↗Briefly, some embodiments of the invention may provide devices, systems and methods of in-phase and quadrature mismatch analysis and correction. For example, a method in accordance with an embodiment of the invention may include re-encoding an estimated symbol of an input signal having an in-phase component and a quadrature component, based on an analysis of a mismatch between said in-phase component and said quadrature component.
1. A method comprising:
receiving a signal having an in-phase component and a quadrature component;
analyzing a mismatch between said in-phase component and said quadrature component;
re-encoding an estimated symbol of the signal to generate a re-encoded signal, said re-encoding of said estimated symbol being based on said analyzing the mismatch; and
processing the re-encoded signal using a correction function, which is a function of a correction matrix Cor, to correct said mismatch between said in-phase component and said quadrature component, wherein said correction matrix Cor is given by:
Cor
=
1
B_est
⋆
cos
(
T_est
)
⋆
[
B_est
⋆
cos
(
T_est
2
)
-
sin
(
T_est
2
)
-
B_est
⋆
cos
(
T_est
2
)
cos
(
T_est
2
)
]
,
where B_est is an estimation of a substantially best value gain mismatch, and T_est is an estimation of a substantially best value phase mismatch of said in-phase component and said quadrature component.
2. The method of claim 1 , further comprising re-estimating a channel over which the signal is received, based on a Training Sequence of the processed re-encoded signal.
3. The method of claim 2 , further comprising re-estimating the estimated symbol of the signal, based on the processing the re-encoded signal.
4. The method of claim 3 , further comprising repeating (i) the re-encoding the estimated symbol of the signal, (ii) the processing the re-encoded signal using the correction function, (iii) the re-estimating the channel, and (iv) the re-estimating the estimated symbol, two or more times.
5. The method of claim 4 , wherein the repeating comprises:
repeating (i) the re-encoding the estimated symbol of the signal, (ii) the processing the re-encoded signal using the correction function, (iii) the re-estimating the channel, and (iv) the re-estimating the estimated symbol, until a calculated mismatch between the in-phase component and the quadrature component is smaller than a pre-defined threshold.
6. The method of claim 1 , further comprising
determining the substantially best value gain mismatch and substantially best value phase mismatch using a Least Mean Square algorithm.