IQ imbalance compensation

Details IQ imbalance compensation IQ imbalance compensation

2004-06-14

2008-12-16

Burd, Kevin M (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S262000, C375S354000, C375S341000

Reexamination Certificate

active

07466768

ABSTRACT:
The present invention discloses a method and apparatus of IQ imbalance compensation for a receiver. The repetitive attribute of the preamble in a signal received by the receiver is used to estimate the IQ imbalance parameters. The data carried by the preamble repeats itself every N sampling intervals. A MSE equation is derived based on assuming the ratios between any two sampling points separated by N samples are identical, and the IQ imbalance parameters can be estimated by solving the MSE equation using the LS algorithm. Consequently, the IQ mismatch offset of the signal is compensated according to the estimated parameters.

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