Patent ID: 7466768

Claim:
A method for estimating IQ imbalance introduced on a receiver in a communication system, comprising the following steps: receiving a plurality of training signals comprising a preamble field with repeat training symbols during a frame time interval with N sampling intervals; calculating a ratio between each sampling point of the preamble field and a corresponding sampling point separated by N sampling intervals; deriving a Mean Square Error (MSE) equation for the calculated ratios assuming the calculated ratios are identical; and estimating parameters for IQ imbalance compensation according to the equation; wherein: the MSE equation is derived based on length of the preamble field and the N sampling intervals, defined as: MSE = ∑ l = 1 L - x - 1 ⁢  ( ⅇ j ⁢ ⁢ 2 ⁢ ⁢ π ⁢ ⁢ f · ( xTs ) ⁢ | t = l + 1 ) - ( ⅇ j ⁢ ⁢ 2 ⁢ ⁢ π ⁢ ⁢ Δ ⁢ ⁢ f · ( xTs ) ⁢ | t = 1 )  2 where L is a length of the preamble field, Ts is a sampling interval; and x is a number of sampling intervals between two repeated samples.