Patent ID: 7817980

Claim:
A wireless receiver for receiving and demodulating a frequency modulated RF (radio frequency) signal by a direct conversion procedure, including channels for producing and processing in-phase and quadrature phase components of the received signal, and a processor for periodically estimating an error in at least one of the in-phase and quadrature phase components and for producing a signal to adjust at least one of the in-phase and quadrature phase components to compensate for the estimated error, wherein the processor is operable to form blocks of discrete samples of data derived from at least one of an in-phase component or a quadrature phase component of the received RF signal and to apply in estimating the error alternatively each of a plurality of different procedures to estimate the error, the procedures including: a first procedure applied when a signal quality value of the received RF signal is above a threshold value, which includes estimating, for each of the blocks, a maximum value and a minimum value of the discrete samples of the block and estimating a mean only of the maximum and minimum values; and a second procedure, applied when a signal quality value of the received RF signal is not above the threshold value, which includes estimating, for each of the blocks, a sum of the values of all discrete samples of the block and dividing the sum by the total number of discrete samples in the block to provide a mean value over all samples in the block.