Abstract: A biasing algorithm, apparatus and method for detecting and modulation format of a received signal used in a mobile phone system implementing EDGE technology that transmits and receives both GMSK and 8PSK modulated signals. The biasing method and apparatus may also estimate the modulation format of bursts of data blocks of a received signal using information gathered and/or results determined during the modulation detection of one or more previous bursts of a data block to bias the modulation detection of a present burst of the same data block. The gathered information during the modulation detection of a previous burst includes either the signal-to-noise ratio or the noise energy information of the previous burst.

Abstract: Techniques to rotate the phase of a received signal to compensate for phase change or discontinuity introduced by circuit elements located directly in the receive signal path. One or more control signals are received, with each control signal being provided to adjust a particular characteristic of one or more circuit elements associated with the receive signal path. A phase rotation corresponding to an operating state defined by the control signals is then determined, and the phase of the received signal is rotated by an amount related to the determined phase rotation. In some designs, the phase rotation is performed on digitized inphase IIN and quadrature QIN samples to generate phase rotated IROT and QROT samples. The phase rotation can be performed by a complex multiply (after DC offset compensation) and, for ease of implementation, can be performed digitally in discrete increments (e.g., 90° increments).