Patent ID: 8675480

Claim:
A wireless communications system comprising: a base station; and a communications device configured to communicate with said base station via a plurality of different wireless communications channels using a modulation standard wherein a received modulation differs from a transmitted modulation as measured by a modulation fidelity value; said base station and said communications device being configured to cooperate to determine respective modulation fidelity values associated with a current channel and an alternate channel based upon a root mean square (RMS) frequency error between the received modulation and the transmitted modulation for the current channel and the alternate channel, and selectively switch between the current channel and the alternate channel based upon the determined modulation fidelity values, wherein the respective modulation fidelity values are determined based upon frequency modulation values for known signal points when symbol synchronization information is known, and based upon frequency modulation values for a plurality of sample positions when the symbol synchronization information is unknown.