Patent ID: 8081687

Claim:
A radio receiver, comprising: a plurality of receive paths, wherein each of the plurality of receive paths produce an ingoing digital signal in parallel, the each receive path of the plurality of receive paths share at least one gain element, a filter element and an analog-to-digital converter (ADC) sequentially disposed; and a baseband processor operable to receive each of the ingoing digital signals and to process each of the ingoing digital signals, wherein the baseband processor is operable to, for each of the ingoing digital signals: determine and classify a received frame of the ingoing digital signals, early in a short training sequence (STRN) of the received frame and prior to a subsequent long training sequence (LTRN) of the received frame, as being a lower first bandwidth, an upper first bandwidth, or a second bandwidth based upon a comparison of a detected power level in relation to a lower first bandwidth region, an upper first bandwidth region, and a second bandwidth region, wherein the second bandwidth is sized substantially the same as sum of the upper and lower first bandwidths and approximately occupies a frequency range of the upper and the lower first bandwidth, wherein the determination and classification of the received frame includes one of a legacy transmission, mixed mode transmissions, and Greenfield transmissions based upon the comparison of the detected power level; and update the classification of the received frame when inaccurate.