Methods, systems, and circuits for determining convergent digital radio mode

A radio system for determining transmission mode and spectrum mode of Convergent Digital Radio, the radio system comprising:

• one or more antennas;
• a receive signal path operatively connected to the one or more antennas;
• and
• digital signal processing circuitry in communication with the receive signal path, the digital signal processing circuitry configured to implement a plurality of filters each having a passband corresponding to at least one spectrum mode, a group of correlators each configured to generate a correlation coefficient for a particular transmission mode and at least one particular spectrum mode, and a selection circuit configured to select a transmission mode of a Convergent Digital Radio signal received by the one or more antennas based on the correlation coefficients from the group of correlators and to map the correlation coefficients from the group of correlators to a spectrum mode of the Convergent Digital Radio signal.

A method of determining spectrum mode and transmission mode for Convergent Digital Radio, the method comprising:

• filtering a Convergent Digital Radio signal to generate a plurality of filtered signals;
• generating a group of correlation coefficients from the plurality of filtered signals, each correlation coefficient of the group of correlation coefficients corresponding to a particular transmission mode and at least one particular spectrum mode;
• selecting a transmission mode of the Convergent Digital Radio signal based on the group of correlation coefficients;
• and
• determining a spectrum mode of the Convergent Digital Radio signal based on mapping the group of correlation coefficients to the spectrum mode.