Forward Error Correction Coding For AM 9kHz and 10kHz In-Band On-Channel Digital Audio Broadcasting Systems

A method of receiving an AM compatible digital audio broadcasting signal, the method comprising:

• receiving an analog modulated carrier signal centrally positioned in a radio channel, and a plurality of digitally modulated subcarrier signals in the radio channel, wherein the digitally modulated subcarrier signals are modulated using complementary pattern-mapped trellis code modulation (CPTCM) including a code mapped to overlapping partitions including an upper main partition, a lower main partition, an upper backup partition and a lower backup partition, and a non-overlapping tertiary partition;
• and
• demodulating the analog modulated carrier signal and the plurality of digitally modulated subcarrier signals;
• and
• producing an output signal in response to the demodulating step.

A receiver receiving an AM compatible digital audio broadcasting signal, the receiver comprising:

• an input for receiving an analog modulated carrier signal centrally positioned in a radio channel, and a plurality of digitally modulated subcarrier signals in the radio channel, wherein the digitally modulated subcarrier signals are modulated using complementary pattern-mapped trellis code modulation (CPTCM) including a code mapped to overlapping partitions including an upper main partition, a lower main partition, an upper backup partition and a lower backup partition, and a non-overlapping tertiary partition;
• a demodulator for demodulating the plurality of subcarriers with the partitioned bits;
• and
• an output for producing an output signal in response to the demodulator.