A method of broadcasting an AM compatible digital audio broadcasting
signal includes: producing an analog modulated carrier signal centrally
positioned in a radio channel, wherein the analog modulated carrier
signal is modulated by an analog signal, producing 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 transmitting the analog modulated
carrier signal and the plurality of digitally modulated subcarrier
signals. Transmitters that broadcast the signal and receivers that
receive the signal, and the reception method are also included.