Patent ID: 7499696

Claim:
A method for transmitting data having both primary and secondary data, said method comprising the steps of: transmitting a first transmit signal in satellite based transmission to legacy and second generation receivers, wherein said first transmit signal is produced when the transmitter hierarchically modulates the secondary data on selected symbols of the primary data to provide first modified primary data and modulates the first modified primary data on a first carrier wave, wherein each of the selected symbols of the primary data is modified in a predetermined manner and in one of two opposing directions based on the value of the secondary data recoverably applied with a first polarity; and transmitting a second transmit signal in satellite based transmission wherein said second transmit signal is produced when the transmitter hierarchically modulates the secondary data on the selected symbols of the primary data to provide second modified primary data and modulates the second modified primary data on a second carrier wave, wherein each of the selected symbols of the primary data is modified in the predetermined manner and in the other of the two opposing directions based on the value of the secondary data recoverably applied with a second polarity opposite the first polarity, whereby the modification of each selected symbol of the primary data in the first transmit signal based on the secondary data is opposite in direction to the modification of the corresponding symbol of the primary data in the second transmit signal based on the same secondary data while the values of the secondary data are recoverably preserved in the first and second transmit signals.