In-band on-channel digital broadcasting method and system

Details In-band on-channel digital broadcasting method and system In-band on-channel digital broadcasting method and system

1996-06-19

1999-09-07

Nguyen, Chau

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

370487, 375347, H04J 105, H04J 112

Patent

active

059497963

ABSTRACT:
A method and system are provided for the transmission and reception of an In-band On-channel (IBOC) FM-band digital audio broadcast (DAB) signal. The IBOC DAB signal is generated in the transmitter to substantially occupy the upper and lower sideband frequency regions in the RF emission mask for the conventional broadcast analog FM-band. Redundant source bit information is transmitted in both the upper and lower sidebands so that the loss of information in either one but not both sidebands due to large amounts of interference or distortion, caused by, for example, first-adjacent interference, does not deleteriously affect the IBOC DAB receiver performance. The system exhibits both frequency-diversity and time-diversity. The receiver determines which codeword bit estimate, corresponding to either upper or lower sideband signals, is less likely to be erroneous. The receiver system selects between decoded estimates for each pair of demodulated ECC codewords or combines both ECC codeword estimates prior to decoding in certain embodiments.

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