초록 ▼

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

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.

대표청구항 ▼

[ I claim:] [1.] An in-band on-channel (IBOC) digital broadcast receiver comprising:receiving means for receiving an IBOC digital signal with source bit information which is duplicated in both upper and lower sidebands of a predetermined radio frequency (RF) mask and wherein the duplicated source bi

[ I claim:] [1.] An in-band on-channel (IBOC) digital broadcast receiver comprising:receiving means for receiving an IBOC digital signal with source bit information which is duplicated in both upper and lower sidebands of a predetermined radio frequency (RF) mask and wherein the duplicated source bit information is encoded differently in the upper sideband than in the lower sideband so that the receiver and corresponding system are more robust against interference;demodulation means for demodulating the received IBOC signal including the duplicated source bit information in both the upper and lower sidebands, with the differently encoded upper and lower sidebands with duplicated source bit information being demodulated by said demodulation means;determination means for determining whether the demodulated redundant source bit information in the upper sideband or the lower sideband is less likely to be erroneous; andselection means for selecting the demodulated source bit information determined by said determination means as less likely to be erroneous without requiring prior knowledge as to which sideband is less likely to be deleteriously affected.