Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2006-01-10
2006-01-10
Chin, Vivian (Department: 2682)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C370S344000
Reexamination Certificate
active
06985537
ABSTRACT:
An interleaving method and apparatus is disclosed for an in-band on-channel (IBOC) digital audio broadcasting (DAB) system. The disclosed interleaver method and apparatus utilize a convolutional interleaver having a row size equal to one OFDM symbol and a time span of arbitrary size. A structured memory block is utilized in the de-interleaver at the receiver having a row size of one OFDM symbol (the number of active sub-carriers in the applicable sub-band of the IBOC system). The self-synchronizing nature of the present invention permits a receiver in an OFDM-based IBOC system to sort the scrambled blocks and descramble the received symbols according to its own frame count, without regard to the frame count of the transmitter. The disclosed interleaver method and apparatus does not require interleaver synchronization between the transmitter and receiver. In one implementation, separate convolutional encoders and convolutional interleavers are applied to each sub-band in a multi-stream structure to provide independent error spreading for each sub-band.
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patent: 6353637 (2002-03-01), Mansour et al.
patent: 0 800 287 (1997-10-01), None
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Chin Vivian
Lucent Technologies - Inc.
West Lewis G.
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