Symbol self synchronous interleaving method and apparatus...

Details Symbol self synchronous interleaving method and apparatus... Symbol self synchronous interleaving method and apparatus...

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.

REFERENCES:
patent: 5903546 (1999-05-01), Ikeda et al.
patent: 5949796 (1999-09-01), Kumar
patent: 6353637 (2002-03-01), Mansour et al.
patent: 0 800 287 (1997-10-01), None
patent: WO 98/21832 (1998-05-01), None

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