In-band adjacent-channel digital audio broadcasting system
First Claim
1. An in-band adjacent-channel digital audio broadcasting system, comprising:
- a scrambling unit for scrambling a signal to be broadcasted, thereby generating a scrambled signal;
an outer coding unit for performing a first encoding including a Reed-Solomon (RS) coding of the scrambled signal, thereby generating an outer encoded signal;
an outer interleaving unit for performing a first interleaving of the outer encoded signal on a byte by byte basis, thereby generating an outer interleaved signal;
an inner coding unit for performing a second encoding including a convolutional coding and a trellis coding of the outer interleaved signal, thereby generating an inner encoded signal;
an inner interleaving unit for performing a second interleaving of the inner encoded signal, thereby generating an inner interleaved signal;
a modulating unit for modulating the inner interleaved signal, thereby generating an orthogonal frequency division multiplexing (OFDM) symbols, the modulating unit including;
a signal mapping unit for generating 8PSK or 16QAM data samples based on the inner interleaved signal;
a frame adapting unit for constructing a transmission frame based on TPSs, pilot samples and data samples; and
an IFFT unit for performing an inverse fast Fourier transform (IFFT) of the transmission frame to generate OFDM symbols;
a guard interval inserting unit for inserting a guard interval between the OFDM symbols in order to eliminate an inter-symbol interference, thereby generating an OFDM frame; and
an RF processing unit for performing a conversion of the OFDM frame into an analog radio frequency signal so that the OFDM signal can be transmitted in a specific frequency channel of an FM frequency band, and for amplifying and outputting the analog radio frequency signal, whereinthe system concurrently supports both of coded-orthogonal frequency division multiplexing (COFDM) and Trellis COFDM (TCOFDM) transmission modes based on the same systematic parameters, anda conversion of the COFDM and the TCOFDM transmission modes is efficiently embodied by a change of an output data rate of an MPEG-2 multiplexer.
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Accused Products
Abstract
The in-band adjacent-channel digital audio broadcasting system includes a scrambling unit for scrambling a signal to be broadcasted, thereby generating a scrambled signal; an outer coding unit for performing a first encoding of the scrambled signal, thereby generating an outer encoded signal; an outer interleaving unit for performing a first interleaving of the outer encoded signal a byte by byte basis, thereby generating an outer interleaved signal; an inner coding unit for performing a second encoding the outer interleaved signal, thereby generating an inner encoded signal; an inner interleaving unit for performing a second interleaving of the inner encoded signal, thereby generating an inner interleaved signal; a modulating unit for modulating the inner interleaved signal, thereby generating an orthogonal frequency division multiplexing (OFDM) symbols; a guard interval inserting unit for inserting a guard interval between the OFDM symbols in order to eliminate an inter-symbol interference, thereby generating an OFDM frame; and an RF processing unit for performing a conversion of the OFDM frame into an analog radio frequency signal so that the OFDM signal can be transmitted in a specific frequency channel of an FM frequency band, and for amplifying and outputting the analog radio frequency signal.
64 Citations
12 Claims
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1. An in-band adjacent-channel digital audio broadcasting system, comprising:
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a scrambling unit for scrambling a signal to be broadcasted, thereby generating a scrambled signal; an outer coding unit for performing a first encoding including a Reed-Solomon (RS) coding of the scrambled signal, thereby generating an outer encoded signal; an outer interleaving unit for performing a first interleaving of the outer encoded signal on a byte by byte basis, thereby generating an outer interleaved signal; an inner coding unit for performing a second encoding including a convolutional coding and a trellis coding of the outer interleaved signal, thereby generating an inner encoded signal; an inner interleaving unit for performing a second interleaving of the inner encoded signal, thereby generating an inner interleaved signal; a modulating unit for modulating the inner interleaved signal, thereby generating an orthogonal frequency division multiplexing (OFDM) symbols, the modulating unit including; a signal mapping unit for generating 8PSK or 16QAM data samples based on the inner interleaved signal; a frame adapting unit for constructing a transmission frame based on TPSs, pilot samples and data samples; and an IFFT unit for performing an inverse fast Fourier transform (IFFT) of the transmission frame to generate OFDM symbols; a guard interval inserting unit for inserting a guard interval between the OFDM symbols in order to eliminate an inter-symbol interference, thereby generating an OFDM frame; and an RF processing unit for performing a conversion of the OFDM frame into an analog radio frequency signal so that the OFDM signal can be transmitted in a specific frequency channel of an FM frequency band, and for amplifying and outputting the analog radio frequency signal, wherein the system concurrently supports both of coded-orthogonal frequency division multiplexing (COFDM) and Trellis COFDM (TCOFDM) transmission modes based on the same systematic parameters, and a conversion of the COFDM and the TCOFDM transmission modes is efficiently embodied by a change of an output data rate of an MPEG-2 multiplexer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An in-band adjacent-channel digital audio broadcasting system, comprising:
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a scrambling unit for scrambling a signal to be broadcasted, to generate a scrambled signal; an outer coding unit for performing a first encoding including a Reed-Solomon (RS) coding of the scrambled signal to generate an outer encoded signal; an outer interleaving unit for performing a first interleaving of the outer encoded signal on a byte by byte basis to generate an outer interleaved signal; an inner coding unit for performing a second encoding including a convolutional coding and a trellis coding of the outer interleaved signal to generate an inner encoded signal; an inner interleaving unit for performing a second interleaving of the inner encoded signal to generate an inner interleaved signal; a time interleaving structure capable of applying the same interleaving depth regardless of modulation (8PSK, 16QAM) and transmission type (COFDM, TCOFDM); a modulating unit for modulating the inner interleaved signal to generate orthogonal frequency division multiplexing (OFDM) symbols, the modulating unit including; a signal mapping unit for generating 8PSK or 16QAM data samples based on the inner interleaved signal; a frame adapting unit for constructing a transmission frame based on TPSs, pilot samples and data samples; and an IFFT unit for performing an inverse fast Fourier transform (IFFT) of the transmission frame to generate OFDM symbols; a guard interval inserting unit for inserting a guard interval between the OFDM symbols in order to eliminate an inter-symbol interference to generate an OFDM frame; and an RF processing unit for performing a conversion of the OFDM frame into an analog radio frequency signal so that the OFDM signal can be transmitted in a specific frequency channel of an FM frequency band, and for amplifying and outputting the analog radio frequency signal.
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Specification