VSB transmission system
First Claim
1. A method of processing a digital television (DTV) signal in a DTV receiver, the method comprising:
- receiving digital broadcast data, wherein the digital broadcast data result from encoding an input bit using a convolutional encoder to output first and second data bits, multiplexing the first and second data bits with ATSC data bits using a multiplexer to output third and fourth data bits, and encoding the third and fourth data bits using a TCM encoder to output fifth, sixth, and seventh data bits, wherein encoding the input bit using the convolutional encoder comprises;
pre-storing a first memory value in a first memory, the first memory value being a previous second data bit output from the convolutional encoder;
adding the input bit to the first memory value pre-stored in the first memory to obtain a second memory value; and
storing the second memory value in a second memory, wherein the first data bit is based on the input bit and the second data bit is the second memory value stored in the second memory;
performing TCM decoding on the received broadcast data at a rate of 2/3; and
decoding the TCM-decoded broadcast data at a rate of 1/2.
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Abstract
A vestigial sideband (VSB) modulation transmission system and a method for encoding an input signal in the system are disclosed. According to the present invention, the VSB transmission system includes a convolutional encoder for encoding an input signal, a trellis-coded modulation (TCM) encoder for encoding the convolutionally encoded signal, and a signal mapper mapping the trellis-coded signal to generate a corresponding output signal. Different types of the convolutional encoders are explored, and the experimental results showing the performances of the VSB systems incorporating each type of encoders reveals that a reliable data transmission can be achieved even at a lower input signal to noise ratio when a convolutional encoder is used as an error-correcting encoder in a VSB system.
83 Citations
4 Claims
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1. A method of processing a digital television (DTV) signal in a DTV receiver, the method comprising:
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receiving digital broadcast data, wherein the digital broadcast data result from encoding an input bit using a convolutional encoder to output first and second data bits, multiplexing the first and second data bits with ATSC data bits using a multiplexer to output third and fourth data bits, and encoding the third and fourth data bits using a TCM encoder to output fifth, sixth, and seventh data bits, wherein encoding the input bit using the convolutional encoder comprises; pre-storing a first memory value in a first memory, the first memory value being a previous second data bit output from the convolutional encoder; adding the input bit to the first memory value pre-stored in the first memory to obtain a second memory value; and storing the second memory value in a second memory, wherein the first data bit is based on the input bit and the second data bit is the second memory value stored in the second memory; performing TCM decoding on the received broadcast data at a rate of 2/3; and decoding the TCM-decoded broadcast data at a rate of 1/2. - View Dependent Claims (2)
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3. A digital television (DTV) receiver comprising:
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receiving means for receiving digital broadcast data, wherein the digital broadcast data result from encoding an input bit using a convolutional encoder to output first and second data bits, multiplexing the first and second data bits with ATSC data bits using a multiplexer to output third and fourth data bits, and encoding the third and fourth data bits using a TCM encoder to output fifth, sixth, and seventh data bits, wherein encoding the input bit using the convolutional encoder comprises; pre-storing a first memory value in a first memory, the first memory value being a previous second data bit output from the convolutional encoder; adding the input bit to the first memory value pre-stored in the first memory to obtain a second memory value; and storing the second memory value in a second memory, wherein the first data bit is based on the input bit and the second data bit is the second memory value stored in the second memory; a TCM decoder for performing TCM decoding on the received broadcast data at a rate of 2/3; and a decoder for decoding the TCM-decoded broadcast data at a rate of 1/2. - View Dependent Claims (4)
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Specification