Trellis coded QAM using rate compatible, punctured, convolutional codes
First Claim
1. A selective protection digital transmission system comprising a transmitter and a receiver, the transmitter including first convolutional coding means for coding data, second coding means for applying a coding by puncturing and means for allocating the coded data to digitally modulated symbols, characterized in that the first coding means provide a convolutional trellis coding having an N/2N rate, where N is an integer greater than 1, while the convolutional coding is combined with a 22N -state quadrature amplitude modulation and the puncturing coding is applied to the symbols.
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Abstract
A digital transmission system provides selective protection by combining a convolutional coding, a punctured coding and a digital quadrature amplitude modulation. The rate of the convolutional coding in N/2N and the modulation uses a 22N -point constellation, with N>1.
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Citations
16 Claims
- 1. A selective protection digital transmission system comprising a transmitter and a receiver, the transmitter including first convolutional coding means for coding data, second coding means for applying a coding by puncturing and means for allocating the coded data to digitally modulated symbols, characterized in that the first coding means provide a convolutional trellis coding having an N/2N rate, where N is an integer greater than 1, while the convolutional coding is combined with a 22N -state quadrature amplitude modulation and the puncturing coding is applied to the symbols.
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8. A selective protection method implemented in a digital transmission system, the method comprising the steps of:
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convolutional coding of input data into output data, puncturing of the convolutional coding by applying at least one puncturing matrix, allocating data to digitally modulated symbols, characterized in that the convolutional coding is a convolutional trellis coding having an N/2N rate, where N is an integer greater than 1, while the convolutional coding is combined with a 22N -state quadrature amplitude modulation and the puncturing coding is applied to the symbols. - View Dependent Claims (9)
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- 10. A transmitter for a digital transmission with selective protection, the transmitter comprising first convolutional coding means for coding data, second coding means for applying a puncturing coding and means for allocating the coded data to digitally modulated symbols, characterized in that the first coding means provide a convolutional trellis coding having an N/2N rate, where N is an integer greater than 1, while the convolutional coding is combined to a 22N -state quadrature amplitude modulation and the puncturing coding is applied to the symbols.
Specification