Trellis coded QAM using rate compatible, punctured, convolutional codes
AssigneeU.S. Philips Corporation
InventorsAntoine Chouly, Americo Brajal, David Gianella
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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 2.sup.2N -point constellation, with N>1.
Claims16
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 2.sup.2N -state quadrature amplitude modulation and the puncturing coding is applied to the symbols.
A selective protection method implemented in a digital transmission system, the method comprising the steps of:
- 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 2.sup.2N -state quadrature amplitude modulation and the puncturing coding is applied to the symbols.
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 2.sup.2N -state quadrature amplitude modulation and the puncturing coding is applied to the symbols.
Dependencies are inferred from the claim text.