Abstract: Techniques for data transmission using high-order modulation are provided. According to one aspect, parameters of a transmission link are determined, and a multilevel coding scheme and a high-order modulation signal constellation are selected on the basis of the determined parameters. An information indicating the selected multilevel coding scheme and high-order modulation signal constellation and data symbols encoded according to the selected multilevel coding scheme and high-order modulation signal constellation are transmitted. In other aspects, QPSK data symbols are embedded between M-QAM data symbols or M-PSK data symbols with M>4. The QPSK data symbols may be used to improve the efficiency of the decoding process.

Abstract: Techniques for data transmission using high-order modulation are provided. According to one aspect, parameters of a transmission link are determined, and a multilevel coding scheme and a high-order modulation signal constellation are selected on the basis of the determined parameters. An information indicating the selected multilevel coding scheme and high-order modulation signal constellation and data symbols encoded according to the selected multilevel coding scheme and high-order modulation signal constellation are transmitted. In other aspects, QPSK data symbols are embedded between M-QAM data symbols or M-PSK data symbols with M>4. The QPSK data symbols may be used to improve the efficiency of the decoding process.

Abstract: A coding method for modulating carrier signals with 16 different digital states (4 bit signals) possesses a high synchronicity robustness and an at least partially improved coding gain. The coding parameters are obtained by the following steps: a) using a 2 ASK/8 PSK coding; b) choosing a convolutional code and determining all possible code word sequences with the free distance of the convolutional code; c) producing possible mappings by allocating a partial quantity of the 2 ASK/8 PSK channel bits to subsets; d) choosing the mapping at which, after determination of the optimum radii of the two amplitudes for every possible mapping, the resulting minimum Euclidean distance takes a maximum value between two possible subset sequences code word sequence.

Abstract: The invention relates to a coding method for modulating carrier signals with 16 different digital states (4 bit signals). The aim of the invention is to obtain a high synchronicity robustness and an at least partially improved coding gain. The coding parameters are obtained by the following steps: a) using a 2ASK/8PSK coding; b) choosing a convolutional code and determining all possible code word sequences with the free distance of the convolutional code; c) producing possible mappings by allocating a partial quantity of the 2ASK/8PSK channel bits to subsets; d) choosing the mapping at which after determination of the optimum radii (ac,c) of the two amplitudes for every possible mapping, the resulting minimum Euclidean distance takes a maximum value between two possible subset sequences code word sequence.