| 摘要 |
PURPOSE: To obtain an improved ability by mapping a data train on a signal point sequence deduced from the so-called sequence space of a usable sequence which is not a mere Cartesian product. CONSTITUTION: A digital data train is mapped on a signal point sequence for transmitting data by selecting a signal point sequence from a subset of all possible signal point sequences based on the digital data train. At the time of mapping, all possible signal point sequences in the subset exist in the basic area of trellis codes and the basic area is other than the simple Cartesian product of a finite dimensional area, In addition, the possible signal point sequence in the subset is a code sequence translated from a second code containing the trellis codes as sub-codes and the second code is of a trellis type or lattice type. Therefore, a larger total gain can be obtained with relatively low complexity. |
